4500HD/4500XD/5500HD Series 4500HD/4500XD/5500HD Low Forward 5.2L Diesel Engine 5.2L Diesel Engine Forward Cab Low .com 2019

2019 Low Cab Forward 5.2L Diesel Engine 4500HD/4500XD/5500HD Series 84445126 A 19_CHEV_Low_Cab_Forward_5.2L_Diesel_Engine_4500HD_4500XD_5500HD_Series_COV_84445126A_2017DEC18.ai 1 12/14/2017 4:09:37 PM 4:09:37 12/14/2017 1 1 19_CHEV_Low_Cab_Forward_5.2L_Diesel_Engine_4500HD_4500XD_5500HD_Series_COV_84445126A_2017DEC18.ai 19_CHEV_Low_Cab_Forward_5.2L_Diesel_Engine_4500HD_4500XD_5500HD_Series_COV_84445126A_2017DEC18.ai PM 4:09:37 12/14/2017 K Y M C CY MY CM CMY Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Contents Introduction ...... 2 In Brief ...... 9 Keys, Doors, and Windows . . . . . 25 Seats and Restraints ...... 38 Storage ...... 54 Instruments and Controls ...... 64 Lighting ...... 92 Infotainment System ...... 97 Climate Controls ...... 131 Driving and Operating ...... 138 Care ...... 239 Service and Maintenance . . . . . 327 Technical Data ...... 353 Customer Information ...... 364 Reporting Safety Defects ...... 371 Index ...... 373 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

2 Introduction Introduction The following recommendations will help ensure the most enjoyable, safe, and trouble-free operation of your vehicle. When it comes to service, keep in mind that your commercial truck dealer knows your vehicle best and is interested in . 4500HD your complete satisfaction. Your dealer invites you to return for all of . 4500XD The names, logos, emblems, your service needs both during and . 5500HD slogans, vehicle model names, and after the warranty period. . 5500XD vehicle body designs appearing in Remember, if you have a concern this manual including, but not limited that has not been handled to your Crew Cab: to, GM, the GM logo, CHEVROLET, satisfaction, follow the steps in the and the CHEVROLET Emblem are separate Warranty and Owner trademarks and/or service marks of Assistance Information booklet. We LLC, its thank you for choosing our product, subsidiaries, affiliates, or licensors. and want to assure you of our continuing interest in your motoring This manual has been prepared to pleasure and satisfaction. acquaint you with the operation and maintenance of your vehicle, and to Model Reference . 4500HD provide important safety information. The models covered in this . 4500XD It includes a Maintenance Schedule manual are: and is supplemented with a . 5500HD Warranty and Owner Assistance Single Cab: . 5500XD Information booklet. We urge you to read these publications carefully. Litho in U.S.A. Part No. 84445126 A First Printing © 2017 General Motors LLC. All Rights Reserved. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Introduction 3 Using this Manual If any of these labels are peeling or Caution illegible due to wear or scratches, To quickly locate information about please contact your dealer for a the vehicle, use the Index in the Caution indicates a hazard that replacement. back of the manual. It is an could result in property or vehicle alphabetical list of what is in the damage. Some examples of warning/caution manual and the page number where labels are indicated on the following it can be found. pages, but there are many others not shown. Also, the contents of Danger, Warning, and these labels may vary from model to model. Caution The warning/caution labels shown Warning messages found on vehicle may be located differently in your labels and in this manual describe vehicle. hazards and what to do to avoid or A circle with a slash through it is a reduce them. Warning/Caution Labels safety symbol which means “Do Not,”“Do not do this,” or “Do not let Single cab model { Danger this happen.” Danger indicates a hazard with a Warning/Caution Labels in high level of risk which will result Your Vehicle in serious injury or death. The warning/caution labels in your vehicle indicate very important instructions and information that you { Warning should respect to ensure safe and proper use of the vehicle. Be sure to Warning indicates a hazard that read them before using the vehicle. could result in injury or death. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

4 Introduction

No. Description Crew cab model Automatic transmission fluid 2 level VIN, weight rating, and 3 Greenhouse Gas (GHG) emissions 4 NO STEP instruction 5 Certified clean idle label 6 Towing Vehicle noise emission 7 control information 8 ID plate 9 Engine cooling 10 Fan blade

No. Description 1 Cab tilt instruction Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Introduction 5

No. Description All models Vehicle noise emission 1 control information VIN, weight rating, and 2 Greenhouse Gas (GHG) emissions 3 NO STEP instruction 4 Engine oil level 5 Engine oil level notice 6 Certified clean idle label 7 Towing 8 Engine cooling 9 Fan blade Automatic transmission fluid 10 level 11 ID plate 12 Power steering fluid 13 Power steering fluid 14 Engine coolant level 15 Starting aids No. Description 1 Engine shutdown instruction Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

6 Introduction

No. Description Engine cover notice 2 (Crew cab) 3 Safety lock pin (Single cab) 4 Starting aids (Single cab)

No. Description 1 Safety Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Introduction 7

No. Description 2 V Diesel fuel 3 Radiator cap 4 Diesel exhaust fluid (DEF) 5 Body Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

8 Introduction 2 NOTES Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 9 Cruise Control ...... 22 In Brief Driver Information Center (DIC) ...... 23 Instrument Panel Power Outlets ...... 23 Instrument Panel ...... 10 Performance and Maintenance Instrument Panel Driving for Better Fuel (Driver Side) ...... 12 Economy ...... 24 Instrument Panel (Vehicle Diesel Exhaust Fluid ...... 24 Interior) ...... 13 Initial Drive Information Initial Drive Information ...... 14 Remote Keyless Entry (RKE) System ...... 14 Getting In and Out of the Vehicle ...... 14 Door Locks ...... 15 Windows ...... 16 Seat Adjustment ...... 17 Seat Belts ...... 18 Mirror Adjustment ...... 18 Steering Adjustment . . . . 18 Interior Lighting ...... 19 Exterior Lighting ...... 20 Windshield Wiper/Washer ...... 20 Climate Controls ...... 21 Vehicle Features Radio(s) ...... 22 Portable Audio Devices ...... 22 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

10 In Brief Instrument Panel Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 11 1. Air Flow Direction Control 9. Relay Box. See Electrical Lever. See Air Vents 0 134. System Overload 0 287. 2. Combination Light Control 10. Cupholders 0 56. Switch. See Exterior Lamp 0 11. Hook. See Shopping Bag Controls 92. Hooks 0 57. Cruise Control Set Switch/ 12. Card Holder. See Instrument Resume Switch. See Cruise Panel Storage 0 55. Control 0 223. 13. Accessory Power Outlet. See 3. Windshield Wiper and Power Outlets 0 67. Windshield Washer Switch. See Windshield Wiper/Washer 14. Accessory Power Outlet. See 0 66. Power Outlets 0 67. Exhaust Brake Switch. See Exhaust Brake 0 222. 4. Heater and Manual Air Conditioner. See Climate Control Systems 0 131. 5. Radio with CD/USB/Bluetooth. See AM-FM Radio 0 97. 6. Small Article Storage Pocket. See Instrument Panel Storage 0 55. 7. Windshield Washer Fluid Tank. See Washer Fluid 0 262. 8. Glove Compartment. See Glove Box 0 55. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

12 In Brief Instrument Panel (Driver Side) 7. Rear Power Window Lock Switch. See Power Windows 0 35. 8. Outside Rearview Mirror Heater Switch. See Heated Mirrors 0 34. 9. Cruise Control Main Switch. See Cruise Control 0 223. 10. Hazard Warning Flasher Switch. See Hazard Warning Flashers 0 94. 11. Rear Power Window Switch. See Power Windows 0 35. 12. Diesel Particulate Filter (DPF) Switch. See Diesel Particulate Filter 0 180. 13. Odometer Check Switch. See Odometer 0 70. 1. Instrument Panel Light Level 4. Rear Body Interior Light 0 Engine Oil Level Check Switch. Control. See Instrument Panel Switch. See Cargo Lamp 96. See Engine Oil 0 245. Illumination Control 0 95. 5. Instruments, Warning Lights 14. Door Lock Switch. See Power 2. Power Take Off (PTO) Main and Indicator Lights. See Door Locks 0 33. Switch. See Power Take-Off Instrument Cluster 0 69. 0 (PTO) 237. 6. Horn Button. See Horn 0 65. 3. Power Take Off (PTO) Engine Speed Control Switch. See Power Take-Off (PTO) 0 237. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 13 Instrument Panel (Vehicle Interior) 9. Selector Lever 0 214. 10. Fully Adjustable Steering. See Steering Wheel Adjustment 0 65.

1. Overhead Tray. See Storage 5. Seat Back Pocket (Driver’s Compartments 0 54. Side). See Storage 0 2. Sun Visor. See Sun Visors Compartments 54. 0 37. 6. Seat. See Seat Position 0 38. 3. Dome Lamps 0 96. 7. Cupholders 0 56. 4. Seat Belt. See Three-Point 8. Parking Brake Lever. See Seat Belt 0 45. Parking Brake 0 220. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

14 In Brief Initial Drive Remote Keyless Entry Locking (RKE) System Press the lock button (1) of the Information remote control unit for 1 second or This section provides a brief Unlocking and Locking the longer. The vehicle's keyless entry overview about some of the Doors system causes the right and left turn important features that may or may signal lights to simultaneously flash not be on your specific vehicle. once upon receiving the signals from the remote control unit. For more detailed information, refer to each of the features which can be See Remote Keyless Entry (RKE) found later in this owner’s manual. System Operation 0 26. Getting In and Out of the Vehicle Carefully check that the area around the vehicle is safe, hold the grip, and place your foot on the step when getting in or out of the vehicle. Unlocking See Getting In and Out of the Press the unlock button (2) of the Vehicle 0 29. remote control unit for 1 second or longer. The vehicle's keyless entry system causes the right and left turn signal lights to simultaneously flash twice upon receiving the signals from the remote control unit. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 15 Door Locks Locking the Door from Outside Locking and Unlocking the Door without Using the Key from Inside Locking and Unlocking the Door from Outside Using the Key

First, push the lock button (1) on the Push the lock button (1) forward to inside door handle forward and then lock the door; pull the lock button Turn the key toward the front of the close the door while keeping the backward to unlock it. After vehicle to lock the door and turn it outside door handle (2) raised. unlocking the door, open it by toward the rear of the vehicle to Before closing the door, be sure to pulling the inside door handle (2). unlock it. The doors can be opened If the door is locked, the lock by pulling the outside door handle. check that you have the key with you. mechanism overrides operation of the door handle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

16 In Brief Windows need to press the switch Window Switches on continuously (automatic mode Passenger’s Door Window Switches on operation). If you want to stop the The power window switch on the Driver’s Door automatic movement of the window before it lowers completely, raise the passenger's door can raise and switch lightly. lower the passenger's side window only and rear doors, if equipped. To Close the Driver s Window ’ The window continues to lower Lightly raising the driver-side while the window switch is being window switch will cause the pressed and continues to rise while driver's window to move up until the the switch is being raised. It will switch is released. stop moving at any position when the switch is released. To Open the Passenger’s Window The passenger's window continues to lower while the passenger-side switch on the driver's door is being pressed. The power window switch on the driver’s door can operate both To Close the Passenger’s Window driver’s (2) and passenger’s (1) The passenger's window continues power windows. to move up while the passenger-side switch on the To Open the Driver’s Window driver's door is being raised. Lightly pressing the driver-side window switch will lower the driver’s window until the switch is released (manual mode operation). When the switch is firmly pressed, the window will lower completely without the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 17 Seat Adjustment Reclining Adjustment Passenger’s Seat/Center Seat Driver’s Seat Forward/backward Adjustment

Passenger s Seat To recline the seatback, raise the ’ seatback tilt lever and gently lean back to the desired position. While raising the unlock lever, move To move the seatback forward, lean the seat forward or backward. forward with your back slightly clear Release the lever when the seat is of the seatback and raise the lever. in the desired position. After making After making adjustments, check adjustments, try to move the seat that the seatback is fully locked. back and forth to check that it is See Seat Position 0 38. fully locked. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

18 In Brief Seat Belts sides of the vehicle are provided. Make adjustments and clean mirrors if necessary. Outside Rearview Mirrors After properly adjusting your seat for proper driving position, adjust the mirrors so that they provide adequate views for checking the rear and the sides of the vehicle. Adjust the outside rearview mirrors by hand before vehicle operation. Center Seat This helps you determine the location of objects seen in the You can tip the seatback forward if mirror. If the outside mirror fogs up, you pull forward the lever at the side Refer to the following sections for warm up the outside rearview of the seatback. Normally, you important information on how to use mirror's face to defog. should keep the seatback in the seat belts properly: 0 raised position. See Mirrors 33. . Seat Belts 0 43 See Seat Position 0 38. . Three-Point Seat Belt 0 45 Steering Wheel . Child Restraint Systems 0 51 Adjustment Mirror Adjustment { Warning Sit in the correct driving position . Adjust the position of the with the seat adjusted properly. steering wheel before you Then, check each mirror to ensure start driving. that a proper view of the rear and (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 19 3. Firmly lock the steering wheel Warning (Continued) at the selected position by moving the lock lever to the . To reduce the risk of lock position. personal injury, apply force to the steering wheel to make certain the steering Interior Lighting column is firmly locked Front Light before driving. Also, do not try to tilt or adjust the steering wheel while the vehicle is moving. If these steps are not followed, the steering column could move The steering wheel is adjustable up suddenly while the vehicle and down as well as forward and is in motion which could backward. cause a temporary loss of Before adjusting, position the seat steering control which may as desired. result in personal injury or death. 1. Lift the lock lever toward you to unlock the steering column. 2. Sit in the correct driving The dome light operates regardless position, and then move the of the engine control switch position. steering wheel up and down The switch has three positions. and forward and backward to select the optimum steering ON : The light stays on regardless wheel position. of the doors being open or closed. OFF : The light stays off regardless of the doors being open or closed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

20 In Brief Between ON and OFF, the light Exterior Lighting ; : Turns on the parking lights comes on when the driver's door is including all exterior lights, except opened. the headlights. Rear Light (Crew Cab Model Only) 2 : Turns on the headlights together with the parking lights, sidemarker lights, roofmarker lights, taillights, license plate light, and instrument panel lights. . Exterior Lamp Controls 0 92. Windshield Wiper/Washer

Turning the light control switch to the following positions will cause the relevant lights to illuminate. The dome light operates regardless The light control switch can be used of the engine control switch position. when the engine control switch is The switch has three positions. placed in the LOCK or ACC ON : The light stays on regardless position. Do not operate the of the doors being open or closed. combination lights for an extended time period with the engine off. OFF : The light stays off regardless Otherwise, the battery may go dead, of the doors being open or closed. making it impossible to restart the To use the windshield wiper and Between ON and OFF, the light engine. washer switches, the engine control comes on when the driver's door is 9 : Turns off all exterior lights. switch must be in the ON position. opened. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 21 The windshield wiper switch has the Windshield washer fluid is sprayed 1. Outlet Selector Knob following positions, which over the windshield when this switch 2. Air Selector Lever correspond to the states of the is pressed. At the same time, the wiper. windshield wiper operates. 3. Temperature Control Knob 9 : Stopped. To spray washer fluid on the 4. Air Conditioning (A/C) Switch, if equipped 3 : Intermittent, light rain. windshield, push the button on the end of the combination switch lever. 5. Fan Speed Control Knob Low Speed : Low speed, The spray will continue as long as 0 moderate rain. you hold in the button. See Climate Control Systems 131. High Speed : High speed, See Windshield Wiper/Washer 0 66. heavy rain. Windshield Washer Climate Controls The heating, cooling, and ventilation for the vehicle can be controlled with this system.

Climate Control System w/Air Conditioning shown, Heater Only similar Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

22 In Brief Vehicle Features 2. Press Tune/Track y or z for Cruise Control less than one second again to Radio(s) select the station of your choice. Turning the Power On or Off Settings Press MODE/O /ENTER to turn the Adjustment of bass, treble, fader, power on. Press and hold it for and balance, and setting of clock one second or more to turn the display and time can be performed. power off. See “Function Setting Mode” in 0 If MODE/O /ENTER is pressed AM-FM Radio 97. while listening to music in audio CD Player mode, the power is turned off. When To play a CD, see CD Player 0 102. MODE/O /ENTER is pressed again, 1. Press the cruise control main the audio system resumes the last Portable Audio Devices mode just before it was turned off. switch to turn it on. This vehicle is equipped with a Adjusting the Volume 3.5 mm (1/8 in) auxiliary input jack Turn the MODE/O /ENTER knob and a USB port in the radio clockwise or counterclockwise to faceplate. External devices such as increase or decrease the volume. iPods, laptop computers, MP3 players, and USB storage devices Tuning may be connected. Manual tuning: See USB Port 0 109 and Auxiliary At this time, the cruise main Devices 0 117. indicator light comes on 1. Press Tune/Track y or z for simultaneously. less than one second. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

In Brief 23 Power Outlets

At the same time the cruise set indicator light comes on. See Cruise Control 0 223. Driver Information 2. Use the accelerator pedal to Center (DIC) adjust the vehicle to the The DIC display is in the instrument desired speed. Upon reaching cluster. It shows the status of many You can plug in auxiliary electrical the desired speed, turn the vehicle systems. equipment. Just flip the outlet cover cruise control set switch. The See Instrument Cluster 0 69 and open from the left edge of the cover vehicle speed at the moment and follow the proper installation you operate the switch is set in Driver Information Center (DIC) 0 82. instructions that are included with the system, enabling you to any electrical equipment you install. drive with the set speed These circuits are protected by a automatically maintained fuse and have maximum current without using the accelerator loads. pedal. See Power Outlets 0 67. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

24 In Brief Performance and Frequent short trips, excessive produced. The DEF system must be idling and use of the air conditioner maintained for the vehicle to run Maintenance in cool weather when "Vent" would properly. provide adequate comfort, can all DEF is not a fuel additive. For Driving for Better Fuel lead to decreased fuel economy. refilling instructions, see Diesel Economy Warming up the engine for longer Exhaust Fluid 0 189. DEF should than necessary, driving with the not be mixed with or added to diesel Economical Driving vehicle overloaded and revving the fuel. DEF freezes when exposed to How you drive, where you drive and engine are a waste of fuel. temperature below −11 °C (12 ° F). when you drive all affect fuel Overcooling of the engine not only Locating Diesel Exhaust Fluid economy. accelerates wear of the vital engine parts but also hurts fuel economy. DEF can be purchased at a dealer. For diesel , driving too fast, It can also be purchased at driving so slowly that the engine The careful attention you give your authorized vehicle and truck knocks, driving with the exhaust vehicle, as far as maintenance is dealerships. Additionally, some brake switched on all the time, and concerned, will also help fuel diesel truck fueling stations or frequently using the exhaust brake economy. retailers may have DEF for to adjust your speed can lead to Protection of Engine against purchase. See Recommended poor fuel economy. Fluids and Lubricants 0 349. Overcooling Drive at a constant speed as much When the remaining level of DEF as possible. When accelerating, Overcooling of the engine not only becomes excessively low the DEF increase your speed gently and accelerates wear of the vital engine gauge will change color from green slowly, and up-shift early. parts but also hurts fuel economy. to amber. In addition, warning and Maintain a constant cruising speed, indicator lights will come on and as traffic allows, and avoid sudden Diesel Exhaust Fluid engine power will be reduced so the stops. Diesel Exhaust Fluid (DEF) is used vehicle speed will not exceed with diesel engines to reduce the 89 km/h (55 MPH). See Diesel 0 amount of regulated emissions Exhaust Fluid 189. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 25 Keys and Locks Both sides of the key are identical, Keys, Doors, and so you can insert the key in the Windows engine control switch without Keys worrying about which way you insert it. Keys and Locks The key code is indicated on a Keys ...... 25 separate metal plate (3) in order to Remote Keyless Entry (RKE) prevent it from being acquired by an System ...... 26 unauthorized person. Remote Keyless Entry (RKE) System Operation ...... 26 Where is the Key Used? Getting In and Out of the Where For What Vehicle ...... 29 Door Locks ...... 30 Engine Control Starting and Power Door Locks ...... 33 Switch shutting down the engine Vehicle Security Vehicle Security ...... 33 Front doors Locking and 1. Main Key unlocking the Exterior Mirrors 2. Spare Key doors. Mirrors ...... 33 3. Metal plate with key code Heated Mirrors ...... 34 Wipe off the key to remove any dirt One key (1) can operate all the or dust, etc. before using it. Windows locks on the vehicle. Keep one of Power Windows ...... 35 the two keys provided as a To prevent theft, store the metal Sun Visors ...... 37 spare (2). Record the key code plate with key code in a safe place numbers. other than the vehicle. Should you lose the key, please give the key number to the nearest dealer. The dealer will be able to duplicate your key. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

26 Keys, Doors, and Windows If you resell the vehicle, be sure to Remote Keyless Entry Unlocking and Locking the hand over the plate with key code to Doors the new owner together with the (RKE) System Operation vehicle. The keyless entry system allows you to lock/unlock the doors by Remote Keyless Entry simply pressing the remote control (RKE) System button rather than inserting the key into the lock. See Radio Frequency Statement 0 370. If there is a decrease in the Remote Keyless Entry (RKE) operating range: . Check the distance. The transmitter may be too far from Remote Control Unit the vehicle. Unlocking . Check the location. Other vehicles or objects may be Press the unlock button (2) of the blocking the signal. remote control unit for 1 second or longer. The vehicle's keyless entry . Check the transmitter's battery. system causes the right and left turn See “Replacing the Battery in The remote control unit works within signal lights to simultaneously flash the Remote Control Unit” later in a 10 m (33 ft) radius of the cab twice upon receiving the signals this section. center as indicated in the figure. from the remote control unit. The actual distance over which the . If the transmitter is still not Locking working correctly, see your unit operates may vary depending dealer or a qualified technician on conditions. Press the lock button (1) of the for service. remote control unit for 1 second or longer. The vehicle's keyless entry Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 27 system causes the right and left turn The lock or unlock buttons on the Replacing the Battery in the signal lights to simultaneously flash remote control unit must be fully Remote Control Unit once upon receiving the signals pressed for more than 1 second from the remote control unit. to work. When the battery runs down, replace it. Battery life is Should you lose the remote control If you do not open any doors within approximately two years. unit, please contact your dealer. about 30 seconds after pressing the Number of unlock button to unlock the doors, Battery Used After locking the doors using the Battery remote control unit, be sure to the automatic locking function of the check that they are locked by system will lock the doors again to Lithium battery 1 prevent theft. pulling the door handles. Model number: Avoid getting water on the remote In areas near a TV tower, electric CR 2032 power plant, radio station, etc. or control unit, dropping it, hitting it Voltage: DC3V against another object, or stepping under any conditions involving on it; otherwise, the remote control strong electrical disturbances, the unit could malfunction. remote control unit operating range might change or the keyless entry Do not leave the remote control unit system might not work. on the dashboard or any other surface where the unit might be The keyless entry system does not exposed to high temperatures operate in the following cases: (exceeding 60°C/140°F). Doing so . The engine control switch is in may result in shorter battery life or the "ON" position. malfunction of the remote . The key is inserted in the engine control unit. control switch. If the keyless entry system fails to . One of the doors is open. operate normally, lock and unlock the doors using the key and have the system inspected by your 1. Battery Cover dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

28 Keys, Doors, and Windows 2. Remote Control Cover 3. Insert a flat head screwdriver Notch or similar tool into the recess of 3. Remote Control Unit Cover the remote control unit (4) to 4. Remote Control Unit remove the old battery. 5. Battery 4. Insert the new battery into the remote control unit (4) with its positive side visible, and press the battery downward until fully seated. 5. Install the remote control unit (4), battery (5), and battery cover (1) in their original 2. Remove the battery cover (1). positions inside the remote control unit cover (3). 6. Close the remote control unit cover (3). When closing the remote control 1. Pry open the remote control unit cover (3), check that there is no unit cover (3) by inserting a flat dust, hair, or anything else caught head screwdriver or similar tool underneath it. A poorly sealed into the notch of the remote remote control unit could become control unit cover (2). Wrap a deteriorated. piece of cloth or tape around Please comply with the collection the tip of the screwdriver so as system available in your country for not to damage the remote the disposal of old batteries. In control unit cover (3). addition, take special care to prevent any danger to children. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 29 Getting In and Out of the { Warning Warning (Continued) Vehicle When changing the battery, use at 3 points. It is very dangerous to only a battery of the same type as stand on the tire or wheel when the original battery, or an getting in or out of the vehicle. equivalent. Otherwise, there is a Furthermore, do not try to jump in risk of explosion. or out of the vehicle, as doing so Do not place the battery in direct could cause unexpected sunlight, or near a fire or other accidents or injuries. sources of heat. Getting in or out of the vehicle Be sure to install the battery with with oily or greasy hands or the "+" and "-" sides correctly shoes could cause you to slip. oriented. Incorrect installation will Always thoroughly clean grease, result in leakage of chemicals etc. from your hands and shoes from inside the battery or other Carefully check that the area around before getting in or out of the operational problems. the vehicle is safe, hold the grip (1), vehicle. You and others could be seriously and place your foot on the step (2) Rain and snow can cause the injured. when getting in or out of the vehicle. step to become very slippery. Therefore, always remove snow { Warning The battery life varies depending on and ice from your shoes and the step, and be careful not to slip how the remote control unit is used. When getting in or out of the when getting in and out of the vehicle, make sure you use the The battery has reached its end of vehicle. life when the remote control unit step and grips to support yourself (Continued) works intermittently or does not (Continued) work at all. Replace the battery as soon as this happens. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

30 Keys, Doors, and Windows

Warning (Continued) Warning (Continued) Warning (Continued)

Exercise caution when opening or When you close the door after belts properly, locking the doors closing doors, as strong winds or sitting behind the wheel, check helps prevent people from being steep slopes may cause doors to that the door is fully closed. thrown from the vehicle. It also open or close suddenly. Driving with any door ajar is very helps prevent unintended opening Do not hold parts other than the dangerous. of the doors and helps keep out grip when getting in or out of the Before opening the door when intruders. vehicle. Doing so may cause climbing into or out of the cab, You and others could be seriously damage to the vehicle or injuries carefully check all areas around injured. to yourself or others. the vehicle for safety, especially You and others could be seriously the area at the rear of the vehicle. injured. If you suddenly open a door without checking the surrounding { Warning area, the door could be hit by a To protect the child from the Door Locks vehicle behind you or a danger of getting his/her hands pedestrian. and head trapped, an adult must { Warning Never leave the key in the open, close and lock the door for vehicle. the child. Be sure to do the following whenever you leave the vehicle: Tilt the cab only after fully closing Be careful that the child does not the doors. interfere with the power window 1. Fully engage the parking switches and get his/her hands or To help reduce the risk of brake. head trapped in the window. personal injury in an accident, 2. Stop the engine. While a child is in the cab, be always lock the doors when 3. Lock the doors. driving. Along with using the seat (Continued) (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 31 Front Doors Locking the Door from Outside Warning (Continued) without Using the Key Locking and Unlocking the Door sure to control the power windows from Outside Using the Key using the power window switches beside the driver's seat. You and others could be seriously injured.

Overriding door locks are a standard safety feature. When the doors are locked, the inside handles will not open them. This is to prevent accidental opening of the doors. First, push the lock button (1) on the inside door handle forward and then Turn the key toward the front of the close the door while keeping the vehicle to lock the door and turn it outside door handle (2) raised. toward the rear of the vehicle to unlock it. The doors can be opened Before closing the door, be sure to by pulling the outside door handle. check that you have the key with you. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

32 Keys, Doors, and Windows Locking and Unlocking the Door panel. To open the door from Locking and Unlocking Doors from Inside outside the vehicle, pull up on the from the Inside handle. Locking the Door from the Outside Push the door lock button forward and then close the door; the door will be locked. Inside Door Handles An inside handle for opening each cab door is located in the recessed area at the front of the door. To open the door, pull on the handle. If the door is locked, the lock Push the lock button (1) forward to mechanism overrides operation of Push the door lock button (1) lock the door; pull the lock button the door handle. The door must first forward to lock the door and pull the backward to unlock it. After be unlocked before the handle can lock button backward to unlock it. unlocking the door, open it by be used to open the door. pulling the inside door handle (2). If the door is locked, the lock mechanism overrides operation of the door handle. Rear Doors Outside Door Handles A handle for opening each cab door from outside the cab is located at the rear edge of the door's outer Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 33 Power Door Locks Vehicle Security Exterior Mirrors Power Door Lock (Central Guard Against Theft Door Lock) Mirrors Your new vehicle has many features Sit in the correct driving position How the Power Door Lock System to help prevent theft of the vehicle, with the seat adjusted properly. Operates its equipment and contents. But Then, check each mirror to ensure When you lock the driver's door these anti-theft features depend upon you to work. that a proper view of the rear and using the key or by operating the sides of the vehicle are provided. lock button, the power door lock The time to be most on guard is Make adjustments and clean mirrors system will automatically lock all when leaving the vehicle: if necessary. doors simultaneously. . Park in a lighted spot when Outside Rearview Mirrors Door Lock Switch you can. After properly adjusting your seat for . Turn the engine control switch to proper driving position, adjust the "LOCK" and remove the key. mirrors so that they provide This locks the switch and the adequate views for checking the steering controls. The selector rear and the sides of the vehicle. lever is not locked. Adjust the outside rearview mirrors . Keep items that may appear to by hand before vehicle operation. be of value out of sight and This helps you determine the locked up when possible. location of objects seen in the mirror. If the outside mirror fogs up, . Fully close all windows and lock warm up the outside rearview all doors. mirror's face to defog. See Heated Mirrors 0 34. Both doors can be locked and unlocked by pressing the power door lock switch. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

34 Keys, Doors, and Windows If the outside rearview mirrors fog { Warning Warning (Continued) up, press the outside rearview mirror heater switch to defog them. Before driving, be sure to adjust Keep the mirrors in mind when When the switch is pressed the the seat and mirrors to positions passing another vehicle on a indicating light will illuminate. If the that give you a correct driving narrow road, moving the vehicle switch is pressed once again, it will posture. into a garage, or driving near switch to “OFF,” and the operation Do not adjust the outside mirrors pedestrians. indicating light will go out. while operating the vehicle. Do not drive with the mirrors Do not use this switch while the Adjust the mirrors when the folded. engine is shut down. Due to high vehicle is stationary, not while the You and others could be seriously power consumption, the battery can vehicle is in motion. injured. be discharged. When checking the rear of the Turn off the switch as soon as vehicle with mirrors, be careful defogging is complete. that this does not distract your Heated Mirrors attention from the traffic ahead. Outside mirrors may make the vehicle behind you appear farther away than it really is. Use these mirrors very carefully until you are able to correctly determine distances from the images. (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 35 Window Switches on Windows { Warning Driver’s Door Power Windows Regardless of whether the vehicle is moving or stationary, you must { Warning never allow a child to put his/her head, hands, or other body part If you are traveling with a child, out of the window. Allowing such do not leave the child alone in the behavior would be dangerous vehicle. If the child touches the because the child could hit an controls or equipment, an obstacle. accident could occur. (For You and others could be seriously example, the vehicle could move injured. or a fire could start.) Also, the cab inside could become dangerously hot in hot weather. The power windows operate only when the engine control switch is in The power window switch on the the ON position. Open each door driver’s door can operate both window by pressing the power driver’s (2) and passenger’s (1) { Warning window switch; close each one by power windows. raising the switch. Before closing the windows, make To Open the Driver’s Window sure that there is no risk of a Lightly pressing the driver-side hand, head, or anything else window switch will lower the driver’s being trapped in the moving window until the switch is released window. (manual mode operation). When the switch is firmly pressed, the window You and others could be seriously will lower completely without the injured. need to press the switch continuously (automatic mode Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

36 Keys, Doors, and Windows operation). If you want to stop the only, while, if equipped, the rear Window Switches on Center of automatic movement of the window power window switches can raise Dashboard (Crew Cab Model) before it lowers completely, raise the and lower the rear door windows. switch lightly. The power window switch on the instrument panel and rear door can To Close the Driver’s Window { Warning raise and lower the rear door window. Lightly raising the driver-side Be sure to warn passengers not window switch will cause the to let any part of the body To Open a Rear Window driver's window to move up until the become trapped or caught in a switch is released. moving window. To Open the Passenger’s Window You and others could be seriously The passenger's window continues injured. to lower while the passenger-side switch on the driver's door is being The window continues to lower pressed. while the window switch is being To Close the Passenger’s Window pressed and continues to rise while the switch is being raised. It will The passenger's window continues stop moving at any position when to move up while the the switch is released. passenger-side switch on the driver's door is being raised. When the rear power window lock Rear Power Window Switch switch is in the “LOCK” position, it is Window Switches on not possible to open and close the The window glass will move downward while you are pushing Passenger’s Door and Rear rear windows. Doors (If equipped) the bottom part of the switch. The power window switch on the To Close a Rear Window passenger's door can raise and The window glass will move upward lower the passenger's side window while you are pushing the top part of the switch. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Keys, Doors, and Windows 37 To Lock Rear Power Windows Sun Visors

Passenger’s Side Rear Power Window Lock Switch Driver’s Side The sun visor (1) protects your eyes If you push the rear power window in strong sunlight. Use it when lock switch, only the driver's window sunlight is too bright. To reduce side and front passenger's window will glare, unhook (2) the sun visor (1) open. To cancel the rear power and swing it around to the side. window lock, push the switch again. Make sure to fold up the sun visor Use the rear power window lock after use. switch to "LOCK" the rear power windows. By doing so, you can prevent passengers from operating the rear power windows. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

38 Seats and Restraints

Seats and Front Seats { Warning Restraints Seat Position Adjust the seat only before you start driving. Adjusting the seat while the vehicle is in motion Front Seats { Warning must be avoided not only Seat Position ...... 38 Use caution when adjusting the because the unlocked seat will Rear Seats seat, as failure to do so could move back and forth unstably, Rear Seats (Crew cause injury. You and others preventing you from taking the Cab Only) ...... 42 could be seriously injured. correct position, but might also cause you to lose control of the Seat Belts vehicle, possibly resulting in an Seat Belts ...... 43 accident. You and others could be Three-Point Seat Belt ...... 45 { Warning Seat Belt Use During seriously injured. Pregnancy ...... 47 Never allow children to adjust Lap Belt ...... 48 their seats themselves; an adult Seat Belt Extender ...... 49 should adjust the seat for { Warning Safety System Check ...... 49 occupants who are children. You Seat Belt Care ...... 49 and others could be seriously Try to move the seat without Child Restraints injured. unlatching it after making Child Restraint Systems ...... 51 adjustments to check that it is completely locked. A loosely locked seat may move unexpectedly and your position might then become unstable; this could lead to an accident. Take (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 39

Warning (Continued) { Warning { Warning

the vehicle to your dealer for Do not place a cushion or similar Before making adjustments, service if you find that your seat object between your back and the check that the seat rails are free adjusters do not latch. In addition, seatback. Doing so not only of anything that could obstruct the the seat belt will not operate affects the stability of your driving locking of the seat. Be careful that properly if the seatback is not position but also prevents the your hand or foot does not completely locked. You and seat belt from working effectively become trapped in the seat or others could be seriously injured. in the event of a collision. You rails when adjusting the seat. You and others could be seriously and others could be seriously injured. injured. { Warning

Driving with the seat excessively { Warning { Warning reclined could be very dangerous in the event of a collision or Do not place any objects under When adjusting the seat, be sudden stop. Raise the seatback, the seat. If there are any objects careful that the seat does not hit and apply the seat belt correctly under the seat, the seat could be passengers or objects. Doing so while sitting straight in the seat. locked in an improper position. could cause injury to passengers, You and others could be seriously You and others could be seriously or damage objects. You and injured. injured. others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

40 Seats and Restraints Adjusting the seat for a correct Reclining Adjustment { Warning driving posture is a fundamental part of safe driving. Make sure not to hit passengers { Warning Forward/backward Adjustment or luggage when adjusting your To reduce the risk of sliding under seat. You and others could be the lap belt during a collision, an seriously injured. occupied reclining seat should not be reclined any more than needed for comfort. The seatback { Warning and seat belts provide best restraint only when the rider is When adjusting the seat, or when sitting well back and straight up in getting up from the seat, do not the seat. (The lap belt is designed put your hand or other objects to spread the force of a collision under the seat or near moving over the hipbone. If you are parts. Doing so could cause injury reclined, the lap belt may slide or damage to objects. past your hips and apply restraint While raising the unlock lever, move forces directly to the abdomen. Therefore, in the event of a Driver’s Seat the seat forward or backward. Release the lever when the seat is collision, the risk of personal The driver's seat must be adjusted in the desired position. After making injury will increase with increasing so that when you sit well back in the adjustments, try to move the seat recline of the seatback). You and seat, you can fully press the pedals back and forth to check that it is others could be seriously injured. without moving your back from the fully locked. seatback, and you can operate the steering wheel easily and freely. After making adjustments, check that the seat is completely locked. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 41 To move the seatback forward, lean the scale and counterclockwise to { Warning forward with your back slightly clear move it up the scale. The pointer of the seatback and raise the lever. should be alongside your weight on Do not adjust the reclining After making adjustments, check the scale. seatback on the driver's seat that the seatback is fully locked. while the vehicle is moving. The The range of adjustment is seatback could jerk and cause a Suspension Adjustment 50-130 kg (110-290 lbs). If your weight is outside this range, the loss of control. You and others Avoid making any kind of contact could be seriously injured. suspension may not be fully with the pointer on the scale. Doing effective. However, you will be able so may result in damage to the to sit in the correct position for pointer, preventing appropriate driving. weight adjustments from being possible. Passenger’s Seat/Center Seat

{ Warning

Baggage must not be placed on the center seat. If the baggage falls on the floor when braking, it may prevent the driver from operating the pedals. You and others could be seriously injured.

To recline the seatback, raise the seatback tilt lever and gently lean back to the desired position. Before sitting on the seat, use the knob to adjust the suspension to suit your weight. Turn the knob clockwise to move the pointer down Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

42 Seats and Restraints Rear Seats Rear Seats (Crew Cab Only) Do not remove the seat cushion except when taking out or stowing onboard tools.

{ Warning

Do not drive with the seat cushion Passenger’s Seat Center Seat removed. The seat would not be You can tip the seatback forward if stable, which could lead to an you pull forward the lever at the side accident. You and others could be of the seatback. Normally, you seriously injured. should keep the seatback in the raised position. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 43 Seat Belts Familiarizing yourself with the correct use of seat belts is essential for your safety.

{ Warning

To help reduce the risk of personal injury in collisions or sudden maneuvers, use the seat belts following these instructions on their proper use, maintenance, and use with child restraint The rear seat headrests are not systems. adjustable. Seat belts must always be Do not use the rear seats with the The protection provided by seat fastened BEFORE starting to headrests removed during driving. belts might be significantly reduced drive. if they are not fastened properly; in Seat belts provide full protection certain cases, improperly fastened only when the driver and seat belts can even play a role in passenger(s) fasten them while causing injury to the wearer. Seat sitting upright and fully back on belts must be worn not only by the the seat. driver but also by the passenger(s) before the vehicle starts moving. Wearing a seat belt with the You should be fully acquainted with seatback excessively reclined the proper use of seat belts and could be very dangerous in a important points to be respected as collision or sudden stop since the described in the following pages. occupant may slide under the belt (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

44 Seats and Restraints

Warning (Continued) Warning (Continued) Warning (Continued)

and be seriously injured. Seat do not use a seat belt if it does disperse shocks efficiently in the belts work best only when the not fit snugly over the child's hips event of a collision or occupant is sitting well back and because restraining the child sudden stop. straight up in the seat. under those conditions could be Too much slack could increase Be sure to insert the latch plate dangerous in the event of a the amount of injury because the into the buckle until a click is collision or sudden stop. Instead, belt would not be able to properly heard. An incompletely inserted use an appropriate child restraint restrain you in an accident. latch plate is dangerous in the system available on the market. For further details, please contact Do not put the lap portion of a event of a collision or seat belt over any armrest. sudden stop. your dealer. Use a child restraint system that Do not wear a shoulder belt under Do not run the seat belt over your your arm nearest the door. face, chin or neck. fits the size of the infant or child. Install the system according to Do not let a buckle release button Wear the seat belt as low as the manufacturer's instructions. face downward or inward. possible around the hips, not around the waist. A seat belt Children who have outgrown child Expectant mothers or people running over the waist would restraint systems should use the suffering from chest or abdominal press the abdomen with a strong vehicle's seat belts. conditions should check with their force and could increase the Remove any twists in the seat doctor for specific likelihood of injuries in a collision belt before fastening it. A seat recommendations about wearing or sudden stop. belt with twists will not provide full seat belts. Do not use a seat belt for a small protection because it cannot (Continued) child if the belt is on or very close (Continued) to the child's neck or chin. Also, (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 45

Warning (Continued) Warning (Continued) Warning (Continued)

Do not use one seat belt for more Be careful to keep the buckles Wearing seat belts is a legal than one person. If worn by more and retractors free of dust and requirement. All other passengers than one person, the seat belt foreign matter. (This may jam the must wear seat belts. The driver would not work effectively in a retractor or damage the belt.) is responsible not only for collision or sudden stop. Do not let the belt system wearing a seat belt himself/herself Have seat belts inspected and, become damaged by the door but also for prompting all if necessary, replaced by the or seat. passengers to wear their seat nearest dealer when the webbing belts. It is necessary, however, to Do not let the belt twist while it is check with a doctor about the becomes frayed or worn and/or rewinding: it may cause the when the buckle or other appropriateness of a seat belt for retractor to jam so it will not an expectant mother or a mechanical parts fail to work rewind further. If it is not fully properly. passenger with a chest/abdominal rewound, the belt cannot be condition. If your vehicle has been involved pulled out. Should the belt jam, in a collision, the seat belts worn you may be able to release it by at the time may have lost their working the belt in and out until Three-Point Seat Belt original strength due to impact the belt rewinds far enough to even if they appear intact. These unlock. However, if the belt { Warning seat belts must be inspected and, remains jammed or other parts of if necessary, replaced by the the restraint system do not work The shoulder belt should be nearest dealer. properly, have your dealer adequately positioned on your shoulder but should not touch (Continued) service it. your neck and/or face. The (Continued) shoulder belt could harm you in a (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

46 Seats and Restraints To Fasten: Warning (Continued) 1. Sit on the seat in the correct collision or sudden stop if it is in driving position. contact with your neck and/ or face.

3. To reduce the risk of sliding under the belt during a collision, position the belt across your lap as low on your 2. Pull out the seat belt holding hips as possible and adjust it to a snug fit by pulling the the latch plate. After checking "shoulder" portion upward that there are no twists in the through the latch plate. Every seat except the center seat belt, insert the latch plate into on your vehicle is equipped with a the buckle until it clicks. If the The lap-shoulder belt is three-point seat belt. The seat belt retractor locks before the latch designed to lock during a extends or retracts freely if the plate reaches the buckle, let sudden stop or impact. At other wearer moves slowly, but it locks the belt retract slightly, then times it should move freely. and restrains the occupant during withdraw it slower than before. forward force caused by the occupant's body following a strong shock. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 47 To Unfasten: When the passenger's seat belt is Seat Belt Use During fully taken up (or not pulled out), check that the stopper is holding the Pregnancy belt in a fully taut state. { Warning Emergency Locking Retractor (ELR) Function Unless the seat belt is correctly The three-point seat belts are worn, it may dig into the abdomen provided with an Emergency in the event of hard braking or a Locking Retractor (ELR) function. collision, harming not only the expectant mother but also the The ELR normally allows the seat belt to move in and out freely as the unborn child, putting them both in occupant moves. However, it locks danger of serious injuries or the seat belt to restrain the death. Push the button on the buckle. As occupant when a forward force the belt automatically retracts, let it resulting from a collision or sudden be taken up slowly by holding on to stop acts on the occupant. the latch plate until the belt is fully The ELR also locks the seat belt retracted. when the belt is pulled out quickly. While being automatically retracted, If this happens, allow it to retract the seat belt could damage a once and then pull it out slowly. nearby window or interior trim unless the latch plate is properly held. Hold the latch plate to ensure that the belt is taken up slowly. Before closing the door, check that the retracted seat belt is taut. A slack belt could become trapped in the door or seat rail. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

48 Seats and Restraints An expectant mother or a person who is ill riding in the vehicle must also wear a seat belt. In light of the risk that the seat belt will apply pressure to the abdomen, chest and shoulders in the event of a collision, however, an expectant mother or person who is ill should get advice from a physician beforehand. . An expectant mother should use a three-point seat belt. . An expectant mother should position the lap belt snugly as 2. Pull out the latch plate side of 3. After checking that there are no low as possible on the hips (not the belt a little longer than twists in the belt, insert the across the abdomen). Also, she necessary. Placing the latch latch plate into the buckle until should fasten the shoulder belt plate at right angles with the it clicks. so it rests on her chest, not on belt makes this easier. her abdomen. Lap Belt The center seat lap belt has no retractor, but should be positioned, worn, and released as described below. To Fasten: 1. Sit on the seat in the correct position. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 49 4. Position the seat belt across Seat Belt Extender replaced and anchorages properly the lap as low as possible on repaired if they were in areas the hips. Pull the fold-back end If the vehicle's seat belt will fasten damaged by a collision, whether the of the belt (upper side) until the around you, you should use it. But if belt was in use or not. If there is any belt is adjusted to a snug fit. a seat belt isn't long enough to question, replace the belt system. fasten, your dealer can order you an To Unfasten: Damage, whether visible or not, extender. When you go in to order it, could result in a serious personal take the heaviest coat you will wear, injury in the event of an accident. so the extender will be long enough for you. The extender will be just for Seat Belt Care you, and just for the seat in your vehicle that you choose. Do not let someone else use it, and use it only { Warning for the seat it is made to fit. To wear it, just attach it to the regular Keep belts clean and dry. seat belt. Clean seat belts only with mild soaps and lukewarm water. Safety System Check Do not bleach or dye belts since Now and then check that the belts, this may severely weaken them. buckles, latch plates, retractors, Seat belt webbing can lose its Push the button on the buckle to anchorages and guide loops work strength when bleached or unfasten the belt. properly; look for loose parts or redyed, or when cleaned using The center seat belt damage (without disassembly) that gasoline, paint thinners or other (length-adjustable two-point belt) is could keep the restraint system from designed so that it cannot be doing its job. Have a belt assembly volatile substances. connected with any of the replaced if the webbing has been Do not disassemble the seat belt windowside seat belts (three-point cut or otherwise damaged. Replace mechanism in order to remove seat belts with ELR). belts, retractors, and hardware used any foreign material or objects in all but a minor collision. Also, restraint systems should be (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

50 Seats and Restraints 1. Seat belt fold-back fitting Avoid using anything like a tool to Warning (Continued) portion pass the cloth through the fold-back 2. Seat belt fitting portion or try to remove that may have entered the buckle. 3. Cloth stubborn dirt. Using such an object Instead, arrange for inspection can result in plastic parts or seat and maintenance to be carried Cleaning a Seat Belt Fold-Back belt webbing damage. out by your dealer. You and Fitting Portion: others could be seriously injured. 1. Fold a piece of cotton cloth, Cleaning a Belt Webbing absorbent gauze, or the like of A dirty seat belt can develop approximately 50 mm (2 in) in retracting problems, and for this width into a rectangle. reason, regular inspection and 2. Mix one part neutral detergent upkeep are required. into approximately twenty parts Cleaning a Seat Belt Fold-Back warm water. Fitting Portion 3. Wet the cloth in the detergent mixture, pass it through the fold-back fitting portion of the belt, and slide it back and forth and laterally until dirt can no longer be seen. 4. Remove the cloth, remove 1. Brush moisture from the fitting portion 2. Seat belt of the belt using a dry cloth, and then allow it to dry Cleaning a Belt Webbing: naturally out of direct sunlight. 1. Fully extract the belt and 5. Check to be sure the seat belt examine for any difference in retracts and pulls out correctly. color between the front and back surfaces. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 51 2. Mix one part neutral detergent If the above-described upkeep Child Restraints into approximately twenty parts operations do not improve the warm water. operation of the seat belt through Child Restraint Systems 3. Wet a nail brush or another the retractor, there is a possibility similar brush having soft that the belt is making contact with bristles (of nylon or the like) in the door pillar trim. In this case, { Warning arrange for inspection and warm water, and use this to Children small enough for child clean away dirt. maintenance to be carried out by your dealer. restraints (as indicated on the 4. Wipe the seat belt dry using a label of such restraints), including If the belt is not winding and dry cloth, and then allow it to booster seats, should always be unwinding correctly, or if inspection dry naturally out of direct transported in them. Children who sunlight. reveals problems such as loose mountings, metal parts deformation, have outgrown child restraint 5. Check to be sure the seat belt webbing damage, fraying or systems should wear seat belts. retracts and pulls out correctly. discoloration, arrange for The lap belt should be snug and replacement to be carried out by positioned low on the abdomen your dealer. so that it is below the top of the hipbone. Otherwise, the belt could intrude into the child's abdomen during an accident and cause personal injury. When a child has grown enough so that the shoulder belt can be worn, a seating position with a shoulder belt should be chosen whenever possible. (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

52 Seats and Restraints the child restraint is not properly Installation on Outboard Seat Warning (Continued) secured, the child risks personal injury in the event of a collision. Any unrestrained child could be injured by striking the vehicle's Using a Lap Belt That Has No interior or by ejection from the Retractor vehicle during an accident or When securing a child restraint with driving maneuver. Never allow a the center seat lap belt, pull the child to be held by another excess webbing through the belt's occupant instead of being adjustment feature, then take these properly restrained. If not properly steps: restrained, the child could strike the vehicle interior or be crushed . Once installed, push and pull the child restraint in all directions to by the person holding the child, be sure it is secure. If it comes or by other occupants. loose, flip the end of the belt A seat belt locking clip is required with the adjustment feature over for installation of a child restraint Be sure to follow all installation and before rebuckling. system on the outboard seat of this use instructions that come with any . If the child restraint is still not vehicle. A locking clip may usually child restraint system. secure, use the outboard seating be obtained where child restraints Child restraint systems are designed position in the vehicle and are sold, or by contacting your to be secured in vehicle seats either contact your dealer and the child dealer for assistance. Make sure the by the lap belt, or the lap portion of restraint manufacturer for help. locking clip is identical to the one shown on this page. Until you have the lap-shoulder belt at that seating . Secure the child in the restraint position. The child must also be the clip, use the child restraint in accordance with the child system only in the center seat. secured within the restraint by the restraint manufacturer's means provided by the child instructions. restraint manufacturer. If the child or Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Seats and Restraints 53 Secure the child restraint with the When your child restraint is not { Warning lap belt portion (1) of the seat belt in installed, remove the locking clip to accordance with the restraint permit normal use of the To help avoid personal injury or manufacturer's instructions. Then lap-shoulder belt. Keep the locking death during a collision or sudden thread both the lap (1) and shoulder clip in the glove box to help prevent maneuver, always thread both the belt (2) portions through the locking its loss. lap and shoulder belt through the clip. Push and pull the child restraint locking clip when securing a child in all directions to be sure it is Child Restraint with Top Tether restraint on the outboard seat. secure. If the clip is not used or installed { Warning properly, the child restraint may move or tip over when your We do not recommend using a vehicle turns or stops abruptly. child restraint that requires the use of a top tether. There is no appropriate place to attach a top tether anchor behind the seat in this vehicle.

Locking Clip Attached to Seat Belt – Side View 1. Lap Belt 2. Shoulder Belt 3. Locking Clip Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

54 Storage Storage Storage Seat Back Pocket Compartments Storage Compartments Overhead Compartment Storage Compartments ...... 54 Instrument Panel Storage ...... 55 { Warning Glove Box ...... 55 Cupholders ...... 56 Do not use the overhead Rear Storage ...... 57 compartment to hold an object Additional Storage Features weighing more than 2 kg (4 lb) or Shopping Bag Hooks ...... 57 an object that may fly out or fall down during vehicle operation. Information on Loading the Doing so would be dangerous. Vehicle Items may fly out or fall down Information on Loading the when the cab is lowered after Use the seat back pocket for storing items such as vehicle registration Vehicle ...... 58 being tilted. documents or owner manuals. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Storage 55 Instrument Panel Storage Card Holder Glove Box Small Article Storage Pockets

Use this to hold your cards.

Use the storage pockets for storing small articles.

Press on the central mark to lock and unlock the lid. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

56 Storage Cupholders { Warning Caution

For safety, close the glove box When closing the glove box lid, during driving. There is a risk of do not allow stored items to pass injury from the open lid or items the line shown in the illustration. stored in the glove box. The glove box lid may break if it You and others could be seriously is closed when items inside have injured. passed the line and are sticking out from the box.

The glove box lid will automatically spring open when it is unlocked. Do Do not place items such as vehicle not put your face or head near registration documents or owner the lid. manuals in the glove box, but store them in the seat back pocket Pull the cupholder towards you to located on the back side of the open it. { Warning driver seat. Do not place a cup that is too full in Do not leave eyeglasses or a Refer to Storage Compartments the cupholder. Spillages could 0 54. lighter in the vehicle. Lighters cause damage to the radio and may explode and plastic lenses or other electrical circuits. If there is a frames may deform or crack if the spill, wipe it up immediately with a interior temperature becomes dry cloth. very hot. Do not tilt the cab with a filled cup in You and others could be seriously the cupholder. There may be a injured. danger of the cupholder breaking if the weight on each holder exceeds Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Storage 57 0.75 kg (1.65 lbs). Doing so may Single Cab Model Only Additional Storage also result in damage to the radio or other electronic components. { Warning Features Use the cupholders for storing small articles or cups. Do not use the back panel tray to Shopping Bag Hooks hold any object that may fly or fall Rear Storage out during vehicle operation. Doing so would be dangerous. Items may fly or fall out when the cab is tilted. You and others could be seriously injured.

The center area of the back panel tray can be used as a storage receptacle. The warning triangle and fire extinguisher can be carried in both sides. This can be used to hold plastic shopping bags. Do not hang anything weighing over 3 kg (6.6 lbs) or the hook will break. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

58 Storage Information on cab) or on the left center pillar panel Your dealer can advise you of the beside the shoulder seat belt anchor proper loading conditions for your Loading the Vehicle (crew cab). vehicle. Using selected heavier suspension components for added Overloading Gross vehicle weight (GVW) is the weight of the originally equipped durability may not increase any of the weight ratings shown on the VIN { Warning vehicle and all items added to it after it has left the factory. This and weight rating plate. Overloading can result in loss of would include bodies, lift gates, vehicle control and personal refrigeration systems, winches, injury or death, either by causing booms, etc., the driver and all component failures or by affecting occupants, and the load the vehicle is carrying. The GVW must not vehicle handling. It can also exceed the GVWR. Also, gross shorten the service life of your weight on each of the front and rear vehicle. must not exceed the front and rear GAWRs respectively. The components of your truck are designed to provide satisfactory service if the vehicle is not loaded in excess of either the gross vehicle weight rating (GVWR) or the maximum front and rear gross weight ratings (GAWRs). These ratings are listed on the vehicle identification number (VIN) plate, which is located on the left side rear pillar panel below the striker (single Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Storage 59

Model Maximum Front GAWR Rear GAWR help. The cargo load should be GVWR Capacity Capacity distributed on both sides of the kg (lb.) kg (lb.) kg (lb.) center line as equally as possible. Tires 4500HD 6 577 (14,500) 2 431 (5,360) 4 482 (9,880) The tires on your truck must be of 4500XD 7 258 (16,000) 3 007 (6,630) 4 998 (11,020) the proper size and properly inflated 5500HD 8 142 (17,950) 3 098 (6,830) 5 888 (12,980) for the load that you are carrying. The VIN, Weight Rating, and 5500XD 8 845 (19,500) 3 300 (7,275) 6 196 (13,660) “ Greenhouse Gas (GHG) Emissions Plate” shows the originally equipped tire size and recommended inflation Weight Rating, and Greenhouse pressures. Gas (GHG) Emissions Plate” shows the maximum weight that the front For the vehicle plate location, see axle can carry (front GAWR). It also Vehicle Identification Number (VIN) shows the maximum weight that the 0 353. rear axle can carry (rear GAWR). See “Tire Load and Inflation Table” The GVWR is the maximum under Tire Pressure 0 307. permissible loaded weight of the vehicle and takes into account the capabilities of the engine, transmission, frame, springs, brakes, axles and tires. Actual loads at the front and the rear axles can Maximum Front and Rear Axle only be determined by weighing the Weights vehicle. This can be done at highway weigh stations or other The weight of the cargo load must such places. See your dealer for be properly distributed over both the front and rear axles. The “VIN, Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

60 Storage Load Cargo Correctly Warning (Continued)

distributed over the front and rear axles so as not to exceed the axle capacities. It is extremely dangerous to overload the vehicle or to load the vehicle with the cargo positioned on one side. Load the vehicle correctly, observing the maximum loading capacity. Incorrect loading can make the cargo unstable. It can also cause { Warning an overload condition confined to a small area, resulting in damage Overloading can result in a crash to the cargo bed and frame. because it places too much strain Overloading places undue strain on the wheel studs with the result on vehicle parts. It can shorten that they break and the the vehicle's service life and come off. cause a crash. You and others The weight of the payload must could be seriously injured. be limited within the gross vehicle weight (GVW) rating and (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Storage 61

Cargo loading caution Incorrect Correct

Do not place cargo only at the front or only at the rear. Distribute it evenly.

When using supports under cargo, position them uniformly along the cargo.

To the greatest extent possible, do not allow long cargo to protrude beyond the rear edge of the cargo bed. Rather, use supports to raise it at an angle. Avoid supporting it using just the front guard frame and the rear edge of the cargo bed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

62 Storage

Cargo loading caution Incorrect Correct

Use ropes and tarpaulins to secure the cargo so it does not fall off the cargo bed. Use rubber bands or bungee cords to prevent the tarpaulins from flapping in the wind.

Avoid loading cargo too high. It can cause the vehicle to tip sideways when it catches side winds and when turning the vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Storage 63 Loading Equipment Make Sure There is No Flammable Material between the Cab and Cargo Bed

Caution

Be careful not to allow a sheet, canvas top, or the ends of ropes or rubber straps to touch or come close to the engine or exhaust pipe. During vehicle operation, the engine’s heat could set them on fire. Carefully secure the sheet, canvas top, or the ends of Do not load equipment from the rear ropes or rubber straps. of the cargo bed. The frame may become deformed when equipment Do not Carry Fuel and Spray Cans is loaded from the rear of the cargo in the Cab bed. In addition, the frame may become deformed even when loading equipment that has a weight { Danger under the maximum loading It is extremely dangerous to carry capacity. fuel and spray cans in the cab. When loading equipment, a device If such a container were to ignite for securing the cargo bed is or rupture, it could cause a fire or required. Use a car carrier or attach explosion. You and others could a rear support stand. If you have be seriously injured. any questions, contact your dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

64 Instruments and Controls Brake System Warning Light Vehicle Messages Instruments and (Parking Brake Light) ...... 74 Vehicle Messages ...... 86 Controls Antilock Brake System (ABS) Warning Buzzers ...... 91 Warning Light ...... 76 Exhaust Brake Light ...... 77 Controls Service Transmission Warning Steering Wheel Adjustment . . . . 65 Light ...... 77 Horn ...... 65 Automatic Transmission Fluid Windshield Wiper/Washer ...... 66 Temperature Warning Light . . . 78 Power Outlets ...... 67 Overdrive Off Light ...... 78 Wait-to-Start Light ...... 79 Warning Lights, Gauges, and Engine Oil Pressure Light ...... 79 Indicators Engine Oil Level Indicator Warning Lights, Gauges, and Light ...... 79 Indicators ...... 68 Diesel Exhaust Fluid (DEF) Instrument Cluster ...... 69 Warning Light ...... 80 Speedometer ...... 70 Engine Shutdown Warning Odometer ...... 70 Light ...... 80 Trip Odometer ...... 70 Idle Shutdown Light ...... 80 Tachometer ...... 71 Reduced Engine Power Fuel Gauge ...... 71 Light ...... 81 Engine Coolant Temperature High-Beam On Light ...... 81 Gauge ...... 72 Daytime Running Lamps (DRL) Diesel Exhaust Fluid (DEF) Indicator Light ...... 81 Gauge ...... 72 Cruise Control Light ...... 82 Seat Belt Reminders ...... 72 Battery Warning Light ...... 73 Information Displays Malfunction Indicator Lamp Driver Information (Check Engine Light) ...... 73 Center (DIC) ...... 82 Service Vehicle Soon Light . . . . 74 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 65 Controls 3. Firmly lock the steering wheel at the selected position by moving the lock lever to the Steering Wheel lock position. Adjustment Horn { Warning . Adjust the position of the steering wheel before you start driving. . To reduce the risk of personal injury, apply force The steering wheel is adjustable up to the steering wheel to and down as well as forward and make certain the steering backward. column is firmly locked Before adjusting, position the seat before driving. Also, do not as desired. try to tilt or adjust the steering wheel while the 1. Lift the lock lever toward you to vehicle is moving. If these unlock the steering column. To sound the horn, press the pad steps are not followed, the 2. Sit in the correct driving with a horn symbol on the steering steering column could move position, and then move the wheel. suddenly while the vehicle steering wheel up and down is in motion which could and forward and backward to cause a temporary loss of select the optimum steering steering control which may wheel position. result in personal injury or death. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

66 Instruments and Controls Windshield Wiper/Washer If the wiper frequently stops during operation, contact your nearest Dealer. Clear snow and ice from the wiper blades and windshield before using them. If frozen to the windshield, carefully loosen or thaw them. Damaged blades should be replaced. See Wiper Blade Replacement 0 275. Do not operate the wiper on a dry windshield surface. Otherwise, the windshield surface may sustain Windshield washer fluid is sprayed damage. over the windshield when this switch To use the windshield wiper and is pressed. At the same time, the washer switches, the engine control Windshield Washer windshield wiper operates. switch must be in the ON position. To spray washer fluid on the { Warning The windshield wiper switch has the windshield, push the button on the end of the combination switch lever. following positions, which In freezing weather, do not use correspond to the states of the The spray will continue as long as the washer until the windshield is you hold in the button. wiper. warmed. Otherwise the washer 9 : Stopped. fluid can form ice on the If windshield washer fluid does not windshield, blocking your vision. come out in sufficient quantity, 3 : Intermittent, light rain. immediately release the switch. Low Speed : Low speed, Otherwise, the windshield surface moderate rain. may sustain damage. High Speed : High speed, heavy rain. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 67 If windshield washer fluid does not Power Outlets When using accessory power come out, release the windshield outlets, total maximum electrical washer switch immediately. load must not exceed 120W. Always Otherwise the motor may seize up. turn off any electrical equipment Do not hold the switch pressed for when not in use. more than 30 seconds. Otherwise, Leaving electrical equipment on for the washer pump may sustain extended periods will drain your damage. battery. Check the washer fluid level regularly. Do it often when the weather is bad. See Washer Fluid 0 262 for information on filling the windshield washer fluid resevoir. You can plug in auxiliary electrical equipment. Just flip the outlet cover open from the left edge of the cover and follow the proper installation instructions that are included with any electrical equipment you install. These circuits are protected by a fuse and have maximum current loads. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

68 Instruments and Controls Warning Lights, Some warning lights come on briefly when the engine is started to Gauges, and indicate they are working. When one of the warning lights comes on Indicators and stays on while driving, or when Warning lights and gauges can one of the gauges shows there may signal that something is wrong be a problem, check the section that before it becomes serious enough explains what to do. Waiting to do to cause an expensive repair or repairs can be costly and even replacement. Paying attention to the dangerous. warning lights and gauges could For safety reasons, do not place prevent injury. packages, tools, or other items in the driver’s area that may restrict access to the controls or sight of the gauges. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 69 Instrument Cluster Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

70 Instruments and Controls Speedometer Odometer Check Switch To reset the trip odometer to zero, press and hold the trip odometer Press the Odometer Check switch The speedometer shows the reset stem while TRIP A or TRIP B to display the odometer and trip vehicle's speed in either kilometers is displayed. The engine control meter mileage after the key is per hour (km/h) or miles per switch should be in the ON position. hour (mph). turned off. The fuel gauge will also operate when this switch is pressed. When the battery is disconnected, Odometer The DIC and some lights will TRIP A and TRIP B will be reset to illuminate on the instrument panel. zero. The per trip fuel economy is also reset by the TRIP B reset. See Trip Odometer Driver Information Center (DIC) 0 82. When you turn the engine control switch to the ON position, the odometer/trip odometer shows what was displayed the last time the The odometer shows how far the engine control switch was turned to vehicle has been driven, in either LOCK or ACC. kilometers or miles. The trip odometer shows how far To set the odometer to display each Each time the reset knob is pressed the vehicle has been driven since time you turn the engine control with the engine control switch in the the trip odometer was last reset. switch to the ON position, turn the ON position, the odometer/trip meter Press the trip odometer reset stem engine control switch to LOCK or shows ODO, TRIP A, and TRIP B in next to the odometer to switch ACC while the odometer is this sequence. With the key between the odometer and trip displayed. With the reset stem removed, the odometer and trip odometer. pressed, turn the engine control meter continue to indicate for about switch to the ON position and then five minutes. within three seconds, turn the engine control switch back to the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 71 LOCK or ACC position. Follow the To check the fuel level with the same procedure to cancel the Caution engine control switch in the LOCK setting. position, press the Odometer Check Exercise extreme care when switch. Tachometer shifting down on a steep downslope. The engine speed Fill the tank well before it may exceed the critical speed, approaches empty. After filling up which can damage the vehicle. the fuel tank, it takes awhile for the fuel gauge needle to stabilize after the engine control switch is turned Fuel Gauge to the ON position. If the fuel tank is filled while the engine is off, but the engine control switch is in the ON position, the fuel gauge needle takes awhile to show the correct reading. See “Low Fuel Warning Light” in Driver Information Center (DIC) 0 82 and Running Out of Fuel 0 233. The tachometer displays the engine speed in revolutions per minute (rpm). The red zone indicates a range of dangerous engine speeds beyond permissable levels. Do not drive your vehicle With the engine control switch in the with the needle in the red zone. ON position, the fuel gauge indicates about how much fuel is left in the tank. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

72 Instruments and Controls Engine Coolant { Warning Caution (Continued) Temperature Gauge If the engine coolant temperature does not cross into it, this is not a gauge shows an overheat problem, but check the engine condition or you have any other coolant level in the reservoir. Add reason to suspect the engine may engine coolant as necessary. be overheating, continued operation of the engine, even for See “Engine Overheat Warning a short time, may result in a fire Light” under Driver Information and the risk of personal injury and Center (DIC) 0 82 and Engine severe vehicle damage. Take Coolant 0 253. immediate action as outlined in Engine Overheating. See Engine Diesel Exhaust Fluid 0 Overheating 259. (DEF) Gauge With the engine control switch in the The DEF gauge is part of the Driver ON position, this gauge indicates Information Center (DIC). See the temperature of the engine Caution Driver Information Center (DIC) coolant. C means cold while H 0 82. “ ” “ ” If the needle goes up above the means hot. During operation, the needle should stay in the safety upper limit and enters the H zone, Seat Belt Reminders zone. See Engine Overheating the engine is likely to overheat. 0 259. Immediately pull safely off the Seat Belt Warning Light road out of the way of traffic and There is a driver seat belt reminder take the necessary actions to light on the instrument cluster. deal with engine overheating. If the needle nears the H zone but (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 73 This light comes on briefly when the Malfunction Indicator ignition is turned on, but the engine is not running, as a check to show Lamp (Check Engine the light is working. It should go out Light) when the engine is started. If the light stays on, or comes on This warning light comes on and a while driving, there may be a warning buzzer sounds when the problem with the electrical charging driver is not wearing the seat belt system (such as a loose or broken while the engine control switch is in fan belt). Pull off to a safe place well the ON position. clear of traffic and contact your This light should come on to show When the vehicle speed exceeds dealer. Driving while this light is on that it is working when the engine 20 km/h (12 mph) with the seat belt could drain the battery. control switch is turned to the ON unbuckled, the warning light will Check and Corrective Action position, and then should go out flash and the buzzer will continue to after the engine is started. sound. The warning light will go out 1. Check to see if the fan belt is and the warning buzzer will stop broken or loose. If this light stays on or comes on when the driver buckles the 2. If the fan belt is loose, adjust while the engine is running, it seat belt. the tension. indicates a malfunction with the engine electronic emission control 3. If the fan belt is broken or there system. Avoid driving at high Battery Warning Light is no abnormality in the fan speeds and have the vehicle belt, see your dealer for inspected by your dealer. service. If this light comes on when the fuel See Battery - North America 0 269, tank is empty, you do not need to Jump Starting - North America have your vehicle serviced. See 0 311, and Engine Drive Belt Running Out of Fuel 0 233. Routing 0 363. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

74 Instruments and Controls If this light comes on intermittently If the light stays on, or comes on The brake system warning light or continuously while driving, while driving, the vehicle control comes on while the engine is service is required. Even if the system may be malfunctioning. Take running (after startup) in the vehicle is drivable and does not the vehicle to your dealer for service following situations: require towing, see your dealer as as soon as possible. . Drop in the level of brake fluid soon as possible. Continued driving (due to brake lining wear or fluid without having the system serviced Brake System Warning leakage). could cause damage to the Light (Parking Brake emission control system. It could . Abnormality in the charging also affect fuel economy and Light) system (such as an alternator drivability. This light should come on briefly malfunction or loose or split when the engine control switch is fan belt). Service Vehicle Soon turned to the ON position, and then . Abnormality in the anti-lock Light should go out after the engine is brake system (ABS) and started. Electronic Braking force Distribution (EBD) functions. Brake System Warning Light (The ABS warning light and brake system warning light will illuminate at the same time.) See Antilock Brake System (ABS) Warning Light 0 76. This light comes on briefly when the To serve as a reminder, the light engine control switch is in the ON should stay on when the parking position, but the engine is not brake is not fully released, and the If the light remains on after engine engine control switch is on. Have running, as a check to show the start up or comes on during light is working. It should go out the system repaired if the light does operation of the vehicle, it means not come on when it should. If this when the engine is started. that there is something wrong with part of the brake system. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 75 warning light does not go away, or have the vehicle towed to Parking Brake Light brake inspection and maintenance the nearest dealer for repair. should be performed. Continued driving without the necessary repairs could be Check and Corrective Action dangerous. 1. Check to see that the parking If this warning light stays on, see brake has been fully released. your dealer. If it has, check the following: The regular braking system is a split 2. Turn on the exhaust brake to system designed so that one part This indicator light comes on when help slow the vehicle. will provide some braking if there is the parking brake lever is pulled with the engine control switch on. 3. Pull off the road and stop a loss of hydraulic pressure in the carefully. Remember that other part of the system. This light also stays on when the stopping distances may be parking brake is not fully released longer, the pedal may be { Warning and the engine control switch is on. harder to push, and the pedal If this warning light stays on, see may go down farther than If this warning light comes on your dealer. normal. while the engine is running, The illumination of the parking brake 4. Check the brake fluid reservoir immediately stop the vehicle at a light does not necessarily ensure on the left side of the safe place well clear of traffic and firm application of the parking brake. instrument panel. If low, add contact your dealer for inspection. The parking brake lever must be fluid as needed. When the brake system warning sufficiently pulled up and locked. light is illuminated, brake 5. If the brake fluid is not low: Try Be careful not to drive the vehicle effectiveness may be decreased. out the brakes by starting and with the parking brake lever still stopping on the shoulder of the When this happens, strongly pulled up. road, then either drive press the brake pedal. cautiously at a safe speed to the nearest dealer for repair, See Brakes 0 263. if you judge driving to be safe; Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

76 Instruments and Controls Brake Low Vacuum Warning whenever the hydraulic brake . You may have to push much Light booster (HBB) becomes faulty. The harder on the brake pedal. warning buzzer will stop sounding . Have the vehicle repaired before when the parking brake is engaged. you continue driving. On 4500HD and 4500XD, the brake The buzzer stops when the selector low vacuum warning light and lever is shifted to the P position. warning buzzer should come on to indicate low vacuum reserve for brake power assist. At the same { Warning time, the Back up Electric Vacuum This light should come on briefly Do not drive while the buzzer Pump operates. when the engine control switch is sounds as the brakes are not turned to the ON position, and then (5500HD, 5500XD models) When operating to their full capacity. should go out after the engine is the HBB pressure is low, and/or the You and others could be seriously started. If the light does not come HBB fluid (Dexron –VI) level is low, injured. on when the engine control switch is the light and warning buzzer should turned to ON, it could indicate a come on. Do not use brake fluid in burned out bulb or a blown fuse. the brake booster reservoir. Use Antilock Brake System Have the system repaired if the light only Dexron –VI ATF. does not come on during this check. (ABS) Warning Light If this happens while driving: The warning light and buzzer will come on simultaneously when the . Do not pump the brakes. The brake booster’s vacuum or pressure system is designed to stop the becomes insufficient either during truck with reserve power assist if driving or when the engine control the pedal is held down. This switch is in the ON position, or when reserve is greatly reduced each there is an abnormality in the time you apply and release the charging system, such as an brakes. This light comes on briefly when the engine control switch is turned to alternator malfunction or loosening . Stopping distance may be the ON position, and then should go or splitting of the fan belt or longer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 77 out after approximately Exhaust Brake Light three seconds. If the light does not Warning (Continued) come on, have it fixed so it will be ready to warn if there is a problem. 3. Move the vehicle slowly forward. Gradually increase If this warning light stays on more the speed to 15 km/h than three seconds or comes on (9 mph). If the light goes off, while driving, there is a problem in the ABS is normal. the Anti-lock Brake System (ABS). In this case, the ABS stops working If the light does not come on or go out, or comes on frequently, This light comes on when the but the brakes still function as exhaust switch is pulled and the contact your dealer immediately ordinary service brakes. engine is running. See Exhaust and have the system repaired. Brake 0 222. { Warning Even if a problem has occurred in the ABS, the brakes will still work Service Transmission If this warning light comes on as normal brakes. In this case, Warning Light while driving, immediately stop the ABS has no influence on the your vehicle at a safe place well operation of the brake system. clear of traffic and take the following actions. See Brake System Warning Light 1. Stop the engine. (Parking Brake Light) 0 74 and 2. Restart the engine. Check if Antilock Brake System (ABS) 0 216. the ABS warning light comes on and then goes This light comes on briefly when the out. If it does, there is no engine control switch is in the ON problem. The ABS operates position, as a check to show the normally. light is working. It should go out (Continued) when the engine is started. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

78 Instruments and Controls If this light comes on while driving, it be accompanied by leakage of fluid Overdrive Off Light indicates that there is a malfunction from the transmission in the automatic transmission’s breather hose. electronic control system. If the If the light stays on, or comes on warning light is on, see your dealer while driving, slow down and pull off for service. the road. Stop the vehicle at a safe place and put the vehicle in Automatic Transmission P (Park). With the engine idling, wait Fluid Temperature until the light goes off. If the light This light should come on briefly Warning Light goes off, you can drive the vehicle when the engine control switch is again. Continuing to drive while this turned on as a check to make sure light is on may damage the the light is working. It should go out transmission. While this light is on, automatically. the transmission cannot operate in all gears. If you attempt to shift This light comes on when the gears, the vehicle may not continue overdrive off switch on the selector to move. If you cannot drive to a lever is turned on. Overdrive will not dealer immediately, have the vehicle operate even when the automatic This light comes on briefly when the towed. transmission is in D, unless engine engine control switch is in the ON speed is excessive. position as a check to show the light Caution is working. It should go out when the engine is started. Driving with the ATF warning light The Automatic Transmission Fluid constantly on can cause serious (ATF) Temperature warning light mechanical damage to the comes on if the ATF temperature is automatic transmission. high. This usually occurs when the transmission is overfilled and may See Automatic Transmission 0 205. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 79 Wait-to-Start Light This light comes on when the warning light in combination with the engine oil pressure has fallen below green engine oil level indicator light the normal level while the engine is can indicate if the engine oil level is running or the oil pressure across OK or low. the oil filter rises above the normal While driving, this light will also level while the engine is running. activate the engine alarm and If the warning light comes on while automatic shutdown system. driving, immediately pull off to a See Engine Oil Level Indicator Light This light comes on when the safe place and stop the engine. 0 79 and Engine Oil 0 245. engine control switch is turned to Check the oil level in the engine the ON position and goes out when crankcase. If the oil level is normal, Engine Oil Level Indicator preheating is complete. restrictions are in the oil filter or within the lubricating system. Have Light See Starting and Stopping the the vehicle inspected at your dealer. Vehicle 0 168. Do not run the engine with this light Engine Oil Pressure Light on. It could damage the engine. When this light comes on while driving, a warning tone also sounds. The oil level varies while the engine is running right after it has stopped When the engine oil level check or if the vehicle is on uneven switch is pushed with the engine ground. As a result, the red engine control switch in LOCK, the green oil pressure warning light may engine oil level indicator light will light up. This light should come on briefly come on if the engine oil level when the engine control switch is When checking the oil level, press is OK. turned to the ON position, and then the engine oil level check switch on See Engine Oil Pressure Light 0 79 should go out after the engine is level ground while the engine is and Engine Oil 0 245. started. cool. The red engine oil pressure Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

80 Instruments and Controls Diesel Exhaust Fluid Engine Shutdown Idle Shutdown Light (DEF) Warning Light Warning Light

This light comes on briefly when the This light should come on briefly The Engine Shutdown Warning light engine control switch is in the ON when the engine control switch is comes on briefly when the engine position and then should go out turned to the ON position, and go off control switch is turned to the ON when the engine has started. when the engine has started. position, as a check to show the Idle stop is a dealer programmable This light comes on as a warning light is working. The light turns off function which will automatically turn related to the selective catalytic when the engine is started. off the engine, at idle, when specific reduction (SCR) system. If this light This light will come on when the programmed conditions are met. comes on, check the DEF gauge. engine alarm and automatic See your dealer for details. Add DEF if necessary. If DEF level shutdown system is active. See This light comes on as an alert that is OK, have your vehicle serviced Engine Alarm and Automatic programmed conditions have been by your dealer. Shutdown 0 173. met and the engine is about to shut Also see Diesel Exhaust Fluid down. This light stays on after the 0 189. engine has stopped. See Idle Shutdown 0 174. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 81 Reduced Engine Power If this light comes on with the Refill Daytime Running Lamps Diesel Exhaust Fluid (DEF) warning Light light and the DEF warning light, refill (DRL) Indicator Light DEF as soon as possible. See “Refill Diesel Exhaust Fluid (DEF) Warning Light” under Driver Information Center (DIC) 0 82. See Malfunction Indicator Lamp (Check Engine Light) 0 73 and Diesel Exhaust Fluid (DEF) Warning This light comes on briefly when the Light 0 80. This light comes on when the DRL engine control switch is turned to are on. If the vehicle is started the ON position, and then should go during the daytime with the lighting out after the engine is started. High-Beam On Light switch off and the parking brake If this light comes on while the released, the low beam headlamps engine is running, it indicates power will come on at a reduced is being reduced due to one or more brightness. The light will go out of the following conditions: when the lighting switch is turned on. . Malfunction of the engine or 0 exhaust electronic control See Exterior Lamp Controls 92. system. This light comes on when the . DEF level is too low or empty. high-beam headlamps are in use or the headlamps are cycled between If this light comes on with the high and low beams (passing malfunction indicator lamp, see your signal). dealer immediately. See Headlamp High/Low-Beam Changer 0 93. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

82 Instruments and Controls Cruise Control Light Information Displays Driver Information Center (DIC)

This light should come on briefly when the engine control switch is This light should come on briefly turned to the ON position, and then when the engine control switch is should go out after the engine is turned to the ON position, and then started. should go out after the engine is This light comes on when the started. vehicle enters the cruise control For vehicles with cruise control, this mode after the cruise control set light comes on when cruise control switch is operated to set the vehicle is turned on. speed. See Cruise Control 0 223. The DIC display is in the center of the instrument cluster. The displays show the status of many vehicle systems. There are three parts to the DIC display: 1. DIC menu items and warning lights and messages (includes operation related information, diesel particulate filter (DPF) status, maintenance data, and errors) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 83 2. Automatic transmission shift DIC Menu Items economy. Turn the selector indicator clockwise or counterclockwise to 3. Diesel Exhaust Fluid (DEF) toggle through the items: average gauge fuel economy, per trip fuel economy, and instantaneous fuel economy. { Warning . Average Fuel Economy: Indicates the average fuel Warning or indicator lights economy over the total distance indicated on the DIC can be traveled. temporarily cleared (for . Per Trip Fuel Economy: 60 seconds) by pressing the DIC Indicates the per trip fuel selector once. However, if the economy based on the mileage warning light you have cleared is in the TRIP B. an engine overheat warning or . Instantaneous Fuel Economy: other critical circumstance, never Use the DIC selector to access the following menu items. Indicates the fuel economy at a continue driving without taking the given moment while driving. necessary actions. Otherwise, Language you will be in danger of vehicle How to Reset the Per Trip Fuel breakdown or accident. Should Select English, French, or Spanish Economy any of the critical warning lights by turning the DIC selector clockwise or counterclockwise. Per trip fuel economy is also cleared come on, immediately contact the when you reset the TRIP B to zero. nearest dealer. Fuel Economy Voltmeter The system calculates and stores The voltmeter shows the current the distance traveled and fuel status of the charge of the battery. consumption while driving to encourage the operator to drive the Green indicates the current status of vehicle economically. Press the DIC the charge of the battery. selector once or more to select fuel Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

84 Instruments and Controls Red means the battery voltage is decrease the year. While in the year Warning Lights and Messages too low or too high. If the voltmeter setting screen, press the DIC . Engine Overheat Warning Light sign appears in red, have the selector once to switch to the month vehicle checked and serviced at setting screen. The month segment . Low Coolant Warning Light your dealer. During or immediately will flash. Use the same method to . Water Separator Warning Light after the engine is started, a red set the month. While in the month abnormal L voltage may display on setting screen, press the DIC . Air Cleaner Light the DIC. If the warning disappears selector again to switch to the day . Low Fuel Warning Light after the engine has started, there is setting mode. Adjust the day using no problem with the battery voltage. the selector. . Regeneration Warning Lights . Exhaust System Warning Light Calendar and Clock Press and hold the DIC selector to complete the calendar setting. . Refill DEF Warning Light When complete, the normal { Warning . DIC Errors calendar display will resume. Use The calendar and clock can be this same method to set the hour . Maintenance Data set only while the vehicle is and minute when in the clock setting . Hour Meter stationary. When setting the screen. See Vehicle Messages 0 86. calendar or clock, park your Dimmer vehicle in a safe place where Maintenance Data Functions The brightness of the DIC can be stopping or parking is permitted adjusted while the light control Display/Not Display the and that is well clear of traffic. switch is off. Select this screen and Maintenance Data Function turn the DIC selector clockwise or Maintenance Light: On the DIC, go counterclockwise to brighten or dim Press the DIC selector once or to the Maintenance Indicator Light. the illumination. The brightness is more to select the calendar. Press Switch the display by pressing and linked to the adjustment of the and hold the DIC selector to enter holding the DIC selector for more instrument panel light level control the clock setting screen. The year than two seconds. Turn the DIC while the light control switch is on. segment will flash. Turn the DIC selector clockwise or See Instrument Panel Illumination selector clockwise or counterclockwise to switch the counterclockwise to increase or Control 0 95. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 85 display. Complete the resetting by Tire Rotation Only). Turn clockwise If you want to cancel the setting pressing and holding the DIC to increase distance and procedure, press the DIC selector selector for more than two seconds. counterclockwise to decrease once. The display will go back to the To cancel the setting procedure, distance. The distance increases previous screen. press the DIC selector once. The and decreases by 4,000 km (2,500 mi) increments. Complete the Diesel Exhaust Fluid (DEF) display will go back to the previous Gauge screen. resetting by pressing and holding the DIC selector. Resetting/Setting the Change Transmission and Differential Gear Interval (Odometer Reading) Oil and Power Steering Fluid: Initial Engine Oil and Filter Light : On value: 48,000 km (30,000 mi). the DIC, go to the engine oil and Adjustable minimum value: filter light. Enter the resetting screen 32,000 km (20,000 mi). Adjustable by pressing and holding the DIC maximum value: 48,000 km selector for more than two seconds. (30,000 mi). With the engine control switch in the Complete the resetting by pressing ON position, this gauge indicates Tire Rotation: Initial value: OFF. the approximate quantity of DEF and holding the DIC selector for Adjustable minimum value: more than two seconds. remaining in the DEF tank. F means 6,000 km (4,000 mi). Adjustable the tank is full and E means the Transmission and Differential maximum value: 62,000 km tank is almost empty. When only Gear Oil Light, Fuel Filter Light, (39,000 mi). one green bar is showing, the DEF Power Steering Fluid Light, and Starter Indicator Light : On the tank is almost empty and should be Tire Rotation Light : On the DIC, DIC, go to the starter indicator light. refilled soon. If the vehicle is driven go to the particular maintenance Enter the resetting screen by too long with only one bar, the green item to reset/adjust. Enter the pressing and holding the DIC will change to amber and additional setting change screen by pressing selector for more than ten seconds. warnings and indicators will display. and holding the DIC selector. Set Complete the resetting by pressing the change interval by turning the and holding the DIC selector for DIC selector. (Transmission and more than ten seconds. Differential Oil, Steering Fluid, and Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

86 Instruments and Controls Vehicle speed will be severely Vehicle Messages This light will also activate the limited when the DEF tank is empty. engine alarm and automatic Be sure to add DEF in advance of The Driver Information Center (DIC) shutdown system, if equipped. will display warnings, messages, the empty status. See Diesel See Engine Alarm and Automatic 0 and other operation-related Exhaust Fluid 189. Shutdown 0 173, Engine information to alert of system Overheating 0 259, Engine Coolant failures or other necessary checks 0 253, and Engine Coolant that should be performed. Use the Temperature Gauge 0 72. DIC selector to choose the desired screen page or function. { Warning Engine Overheat Warning Light When the engine coolant is still hot, do not remove the radiator OVERHEAT cap. Hot vapor will come out and This message displays and a you may be scalded. Add engine warning light appears when the coolant only when the engine engine has overheated and the coolant temperature has dropped. engine coolant temperature gauge needle reaches the red zone. At the If this light comes on and stays on same time a buzzer sounds. while you are driving, your engine Immediately pull off to a safe place coolant might have overheated to take the necessary actions and and your engine may be too hot. check the vehicle. Do not shut down You should pull off the road, stop an overheating engine immediately. your vehicle and take appropriate Otherwise, the engine may seize actions for engine overheating. up. Take appropriate actions for engine overheating. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 87 Low Coolant Warning Light section and make sure the warning See Fuel for Diesel Engines 0 227, light goes out. See Water in Fuel Fuel Gauge 0 71, and Running Out LOW COOLANT 0 231. of Fuel 0 233. If this message and light come on, If you continue driving with the the system is low on engine coolant Regeneration Required message displayed, the fuel Warning Light and the engine may overheat. injection system may fail. See Water A warning tone also sounds. If this in Fuel 0 231. REGEN. REQUIRED light comes on while driving, stop the vehicle immediately and check Air Cleaner Light This light (amber) comes on when the cooling system for leaks. See Running regeneration or Switch Engine Coolant 0 253 and have the CHECK AIR FILTER regeneration is required. When this vehicle serviced by your dealer. This This message displays and a light comes on, perform DPF light will also activate the engine warning light appears when the next regeneration soon. If the engine alarm and automatic shutdown air cleaner element service interval continues to run without performing system. is near or has already been DPF regeneration, this light will See Engine Alarm and Automatic reached. change color from amber to red. 0 If this light turns red, perform DPF Shutdown 173 and Engine Replace the air cleaner element. Shutdown Warning Light 0 80. regeneration immediately. If you do See Engine Air Cleaner/Filter 0 253. not perform DPF regeneration, the Water Separator (Fuel Filter) Low Fuel Warning Light check engine malfunction indicator Warning Light light and reduced engine power LOW FUEL indicator light will come on, WATER SEPARATOR This message displays and a imposing performance restriction on This message displays and a warning light appears when the fuel the vehicle. If this happens, the warning light appears when the level in the tank becomes too low vehicle must be serviced at your level in the water separator on the dealer. See Diesel Particulate Filter while the engine is running. Add fuel 0 fuel line is beyond the specified at the earliest possible time. If the 180. level. Drain water following the vehicle runs out of fuel, air bleeding instructions in the Water in Fuel procedure must be performed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

88 Instruments and Controls If your vehicle is equipped with a regeneration, the color of this light Keep people and flammable objects power take-off (PTO), monitor the changes to red from amber. When away from the exhaust pipe, DIC for DPF related indicators. PTO this light comes on in red, perform because the exhaust temperature and other slow speed applications DPF regeneration immediately by becomes high during regeneration. may require more attention. following the procedure for the When regeneration is completed, switch regeneration. If you do not the light goes out automatically. See Selectable (Switch) perform DPF regeneration, the Diesel Particulate Filter 0 180. Regeneration Required check engine malfunction indicator Warning Light During extended engine idling, this light and reduced engine power light may appear on the DIC and the SEL REGEN. REQUIRED indicator light will come on, DPF may be automatically imposing performance restriction on regenerated. Performing the “Selectable” the vehicle. If this situation happens, regeneration: After the Checking PM the vehicle must be serviced. See Checking PM Level Light Level Light is shown, this light Diesel Particulate Filter 0 180. comes on in amber when CHECKING PM LEVEL If your vehicle is equipped with a “Selectable” regeneration is In the case of performing the possible. When the DPF switch is power take-off (PTO), monitor the DIC for DPF related indicators. PTO "Selectable" regeneration, this light pressed with this light ON, comes on when the DPF switch is "Selectable" regeneration starts. and other slow speed applications may require more attention. kept held down. While this light is When the selectable regeneration or ON, the system is checking whether switch regeneration is interrupted: Regeneration in Progress or not the "Selectable" regeneration This light (amber) comes on when Light is possible. If the "Selectable" the "Selectable" regeneration or regeneration is possible, the light REGEN. IN PROGRESS "Switch" regeneration is interrupted. changes to the selectable (switch) When this light comes on, perform When this light is ON, DPF regeneration required warning light. DPF regeneration promptly by regeneration is in progress. When If the indication does not change to following the procedure for the the vehicle is stationary, the exhaust the selectable (switch) regeneration "Switch" regeneration. If you sound changes as the engine speed required warning light, the continue to operate the vehicle increases. Also, operating sounds of "Selectable" regeneration is not without performing DPF the exhaust throttle may be heard. possible. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 89 Exhaust System Warning Light result in a severe vehicle speed excess of that. For the items listed limitation. See Diesel Exhaust Fluid below, the displayed color will EXH. SYSTEM 0 189. change from green to amber when This light comes on when the SCR remaining distance is below system detects a malfunction or When DIC ERROR is Displayed 1 600 km (1,000 mi) and the screen incorrect DEF. SCR system will turn ERROR is selected. on other indicator lights and reduce If the system has not yet been able These screens are also displayed engine power in progressive stages when the engine control switch to encourage you to have the to access maintenance data, ERROR is shown on the DIC. turns to the ON position after above malfunction corrected. Continuing to notification timing. The message drive for too long after this light If ERROR does not change remains on the display until the DIC turns on will eventually result in a automatically to a distance or other selector is pressed once or the severe vehicle speed limitation. maintenance indication, have your vehicle is started. If this light turns on, promptly have vehicle serviced at your dealer. the vehicle inspected and serviced The maintenance data function at your dealer. See Diesel Exhaust Maintenance Data Indicator indicates the distance remaining Fluid 0 189. Lights before the next scheduled maintenance. Scheduled Refill Diesel Exhaust Fluid Maintenance data indicator lights appear on the DIC when each maintenance time is approaching (DEF) Warning Light maintenance item is selected or when the display turns from green to amber. Have the vehicle checked REFILL DEF when the next change or service interval of the item is near or has and serviced at your dealer as soon This message displays and a been reached. as possible. warning light appears when the DEF The distance or time shown is the The vehicle needs to be maintained tank is almost empty. Add DEF as more often if it is driven in severe soon as possible. remaining or excess of them to / from the change or service timing. conditions. Engine power will be reduced and The positive distance or time shows vehicle speed will be limited when the remaining of that and the this light is activated. Failure to negative distance or time shows the promptly refill the DEF tank will Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

90 Instruments and Controls MAINTENANCE ON or change. When this message next tire rotation displayed. When MAINTENANCE OFF displays amber, the next change of this message displays amber the This indicator displays and hides transmission oil and differential oil is next tire rotation is near or has maintenance items. When near or has been reached. already been reached. MAINTENANCE ON is displayed, FUEL FILTER STARTER maintenance items will be displayed. When MAINTENANCE When this message and light When this message and light is OFF is displayed, maintenance display green, it shows the distance green, it displays the number of items will not be displayed. remaining until the next fuel filter engine starts remaining until a change. When this message starter motor is replaced. When this When MAINTENANCE OFF is displays amber, the next change of message and light is amber, it displayed, there will be no display of fuel filter is near or has been displays when the time for a starter maintenance items such as rotation reached. motor replacement is near or has intervals or replacement intervals already been reached. even when such intervals arrive. STEERING OIL For the starter indicator light, the ENG OIL & FILTER When this message and light displayed color will change from display green, it shows the distance green to amber when the display When this message and light remaining until the next power display green, it shows the distance reaches zero and the screen is steering fluid change. When this selected. remaining until the next engine oil message displays amber, the next and filter change. When this change of power steering fluid is For resetting or setting maintenance message displays amber, the next near or has been reached. data intervals, see Driver change of engine oil and filter is Information Center (DIC) 0 82. near or has been reached. TIRE ROTATION T/M & DIFF OIL When this message and light show green with OFF, it means the When this message and light vehicle has been shipped from the display green, it shows the distance factory with no tire rotation interval remaining until the next set. When this message displays transmission oil and differential oil green it has the distance until the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Instruments and Controls 91 Hour Meter . Low engine coolant — beep HOUR METER . Engine alarm and automatic shutdown — beep This message and light indicate how many hours the engine has been . Diesel particulate filter (DPF) run. The figure(s) on the left side of switch regeneration — three the decimal point indicate hours short beeps or three long beeps while the figure on the right side . Selective catalytic reduction indicates 1/10 of an hour. (SCR) system — one short beep, three short beeps, nine Warning Buzzers quick beeps, continuous beep A warning buzzer may not sound if See Diesel Exhaust Fluid 0 189 and there is a problem with the buzzer Engine Alarm and Automatic system. If this occurs, the system Shutdown 0 173. needs to be inspected. See your dealer. A warning buzzer sounds under the following conditions: . Driver seat belt not buckled — continuous beep. See Seat Belt Reminders 0 72. . Brake booster — continuous beep. See Brake System Warning Light (Parking Brake Light) 0 74. . Engine overheat — continuous beep Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

92 Lighting Lighting Exterior Lighting 9 : Turns off all exterior lights. ; : Turns on the parking lights Exterior Lamp Controls including all exterior lights, except Exterior Lighting the headlights. Exterior Lamp Controls ...... 92 2 Headlamp High/Low-Beam : Turns on the headlights Changer ...... 93 together with the parking lights, Flash-to-Pass ...... 93 sidemarker lights, roofmarker lights, Hazard Warning Flashers ...... 94 taillights, license plate light, and Turn and Lane-Change instrument panel lights. Signals ...... 94 When you start the engine in Cornering Lamps ...... 95 daytime, with the lighting switch off, and release the parking brake, the Interior Lighting daytime running lights will come on. Instrument Panel Illumination Control ...... 95 See Daytime Running Lamps (DRL) Cargo Lamp ...... 96 Indicator Light 0 81 and Turn and 0 Dome Lamps ...... 96 Turning the light control switch to Lane-Change Signals 94. the following positions will cause the relevant lights to illuminate. The light control switch can be used when the engine control switch is placed in the LOCK or ACC position. Do not operate the combination lights for an extended time period with the engine off. Otherwise, the battery may go dead, making it impossible to restart the engine. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Lighting 93 Headlamp High/ Flash-to-Pass Low-Beam Changer

This indicator light comes on when high beam is selected or the headlights are cycled between high and low beams. Use low beam whenever there are vehicles ahead in the same lane or oncoming vehicles in the opposite lane. See Bulb Replacement 0 277. By lightly pulling the light control With the headlights on, move the switch lever and releasing it, the lever forward and backward to high beam comes on and off. At the switch between the high beam and same time, the headlights high low beam. beam indicator light on the instrument panel comes on and off. Moving the lever forward selects Use this function as a signal for high beam; moving the lever flash-to-pass a vehicle or other backward selects low beam. purposes. While the headlights are on high beam, the headlights high beam indicator light on the instrument panel remains on. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

94 Lighting Hazard Warning Flashers engine off. Otherwise, the battery Turn and Lane-Change may go dead, making it impossible to restart the engine. Signals

Both indicator lights flash when the hazard warning flasher switch is operated irrespective of the position of the engine control switch. Use the hazard warning light flasher The individual turn signals do not work when the hazard flasher is to warn other drivers any time your When turning left or right, move the turned on. vehicle becomes a traffic hazard, lever up or down to flash the turn day or night. With the engine control signal light. switch in any position or the key removed, when this switch is When the turn is completed, the pressed, all of the turn signal lights signal will cancel and the lever will and the turn signal indicator lights return to horizontal. flash to signal an emergency. To If the steering wheel is only turned a turn off the hazard lights, press the small amount, turn off the signal switch again. manually. Lightly press and hold the Do not leave the hazard warning lever up or down when overtaking or light flasher operating for an changing lanes. The turn signal light extended time period with the continues flashing as long as the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Lighting 95 lever is held up or down. The lever Cornering Lamps Interior Lighting moves back to neutral as soon as it is released. The cornering light illuminates the area to which the vehicle is turning. Instrument Panel A green light on the instrument With the headlights or marker lights Illumination Control panel is designed to flash to tell you on, the cornering lights come on in that the front and rear turn signal coordination with the turn signal lights are working. If the light stays lights. on, but does not flash, check for a 0 burned-out turn signal bulb. If the See Exterior Lamp Controls 92 0 green light does not come on when and Bulb Replacement 277. you move the lever, check the fuse and indicator bulb.

The control will change the light Either of these indicator lights level of the instrument panel. flashes when the turn signal switch is operated with the engine control switch in the ON position. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

96 Lighting Cargo Lamp Dome Lamps Rear Light (Crew Cab Model Only) Front Light

When this switch is pressed, the The dome light operates regardless rear body interior light comes on of the engine control switch position. and the indicator light on the switch The dome light operates regardless The switch has three positions. comes on. of the engine control switch position. The switch has three positions. ON : The light stays on regardless of the doors being open or closed. ON : The light stays on regardless of the doors being open or closed. OFF : The light stays off regardless of the doors being open or closed. OFF : The light stays off regardless of the doors being open or closed. Between ON and OFF, the light comes on when the driver's door is Between ON and OFF, the light opened. comes on when the driver's door is opened. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 97 Infotainment Radio System AM-FM Radio The radio or CD/USB player can be used when the ignition is on or in Control Panel ACC/ACCESSORY. Continued use Radio while engine is stopped may cause AM-FM Radio ...... 97 { Warning the battery to discharge. Radio Reception ...... 101 Take care not to spill liquids, etc. on Fixed Mast Antenna ...... 102 Adjust the radio or CD player only the radio or CD player. It may cause Audio Players while the vehicle is stationary. damage to the player. Adjusting them while the vehicle CD Player ...... 102 is moving could cause a crash. Do not disassemble or apply oil to USB Port ...... 109 radio or CD player. Auxiliary Devices ...... 117 You and others could be seriously Bluetooth Audio ...... 118 injured. Phone Adjust the volume so that sound Bluetooth ...... 121 outside of the vehicle can be heard. Trademarks and License If outside sound cannot be heard, Agreements crashes may be harder to avoid. Trademarks and License Do not install a radio equipment Agreements ...... 129 antenna near the vehicle's radio antenna. This could cause unwanted noise on the radio or while playing a CD. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

98 Infotainment System MODE/O /ENTER is pressed again, the audio system resumes the last mode just before it was turned off. Switching the Audio Modes 1. Press MODE/O /ENTER. 2. Turn MODE/O /ENTER to select the audio mode and press ENTER. The audio mode changes in the following order: FM1 ↔ FM2 ↔ FM3 ↔ DISC*1 *2 ↔ USB/IPOD(iPod)*3 ↔ BT- AUDIO ↔ AUX*4 ↔ AM1 ↔ AM2 ↔ FM1. *1 This mode is skipped when a disc is not inserted.

(1) Eject Turning the Power On or Off *2 The content to be displayed varies depending on the data (2) CD slot Press MODE/O /ENTER to turn the stored in the disc. (CD/ (3) MODE/O /ENTER power on. Press and hold it for MP3/WMA) (4) FUNC one second or more to turn the *3 These modes are skipped (5) LIST power off. when the USB/iPod is not (6) Tune/Track or Back If MODE/O /ENTER is pressed connected. "USB" is not (7) Presets while listening to music in audio displayed while an iPod is (8) Auxiliary Jack mode, the power is turned off. When connected. "IPOD" is not (9) USB displayed when "USB" is connected. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 99 *4 This mode is skipped when Adjusting Bass Adjusting Fader an auxiliary player is not 1. Press FUNC. 1. Press FUNC. connected. 2. Turn MODE/O /ENTER to 2. Turn MODE/O /ENTER to Adjusting the Volume select SOUND, and then press select SOUND, and then press Turn the MODE/O /ENTER knob ENTER. ENTER. clockwise or counterclockwise to 3. Turn MODE/O /ENTER to 3. Turn MODE/O /ENTER to increase or decrease the volume. select BASS, and then press select FADER, and then press Turning the power on or off with the ENTER. ENTER. volume set to maximum will damage the equipment and your hearing. Set 4. Turn MODE/O /ENTER 4. Turn MODE/O /ENTER the volume to a moderate level. clockwise or counterclockwise clockwise or counterclockwise to adjust the level, and then to adjust the front or rear The MODE/O /ENTER knob keeps press ENTER. speakers, and then press on turning until you stop. However, ENTER. the volume itself is limited, and even Adjusting Treble Adjustment of rear speaker volume if you keep on turning the MODE/O 1. Press FUNC. is not possible if there are no rear /ENTER knob clockwise or 2. Turn MODE/O /ENTER to speakers installed. counterclockwise, the volume is kept to a certain degree. select SOUND, and then press Adjusting Balance ENTER. When the gear lever is moved to the 1. Press FUNC. reverse (R) position, the system will 3. Turn MODE/O /ENTER to 2. Turn MODE/O /ENTER to automatically mute the sound. select TREBLE, and then press ENTER. select SOUND, and then press Function Setting Mode ENTER. 4. Turn MODE/O /ENTER Adjustment of bass, treble, fader, O clockwise or counterclockwise 3. Turn MODE/ /ENTER to and balance, and setting of clock to adjust the level, and then select BALANCE, and then display and time can be performed. press ENTER. press ENTER. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

100 Infotainment System 4. Turn MODE/O /ENTER 3. Turn MODE/O /ENTER 2. Turn MODE/O /ENTER to clockwise or counterclockwise clockwise or counterclockwise select "FM1", "FM2", "FM3", to adjust the right or left to select SET, and then press "AM1" or "AM2", and then speakers, and then press ENTER. press the "ENTER" button. ENTER. 4. Turn MODE/O /ENTER to set Follow one of the procedures below Clock Display the clock time (hour), and then to tune. 1. Press FUNC. press ENTER. Turn clockwise Tuning or counterclockwise to move 2. Turn MODE/O /ENTER to one hour forward or one hour Manual tuning: select CLOCK, and then press backward. 1. Press Tune/Track y or z for ENTER. 5. Turn MODE/O /ENTER to set less than one second. O 3. Turn MODE/ /ENTER the clock time (minute), and 2. Press Tune/Track y or z for clockwise or counterclockwise then press ENTER. Turn less than one second again to to select OFF or ON, and then clockwise or counterclockwise select the station of your press ENTER. to move one minute forward or choice. one minute backward. Time is not reset when clock mode Automatic tuning: is turned off. To return to the clock time (hour) 1. Press Tune/Track or for Setting the Time setting mode, press 0 while y z setting the clock time (minute). less than two seconds but 1. Press FUNC. more than one second. The Tuner Mode Operation radio starts searching for 2. Turn MODE/O /ENTER to Turning on the Radio stations, and stops when it select CLOCK, and then press finds a station. ENTER. 1. Press MODE/O /ENTER. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 101 2. Press and hold Tune/Track y 2. Tune in the station of your Here are some common reception choice. problems that probably do not or for more than z indicate a problem with your radio. two seconds. The radio keeps 3. Press and hold down the searching for stations within its Preset buttons you want to FM Transmissions available frequency band. To store in, for more than Fading and drifting stations - cancel, press the button again. two seconds. When the station is stored, the Preset button Generally, the effective range of FM When Tune/Track y is pressed, the number and station frequency is about 40 km (25 miles). Once radio is tuned to the higher appear on the display window. outside this range, you may notice frequency range (step up), and to fading and drifting, which increase the lower frequency range (step Radio Reception with the distance from the radio down) when pressing Tune/ transmitter. They are often Usually, a problem with radio accompanied by distortion. Track . z reception does not mean there is a Multi-path - FM signals are In either cases, if the radio cannot problem with your radio. It is just the reflective, making it possible for two find stations, it continues searching. normal result of conditions outside signals to reach your antenna at the the vehicle. For example, nearby Storing the Stations (PRESET) same time. If this happens, the buildings and terrain can interfere signals will cancel each other out, Favorite stations can be tuned by with FM reception. Power lines or causing a momentary flutter or loss one touch operation if they are telephone wires can interfere with of reception. stored in the Preset buttons. AM signals. Static and fluttering - These occur A maximum of 30 stations can be And of course, radio signals have a when signals are blocked by saved. 12 in AM (six each for limited range. The farther you are buildings, trees, or other large AM1 and AM2.), and 18 in FM (six from a station, the weaker its signal objects. Increasing the bass level each for FM1, FM2 and FM3.) will be. In addition, reception may reduce static and fluttering. 1. Select the radio mode to be conditions change constantly as Station swapping - If the FM signal stored from FM1, FM2, FM3, your vehicle moves. you are listening to is interrupted or AM1 or AM2. weakened, and there is another strong station nearby on the FM Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

102 Infotainment System band, your radio may tune in the Certification Audio Players second station until the original For Federal Communications signal can be picked up again. Commission (FCC) compliance CD Player AM Transmissions information for this device, see Radio Frequency Statement 0 370. CD Operations Fading - AM broadcasts are reflected by the upper atmosphere, Playing a Disc (When There is No especially at night. These reflected Fixed Mast Antenna CD Inserted) signals can interfere with those Insert a disc into the disc slot with received directly from the radio the label side (printed side) facing station, causing the radio station to up. The power will switch on and sound alternately strong and weak. playback will start automatically. Station interference - When a Playing a Disc (When There is a reflected signal and a signal CD Inserted) received directly from a radio station are very nearly the same frequency, 1. Press MODE/O /ENTER. they can interfere with each other, 2. Turn MODE/O /ENTER to making it difficult to hear the Pull the antenna out to its full length broadcast. select DISC, and then press when using it. ENTER. Static - AM is easily affected by To prevent breaking the antenna, external sources of electrical noise, shorten it when passing through Turning off the Player such as high tension power lines, areas with low clearance or through Press POWER for one second or lightning, or electrical motors. This a car wash. more. To resume playback, press results in static. POWER again. Ejecting the Disc Press EJECT to stop playback and eject the disc. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 103 If a disc could not be ejected, . Press y for fast forward. Random Playback contact nearest dealer for service. For CD: . Press z for fast reverse. To Track (File) Selection stop fast forward or fast reverse, Press 2. v is displayed. release. Press y or z to select the To cancel, press 2 again. track (file) of your choice. Repeat Playback For CD (MP3/WMA): . Press to advance to the next y For CD: . Press 2 to play all files in the track (file). Press 1. w is displayed. MP3/WMA disc in random order. . Press to return to the v is displayed. z To cancel, press 1 again. beginning of the track (file) being To cancel, press 2 twice. v For CD (MP3/WMA): played. To return to the previous disappears. track (file), press again. . Press 1 to repeat the same file . Press 2 twice to play the files Selecting the Folder being played. w is displayed. from the folder being played in For CD (MP3/WMA): To cancel, press 1 twice. w the MP3/WMA disc in random order. After the player has disappears. Press 5 or 6 to select the MP3/WMA played the last file, it starts folder. . Press 1 twice to repeat the same playing the first file of the same . Press n to advance to the next folder being played. After the folder. FLD v is displayed. folder. player has played the last file, it starts playing the first file of the To cancel, press 2 twice. FLD . Press q to return to the same folder. FLD w is v disappears. previous folder. displayed. Selecting the Music File from the Fast Forwarding/Fast Reversing To cancel, press 1 again. FLD Category List w disappears. For CD (MP3/WMA): Press and hold y or z to fast forward or fast reverse the 1. Press LIST for less than track (file). one second. LIST is displayed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

104 Infotainment System To cancel the category Go Back to the First Position TRACK (Track title) ↔ selection mode, press LIST (Home Jump) ARTIST (Artist name) ↔ TR again or press BACK. You can go back to the first file of NO/TIME... 2. Turn MODE/O /ENTER to the first folder on the MP3/WMA . For CD (MP3/WMA): select the category of your disc being played from any position FL/TR NO (Folder number/ of it. This function is called choice, and then press File number) ↔ TIME Home Jump. ENTER. The category changes (Playback time) ↔ in the following order: For example: If Home Jump is used FOLDER (Folder name) ↔ PLAYING ↔ FOLDER ↔ FILE when playing File 5 in Folder 4, it FILE (File name) ↔ ALBUM ↔ PLAYING... goes back to File 1 in Folder 1 and (Album title)* ↔ TRACK starts playing. (Track title) ↔ ARTIST 3. Turn MODE/O /ENTER to Press and hold down 5 for more (Artist name) ↔ FL/ select the folder or file of your than one second. TR NO... choice from the list, and then * It is not displayed during press ENTER. Display the Text Information the WMA file playback. 1. Press and hold down LIST for When the file is selected, the If the text information is too long to player starts playing the file. more than one second. fit into the display window, press When FOLDER is selected, 2. Turn the MODE/O /ENTER and hold down the FUNC for more select the file in the folder to than one second to switch to the start playback. switch to select the display item of your choice, and then next page. To return to the list selection or press ENTER. The display item Texts recorded with characters other category selection mode, press changes in the following order. than alphanumeric characters and BACK for less than one second. . For CD: symbols will appear as “*” To cancel the category selection (asterisks). TR NO/TIME (Track mode, press and hold down BACK If there is no text information stored for more than one second. number/Playback time) ↔ ALBUM (Album title) ↔ in a music file, NO TITLE is displayed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 105 If Error Appears in the Display . NO SUPPORT: This message is The audio may skip due to violent The following messages are displayed when the disc is in vibrations when the car is traveling displayed (blink) according to the one of the following conditions: across harsh roads. status. ‐ Not in Never insert foreign objects into the . LOAD: This message is ISO9660 Level 1, 2 format disc insertion slot. displayed right after inserting a ‐ Not containing MP3/WMA data Do not insert a wet disc into the disc into the main unit or while (including MP3/WMA player. reading TOC extension files) This player uses an invisible laser . READING: This message is ‐ Containing only SKIP FILEs beam which could cause hazardous displayed when reading the file If a disc could not be ejected, radiation exposure if directed format of the disc in the MP3/ please contact nearest dealer for outside the player. Be sure to WMA mode. service. operate the player correctly. . CD CHECK: This message is Playback may not be possible due displayed when the disc is Using the Compact Disc to recording conditions or disc stained or upside-down. This System characteristics, scratches, dirt, message is displayed when a Disc or deterioration. disc reading error or a media-dependent error occurs, When it is cold or when it is raining, Usable Discs including when a blank disc is the car windows will fog up and Music CDs with the following marks inserted. Check the disc in the cause dew (water drops) to form in can be used. CD-R and CD-RW player. the vehicle compartment discs recorded according to the (condensation). When this happens, CD-DA format can also be played. . DECK ERROR: This message is the audio may skip, and playback displayed when the player will stop. Ventilate the vehicle . CD-R (CD-Recordable), CD-RW cannot operate for some reason. compartment and dehumidify before (CD-ReWritable) may not be Eject the disc from the audio resuming use. able to play back due to the system. recording condition, characteristics of the disc, damage, dirt or deterioration due Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

106 Infotainment System to long exposure to the Mode CD mixed with DTS can Do not stick any paper tape to the environment of the vehicle also not be played accurately. recording side or the label side as it compartment. CD-R, CD-RW This device accepts 8 cm (3 in) may lead the disc to malfunction. that are not finalized and CD-R CD. Plug in the device directly Do not use a disc with cracks or if it and CD-RW that are saved in without using an adapter, etc. to is severely bent as it may lead to the UDF format cannot be avoid damage. damage. played (excluding MP3/WMA). When Removing a Disc Hold the disc without touching the . CD-TEXT function is only recording side as this may make the compatible with commercial CD Do not leave discs inside the player or partially inserted for a long time. disc dirty and lead to the audio compatible with CD-TEXT. skipping. Characters may not display This may scratch the discs and accurately in CD-R and CD-RW. make them unusable. Using benzene, record disc cleaner, Remove the disc horizontally from or anti-static fluids may damage the . CD, C-thru Disc with transparent disc. Using a dirty disc will damage or translucent recorded parts the main device. Do not pull it violently towards the top. the disc and lead to audio skipping. may not be inserted and ejected When the disc is dirty, use a accurately. Please do not Also do not pull it down hard while commercial disc cleaner to gently use them. removing. The disc may become clean it from the inside to the damaged and the audio may skip. . SACD (Super Audio CD) can outside. Do not use lens cleaner. only be played in the CD level of Do not insert objects other than Do not use the types of disc a hybrid disc. discs into the disc slot or insert described below because such . CCCD (Copy Control CD) may more than one disc at a time. discs may cause a breakdown. not play as it does not meet the Handling a Disc . Adapters or discs with special standard CD requirements. Avoid exposing the disc to direct properties, such as Dual Discs . CD-EXTRA can be played as a sunlight and always keep it in a and printable discs. music CD. The sound of a data case. Otherwise, the disc will bend . Discs with transparent or track of a Mixed Mode CD and become unusable. semitransparent sections on the cannot be played. Only music recording side. tracks can be played. A Mixed Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 107 . Discs with copy protection. to improve sound quality or protect This deck has limitations on MP3/ the discs, and CD labels, etc. They WMA file standards and recorded New Disc may change the thickness of the media and formats that can Some new discs may have burrs disc and external specifications and be used. found in the center hole or at the lead to damage. Playable MP3 File Standards edges. Remove these burrs with a Do not use commercially available ballpoint pen, etc. before using accessories (such as CD rings, Supported standards: the disc. protectors) that are said to improve . MPEG-1 Audio Layer III If they are not removed, the disc sound quality or are effective . MPEG-2 Audio Layer III may not be read accurately and against vibrations. They may come cause improper operation. off inside the device, causing the Supported sampling frequencies: disc to become unplayable or Rental Discs . MPEG-1: 32, 44.1, 48 (kHz) unretrievable and lead to Do not use any disc that has malfunction. . MPEG-2: 16, 22.05, 24 (kHz) cellophane tape or any rental disc Supported bit rate: that has glue from the label exposed MP3/WMA Files . MPEG-1: 32, 40, 48, 56, 64, 80, or some of the removed label still MP3 (MPEG Audio LAYER 3) is a attached to it. Using the disc like 96, 112, 128, 160, 192, 224, standard format for sound 256, 320 (kbps) this may cause the disc to not eject compression technology. properly and damage the disc. . MPEG-2: 8, 16, 24, 32, 40, 48, By using MP3, a file can be 56, 64, 80, 96, 112, 128, Discs with Special Shapes compressed to one-tenth the size of 160 (kbps) Heart-shaped or octagon-shaped the original. ‐ Variable bit rate (VBR) is discs cannot be played. Do not use WMA (Windows Media Audio) is a supported. them as they may cause damage. Microsoft sound compression format. It can compress sounds to a ‐ Does not support free format. Disc Accessories smaller size than the MP3. ‐ Digital Rights Management Do not use commercially available (DRM) is not supported. accessories (such as stabilizers, protective seals, etc.) that are said Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

108 Infotainment System Supported channel modes: . Variable bit rate (VBR) is time. It is also recommended that . Stereo supported. CD-R and CD-RW discs be kept in a light-resistant case because the . Joint Stereo . Lossless compression is not supported. discs are vulnerable to ultra-violet . Dual Channel light. ID3 Tag/WMA Tag . Monaural Format of Discs MP3/WMA files have an ID3 Tag/ Playable WMA File Standards WMA Tag that allows the input of The format of discs to be used must be ISO 9660 Level 1 or Level 2. Supported standards: information so that data such as song title and artist can be saved. Control items for this standard are . WMA Ver. 7 as follows: This deck supports ID3 Ver. 1.0, 1.1, . WMA Ver. 8 2.2, 2.3 and WMA tags. . Maximum directory layers: 8 layers . WMA Ver. 9 Media . Maximum characters for folder Supported sampling frequencies: Media such as CD-R and CD-RW names/file names: 48 (including . 32 discs are capable of playing MP3/ “_” and 3 letter file extension) WMA files. Compared to the . 44.1 . Maximum number of folders: CD-ROM media commonly used for 192 (including the root folder) . 48 (kHz) music discs, CD-R and CD-RW Supported bit rates: discs are easily damaged in high . Maximum number of files per temperature/high humidity disc: 255 . Ver. 7, 8: CBR 48, 64, 80, 96, environments and part of the CD-R 128, 160, 192 (kbps) A root directory is counted as one and CD-RW may become incapable folder. . Ver. 9 (9.1/9.2): CBR 48, 64, 80, of playback. Fingerprints or 96, 128, 160, 192, 256, scratches on the disc may prevent File Names 320 (kbps) playback or cause skipping during Only files with the MP3/WMA file playback. Sections of a CD-R or extension mp3, .wma can be ‐ Only compatible with CD-RW may deteriorate if it is left 2-channel playback recognized as MP3/WMA and inside a vehicle for long periods of played. Be sure to save MP3 files Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 109 with the mp3 file extension. Be sure be recorded without files other than When a disc is inserted, the CD to use the .wma file extension when MP3/WMA files and without player screen will be displayed for saving WMA files. The MP letters of unnecessary folders in order to about a few seconds while the unit the file extension will be recognized speed up the checking of disc files checks whether the CD is an audio whether entered as uppercase by the deck. CD or whether it contains MP3/ letters or lowercase letters. WMA data. MP3/WMA Playing Time Display If the .mp3 or .wma file extension is Normally, tracks in ROOT FOLDER attached to a file other than an MP3/ It is possible that playing time will will be played in order from the WMA file, that file will be mistakenly not be correct, depending on the first file. recognized by the deck as an MP3/ writing condition of the MP3/WMA WMA file and played, resulting in file or when VBR Fast Up/Down is USB Port loud noise output that can damage operated. the speakers. Be sure to avoid Display Order of MP3/WMA File/ USB Operation attaching the mp3 or .wma file Folder Names Playing Music Files in the USB extension to files that are not MP3/ Names of MP3/WMA folders and Memory (When the USB Memory WMA files. files within the same level are is not Connected) Multi-Sessions displayed in the following order. When the USB Memory is Does not support multi-session. 1. MP3/WMA folders displayed connected to the USB terminal When the disc used is a first, by ascending order of users can listen to music in the USB multi-session disc, only the first numbers, letters. The files Memory. session will be played. stored just below the root of the 1. Connect the USB Memory to disc will be stored in the ROOT the USB terminal. Playing MP3/WMA FOLDER. 2. Press MODE/O /ENTER. When a disc with recorded MP3/ 2. Files displayed next, by WMA files is inserted, the deck first ascending order of numbers, 3. Turn MODE/O /ENTER to checks all the files on the disc. No letters. It is assumed here that sound is emitted while the deck is select USB, and then press a disc has already been loaded ENTER. checking the files on the disc. It is into the unit. recommended that the disc should Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

110 Infotainment System The music file starts playing. When the USB mode is switched to . Press y to fast forward. other modes and then switched Playing Music Files in the USB back again, the main unit returns to . Press z to fast reverse. Memory (When the USB Memory the music file played last. is Connected) Release to stop. File Selection 1. Press MODE/O /ENTER. Repeat Playback Press y or z to select the music Press 1 to repeat the same file 2. Turn MODE/O /ENTER to file of your choice. select USB, and then press being played. w is displayed. Press to advance to the ENTER. . y To cancel, press 1 twice. w next file. The music file starts playing. disappears. Do not connect, operate or remove . Press z to return to the Press 1 twice to repeat the same the USB Memory while driving. beginning of the file being folder being played. After the player played. Press again to return to Do not remove the USB Memory or has played the last file, it starts the previous file. turn the ignition off or to ACC/ playing the first file of the same ACCESSORY when the USB Selecting the Folder folder. Memory is being accessed Press 5 or 6 to select the MP3/WMA FLD w is displayed. To cancel, (playback). This may damage the folder. w data. We recommend making a press the button again. FLD disappears. backup of your data in case you . Press n to advance to the next accidentally delete it. folder. Random Playback Depending on the USB Memory . Press q to return to the . Press 2 to play all files in the used (non-brand products, USB previous folder. USB Memory in random order. Memories which have been v is displayed. To cancel, damaged due to external factors), Fast Forwarding/Fast Reversing press the button twice. v there may be cases where disappears. connection is not possible, or where Press and hold y or z to fast the operation is unstable. forward or fast reverse the music file. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 111 . Press 2 twice to play the files 3. Turn MODE/O /ENTER to Display the Text Information from the folder being played in select the folder or file of your 1. Press and hold down LIST for the USB Memory in random choice from the list, and then more than one second. order. press ENTER. After the player has played the last 2. Turn MODE/O /ENTER to When the file is selected, the select the display item of your file, it starts playing the first file of player starts playing the file. the same folder. choice, and then press When FOLDER is selected, ENTER. FLD v is displayed. select the file in the folder to The display item changes in start playback. To return to the the following order. To cancel, press 2 again. FLD v list selection or category disappears. selection mode, press BACK FL/TR NO (Folder number/File Selecting the Music File from the for less than one second. number) ↔ TIME (Playback time) ↔ FOLDER (Folder Category List To cancel the category name) ↔ FILE (File name) ↔ selection mode, press and hold 1. Press LIST for less than ALBUM (Album title)* ↔ down Back for more than one second. LIST is displayed. TRACK (Track title) ↔ ARTIST one second. To cancel the category (Artist name) ↔ FL/TR NO... selection mode, press LIST Go Back to the First Position * It is not displayed during the again or press Back. (Home Jump) WMA file playback. 2. Turn MODE/O /ENTER to You can go back to the first file of If the text information is too long to select the category of your the first folder on the USB Memory fit into the display window, press being played from any position of it. choice, and then press and hold down FUNC for more than This function is called Home Jump. ENTER. The category changes one second to switch to the in the following order: For example: If Home Jump is used next page. when playing File 5 in Folder 4, it PLAYING ↔ FOLDER ↔ FILE Texts recorded with characters other goes back to File 1 in Folder 1 and ↔ PLAYING... than alphanumeric characters and starts playing. symbols will appear as "*" (asterisks). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

112 Infotainment System If there is no text information stored NO MUSIC: This message is Playing Music Files in the iPod in a music file, NO TITLE is displayed when a blank USB device (When the iPod is not Connected) displayed. or the USB device that does not 1. Use the iPod connection cable, contain files with playback If an Error Appears in the Display and connect the iPod to the extensions is connected. USB terminal. The following messages are READ ERROR: This message is displayed (blink) according to the displayed if a problem is detected in 2. Press MODE/O /ENTER. status. the USB device. Disconnect the 3. Turn MODE/O /ENTER to READING: This message is USB device, and check the USB select IPOD, and then press displayed when reading the file device itself. ENTER. format of the USB devices. NO SUPPORT: This message is READING is displayed, and it USB ERROR 1: This message is displayed when the USB device takes a few seconds to displayed when the player cannot contains no MP3/WMA data recognize the music files in the operate for some reason. (including MP3/WMA extension iPod. When the music files in Disconnect the USB device from the files) or contains only SKIP FILEs. the iPod are recognized, iPod audio system. iPod Operation playback begins. It will start the USB ERROR 2: This message is playback with the music file displayed when the connected USB When the iPod is connected to the that was playing on the iPod device is disabled. Connect another USB terminal using the iPod before it was connected to the USB device. connection cable, users can operate main unit. If the main unit the iPod from the main unit and cannot detect that file, it will USB ERROR 3: This message is listen to music on the iPod. displayed when the USB hub is start playing from the first connected. Remove the USB hub See the instruction manual for the music file. from the audio system. iPod Connection Cable on how to connect and set the connection cable. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 113 Playing Music Files in the iPod Pausing the Music To cancel, press twice.w (When the iPod is Connected) Press 3 to pause the music. To disappears. 1. Press MODE/O /ENTER. resume, press 4. When the iPod is removed from the File Selection main unit under the Repeat setting, 2. Turn MODE/O /ENTER to the iPod switches to the repeat select IPOD, and then press Press y or z to select the music playback mode. ENTER. The music file starts file of your choice. playing. Random Playback (SHUFFLE) . Press y to advance to the Press 2. next file. { Warning The mode changes as follows each . Either place the iPod and . Press z to return to the time you press 2: previous file. Press again to iPod connection cable OFF → Album Shuffle → Track return to the previous file. somewhere where they do Shuffle → OFF not interfere with driving or Fast Forwarding/Fast Reversing temporarily secure them at . Album Shuffle: v is displayed a location where they are Press and hold y or z to fast and the albums will be played not in the way. They could forward or fast reverse the back in shuffle mode (tracks impede driving and cause a music file. within an album will not be crash. shuffled). . Press y to fast forward. . Make sure not to touch the . Track Shuffle: FLD v is terminals of the iPod . Press z to fast reverse. displayed and the selected list connection cable. Release to stop. will be played back in . Do not connect, operate or shuffle mode. Repeat Playback remove the iPod while When the iPod is removed from the driving. Press 1 to repeat the same file main unit under the Shuffle setting, being played. w is displayed. the iPod switches to the shuffle playback mode. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

114 Infotainment System Selecting the Music File from the The following information is 3. Turn MODE/O /ENTER to Category List displayed according to the display the selection mode of You can search for a music file you category selected: your choice, and then press want to listen to from categories . PLAYING: displays the list ENTER. such as artists or genres. of the music being played It repeats the operation until 1. In the iPod mode, press the . PLAYLISTS: displays the the SONGS selection mode is LIST. The category is list of playlists displayed. displayed. . ARTISTS: displays the The order for the display of the 2. Turn MODE/O /ENTER to artist list SONGS selection mode for each category is shown below. select the category of your . ALBUMS: displays the choice, and then press album list When SONGS, EPISODES or ENTER. The category changes AUDIOBOOKS (CHAPTERS) in the following order: . SONGS: displays the is selected, the music file song list selected is played. PLAYING ↔ PLAYLISTS ↔ . PODCASTS: displays the ARTISTS ↔ ALBUMS ↔ list of the podcast SONGS ↔ PODCASTS ↔ GENRES ↔ COMPOSERS ↔ . GENRES: displays the AUDIO BOOKS ↔ PLAYING... genre list . COMPOSERS: displays the composer list . AUDIOBOOKS: displays the audio book list Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 115

Order for the display of the The display item changes in Category SONGS selection mode the following order. TR NO/TIME (File number/ PLAYING SONGS Playback time) ↔ ALBUM PLAYLISTS PLAYLISTS → SONGS (Album title) ↔ TRACK (Track title) ARTIST (Artist name) ARTISTS ARTISTS → ALBUMS → SONGS ↔ ↔ TR NO/TIME... ALBUMS ALBUMS SONGS → . If the text information is too long SONGS SONGS to fit into the display window, press and hold down FUNC for PODCASTS PODCASTS → EPISODES more than one second to switch GENRES ARTISTS ALBUMS GENRES → → to the next page. SONGS → . Texts recorded with characters COMPOSERS ALBUMS other than alphanumeric COMPOSERS → → SONGS characters and symbols will appear as "*" (asterisks). AUDIOBOOKS AUDIO BOOKS → (CHAPTERS) . If there is no text information stored in a music file, NO TITLE Follow the operations below to play Display the Text Information is displayed. music files: 1. Press and hold down LIST for If ERROR Appears in the Display . Select a music file in the list at more than one second. The following messages are the lowest hierarchy level displayed (blink) according to the to play. 2. Turn MODE/O /ENTER to select the display item of your status. . Press BACK while displaying the choice, and then press list at the middle hierarchy level. ENTER. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

116 Infotainment System

Message Description Playable MP3 File Standards . Supported standards: This message is displayed when READING reading the file format of the iPod. ‐ MPEG-1 Audio Layer III This message is displayed if a ‐ MPEG-2 Audio Layer III problem is detected in the iPod. READ ERROR . Supported sampling frequencies: Disconnect the iPod, and check the iPod itself. ‐ MPEG-1: 32, 44.1, 48 (kHz) This message is displayed when an ‐ MPEG-2: 16, 22.05, 24 (kHz) iPod communication error occurs. COMM ERROR . Supported bit rate: Reconnect the iPod connection MPEG1: 32, 40, 48, 56, 64, cable. ‐ 80, 96, 112, 128, 160, 192, This message is displayed when a NO SONGS 224, 256, 320 (kbps) blank iPod is connected. ‐ MPEG2: 8, 16, 24, 32, 40, 48, This message is displayed when a 56, 64, 80, 96, 112, 128, NO PLAYLIST blank PLAYLIST is selected. 160 (kbps) . Variable bit rate (VBR) is supported. USB Devices . Compatible Device: USB mass storage class . Does not support free format. USB Memory Standards This system is not compatible with . Digital Rights Management . Compatible file system : external hard drive units (pocket (DRM) is not supported. FAT16/32 hard disk drives). Connections using . Supported channel modes: . Audio format that is playable : HUB, etc. are not supported. stereo, joint stereo, dual MP3/WMA channel, monaural . Compatibility : USB2.0 (Full speed) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 117 Playable WMA File Standards Display Order of MP3/WMA File/ 1. Use the mini plug cable, and . Supported standards: Folder Names connect the portable audio Names of MP3/WMA folders and device to the Mini jack. . Supported sampling frequencies: 32, 44.1, 48 (kHz) files within the same level are 2. Press MODE/O /ENTER. displayed in the following order. . Supported bit rates: Ver. 7, 8: 3. Turn MODE/O /ENTER to CBR 48, 64, 80, 96, 128, 160, 1. MP3/WMA folders displayed first, by ascending order of select AUX, and then press 192 (kbps) Ver. 9 (9.1/9.2): CBR ENTER. 48, 64, 80, 96, 128, 160, 192, numbers, letters. The files 256, 320 (kbps) stored just below the root of the Connecting the mini plug cable to disc will be stored in the ROOT the Mini jack also establishes the Only compatible with 2-channel FOLDER. AUX mode and enables you to use playback 2. Files displayed next, by the portable audio device. . Variable bit rate (VBR) is ascending order of numbers, When the mini plug cable is supported. letters. It is assumed here that disconnected from the main unit, the . Lossless compression is not a disc has already been loaded AUX mode is cancelled. into the unit. supported. Adjusting the Volume ID3 Tag/WMA Tag Normally, tracks in ROOT FOLDER will be played in order from the Turn the Volume adjust knob MP3/WMA files have an ID3 Tag/ first file. clockwise or counterclockwise to WMA Tag that allows the input of adjust the volume. information so that data such as Auxiliary Devices . Turn clockwise: Increase the song title and artist can be saved. volume. AUX Operation This deck supports ID3 Ver. 1.0, 1.1, . Turn counterclockwise: 2.2, 2.3 and WMA tags. By connecting the 3.5 mm Decrease the volume. headphone jack of your own portable audio device to the Mini jack, you can listen to your own music through this unit. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

118 Infotainment System Reduce the AUX volume to prevent Do not leave the portable device { Warning speaker damage. inside the vehicle. (The interior of the vehicle may become too hot . Either place the portable under extreme hot weather.) audio device and mini plug Bluetooth Audio cable somewhere where Bluetooth Audio Operation Do not set the portable device too they do not interfere with close to this unit. When the device driving or temporarily secure Connecting a Bluetooth compatible and the unit are too close to each them at a location where audio player or mobile phone to this other, sound quality may deteriorate they are not in the way. unit allows you to operate them from and connection problems may arise. the system and listen to music. They could impede driving Playing Music and cause a crash. In addition, as the connection . Make sure not to touch the between the unit and the portable 1. Press MODE/O /ENTER. device is wireless, users will not terminals of the mini plug 2. Turn MODE/O /ENTER to cable. face problems associated with cable connections. select BT-AUDIO, and then . Do not connect, operate or press ENTER. This unit supports Bluetooth. remove the portable audio The music on the Bluetooth device while driving. Bluetooth is a wireless data system which allows users to listen to music compatible device that is without the need to connect the connected will start. The volume set by adjustment in the portable device with wires. When the registered device is AUX mode is effective in the AUX not connected, NO CONNECT mode only. If the portable device is not Bluetooth-compatible, this function is displayed. To power the portable audio device, is not available. First connect the portable device to use the battery or other power the unit before performing the source supplied with the device. Do not connect the portable device while driving. following operation. See The AUX device cannot be “Registering a Bluetooth Device” in controlled from the main unit. Bluetooth 0 121. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 119 Bluetooth audio operation is subject z: Return to the beginning of the Repeat Playback to portable device compatibility. track being played. To return to the Press 1 to repeat the same track Operation of the portable device via previous track, press the z again. being played. w appears on the this unit differs depending on the Operation of the portable device via display. To cancel, press 1 twice. specifications of the portable device. this unit differs depending on the Press 1 twice to repeat the same Depending on the specifications of the portable device. album being played. Bluetooth-compatible portable device that is connected to this unit, Fast Forwarding/Fast Reversing After the player has played the last the music will not start and may be file, it starts playing the first file of Press and hold y z to fast w paused. forward or fast reverse the track. the same album. FLD appears on the display. When the player is connected to an y: Fast forward. Audio Video Remote Control Profile Operation of the portable device via (AVRCP) Version 1.0 compatible z: Fast reverse. this unit differs depending on the portable device, STREAMING To stop fast forward or fast reverse, specifications of the portable device. displays and the functions of your release the button. devices may be partially limited. Random Playback Operation of the portable device via Press 2 to play all tracks in the Stop Playback this unit differs depending on the Bluetooth Audio in random order. Switch to another audio mode. specifications of the portable device. v is displayed. Selecting the Album Pausing the Music To cancel, press 2 twice. Press 5 or 6 to select an album. Press 3 to pause the music. Press 2 twice to playback tracks on Press 4 to resume. n: Advance to the next album. the album being played in random q: Return to previous album. order. After the player has played Track Selection the last track, it starts playing the Operation of the portable device via first track of the same album. Press the y z to select the track this unit differs depending on the of your choice. specifications of the portable device. FLD v is displayed. y: Advance to the next track. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

120 Infotainment System To cancel, press 2 again. If there is no text information stored DISCONNECT: Disconnect the in a music file, NO TITLE is registered portable device. Display the Text Information displayed. DISCONNECT? is displayed, 1. Press and hold LIST for more press ENTER. than one second. Displaying the Registered Portable Device DELETE: Delete the registered portable device. When 2. Turn MODE/O /ENTER to 1. Press FUNC. select the display item of your DELETE? is displayed, press choice, and then press enter. 2. Turn MODE/O /ENTER to ENTER. The display item changes in the select BLUETOOTH, and then METHOD: Change the following order. press ENTER. connection method. Select FROM VEHICLE, to connect 3. Turn MODE/O /ENTER to . TR NO/TIME: Track number/ the portable device by Playback time select LIST AUDIO, and then operating from the unit. Select press ENTER. . ALBUM: Album title FROM AUDIO, to connect the unit from the portable device. . TRACK: Track title 4. Turn MODE/O /ENTER to select device name, and then If ERROR Appears in the Display . ARTIST: Artist name press ENTER. If the text information is too long to The following message is displayed 5. Turn MODE/O /ENTER to fit into the display window, press according to the status. and hold down FUNC for more than select the display item of your NO CONNECT: This message one second to switch to the choice, and then press appears when the unit is not next page. ENTER. connected to the portable device. Texts recorded with characters other SELECT: Connect the than alphanumeric characters and registered portable device. symbols will appear as "*" SEARCHING is displayed. (asterisks). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 121 Phone 2. Turn MODE/O /ENTER to DEVICE? is displayed, you must select BLUETOOTH, and then delete the registered Bluetooth Bluetooth press ENTER. device. 3. When PAIRING is displayed, Connect to the Bluetooth Device This unit supports Bluetooth. Automatically Bluetooth is a wireless data system press ENTER. by which you can call without your If the Bluetooth device has 1. Press FUNC. mobile phone being connected with already been registered in this 2. Turn MODE/O /ENTER to a cable or placed on a cable. If your unit, turn MODE/O /ENTER to select BLUETOOTH, and then mobile phone does not support select PAIRING. Bluetooth, this unit cannot function. press ENTER. 4. After CAR AUDIO, a 4-digit 3. Turn MODE/O /ENTER to Registering a Bluetooth Device passkey is displayed, operate the Bluetooth device to enter select A.CONNECT, and then Connecting a Bluetooth device press ENTER. (mobile phone or Bluetooth the passkey. compatible audio player) to this unit See the instruction manual 4. Turn MODE/O /ENTER to allows you to operate them from the enclosed with your portable select ON/OFF, and then press unit and talk in handsfree mode or device on how to operate it. ENTER. listen to music. When a Bluetooth 5. When the registration of the CONNECT ON: Turn on the connection is established, 4 is Bluetooth device in this unit is automatic connection. displayed. completed, CONNECTED is CONNECT OFF: Turn off the Do not register the Bluetooth device displayed. automatic connection. while driving. Park the vehicle in a If FAILED is displayed, after Clearing the Bluetooth Settings secure location before carrying out the passkey is entered, try the registration. registering again. You can clear the Bluetooth settings or histories stored in this unit. 1. Press FUNC. Up to five Bluetooth devices can be registered on the unit. If it exceeds the limit of registrations and DEL Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

122 Infotainment System Do not clear the settings while . History of outgoing/incoming/ driving. Park your vehicle in a missed calls secure location and then . Speed dial data initialize them. . Handsfree setting 1. Press FUNC. . Bluetooth phone data 2. Turn MODE/O /ENTER to Portable device data select BLUETOOTH, and then . press ENTER. . Portable device connection setting 3. Turn MODE/O /ENTER to select RESET DATA, and then press ENTER. 4. When RESET DATA? is displayed, press ENTER. PLEASE WAIT is displayed, when reset is complete COMPLETED is displayed. The reset Bluetooth settings or histories are unrecoverable. Be careful when clearing them. When selling your vehicle, make sure to delete all personal data in your audio system. You should delete the following Handsfree/ Bluetooth Audio data from the system: . Phonebook data Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 123 Operating the Handsfree System In the following conditions, the system may not function: . The mobile phone is turned off. . The current position is outside the communication area. . The mobile phone is not connected. . The mobile phone has a low battery. You can register mobile phones and store phone numbers to the unit as follows: . Up to 1,000 phone numbers can be stored. . Up to six phone numbers can be stored in the speed dial list. Making a Phone Call by Entering a (1) MODE/O /ENTER First connect the mobile phone to Phone Number (2) FUNC the unit before performing the following operation. See Do not enter a phone number while (3) Off Hook “Registering a Bluetooth Device". driving. Park your vehicle in a (4) On Hook secure location and then enter the (5) Level Adjust Do not leave your mobile phone in the vehicle. The temperature inside phone number. (6) Speed Dial the vehicle may be high and 1. Press Off Hook on the damage the phone. infotainment controls. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

124 Infotainment System 2. Turn MODE/O /ENTER to Making a Phone Call Using Making a Phone Call Using Missed select ENTER NUMBER, and Phonebook Call History then press ENTER. 1. Press Off Hook on the 1. Press Off Hook on the INPUT NUMBER is displayed. infotainment controls. infotainment controls. 3. Turn MODE/O /ENTER to 2. Turn MODE/O /ENTER to 2. Turn MODE/O /ENTER to select a phone number. select PHONEBOOK, and then select MISSED, and then press press ENTER. ENTER. You can enter phone numbers by one digit at a time. The phonebook data is The phone number of the displayed. previous missed call appears Numeric character (0-9) and on the display window. symbols (*, #, +) are available. 3. Turn MODE/O /ENTER to You can use the symbols (+) select the phone number of 3. Turn MODE/O /ENTER to only for the first digit. your choice, and then press select the phone number of ENTER. your choice, and then press y: Advance to the next digit. Select in the following order: ENTER. z: Delete the entered digit and P P CALLING is displayed and a return to the previous digit. Initial Name Phone call is made to the selected number phone number. 4. After entering the phone number, press Off Hook or CALLING is displayed and a You can also make a call by ENTER. call is made to the selected pressing Off Hook. phone number. CALLING is displayed and a When the person receives the call, call is made to the selected You can also make a call by you can talk in handsfree mode. phone number. pressing the Off Hook. Making a Phone Call Using When the person receives the When the person receives the call, Incoming Call History call, you can talk in you can talk in handsfree mode. 1. Press Off Hook on the handsfree mode. infotainment controls. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 125 2. Turn MODE/O /ENTER to The person (phone number or . If there is a private call, select INCOMING, and then name) you called is displayed. UNAVAILABLE is displayed. press ENTER. 3. Turn MODE/O /ENTER to . You can refuse a call by The person (phone number or select the person (phone pressing On Hook when a call is name) who made the previous number or name) of your incoming. incoming call is displayed. choice, and then press . This unit supports the in-band ENTER. ring tone (transfers the ring tone 3. Turn MODE/O /ENTER to CALLING is displayed and a from your phone to the main select the person (phone unit). If the in-band ring tone is number or name) of your call is made to the selected phone number. not supported your phone, the choice, and then press unit use the built-in ring tone. ENTER. You can also make a call by pressing the Off Hook. 1. Press Off Hook and use CALLING is displayed and a handsfree to talk. call is made to the selected When the person receives the call, phone number. you can talk in handsfree mode. 2. When you have finished the call, press On Hook. You can also make a call by Answering a Call pressing Off Hook. Registering a Speed Dial by When your phone set receives a Entering a Phone Number When the person receives the call, call, INCOMING, followed by the you can talk in handsfree mode. person (phone number or name) is Up to six phone numbers and displayed. names can be registered in the Making a Phone Call Using Speed Dial and you can call the Outgoing Call History . If there is a call that has been person in a one-touch operation. 1. Press Off Hook on the registered, the caller’s name is displayed. 1. Press Off Hook on the infotainment controls. infotainment controls. . If there is a call that has not 2. Turn MODE/O /ENTER to been registered, only the select OUTGOING, and then number is displayed. press ENTER. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

126 Infotainment System 2. Turn MODE/O /ENTER to Registering a Speed Dial Number Making a Call Using Speed Dial select ENTER NUMBER, and from a History 1. Press Off Hook on the then press ENTER. You can select a phone number infotainment controls. INPUT NUMBER is displayed. from the incoming (missed call) or 2. Press the Speed Dial of your outgoing call history and register it choice for less than 3. Turn MODE/O /ENTER to for speed dialling. one second. select a phone number. Do not register the phone number 3. Press Off Hook or ENTER. You can enter phone numbers while driving. Park your vehicle in a by one digit at a time. secure location and register it. CALLING is displayed and a call is made to the selected Numeric character (0-9) and 1. Press Off Hook on the phone number. symbols (*, #, +) are available. infotainment controls. You can use the symbols (+) O When the person receives the only for the first digit. 2. Turn MODE/ /ENTER to call, you can talk in select the phone number handsfree mode. y: Advance to the next digit. history of your choice, and then press ENTER. Registering a Name to Speed Dial z: Delete the entered digit and 1. Press Off Hook on the 3. Turn MODE/O /ENTER to return to the previous digit. infotainment controls. select the phone number of You can also select phone your choice. 2. Press the Speed Dial of your numbers from the phonebook. choice for less than 4. Press and hold down the 4. After entering the phone one second. Speed Dial you want to store number, press and hold down in, for more than one second. 3. Press FUNC. the Speed Dial of your choice for more than one second. SAVED is displayed and the 4. Turn MODE/O /ENTER to Speed Dial registration is SAVED is displayed and the select characters. complete. Speed Dial registration is You can enter phone numbers complete. by one digit at a time. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 127 Alphanumeric characters and . Turn counterclockwise: MIC LEVEL is displayed. MIC the following symbols are Decrease the volume. The LEVEL disappears in two seconds available. '< > * + - . / \ = _ adjusted volume value is saved. after the operation is completed, (space) The volume and microphone gain and the display returns to its original state. y: Advance to the next digit. setting of each mobile phone is different according to its Talking on the Mobile Phone z: Delete the entered digit and specification. (Private Mode) return to the previous digit. Setting the Sensitivity of the You can switch phone calls from this 5. After entering the name, press Built-In Microphone unit (handsfree mode) to the mobile ENTER. If your voice is too low or difficult to phone. SAVED is displayed and the hear for the person you are talking Press and hold down the Off Hook name registration to the Speed to, or there is an echo or howling, for more than one second during Dial is complete. you can adjust the microphone a call. sensitivity. Setting the Volume Entering Tone Numbers Press the Level Adjust during a call. Call Volume: Turn Volume Adjust You can transmit tone numbers during a call. y: Increase the sensitivity. (The during a call. sound transmission is more . Turn clockwise: Increase the effective.) 1. Press FUNC during a call. volume. : Decrease the sensitivity. (The 2. Turn MODE/O /ENTER to . Turn counterclockwise: z sound transmission is less select the tone number. You Decrease the volume. The effective.) can enter phone numbers by adjusted volume value is saved. one digit at a time. The setting can be adjusted within Ringtone Volume: Turn Volume the range of zero to MAX (10). Numeric character (0-9) and Adjust during an incoming call. (Default: five). symbols (*, #, +) are available. . Turn clockwise: Increase the You can use the symbols (+) volume. only for the first digit. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

128 Infotainment System 3. Press y. The selected tone This function is available only when DISCONNECT: Disconnect the numbers are transmitted. You your phone is compatible with the registered mobile phone. When will move on to the next step Call Waiting feature. DISCONNECT? is displayed, press ENTER. and select the tone numbers Displaying the Registered Mobile again if necessary. Phone DELETE: Delete the registered Talking During Call Waiting mobile phone. When DELETE? 1. Press FUNC. is displayed, press ENTER. When the display window indicates 2. Turn MODE/O /ENTER to Adjusting the Handsfree Volume the phone call in progress, the Call select BLUETOOTH, and then Waiting feature enables you to press ENTER. 1. Press FUNC. receive and answer a second phone call while placing the first call 3. Turn MODE/O /ENTER to 2. Turn MODE/O /ENTER to on hold. select LIST PHONE, and then select BLUETOOTH, and then press ENTER. Press Off Hook when the ring tone press ENTER. starts during a call. 4. Turn MODE/O /ENTER to 3. Turn MODE/O /ENTER to . While placing the phone call in select mobile phone name, and select HF SOUND, and then progress on hold, you will be then press ENTER. press ENTER. connected to the second caller. 5. Turn MODE/O /ENTER to 4. Turn MODE/O /ENTER to . Press On Hook when you wish select the display item of your select an adjustment item, and to turn off the Call Waiting choice, and then press then press ENTER. feature. ENTER. CALL VOLUME: Adjust the call . When the Call Waiting feature is SELECT: Connect the volume. turned off, you will be connected registered mobile phone. RINGTONE: Adjust the to the first caller on hold. SEARCHING is displayed. ringtone volume. . Pressing the Off Hook again enables you to switch between callers on Call Waiting. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Infotainment System 129 5. Turn the Volume Adjust. 4. Turn MODE/O /ENTER to Trademarks and Turn clockwise: Increase the switch ON/OFF, and then press volume. ENTER. License Agreements Turn counterclockwise: TRANSFER ON: Turn on the FCC Information Decrease the volume. The phonebook transfer. See Radio Frequency Statement adjusted volume value is TRANSFER OFF: Turn off the 0 370. saved. phonebook transfer. To adjust the volume during an Deleting a Phonebook incoming call or during a call, see “Setting the Volume" in this 1. Press FUNC. section. 2. Turn MODE/O /ENTER to Setting the Phonebook Auto select BLUETOOTH, and then Transfer press ENTER. iPod and iTunes may be used with 1. Press FUNC. 3. Turn MODE/O /ENTER to materials without copyright, 2. Turn MODE/O /ENTER to select DEL P.BOOK, and then or materials for which copying or select BLUETOOTH, and then press ENTER. playback are legally allowed for the press ENTER. 4. When DELETE ? is displayed, purposes of private copying or press ENTER. playback. The infringement of 3. Turn MODE/O /ENTER to copyright is prohibited by law. select A.TRANSFER, and then "Made for iPod" and "Made for press ENTER. iPhone" mean that an electronic accessory has been designed to connect specifically to iPod or iPhone, respectively, and has been certified by the developer to meet Apple performance standards. Apple is not responsible for the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

130 Infotainment System operation of this device or its Bluetooth Handsfree performance compliance with safety and can be influenced by mobile phone regulatory standards. network, handset and driving iPhone, iPod, iPod classic, iPod condition. nano, and iPod touch are The functions of the system may be trademarks of Apple Inc., registered partially limited depending on the in the U.S. and other countries. model of your mobile phone. Bluetooth Operation of the portable device via this unit differs depending on the The Bluetooth word mark and logos specifications of the portable device. are owned by the Bluetooth SIG, Inc. and any use of such marks by General Motors is under license. Other trademarks and trade names are those of their respective owners. Compatible Bluetooth Specifications: Bluetooth Specification Ver.2.1 + EDR Compatible Profiles: Hands Free Profile (HFP) Ver.1.5, Phone Book Access Profile (PBAP) Ver. 1.1, Advanced Audio Distribution Profile (A2DP) Ver.1.2, Audio/Video Remote Control Profile (AVRCP) Ver.1.3 Bluetooth Handsfree/Audio operation is subject to mobile phone compatibility. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Climate Controls 131 Climate Control Outlet Selector Knob : The Air Climate Controls Selector Knob regulates air flow Systems from the upper, floor and defroster outlets. Climate Control Systems The heating, cooling, and ventilation Climate Control Systems . . . . . 131 for the vehicle can be controlled H : Air flows through the upper with this system. outlets. Air Vents Air Vents ...... 134 ) : Air flows through the upper and floor outlets. Maintenance 6 : Air is flows through the floor Passenger Compartment Air outlets. Filter ...... 135 Service ...... 136 - : Air flows through the floor outlets, with some air coming from the door window and windshield outlets. Climate Control System w/Air 1 : Air flows through the door Conditioning shown, Heater Only window and windshield outlets. similar Air Selector Lever : The intake of 1. Outlet Selector Knob outside air and the circulation of 2. Air Selector Lever inside air is controlled by sliding this lever right or left. 3. Temperature Control Knob P : Use this position to ventilate 4. Air Conditioning (A/C) Switch, the interior of the cab. This position if equipped should be normally selected. 5. Fan Speed Control Knob Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

132 Climate Controls O : Use this position to prevent heater is being used. To turn off the Set the temperature control knob to dusty or otherwise contaminated air conditioning, push this switch in the desired position. Adjust the fan outside air from entering the cab, again. speed control knob to the preferred such as in a tunnel or in congested When the defrost mode is selected, speed. traffic. the air conditioner compressor will How to Use the Heater be on. Extended use of the inside air Normal Heating : Set the outlet recirculation position causes the Even if the A/C switch is turned on, selector knob to the 6 or - windshield and windows to fog up the air conditioning system will not easily, making visibility poor. For operate when the fan speed control position. Use the - position for good ventilation, switch to outside knob is placed in the stop position. warming your feet while defogging air as soon as possible. Make sure that the fan speed the windshield. Temperature Control Knob : Use control knob is in a position other Set the air selector lever to the P than the stop position. this knob to select the preferred cab position. Adjust the temperature interior temperature. Turn the knob Even in seasons when the air control knob and the fan speed counterclockwise to lower the outlet conditioning system is not used, control knob to the desired air temperature and clockwise to occasionally operate the system for positions. raise it. a few minutes with the engine To dehumidify the cab interior while running at a low speed in order to Fan Speed Control Knob : The fan heating, press the A/C switch to the keep the system's components speed can be adjusted to any of the on position. four speeds available. lubricated. As the heater uses the heat from Air Conditioning (A/C) Switch : Ventilation the engine coolant, its heating effect Press this switch to use the air Outside Air Ventilation : Press the is weak when the engine coolant conditioning system. The indicator A/C switch to the off position. Turn temperature is low. light inside the switch will come on the outlet selector knob to the Maximum Heating : Turn the outlet to show that the air conditioning preferred position. Move the air system is in operation. The air selector knob to the 6 position, set selector lever to the P position. conditioning system can also be the air selector lever to the O used for dehumidifying while the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Climate Controls 133 position, and turn the temperature Defogging and Defrosting the After defrosting, be certain to return control knob fully towards the high Windshield the air selector lever to the P temperature direction. Defogging : Set the outlet selector position. Failure to do so will cause Set the fan speed control knob to knob to the 1 position. Set the air the windshield to fog up, impeding the maximum speed position. forward visibility. selector lever to the P position. Bi-Level Heating : Set the outlet Cooling Turn the temperature control knob selector knob to the ) position. Set to a high-temperature position Normal/Moderate Cooling : This the air selector lever to the P according to your preference. For setting is suitable for extended position. Set the temperature control defogging in the summer months, periods of cooling or moderate knob to the middle position. set the temperature control knob to cooling. Press the A/C switch to the on position. Adjust the fan speed control knob any desired position. as desired. The air from the floor Set the fan speed control knob to Set the outlet selector knob to the outlets is warmer than the air from any speed position, except the off H position for normal cooling or set the upper outlets in this position. position. The A/C compressor it to the ) position for moderate However, when the temperature automatically operates when the 1 cooling. Adjust the temperature control knob is moved to either the position is selected. Defogging is control knob to the desired position. full hot or the full cold position, the performed very effectively with the Adjust the fan speed control knob air from the floor outlets and the air dehumidifying effect. as desired from the upper outlets will be the Defrosting : Set the outlet selector Maximum Cooling : Set the outlet same temperature. This position can knob to the position. Set the air selector knob to the H position. give cool upper level air and warm 1 selector lever to the O position. Press the A/C switch to the on floor level air when the temperature position. Move the air selector lever control is adjusted in between cold Turn the temperature control knob to the O position and hot. This is useful in cool fully towards the high-temperature weather with bright sunlight direction. Set the fan speed control conditions. knob to the maximum speed position. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

134 Climate Controls Turn the temperature control knob Air Vents fully towards the low-temperature direction. Set the fan speed control knob to the maximum speed position. After prolonged parking in direct sunlight, open the windows or doors to ventilate the interior of the cab and release the heat. During cooling operation, mist may come out of the air outlets. This results from quick cooling of humid air, and does not indicate any problem. After maximum cooling, be certain to return the air selector lever to the P position. Failure to do so will cause the windshield to fog up, impeding forward visibility.

1. Driver Side Outlets. Airflow 4. Door Windows Outlet. Air is direction is adjustable. delivered towards the door 2. Windshield Outlets. Air is windows delivered towards the 5. Foot Outlets. Air is delivered windshield. towards the feet. 3. Passenger Side Outlets. Airflow direction is adjustable. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Climate Controls 135 Air Flow Direction Control Lever Maintenance Passenger Compartment Air Filter Removing the Inside Air Filter

3. Remove and clean the filter. Use a vacuum cleaner or the Use the tab to adjust the airflow like to clean dust and dirt from direction from the outlet. To close its surface. the outlet, move the tab fully down. Avoid interference with electric harnesses when removing the filter. In order to avoid filter damage, hard 1. Remove the 2 clips securing brushes should not be used for filter the cover. Remove the clips in cleaning. the order of the inner clip (1) followed by the outer clip (2). 2. Remove the cover by pushing it upwards. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

136 Climate Controls Installing the Inside Air Filter Removing the Outside Air Filter Installing the Outside Air Filter Install the filter in the reverse order Install the filter in the reverse order to removal. to removal. Ensure that the filter is returned Ensure that the filter is returned securely to its original position. securely to its original position. Failure to observe this precaution Failure to observe this precaution can lead to rattling during travel. can lead to rattling during travel. The vehicle must not be used with The vehicle must not be used with the filter removed or incorrectly the filter removed or incorrectly installed. Failure to observe this installed. Failure to observe this precaution can lead to air precaution can lead to air conditioning system damage as a conditioning system damage as a result of dust, dirt and the like result of dust, dirt, water, snow, and entering the system. 1. Remove the filter from under the like entering the system. the instrument panel on the passenger side. While pressing Service in the filter lock, on both sides, pull out the filter. The air conditioning system will not be able to cool the cab interior 2. Use a vacuum cleaner or the effectively if the refrigerant level is like to clean dust and dirt from low. Accordingly, the refrigerant its surface. level must be topped up whenever In order to avoid filter damage, hard necessary. brushes should not be used for filter Please contact your dealer cleaning. whenever refrigerant must be added. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Climate Controls 137 Operation Tips Operating the air conditioning while the refrigerant level is too low leads not only to poor cooling performance but also to air conditioning system damage. This vehicle uses the new refrigerant HFC134a (R134a) in the air conditioning system. No other type of refrigerant can be used. In order to protect the environment, care must be taken to ensure that refrigerant gas is never released into open air. When refrigerant must be replaced, therefore, please contact your dealer or other service facility equipped with a gas recovery installation system. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

138 Driving and Operating Engine Alarm and Automatic Cruise Control Driving and Shutdown ...... 173 Cruise Control ...... 223 Operating Idle Shutdown ...... 174 High Idle System ...... 174 Fuel Engine Checks Before Fuel for Diesel Engines ...... 227 Driving Information Operating ...... 175 Biodiesel ...... 228 Cold Weather Operation ...... 230 Driver Behavior ...... 139 Parking over Things That Burn ...... 176 Water in Fuel ...... 231 Distracted Driving ...... 139 Running Out of Fuel ...... 233 Control of a Vehicle ...... 139 Engine Exhaust Filling the Tank ...... 235 Braking ...... 143 Engine Exhaust ...... 177 Steering ...... 149 Running the Vehicle While Conversions and Add-Ons Driving on Wet Roads ...... 149 Parked ...... 179 Add-On Electrical Hill and Mountain Roads . . . . . 150 Equipment ...... 236 Winter Driving ...... 151 Diesel Particulate Filter Power Take-Off (PTO) ...... 237 If the Vehicle Is Stuck ...... 153 Diesel Particulate Filter ...... 180 Emergencies (Troubleshooting) ...... 154 Diesel Exhaust Fluid Emergencies (Disabled Diesel Exhaust Fluid ...... 189 Vehicle) ...... 164 Automatic Transmission Starting and Operating Automatic Transmission ...... 205 New Vehicle Break-In ...... 165 Selector Lever ...... 214 Pedals ...... 166 Overdrive Off ...... 215 Ignition Positions ...... 166 Brakes Starting and Stopping the Antilock Brake Vehicle ...... 168 System (ABS) ...... 216 Operating Temperature ...... 171 Parking Brake ...... 220 Winter Cover ...... 172 Exhaust Brake ...... 222 Engine Heater ...... 172 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 139

Driving Information Warning (Continued) Warning (Continued) Driver Behavior could get into the cab (for driving and you wish to use a example, a place that is mobile telephone, first stop the Napping in the Vehicle poorly ventilated), you could vehicle in a safe place. suffer carbon monoxide { Warning poisoning. You and others could be seriously injured. . You and others could be Before taking a nap in the vehicle, seriously injured. be sure to shut off the engine and Control of a Vehicle place the ignition in the LOCK position. Otherwise, any Distracted Driving Warnings for Driving unintended contact with the Do Not Use a Mobile Phone accelerator pedal while you are { Warning asleep could cause the vehicle to While Driving move, resulting in a crash. Concentrate on driving safely, . If you leave the engine { Warning obeying all legally designated running and unintentionally speed limits, road signs and Drivers should never use mobile traffic signals. keep the accelerator pedal telephones or car phones in any pressed while asleep, the mode other than Hands Free If you notice any abnormal noise, engine and exhaust pipe while driving. Doing so is abnormal smell or abnormal could become abnormally vibration from any part of the hot, resulting in a fire. dangerous. Using a mobile telephone while driving could vehicle, immediately stop the . If you leave the engine result in a crash because you vehicle in a safe place and running while taking a nap would not be paying full attention perform checks. with the vehicle parked in a to your surroundings. If you are (Continued) place where exhaust gases (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

140 Driving and Operating Pulling Away After Stopping directions, making it hard for you to Warning (Continued) and Parking see ahead. Use glass cleaner to clean the glass and the wiper If a warning light comes on or a Before pulling away, check that blades. buzzer sounds while you are there are no children or obstructions driving, immediately stop the around the vehicle and confirm that Worn wiper blades cannot wipe the vehicle in a safe place and it is safe to pull away. windshield clean and thus cannot perform checks. maintain visibility. When the wiper If you cannot see the area behind blades become worn, replace them Slow down sufficiently when your vehicle well enough to confirm with new ones. approaching a curve. Applying the it is safe to back up, get out of the brakes or sharply turning the vehicle and check behind it. Do Not Attach Accessories to steering wheel while turning the Make it a habit to look around and the Windshield or Windows curve could cause the cargo to confirm that it is safe to pull away shift, the tires to slip and the after a temporary stop (at traffic { Warning vehicle to tip onto its side. lights, for example). Do not attach ornaments, films or Avoid scraping the tire sidewalls If the Windshield Fogs Up other accessories to the against curbstones or driving over Use the heater to blow hot air on the windshield or windows. They dips and protrusions in the road windshield or dehumidify the cabin would impair visibility. Also, any surface. You could damage the using the air conditioner and place plastic suction cups used to tires, resulting in a blowout or the outlet selector knob in the or attach accessories could cause a flat tire. 5 4 position. fire or a crash by acting as You and others could be seriously lenses. Place the air selector lever in the injured. outside air position. You and others could be seriously injured. Nighttime Visibility If there is an old film on the windshield, the lights of oncoming traffic will be reflected in many Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 141 Never Stop the Engine While on valves, , and rings. It also Driving Warning (Continued) causes rapid accumulation of sludge within the engine. indicator lights and other { Warning electrical circuitry would Driving at Night completely stop working. Do not move the engine control Nighttime driving is more dangerous switch away from the "ON" Placing the engine control switch than daytime driving because the position while the vehicle is being in the "LOCK" position while field of view is narrower. Keep your driven. driving would be extremely speed down, and maintain an ample dangerous because the key could headway distance. If the engine stops while the come out, causing the steering vehicle is moving, the brake Metallic Plinking Sound from wheel to lock so that you could booster does not work, and the the Muffler not turn it. brakes would not work properly. Immediately after stopping the The engine could also be You and others could be seriously engine, you may hear a metallic damaged. injured. plinking sound from the muffler. This Stopping the engine while driving sound occurs as the muffler cools would be extremely dangerous Avoid Unnecessary Idling of down and contracts. It does not indicate an abnormality or because the power steering the Engine breakdown. would stop working, making the If the engine idles too long, the steering wheel extremely hard engine coolant temperature will fall to turn. below the operating range. Low Stopping the engine while driving engine operating temperature would be extremely dangerous causes several conditions that are because the warning lights, harmful to engine operation and life. Incomplete combustion of fuel in an (Continued) engine that is not fully warmed-up causes crankcase dilution and forms lacquer and gummy deposits Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

142 Driving and Operating When the Silencer and Refer to Engine Coolant 0 253. directional correction. The vehicle Exhaust Pipe are Hot . Do not put well water, river water may catch strong sidewinds in the or other hard water in the engine following situations: { Warning cooling system. It would hasten . Emerging from a tunnel the formation of rust and scale. When the engine is running and . Driving over a bridge . If foreign matter (insects, mud, immediately after vehicle . Driving on an embankment etc.) gets stuck in the radiator's operation, the DPF, silencer, and air passages, the cooling . Driving through a cutting exhaust pipe are extremely hot. system's performance will Be careful not to inadvertently . Being overtaken by a large truck deteriorate. Check the air or bus touch them when working near passages for clogging, and them (for example, tilting the cab remove any foreign matter using . Overtaking a large truck or bus or operating an attachment). You water under low pressure. Flat Tire and others could be seriously Refer to Exterior Care 0 317. injured. If a blowout or flat tire occurs while When Turning, the Rear you are driving, calmly grip the steering wheel and gradually apply Recommendations for Driving Wheels will Follow Tighter Curves than the Front Wheels the brakes to decelerate. (Hard in Hot Regions braking would be dangerous The engine is more likely to Use the mirrors to confirm safety. because it could cause the steering wheel to be pulled to one side.) overheat in an environment where Sidewinds the ambient temperature is high. To Stop the vehicle in a safe place, and prevent the engine from If the vehicle catches a sidewind change the tire. and drifts sideways, firmly grip the overheating, pay attention to the Hard Bump Under Vehicle following points: steering wheel, decelerate to a speed that allows you to stay If the underside of the vehicle . If the engine does not contain completely in control, and make a receives a hard bump, stop in a safe the appropriate concentration of place where the vehicle will not engine coolant, overheating is obstruct traffic and check for brake likely to occur. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 143 fluid leakage, fuel leakage and acceleration lane. Pay attention ahead of time. Paying attention component damage. If any part of to vehicles behind you and to to vehicles behind you, turn off the vehicle is damaged or broken, conditions in the lane you are the highway smoothly so as not promptly have the vehicle inspected joining. Merge in such a way that to obstruct other vehicles. and repaired. you do not obstruct vehicles in Brake Fade : Frequent use of the the lane. Highways brakes can cause the brakes to . Your sense of how fast you are overheat so that the frictional force . Speeds on highways are higher traveling becomes distorted on of the brake linings decreases and than those on regular roads, so long highway drives. Constantly the brakes become less effective there is more danger. Also, a keep an eye on the than normal. This phenomenon is breakdown on a highway speedometer, and maintain a called brake fade. represents a hazard to other suitable headway distance. vehicles and can cause a crash. Braking Concentrate on safe driving. . During high-speed driving, even Remember to perform daily a little turn of the steering wheel Brake Operation pre-operation inspections and causes a big movement of the use highway driving techniques. vehicle. Turn the steering wheel The brakes give strong braking When performing daily slowly. force with only light pressure on the pedal. Do not press the brake pedal pre-operation inspections, . Excessive use of the brake hard except in the event of an perform the checks shown in the pedal is extremely dangerous emergency. table on the left with particularly because it rapidly wears the great care. brake linings and causes brake Actual stopping distances vary Refer to Owner Checks and fade. Make effective use of the greatly. Your ability to stop safely Services 0 340. engine brake and the exhaust will be greatly affected by the brake when you want to surface of the road, whether it is . When merging with traffic on a decelerate. pavement or gravel; the condition of highway, use the turn signal the road, whether it is wet, dry or When you want to turn off a lights to indicate your intentions . icy; tire tread; the condition of the highway, use the turn signal ahead of time. Speed up brakes; the weight of the vehicle; lights to indicate your intentions sufficiently when you are in the the weight of the load; and the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

144 Driving and Operating amount of brake force applied. time, the amount of force applied to Braking Techniques Please allow for realistic stopping the brake pedal and the speed of For the most effective braking and distances to avoid unnecessary the vehicle. for maximum life from brake system heavy braking. That means better When driving, bear the stopping components, follow these braking, longer brake life and safer distance in mind. Maintain a speed suggestions when possible: driving. and headway distance that allow . Apply the brakes gradually as you to stop safely even if a hazard Stopping Distance road and load conditions permit. occurs. Reduce pedal pressure as Overriding Accelerator with speed drops so that a very light Brakes pressure is used at the end of the stop. In the unlikely event the accelerator pedal becomes stuck, apply the . Do not pump the brake pedal as brakes firmly and steadily to reduce this will only deplete the vacuum reserve or the hydraulic brake The stopping distance of a vehicle engine power and bring your vehicle booster (HBB) accumulator involves reaction time and braking to a safe stop. Turn the engine off, reserve. distance. Deciding to push the move the selector lever to the “P” brake pedal is reaction time. (Park) position, and apply the . To get maximum braking while Applying the brake pedal until the parking brake. In a safe location, maintaining vehicle control, use vehicle comes to a complete stop is inspect the accelerator pedal for any a "squeeze" braking technique. braking distance. Average reaction interference and remove the item Do this by pushing on the brake time is about three-fourths of a causing the interference, if any is pedal with steadily increasing second. But that is only an average. found. If none is found and the pressure. If possible, steer It might be less with one driver and condition persists, have your vehicle around obstacles when there is as long as two or three seconds or towed to the nearest authorized not enough room to stop. more with another. Age, physical dealer. condition, alertness, coordination and eyesight all play a part. Braking distance will vary based reaction Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 145 Brake System Warning Light The exhaust brake should be turned on as soon as service brake Warning (Continued) Caution malfunction is detected. This will slow the engine speed. With the brake linings faster. This may also If brake low vacuum warning light engine speed under control and damage the brakes and will waste (4500HD, 4500XD models), brake providing the grade conditions fuel. It can also result in reduced booster warning light (5500HD, permit, the transmission can be braking performance. 5500XD models), or brake system progressively downshifted using the You and others could be seriously warning light comes on during exhaust brake in each gear. injured. operation, have brake system Eventually the exhaust brake should checked immediately. slow the vehicle to a controllable “crawl.” Gradually pull the parking Applying the Parking Brake brake lever while firmly holding on Except in an emergency, do not Refer to Warning Lights, Gauges, to the steering wheel. Stop the 0 apply the parking brake until the and Indicators 68. vehicle on the side of the road. The vehicle has come to a complete vehicle should not be driven further When the Brakes Do Not Work stop. Applying the parking brake until corrective measures are taken. before the vehicle has stopped can { Warning See Exhaust Brake 0 222 and cause a breakdown. 0 Parking Brake 220. Refer to Parking Brake 0 220. It is very dangerous to suddenly Riding the Brake pull the parking brake lever all the Parking Safely on a Slope way while moving at high speed. { Warning Avoid parking your vehicle on a Reduce speed first by shifting slope as much as possible and down and then gradually pull the "Riding the brake" by resting your choose a level and flat place. If you parking brake lever. foot on the pedal, when you do must park your vehicle on a slope, You and others could be seriously not intend to brake, can overheat be sure to set the parking brake fully. Make sure that the vehicle injured. the brakes and wear out the does not move, and block the (Continued) wheels with chocks for added Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

146 Driving and Operating safety. Also, leave the vehicle in Do Not Forget to Release the gear to further ensure that it will not Warning (Continued) Parking Brake move. Leave the steering wheel Pulling away with the parking brake turned such that the vehicle will be should overheat, as indicated by the engine coolant temperature still applied can damage the brake stopped by an obstruction (for system. example, the curb) in the unlikely gauge, immediate action is event that it moves. required to correct the condition. Before pulling away, make sure the Continued operation of the parking brake is not set by checking Stopping and Parking with the engine, even for a short time, may that the parking brake indicator light Engine Running result in a fire. Do not engage the is not on. exhaust brake while the engine is Be Sure to Have the Engine { Warning idling as this may cause engine Running When the Vehicle is overheating. Moving When parking with the engine running, first come to a complete The diesel particulate filter (DPF) stop, then firmly apply the parking may automatically start { Warning brake, then move the selector regeneration when the vehicle is When the engine is not running, lever to the "P" (Park) position. stopped and parked with the the power steering system does Unless you take these steps, any engine running. To prevent a fire, not work so the steering wheel is unintended pressure on the make sure there is no flammable hard to turn. Also, the brake accelerator pedal could cause a material near the muffler, DPF, booster does not work so there is crash. and exhaust pipe. Be careful not to get burned by hot exhaust little braking ability. If you coast To reduce the chance of personal gases. down a slope without the engine injury and/or vehicle damage due running, you would not be able to to engine overheating, never You and others could be seriously properly control the vehicle and leave the engine idling without an injured. could have a crash. alert driver present. If the engine (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 147 Parking, or Leaving 2. To move the selector lever to brake applied. The risk of knocking Driver’s Seat "P" (Park), hold in the button against the selector lever and on the lever and push the lever causing a crash is particularly great { Danger all the way toward the front of when you move in or out of your vehicle. your seat. It can be dangerous to get out of 3. Turn the key to "LOCK". Driving Down a Long Slope your vehicle if the selector lever is 4. Remove the key and take it not fully in "P" (Park) or the When driving down a long slope, with you. parking brake is not applied all use the exhaust brake together with the way. Your vehicle can roll or 5. Before you leave the driver's the foot brake. Using the exhaust move suddenly. seat, be sure the vehicle is not brake and low-gears reduces the moving, or check that your work load on the foot brakes and To be sure your vehicle will not vehicle is in Park by trying to yields greater braking force. Even move, even when you are parking pull the selector lever out of "P" so, use the foot brakes on level ground, follow the steps (Park) by pulling the selector appropriately to prevent the engine below. (If you have to park on a lever toward you without over-revving. hill, also turn your front wheels so pushing the button. If you can Frequent use of the foot brakes can the vehicle will roll away from do this, it means that the cause vapor lock and brake fade, traffic.) selector lever was not fully resulting in reduced brake locked into "P" (Park). You and others could be seriously effectiveness. injured or killed. Do Not Touch the Selector Lever Brake Fade : Frequent use of the While the Vehicle is Stationary brakes can cause the brakes to with the Engine Idling 1. Hold the regular brake pedal overheat so that the frictional force down with your right foot and Do not touch the selector lever while of the brake linings decreases and apply the parking brake all the the vehicle is stationary with the the brakes become less effective way before shifting the engine idling. If you touch the than normal. This phenomenon is transmission. Follow the selector lever at this time, a gear called brake fade. Parking Brake instructions in could be selected and the vehicle this manual for your vehicle. could move even with the parking Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

148 Driving and Operating Vapor Lock : If the brakes overheat Brake Effectiveness When the due to frequent use, the heat can { Warning Vehicle Has Been Driven on a cause the brake fluid to boil so that Flooded Road or Washed air bubbles are created in the brake To reduce the risk of personal fluid. Pressing the brake pedal injury, before going down a steep simply compresses the air bubbles; or long grade, reduce speed, turn { Warning pressure is not transmitted to the on the exhaust brake and shift the transmission to the next lower When the vehicle is driven on a wheel cylinders, so the brakes' flooded road, parked on a flooded effectiveness sharply deteriorates. gear. This will help control your road or washed, water can get This phenomenon is called speed. Do not hold the brake vapor lock. pedal down too long or too often into the brakes and reduce their while going down a steep or long effectiveness. If the brakes do not Even so, you should be very careful work well afterward, drive slowly when using engine braking in a low grade. This could cause the brakes to get hot and not to work and gently press the brake pedal gear because the engine is likely to several times until the brakes dry over-rev. as well. As a result, the truck will 0 not slow down at the usual rate. out and start working normally. See Exhaust Brake 222 and Always do this after driving Selector Lever 0 214. Failure to take these steps could result in loss of vehicle control. through water or washing the Do not adjust the exhaust brake vehicle to help reduce the risk of valve. You and others could be seriously personal injury. Before parking injured. The engine should never be allowed the vehicle in winter, press the to exceed the governed speed. brake pedal several times in the Supplement the exhaust brake with same way to get rid of moisture in vehicle service brakes intermittently the brakes. Otherwise, the and/or shift to higher transmission moisture in the brakes may freeze gear to prevent engine overspeed. and make the vehicle immovable. A rule of thumb for gear selection is You and others could be seriously that the vehicle should be driven injured. down a grade in the same gear that would be used to climb that grade. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 149 If the vehicle must be driven on a Steering Steering Wheel flooded road or is parked in an area If the steering parts have excess that becomes flooded, promptly Do Not Leave the Steering play or looseness or if any abnormal perform a check for the following Wheel Fully Turned for a condition is noted, have the steering points: Long Time system checked immediately. . Effectiveness of the brakes . Water-ingress or damage to { Warning Driving on Wet Roads drum brakes, disc brakes If you leave the steering wheel Driving on Slippery Surface or . Engine damage due to fully turned for a long time, the oil Driving in Bad Weather (Rain, water-ingress in the power steering oil pump will Icy Roads, Snowy Roads, etc.) . Shorting of electrical become extremely hot. This would cause poor lubrication, oil In bad weather, visibility is reduced components and slippery road surfaces increase tank damage and seal stopping distances. Drive more . Oil level and degradation deterioration, leading to power (cloudiness) of the engine, slowly than you would in good steering oil pump damage, power transmission, differential weather. Also, avoid sharp turns of steering unit damage and power the steering wheel and hard . Greasing of each components steering hose damage. As a braking. Use engine brakes together (lubrication) result the steering wheel could with the foot brakes to decelerate. become extremely hard to turn and a fire or a crash could occur. Using the exhaust brake on a slippery road surface could cause You and others could be seriously the tires to slip. injured. You may not realize the surface is slippery until the vehicle is skidding. Learn to recognize warning clues— such as enough water or ice on the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

150 Driving and Operating road to make a "mirrored surface"— Hill and Mountain Roads and slow down when there is any doubt. Narrow or Congested Roads There is a risk of hydroplaning, When passing or overtaking a particularly where water tends to vehicle on a narrow mountain road collect on the road surface. Drive at or on a narrow or congested urban speeds that allow you to stay in road, pay careful attention to complete control. obstacles on either side and to the If you cannot avoid driving on a condition of the shoulder of flooded road, first check the depth the road. of the water and then drive through When turning, the rear wheels will the water at a slow, constant speed. follow tighter curves than the front There is a risk that water will get wheels. Use the mirrors to confirm Drive at a speed that does not into the engine's cylinders and safety. cause the tachometer needle to cause engine damage (water enter the red zone. Driving Uphill or Downhill hammering). Keep your speed Uphill down, and drive with great care. Downshifts are performed for two main purposes: Shift down well ahead of time in Hydroplaning : If a vehicle is driven order to avoid a heavy load to the at high speed on a road that is . For engine braking on a steep engine. covered with water, a layer of water and/or long downward slope can form between the tires and road Downhill . For responsiveness and surface, causing the tires to lose economy on an uphill slope . Be careful not to drive too fast their grip and slide across the water. on a downhill road. This phenomenon is called hydroplaning. It is dangerous . Use the same gear(s) that you because it makes the steering used to drive up the hill. Also, wheel and brakes useless. use the exhaust brake in order to avoid going too fast. Refer to Wheels and Tires 0 295. . Do not let the engine overrun. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 151 . When going down on a steep Overrunning : An engine overrun is When Ice Prevents You from slope, avoid driving the vehicle an engine-speed increase that Putting Your Key in the Door backward as much as possible. causes the tachometer needle to or Opening the Door Drive it forward slowly on the enter the red zone. It is dangerous down slope. because it can cause engine failure. If you try to force the key into the door, you could bend it. And if you . Compared with forward Winter Driving try to pull the door open with undue movement, the braking distance force, the rubber seal around the of backward movement is longer, Recommendations for Driving door could come unstuck or become and the steering response of in Cold Regions damaged. Use warm water to melt that is worse. the ice, then quickly wipe it away The following recommendations . If you must drive the vehicle and open the door. apply to snowbound regions and to backward, drive it very carefully If the wipers, electric door mirrors, and gradually by moving and mountainous regions, ski resorts and other areas of extreme cold or power windows freeze up, also stopping repeatedly in order to use warm water to melt the ice and stop it any time. and/or snowfall. Please follow them also for reference in winter in other then operate the system. Otherwise, Engine Brake : Engine brake is the regions. you could damage the mechanism braking effect that occurs when you and drain the battery. After that, release the accelerator pedal while For the sake of your vehicle, make wipe the water away. the winter preparations described in driving. The lower the gear, the Before Driving in Cold Regions stronger the engine brake. the links below. Also have these preparations made before driving to Getting In and Out of the Vehicle Exhaust Brake : The exhaust brake a cold region. is a system that closes the exhaust The step can get icy in cold regions. See Engine Oil 0 245. pipe and uses the force of the Be careful not to slip when getting in exhaust emissions to enhance the See Engine Coolant 0 253. and out of the vehicle. effectiveness of engine brake. See Washer Fluid 0 262. See Battery - North America 0 269. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

152 Driving and Operating Before Sitting in the Driver’s Seat scraper, you can remove the snow Use engine brakes together with the Remove snow and ice from your and frost without scratching the foot brakes to decelerate. Using the shoes when getting into the vehicle. glass. At this time, check whether exhaust brake on a slippery road If you try to drive with snow on your the wiper blades are frozen onto the surface could cause the tires to slip. glass. shoes, your shoes would slip on the Pay Attention to the Way the pedals and you would not be able to Also, look under the vehicle and Steering Wheel Turns and Feels press the pedals properly, meaning remove any lumps of ice that are On snowy roads, water and snow that your driving would be stuck to the underbody. Be careful splashed up by the tires can freeze inconsistent. Also, the cabin could not to damage components. and accumulate inside the fenders, become more humid, causing the glass to fog up. Driving on Snowy or Frozen making the steering wheel hard to Roads turn. From time to time, get out of Check Fuel Level the vehicle and remove any On slippery roads, never accelerate accumulated snow. Fuel consumption increases when rapidly, brake hard, decelerate tire chains are used. Determine how rapidly or make sharp turns of the Check the Brakes from Time much fuel you need to reach your steering wheel. to Time destination and fill up the tank in When the vehicle is driven or advance. Refer to Fuel for Diesel There is a risk of reduced grip parked on a snowy surface, ice can Engines 0 227. between the tires and road surface and of increased braking distances. form on the brakes, decreasing their Removing Snow from Glass The danger of icy road surfaces is effectiveness. From time to time and Underbody particularly great on bridges, in while you are driving, press the shady places and where there are brake pedal lightly and check the Do not use a sharp implement to puddles. effectiveness of the brakes. Pay remove snow. Sharp edges could attention to vehicles both ahead of Keep your speed down and be sure damage rubber parts. and behind you when checking the to use tire chains or winter tires on brakes in this way. To maintain an adequate field of snowy or frozen road surfaces. view, use a plastic scraper to Also, check the effectiveness of the remove snow and frost from the brakes as soon as possible when glass surfaces. By using a plastic starting to drive the vehicle after it Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 153 has been parked. If the brakes do . Do not use a sharp implement to not work well, drive slowly and { Warning remove snow. Sharp edges gently press the brake pedal several could damage rubber parts. times until the brakes dry out and If you park in a place where there Refer to Antilock Brake System start working normally. is a lot of snowfall, snow (ABS) 0 216. accumulating around the vehicle Parking in Cold Regions could limit ventilation. Running Remove snow that has stuck to the inside of the fenders and to the When snow collects around the the engine with the vehicle in these conditions could cause brake hoses. Otherwise, it may wheels and the lights, try to remove damage components. After driving exhaust gases to enter the cabin, it before night falls. on a salted road, wash the resulting in carbon monoxide Do not apply the parking brake in underside of the vehicle as soon as poisoning. Take preventive action extremely cold weather, such as in possible to prevent the salt from by, for example, clearing the snow temperatures or at below 0 °C (32 ° causing rust. Spraying water under F). If you leave the parking brake around the vehicle. high pressure is an effective way to applied, the wires and brake shoes You and others could be seriously get the salt off. could freeze up, making it injured. After washing the vehicle, wipe the impossible for you to release the door openings dry. parking brake. Be sure to park the vehicle in gear. Do not park under trees or under the eaves of a building. Chunks of If the Vehicle Is Stuck Be sure to put chocks against the ice could fall on the vehicle if you tires. park in such a place. When Driving on Bad Roads Whenever possible, park in a Cleaning the Vehicle after Caution garage to help prevent parts from Driving on Snowy Roads freezing up and to help make the Do not spin wheels faster than engine easy to start. . The vehicle speed sensors are fitted on the wheels. When 32 km/h (20 mph) in mud, sand, removing snow, ice, and other snow, ice, or other poor road incrustation, take great care not (Continued) to damage the components. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

154 Driving and Operating wheel. Such actions could get the vehicle (even a small fault) to Caution (Continued) vehicle stuck and make it difficult to prevent it from becoming more get out. serious. If a symptom shown in the conditions. Damage may result following table occurs, perform from excessive wheel spinning, After driving through deep mud: any mud stuck to the vehicle can harm inspections and take corrective including tire, transmission, and/ action in accordance with the table. or rear axle malfunction. the steering, brakes and powertrain. Wash the vehicle and remove all If you are unable to perform a If the vehicle gets stuck and it is mud and other debris. repair, the corrective action shown difficult to get out, immediately in the table does not eliminate a The vehicle speed sensors are fitted stop driving and have the vehicle symptom or you cannot locate a on the wheels. When removing mud towed. fault, contact the nearest dealer. and other debris, take great care not to damage the components. Any item for which there is a 4 in the "Corrective action" column If the vehicle gets stuck in sand, Do not use a sharp implement to mud, snow or ice, move the selector requires repairs and adjustments. remove mud. Sharp edges could Contact the nearest dealer. lever from 2 to the R position. Apply damage rubber parts. a light pressure to the accelerator pedal while the transmission is in Refer to Antilock Brake System gear. Remove your foot from the (ABS) 0 216 and Exterior Care accelerator and press the brake 0 317. pedal while shifting. Do not race the engine. For best traction, avoid Emergencies spinning the wheels. When you (Troubleshooting) cannot avoid driving through deep mud, using tire chains is an effective Troubleshooting way to avoid getting stuck. Performing regular inspections and When driving in sand or mud, avoid maintenance prevents damage. Be hard braking, sudden acceleration, sure to perform inspections and and sharp turns of the steering maintenance at regular intervals. Also, quickly rectify any fault in the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 155

Symptom Cause Corrective Action Reference See Battery - North Discharged batteries Recharge or replace America 0 269 Battery terminals After repairing corroded detached, loose, section, connect the - or corroded terminals firmly Engine does not Starter does not Starter ground wire After repairing corroded start turn over, or weak terminal detached, section, connect the - loose, or corroded terminals firmly Engine oil viscosity Change to an oil with See Engine Oil too high proper viscosity 0 245 Starter or electrical 4 - system is faulty Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

156 Driving and Operating

Symptom Cause Corrective Action Reference Make sure there are no No fuel fuel leaks, and then - add fuel See Running Out Air in the fuel system Bleed fuel system of Fuel 0 233 Fuel filter clogged 4 - Engine does not Starter turns over start Warm fuel pipe with hot Fuel is frozen water or wait until it gets - warmer Common rail system is 4 - faulty Preheating system is 4 - faulty Idling speed too low 4 - Fuel filter is clogged 4 - Air cleaner is clogged 4 - Engine starts, but immediately stops Common rail system is 4 - faulty Fuel system is faulty 4 - Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 157

Symptom Cause Corrective Action Reference See Running Out There is water or air in Drain water from fuel of Fuel 0 233 or Unsteady engine speed the fuel system filter or bleed the system Water in Fuel 0 231 Fuel system is faulty 4 - Engine not sufficiently Allow the engine to - warming up warm up See Engine Oil Too much engine oil Correct the oil level 0 245 Engine Control system 4 - faulty Fuel system faulty 4 - White exhaust smoke Exhaust injector 4 - With the vehicle stationary in a place Continuous idling for a where it will not obstruct long period (more than traffic, hold down the - two hours) accelerator pedal and check that white smoke is not emitted Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

158 Driving and Operating

Symptom Cause Corrective Action Reference Engine Control system 4 - faulty The air cleaner clogged 4 - Fuel system faulty 4 - Black exhaust smoke Exhaust system clogged 4 - Exhaust injector 4 - Diesel particulate filter 4 - (DPF) faulty Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 159

Symptom Cause Corrective Action Reference See Engine No engine coolant Add engine coolant Coolant 0 253 Front of radiator is Wash clean with tap See Exterior Care clogged with dirt water 0 317 Make sure it is firmly Radiator cap not tightened or replace the - sufficiently tightened radiator cap Engine is overheating Adjust the tension or See Engine Drive Fan belt loose replace the belt Belt Routing 0 363 Engine coolant dirty 4 - Fan clutch is faulty 4 - Radiator cap dirty or Clean or replace - faulty Improper engine oil Change to an oil with See Engine Oil viscosity proper viscosity 0 245 See Engine Oil Engine oil level too low Add engine oil 0 245 Oil pressure is low Engine inner 4 - components are faulty Meter, indicator/warning 4 - lights or switches faulty Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

160 Driving and Operating

Symptom Cause Corrective Action Reference Parking brake not fully Make sure it is fully - released released Brake dragging 4 - Air cleaner clogged 4 - Fuel filter clogged 4 - Not enough engine power Engine control system 4 - faulty Common rail system 4 - faulty Engine faulty 4 - DPF clogged 4 - Drum-to-lining gap too 4 - large Brakes not effective Air in brake fluid 4 - Brake system failure 4 - Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 161

Symptom Cause Corrective Action Reference Unbalanced air pressure Adjust to proper air See Wheels and in tires pressure Tires 0 295 See Wheels and Tire unevenly worn Replace tire Uneven braking Tires 0 295 Drum brake out of 4 - adjustment Poor wheel alignment 4 - The electrical system is Exhaust brake not working 4 - faulty Loaded too far forward Load properly - See Power Power steering fluid level Add fluid Steering Fluid Steering wheel hard to turn too low 0 262 Insufficient air in front Adjust to proper inflation See Wheels and tires pressure Tires 0 295 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

162 Driving and Operating

Symptom Cause Corrective Action Reference Wheel studs and nuts Tighten to the specified See Wheels and loose torque Tires 0 295 Unbalanced inflation Adjust to proper inflation See Wheels and Excessive play in the steering wheel pressure in the tires pressure Tires 0 295 Unbalanced tires 4 - Excessive steering 4 - wheel free play Poor lubrication in the Lubricate the - Poor steering wheel return steering mechanisms mechanism Poor wheel alignment 4 - Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 163

Symptom Cause Corrective Action Reference See Automatic Insufficient Add oil Transmission Fluid transmission oil From the 0 251 transmission Transmission inner 4 - components faulty See Rear Axle (Gear Oil Viscosity Insufficient differential Add oil Chart) 0 271 or gear oil Loud or abnormal From differential Rear Axle (Oil noises Level Check) 0 272 Differential inner 4 - components faulty From the Spring pins, shackles, 4 - suspension or stoppers worn Poor lubrication in each See Owner Checks Lubricate them From the driveshaft component and Services 0 340 Splines or bearings worn 4 - Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

164 Driving and Operating Emergencies (Disabled When the Vehicle Breaks Down { Warning Vehicle) During Driving Vehicle operations will change, so 1. Use the hazard warning flasher When the Vehicle stop the vehicle in a safe place any time to warn other drivers, Breaks Down with the following in mind. day or night, and pull the vehicle immediately over to a When the Vehicle Stops While The power steering system will safe place that does not Driving not work so the steering wheel impede traffic (shoulder). Place The brake booster will no longer will be hard to turn. It will require triangle reflectors to alert other operate and brake effectiveness will more strength than during normal traffic to the presence of your be reduced. If the engine cannot be operation. vehicle. started, promptly have the vehicle As the brake booster will no 2. If the vehicle can be exited inspected and repaired. longer be functional, brake safely, have the other If the engine stopped because the effectiveness will be greatly passengers get out and wait in vehicle ran out of fuel while driving, reduced. Be sure to apply more a safe place. refueling alone will not be enough to pressure than usual to the brake 3. If the vehicle can be exited restart the engine. Bleed the fuel pedal. safely, walk to a safe place and system after refueling the vehicle. If the power assist steering take appropriate measures by When the Fuel Tank is Empty system goes out because the using the closest telephone, etc. See Running Out of Fuel 0 233. engine has stopped or the assist system has malfunctioned, the See Hazard Warning Flashers 0 94. When the Engine Stalls and vehicle can still be steered. Cannot Be Restarted However, much greater effort is Move the selector lever to the "N" needed, especially in sharp turns position and push the vehicle to a or at low speeds. safe place. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 165 If There is a Fuel Leak Starting and . Use the correct gear to maintain the desired road speed without { Danger Operating lugging the engine. . Avoid racing the engine, Leaking fuel from the vehicle is New Vehicle Break-In full-throttle starts and aggressive dangerous due to possible Good vehicle care begins with application of brakes when combustion or explosion. Stop the proper break-in. While every new stopping. engine immediately. vehicle goes through rigid factory . Keep tires properly inflated for You and others could be seriously and dealer inspection and tests the load carried. injured or killed. before delivery, the care you give your vehicle during the initial . Check lubricant levels in the break-in period can pay off in longer engine and transmission weekly. life, better performance and more . Keep speeds below 80 km/h economical operation. (50 MPH) for the first 800 km It is therefore always recommended (500 miles). that during the initial 1 000 km . Use the lowest gear ratio (600 mile) break-in period, the available when starting a loaded following few simple precautions are vehicle and when climbing carefully observed. slopes to avoid lugging the Follow the recommendations listed engine. below: . It is recommended that the . Warm up the engine by driving engine speed is restricted to easily for the first few minutes 2,300 r/min. before placing it under load. . Do not drive for extended periods at any one constant speed, either fast or slow, during the first 800 km (500 miles). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

166 Driving and Operating Mechanical Driveshaft Brake Pedals Burnish Procedure { Warning It is recommended that the A can or bottle rolling on the floor driveshaft mounted parking brake may prevent brake pedal be burnished as part of the new operation if it is caught under the vehicle break-in procedure. pedal. This is very dangerous. Increased parking brake A floor mat must be placed performance will result when the correctly. An incorrectly installed parking brake is burnished as floor mat may hinder the free specified below: movement of each pedal. You . Make 10 moderate stops, using and others could be seriously the hand brake, from 16 km/h injured. (10 MPH) while spacing the stops a minimum of 4 km (2.5 miles) apart. Sit in a correct driving position on Ignition Positions the seat and operate the brake . Operate the vehicle at 32 km/h Engine Control Switch (20 MPH) between stops. pedal (1) and accelerator pedal (2) with your right foot. To avoid accidentally pressing the wrong { Warning pedal, check the pedal positions and practice putting your foot on the While driving, never turn the desired pedal. engine control switch to the LOCK position. The key could be removed from the switch, which then locks the steering wheel. This is extremely dangerous. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 167 control switch in the LOCK position, Caution press and hold the key in the ACC position and then turn it to the After starting the engine, do not LOCK position. If you will leave the turn the engine control switch to vehicle, remove the key and turn the the START position. Otherwise, steering wheel until it locks. The the starter motor may be steering wheel will be locked to help damaged. prevent theft. Using electrical devices such as 2 ACC : Accessory is in the first the audio system for an extended position clockwise. In this position, time period with the engine the audio and other accessories can stopped can completely discharge be used with the engine stopped. the battery. 3 ON : This ON position is in the second position clockwise. The key The starting circuit, engine alarm stays in this position while the circuits and accessory circuits are engine is running. Engine control, all controlled by the engine control warning circuits, gauge circuits, and switch. accessory circuits are energized. The engine cylinder heaters or glow plugs are also turned on when the switch is in the ON position. The wait-to-start light will come on and stay on until the glow plugs are heated enough. When this light goes off, turn the switch to the 1 LOCK : Lock is in the position START position. fully counterclockwise. In this position, the key can be inserted or removed. To place the engine Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

168 Driving and Operating 4 START : On all engines, start is in around the vehicle. Take off the the position furthest clockwise. The chocks after confirming that the Warning (Continued) engine is started in this position. parking brake is securely applied. Turn the key against spring also essential to lay floor mats Sit behind the wheel, adjust the seat properly. Incorrectly installed floor pressure to energize the starter. position, and buckle up the seat When key is released, spring mats would hinder free movement belt. The passengers are also of the pedals. pressure returns it to the ON required to buckle up the seat belts. position. Release the key as soon Do not use the dashboard pocket as the engine has started. Adjust the positions of the steering or the top of the dashboard as a wheel and mirrors. Lock the doors. place to put items that could roll, If the key cannot be turned from the Turn the power of the dome light or which could interfere with your LOCK position to the ON position, accessories OFF before starting the lightly move the steering wheel engine. See Seat Position 0 38, driving. You and others could be clockwise and counterclockwise Seat Belts 0 43, Steering Wheel seriously injured. while trying to turn the key. Adjustment 0 65, and Mirrors 0 33. Keep the Floor Around the Choose Your Footwear Suitable Starting and Stopping the for Driving Vehicle Driver's Seat Clean and Tidy Check around the Vehicle before { Warning { Warning Starting the Engine It is extremely dangerous to have Choose footwear that ensures Proper care and operation will not proper operation of pedals when only extend the service life of your empty cans, empty bottles or other items rolling around on the driving the vehicle. Use of vehicle but also improve fuel footwear unsuitable for driving economy. floor because they could get trapped under the brake pedal may cause an accident. Before pulling away, perform a and prevent brake application. thorough safety check, making sure For proper pedal operation, it is there are no children or obstructions (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 169 Starting the Engine It is normal for the vacuum warning Do not keep the engine control buzzer to sound for a few seconds switch in the START position for after the engine has started. more than about 10 seconds. After the engine has started, check Operating the starter for too long to be sure the selector lever is still might cause starter and battery in the P position. failure or may result in overheating. 2. When the engine control switch is turned to the ON position, This engine has an automatic When the engine does not start, the wait-to-start light comes on warm-up system that increases wait for 20 to 30 seconds and then and it goes out in about engine idle speed and applies the turn the engine control switch again. 1 second when the engine is exhaust brake. Allow sufficient time Before starting the engine sit in the warm, to about 10 seconds to let the engine circulate lubricant driver seat, check that the parking when the engine is cold. oil before driving. This usually brake is firmly engaged, the selector requires 30 seconds to 2 minutes 3. After confirming that the depending on ambient conditions. lever is in the P or N (P is preferred) wait-to-start light has gone out, position and the shift indicator also See Brake System Warning Light turn the engine control switch (Parking Brake Light) 0 74. shows P or N, and firmly press the to the START position to start brake pedal to start the engine. the engine. Release the engine The turbocharged engine should be When stopped on a slope, start the control switch as soon as the started in a way which ensures the engine with the selector lever in the engine starts. bearings supporting the rotating parts of the turbocharger are P position. See Ignition Positions 4. Do not crank the engine for 0 166. sufficiently lubricated. Do not race a more than 10 seconds at a cold engine. 1. Make sure that the selector time. If the engine does not lever is in the P or N position start, wait 20 to 30 seconds At low ambient temperatures, a cold and firmly press the brake with the engine control switch engine may emit more smoke than pedal. in the LOCK or ACC position usual. before trying to start again. Do not drive the truck until the engine has had sufficient time to circulate the lubricant oil. This Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

170 Driving and Operating usually requires 30 seconds to Cold Weather Starting Maintenance Items to Aid Cold 2 minutes depending on ambient If you plan ahead for cold weather, Weather Starting conditions. This will help reduce starting and driving your vehicle Since the basic principle of diesel white start-up smoke. should be no problem. The following engine ignition is based on Preheating : Diesel engines are tips will help ensure good starting in compression, the diesel engine is compression ignited, which makes cold weather. somewhat harder to start than a them difficult to start when they are Oil gets thicker as it gets colder, gasoline engine when the cold because the compression which slows down the engine temperature is below freezing. alone cannot create a temperature cranking speed. The diesel engine To help prevent hard starting high enough for fuel to ignite. functions by the heat of problems, special attention should Preheating means warming the compression (and glow plugs when be given to following normal compressed air inside the cold), rather than through the use of maintenance items: combustion chambers to facilitate spark plugs as in a gasoline engine. 1. Neglecting to have the fuel engine starting. Be sure to start the So, your engine must crank faster filter and water separator engine after the wait-to-start light than a gasoline engine before it will serviced can be one of the has gone out. start. major contributors to hard Start : Do not press the accelerator To be sure the engine can turn fast starting. If water is permitted to pedal at the engine start. The enough to start, use SAE 10W-40 accumulate in the primary filter, accelerator opening degree at the viscosity engine oil when prevailing it will freeze and make starting engine start is electronically temperatures drop below 0 °C the engine impossible. controlled. (32 °F). See the oil quality and oil 2. Make sure the fuel tank vent Warm-up : Do not race the engine viscosity recommendations. Using is open. to speed warm-up. the proper viscosity oil will make starting easier down to -23 °C (-10 °F). When prevailing temperatures drop below -23 °C (-10 °F), the heater may be needed for starting. See Engine Heater 0 172. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 171 3. Always refuel at the end of a Do not shut down the engine the required levels. If there is day's operation. Moisture will immediately after driving the vehicle. insufficient oil, it will not adequately condense in an empty tank; Otherwise, a seizure or other reach and lubricate components, therefore, the tank should be failures may result. and a breakdown will result. filled before leaving the vehicle To prevent the battery from going Start the engine and allow it to idle standing for an extended dead, turn the engine control switch for at least five minutes. Check for period. to the ACC or LOCK position after abnormal noises. Do not use starting aids in the air stopping the engine. If you leave the For instructions on warming up the intake system. Such aids can cause vehicle for an extended period of engine, refer to “Starting the Engine” immediate engine damage. See time, place the engine control switch previously in this section. Fuel for Diesel Engines 0 227. in the LOCK position. If one year has passed since the Stopping the Engine Let the engine idle for 3 minutes diesel exhaust fluid (DEF) in the before shutting off the engine. This DEF tank was added, the DEF in When stopping the engine, take the allows the turbocharger to slow following steps: the tank should be replaced. Be down while keeping the bearings careful not to inhale the ammonia 1. Bring the vehicle to a lubricated. odor when replacing the DEF. Also, complete stop. If the Vehicle Has Not Been Used please contact your nearest dealer 2. Firmly apply the parking brake. for a Long Period about the replacement work. 3. Move the selector lever to the If a diesel vehicle has been P position and make sure that standing for an extended period of Operating Temperature the shift indicator shows P. time, the turbocharger bearings Recommendations for Warming 4. Allow the engine to idle for should be pre-lubricated prior to Up the Engine approximately 3 minutes. starting. See your authorized dealer for more detailed information. The engine is sufficiently warmed 5. Turn the engine control switch up when the needle of the engine to the ACC or LOCK position. Before using a vehicle that has not coolant temperature gauge starts been driven for a long period, check to move. the engine and transmission for oil leakage, and make sure the oil is at Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

172 Driving and Operating Do not race the engine or quickly when the pedal is released. accelerate before the engine has Warm-up is automatically cancelled Warning (Continued) sufficiently warmed up. Oil would entirely after the engine coolant not have adequately reached and temperature rises above 65 °C loading of the blades as they lubricated components, and a (149 °F). pass by the masked area breakdown may result. followed by the unmasked area. Winter Cover After the fan has been fatigued, it The exhaust pipe becomes may suddenly break apart while extremely hot while the engine is . Do not cover the front of the rotating, possibly causing idling. Before warming up the radiator with newspapers, personal injury to anyone engine, make sure there is no cardboard or any other standing nearby, and equipment flammable material, such as grass, flammable material to raise the damage. You and others could be waste paper, oil, or old tires near the engine coolant temperature. exhaust pipe. seriously injured. . If you allow the engine to warm Engine Warm-up System up but the engine coolant Engine Heater During cold ambient conditions, the temperature does not rise, have automatic engine warm-up system the nearest dealer inspect the Engine Block and Oil Pan Heater thermostat. operates to reduce engine warm-up If the vehicle is parked in a garage, time during idling. Radiator Grille Covers the block and pan heaters should Automatic Engine Warm-up : not be needed until the garage When the engine is idling with the { Warning temperature drops below −23°C engine coolant temperature below (−10°F) regardless of outside 62 °C (144 °F), the engine warm-up Radiator shutters, winter fronts, temperature. system automatically closes the or grille covers are not to be used exhaust brake and increases engine and may cause the engine's idle speed so that the engine is radiator cooling fan to fatigue warmed more quickly. Warm-up is from the alternate unloading and cancelled when the accelerator (Continued) pedal is pressed, and resumed Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 173 The engine block and oil pan If the cord is too short, use a heavy If the system senses any of the heaters are designed to warm the duty, three-prong extension cord. Do following conditions: high engine block and oil pan areas that will let not use an extension cord such as temperature, low engine oil pressure the engine run faster. To use the you would use for a lamp, because or low engine coolant, the heaters: the cord may overheat. corresponding warning light and 1. On single cab vehicles, tilt The engine should go through a engine alarm (shutdown) warning the cab. warm-up period to warm up the light will come on. If the engine engine oil before placing engine alarm (shutdown) warning light 2. Unwrap the electrical cord and comes on, you will also hear a tone remove the protective cap. under load. This will ensure proper lubrication of the engine. See Cab alarm. 3. Plug the cord into any Tilting 0 243. If your vehicle has the engine three-prong 110 volt outlet shutdown feature, your engine will (normal household current). Engine Alarm and shut down in 30 seconds. It may require several hours to sufficiently heat the engine. Automatic Shutdown Pull safely off the road and shut off Outside temperature, oil the engine. Do not start it until the viscosity, etc., will affect how cause of the problem is known, and long the block and oil pan the problem is fixed. However, if the heater should remain plugged engine shuts down when you are in. Contact your dealer for the still in traffic, you can restart the conditions in your area. engine and get another 30 seconds of operation. Do this only if you 4. After using the heater(s), be have to, since there is a problem sure to restore the cord that can harm the engine if it is not properly, to help keep it away fixed. See Engine Shutdown from moving engine parts. Warning Light 0 80. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

174 Driving and Operating Idle Shutdown High Idle System Idle Stop is a dealer programmable Use high idle mode to increase function which will automatically turn engine idle speed to 1,200 r/min off the engine, at idle, when specific when the vehicle is stationary. programmed conditions are met. See your dealer for details. When the Idle Stop light comes on, it alerts you that programmed conditions have been met and the engine is about to shut down. This light stays on after the engine has stopped. This indicator light will come on when the engine control switch is turned to the ON position and then should go out after approximately 3 seconds. If the idling stop function does not initiate, a transmission related problem may have occurred. Please Activating High Idle Mode contact your dealer. (There is a Follow the below procedure to Diagnostic Trouble Code (DTC) that activate the high idle mode: inhibits the idling stop function when the Service Transmission Warning 1. Set the parking brake. Light is not illuminated). 2. Set the selector lever in P (Park) or N (Neutral) position. 3. Do not press the brake pedal. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 175 4. Press the cruise control main The cruise set indicator light will does not go out or comes on switch to set it to ON. At this stop flashing and the engine speed during normal operation, have time, the operation indicating will return to normal. the charging system checked. light will turn to green. 4. Check that the brake low 5. Turn and hold the cruise Engine Checks Before vacuum warning light is out control set switch in the SET Operating and that the vacuum buzzer is position. After approximately not sounding. It is normal for 3 seconds the cruise control Checks Before Operating the warning buzzer to sound set indicator light will begin to Allow the engine to warm up before for a few seconds after the flash slowly and the engine idle placing the engine under heavy load engine starts. If the light and will increase to 1,200 r/min. driving. While the engine is warming buzzer remain on, do not drive up under light load, the following the vehicle until the cause has Canceling High Idle Mode checks should be made: been found and corrected. Any of the following actions will 1. Observe the red engine oil 5. Look at the brake system cancel high idle mode. pressure warning light. The warning light. It should be out . The cruise control main switch is light should go out when the when the parking brake is set to OFF. engine is running. If it stays on, released and the engine is . The brake pedal is pressed. shut the engine off and find the running. If it stays on, it could cause. mean that the brake fluid level . The parking brake is released. is low. Check the brake fluid 2. Look at the engine coolant reservoir. This condition must . The selector lever is moved from temperature gauge. If the be corrected before moving the P (Park) or N (Neutral) position. gauge reaches the H (HOT) vehicle. . The accelerator pedal is area, stop the engine and find pressed, accelerating the engine the cause of the overheating. beyond the engine speed 3. Check that the battery warning threshold. light has gone out. The light should go off and stay off at normal idle speeds. If the light Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

176 Driving and Operating engine operating temperature Keep Flammable Material Away { Warning causes several conditions that are from the Vehicle harmful to engine operation and life. To reduce the chance of personal The exhaust pipe is extremely hot injury and/or vehicle damage due Incomplete combustion of fuel in an immediately after vehicle operation. to engine overheating, never engine that is not fully warmed-up Before parking, make sure the area leave the engine idling without an causes crankcase dilution and is free of flammable material (for alert driver present. If the engine forms lacquer and gummy deposits example, grass, waste paper, oil or should overheat, as indicated by on valves, pistons, and rings. It also old tires). Take particular care when causes rapid accumulation of parking in a garage. the engine coolant temperature sludge within the engine. gauge, immediate action is Use caution concerning exhaust required to correct the condition. gases while the engine is idling. Be Continued operation of the Parking over Things particularly careful when the power engine, even for a short time, may That Burn take-off (PTO) is operating (if your result in a fire. vehicle is equipped with a PTO) or { Warning the DPF is regenerating while the Do not engage the exhaust brake engine is idling. See Diesel while the engine is idling as this Exhaust parts and gases become Particulate Filter 0 180. may cause engine overheating. very hot when the DPF is being You and others could be seriously regenerated. { Warning injured. Parking over flammable items It is not recommended that this could allow them to touch hot vehicle be parked, idled or Avoid Unnecessary Idling of the exhaust parts under your vehicle Diesel Engine operated over combustible and cause them to ignite. Do not materials such as grass or If the diesel engine idles too long, park over papers, leaves, grass leaves. They could touch the hot the engine coolant temperature will or other things that can burn. You exhaust system and start a fire. fall below the operating range. Low and others could be seriously This is particularly important if the injured. (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 177

Warning (Continued) Warning (Continued) Engine Exhaust Engine Exhaust Emissions exhaust system has not been grass vegetation or stubble Caution (Carbon Monoxide) properly maintained. Combustible high enough to touch, catch materials could catch fire from hot or collect on its hot exhaust exhaust gases, soot, or sparks system. { Warning that could escape through ‐ Parking or idling should be Do not breathe exhaust gas corrosion holes or cracks. You done only in an area where because it contains carbon and others could be seriously there are no combustible monoxide, which by itself has no injured. materials under the vehicle. color or odor. Carbon monoxide is If operating, parking or idling your Failure to follow these a dangerous gas. It can cause instructions could damage vehicle off-road is unavoidable, unconsciousness and can be your vehicle or nearby such as in farming, lumbering, lethal. property. commercial or recreational use: Do not keep the engine running ‐ The driver should be aware for any length of time in a place that combustible materials that is poorly ventilated. It is could catch fire from the particularly dangerous to run the vehicle's hot exhaust engine in a garage or other indoor system. place that could easily fill with ‐ Carry a fire extinguisher exhaust gases because you could with the vehicle at these suffer carbon monoxide times. poisoning. ‐ Avoid driving your vehicle Inspect the exhaust pipe from through or over combustible time to time. If you notice any materials such as leaves, defect (for example, a damaged (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

178 Driving and Operating

Warning (Continued) Warning (Continued) Warning (Continued)

joint, or a hole or crack caused by We recommend that the exhaust for longer periods of time is not corrosion), have checks and system and cab be inspected by recommended. Entry of carbon maintenance performed by the a competent technician: monoxide into the cab is possible nearest dealer. Continuing to use . Each time the vehicle has with a poorly repaired, damaged, the vehicle without having the an oil change. or corroded exhaust system or defect repaired would be cab. Do not run the engine in dangerous because exhaust . Whenever a change is confined areas (such as garages, gases could get into the cab and noticed in the sound of the next to a building or near another cause carbon monoxide exhaust system. stopped vehicles with engine poisoning. . Whenever the exhaust running) any more than needed to system, underbody or cab is If at any time you think exhaust move the vehicle. damaged or becomes fumes are entering the cab, have corroded. When the vehicle has to be the cause determined and stopped in an unconfined area corrected as soon as possible. To allow proper operation of your with the engine running for any If you must drive under these vehicle's ventilation system, keep more than a few minutes, take the conditions, drive only with all the air inlet grille clear of snow, following steps: windows fully open. Prevent leaves or other obstructions at all times. Do not park with the . Adjust the heating or cooling carbon monoxide from entering system to force outside air engine running or idle this vehicle the cab. The best way is to keep into the cab. the engine exhaust system, cab for more than 10 minutes with the and cab ventilation system ventilation system control switch . With temperature and outlet properly maintained. in the OFF position. Even with the selector knob in any ventilation system on, running the position: (Continued) engine while parked or stopped (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 179 Running the Vehicle Avoid Unnecessary Idling of the Warning (Continued) While Parked Diesel Engine . Set the air selector lever to If the engine idles too long, the the fresh air position. Caution engine coolant temperature will fall below the operating range. Low . Set the fan speed control To reduce the chance of personal engine operating temperature knob to the maximum speed causes several conditions that are position. injury and/or vehicle damage due to engine overheating, never harmful to engine operation and life. Keep the exhaust tailpipe Incomplete combustion of fuel in an . leave the engine idling without an area clear of snow and engine that is not fully warmed-up alert driver present. If the engine other material to help causes crankcase dilution and reduce the buildup of should overheat, as indicated by forms lacquer and gummy deposits exhaust gases under the the engine coolant temperature on valves, pistons, and rings. It also vehicle. gauge, immediate action is causes rapid accumulation of required to correct the condition. sludge within the engine. This is particularly important when Continued operation of the parked in blizzard conditions. You engine, even for a short time, may and others could be seriously result in a fire. Do not engage the injured. exhaust brake while the engine is idling as this may cause engine See Climate Control Systems 0 131 overheating. and Maintenance Schedule 0 327. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

180 Driving and Operating Diesel Particulate This is to prevent the DPF from { Warning being damaged. When operating Filter PTO during parking, check to Exhaust parts and gases become ensure that the regeneration Diesel Particulate Filter (DPF) very hot when the DPF is being required warning light or selectable The DPF purifies diesel exhaust regenerated. (switch) regeneration required gases of particulate matter (PM). PM Parking over flammable items warning light (amber/red) on the DIC is filtered from the exhaust gas and could allow them to touch hot is not on. collected in the DPF. When PM is exhaust parts under your vehicle Engine oil that supports DPF (low collected to the predetermined level and cause them to ignite. Do not ash oil) is recommended. Use of low by the engine control module, the park over papers, leaves, grass ash oil extends the maintenance DPF automatically burns the PM in or other things that can burn. You interval of the DPF filter. a process called regeneration. and others could be seriously Do not modify the DPF or exhaust Regeneration may not be completed injured. pipe. Changing the alignment, under certain driving conditions. length or diameter of the exhaust If this occurs, the Driver Information pipe would adversely affect the Center (DIC) will provide prompts to This content is to restore the function of the DPF and it is not a exhaust system's exhaust emission properly complete DPF reduction function. If any regeneration. malfunction. However, the check engine malfunction indicator light modification is necessary to install a The following sections will provide and reduced engine power indicator component to the rear of the details on DPF regeneration. Follow light may come on and the power vehicle, consult your dealer. the steps carefully to keep the DPF output may be limited if driving or Although the DPF filter automatically in good working order. See Driver power take-off (PTO) operation is 0 undergoes regeneration (burning of Information Center (DIC) 82, continued for a long time with the the accumulated PM) when a Recommended Fluids and regeneration required warning light certain amount of PM has Lubricants 0 349, and Engine Oil or selectable (switch) regeneration 0 accumulated, driving conditions can 245. required warning light (amber/ prevent completion of regeneration. red) on. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 181 The selectable (switch) regeneration Automatic regeneration is performed exhaust brake or exhaust throttle is required warning light (amber) will under normal driving conditions activated or deactivated. The turn on when regeneration cannot (DPF soot accumulation status level sounds do not indicate a fault. be completed automatically. Perform 5, and in rare cases, may be White smoke could be emitted Running or Switch regeneration in performed at continuously briefly from the exhaust pipe in the accordance with the proper low-speeds for long hours, except following situations, but it is not procedure. This is to restore DPF PM level 5); however, the indicating a fault. function and is normal. regeneration required warning light (amber) may be displayed in the ‐ Combustion of PM during DPF The exhaust pipe mixes air with the regeneration. exhaust gas to lower its temperature DIC under the following driving before it leaves the exhaust pipe. conditions: ‐ During DPF regeneration of a ‐ When only low-speed driving at/ new vehicle which has been The frequency of regeneration driven a certain distance. The increases especially under the under vehicle speed of 15 km/h (9 MPH) is performed. vehicle may not emit white following environments: smoke during its initial operation When frequent engine start and ‐ Midwinter. ‐ when new. stop are performed. ‐ Continuous low-speed driving for ‐ Long continuous idling. ‐ When the engine stops every long hours (The frequency of The exhaust brake may regeneration increases time before the engine is warmed up. automatically be activated in order particularly with special to prevent emission of white smoke equipment vehicles such as ‐ When continuous idling (over if the engine idles continuously over sweeper vehicles which mainly 1 hour) is frequently performed. an extended period of time. travel at low speed. The If the vehicle is stationary with the frequency of regeneration is White smoke may be produced engine idling during DPF during switch regeneration; do not higher as compared to delivery regeneration, the exhaust brake or vehicles which mainly travel at perform switch regeneration in any exhaust throttle operates. Operating poorly ventilated indoor place. standard high speed). sounds will be heard when the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

182 Driving and Operating White smoke may be produced DPF Regeneration Status The DPF will regenerate itself as during DPF regeneration when a part of normal operation. new vehicle has been driven a The engine control module (ECM) certain distance, but this is not a controls this function based on malfunction. The vehicle may not several factors including hours of emit white smoke immediately after operation and mileage. When purchase. automatic regeneration starts, the DPF PM Accumulation Level regeneration in progress indicator This amber display indicates the light (amber) is displayed on DPF is regenerating. During DPF the DIC. regeneration, the DIC can display During regeneration the engine idle the status of PM reduction in amber. speed will increase and the exhaust The highest accumulation level bar brake may activate when the vehicle will be flashing as indication of the is idling while stopped or parked. regeneration process. Regeneration is normally completed This green display only indicates As PM levels decrease in the DPF in about 20 minutes. See Driver 0 DPF soot accumulation status. The during the regeneration process, the Information Center (DIC) 82. DIC can display the PM DIC will decrease the number of accumulation level in green. The L bars from H to L. See Driver { Warning indicates Low accumulation of PM Information Center (DIC) 0 82. To prevent fire, ensure that there and the H indicates High Automatic Regeneration of DPF accumulation of PM in the DPF. is no combustible material near the muffler, the DPF or the As PM accumulation increases exhaust pipe. Also, be careful not inside the DPF, the DIC will display to burn yourself on the hot additional bars increasing from L to H to show the approximate level of exhaust gas. You and others PM accumulation. See Driver could be seriously injured. Information Center (DIC) 0 82. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 183 The DPF performs regeneration DPF Switch The DPF switch is used to burn PM automatically when a certain (regenerate the filter). You can quantity of PM accumulates in the initiate regeneration when the filter. regeneration required warning light Depending upon running conditions, or selectable (switch) regeneration however, the regeneration may required warning light turns on with sometimes not be completed. In this short repeated beeps. case, the regeneration required Continuing driving without warning light (amber) will come on, performing the regeneration will so promptly operate the emergency cause the check engine malfunction regeneration according to the indicator light and reduced engine Emergency Regeneration power indicator light to come on. Procedure. This operation recovers The DPF then must be repaired at the function of the DPF. It does not the nearest dealer. mean that a breakdown has occurred. Emergency Regeneration Procedure The engine speed may increase If the regeneration required warning and the exhaust brake may activate light (amber) or selectable (switch) while the vehicle is stopped with the regeneration required warning light engine idling. When this occurs, the (amber) turns on the DIC, the DPF DPF is automatically regenerated. could not satisfactorily complete This does not indicate a failure. automatic regeneration and driver The system generates a sound action is required. If the during the automatic regeneration regeneration required warning light and its cancellation. This does not (Not selectable (switch) indicate a failure. regeneration warning light) is turned on, you can choose from Running Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

184 Driving and Operating regeneration or Switch regeneration or selectable (switch) regeneration 2. Increase the vehicle speed in order to complete the DPF required warning light is displayed above 48 km/h (30 MPH) and regeneration. on the DIC. keep a constant speed. If the selectable (switch) Continuing to drive without 3. When vehicle speed, engine regeneration required warning light performing DPF regeneration will coolant temperature and other turns on, you have to perform cause the check engine malfunction factors are met the engine Switch regeneration in order to indicator light and reduced engine control module (ECM) will complete the DPF regeneration. power indicator light to come on, an begin DPF regeneration and If you continue driving too long with engine power reduction, and may the regeneration in progress the regeneration required warning cause damage to the DPF filter. See indicator light (amber) will light (amber) or selectable (switch) Driver Information Center (DIC) appear on the DIC. 0 regeneration required warning light 82. 4. Continue driving until the (amber) displayed on the DIC Running Regeneration Procedure regeneration in progress without performing one of the indicator light (amber) goes off. possible regenerations, the Use this option for completing DPF When this indicator light goes message will change to red regeneration, if driving conditions off the DPF regeneration is Regeneration Required warning and traffic allow you to maintain a complete. light or selectable (switch) relatively constant speed above regeneration required warning light. 48 km/h (30 MPH) for about See Driver Information Center (DIC) 0 82. The red regeneration required 20 minutes. warning light or selectable (switch) Follow the steps below to use While the vehicle is at a stop with regeneration required warning light Running regeneration: engine idling, the engine speed increases. indicates the DPF filter is nearly full 1. Determine if road and traffic of PM, a condition which may be conditions allow for relatively damaging to the filter. constant speeds above DPF regeneration should be 48 km/h (30 MPH). completed immediately if the red regeneration required warning light Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 185 Switch Regeneration Procedure 5. The regeneration required Warning (Continued) warning light (amber or red) or selectable (switch) exhaust pipe. Remember that the regeneration required warning temperature of exhaust gases is light (amber or red) on the DIC high enough to burn you. You and will turn off and the others could be seriously injured. regeneration in progress indicator light will appear. Select Switch regeneration 6. Do not leave the vehicle during procedure if the Running the regeneration. Regeneration regeneration procedure is not normally completes in about possible, or if the selectable (switch) 20 minutes. regeneration required warning light (amber or red) is displayed on 7. When the regeneration in the DIC. progress indicator light (amber) goes out, regeneration is 1. Stop the vehicle at a safe place completed. Normal driving is free of flammable material such then possible. as dead grass, leaves or waste paper. If the Switch regeneration is interrupted, a selectable (switch) 2. Move the selector lever into the regeneration required warning light P position and firmly engage (amber) will appear on the DIC. You the parking brake. must complete the DPF { Warning 3. Let the engine idle. Be sure the regeneration by performing the accelerator pedal is not Switch regeneration once again as To prevent a fire, make sure that soon as possible. there is no flammable material pressed and the PTO switch (if equipped) is OFF. near the muffler, DPF and If you continue driving too long with the selectable (switch) regeneration (Continued) 4. Press and release the DPF switch. required warning light (amber) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

186 Driving and Operating displayed on the DIC, the message Once the Switch regeneration is During regeneration, white smoke will change to red. The selectable started, it cannot be switched to the may be temporarily produced from (switch) regeneration required Running regeneration if interrupted. the exhaust pipe. This results from warning light (red) indicates the When the Switch regeneration is combustion of PM, it does not DPF filter is nearly full of PM, a selected, end regeneration in a indicate a failure. condition which may be damaging single operation if possible. Switch regeneration will complete to the filter. During the regeneration, the engine earlier immediately after driving than DPF regeneration should be speed may vary, causing the when the engine is cold. completed immediately if the exhaust brake valve to be The engine coolant temperature selectable (switch) regeneration deactivated. However, while the may rise during switch regeneration. required warning light (red) is regeneration in progress indicator displayed on the DIC. light (amber) appears, regeneration Interruption of Switch Continued driving without is still taking place, so continue to Regeneration performing DPF regeneration will perform regeneration until the If you must interrupt regeneration for cause the check engine malfunction message goes off. an unavoidable reason, press the DPF switch again. indicator light and reduced engine The time needed to complete power indicator light to come on, an regeneration differs depending on The regeneration in progress engine power reduction, and may the outside temperature. indicator light (amber) changes to cause damage to the DPF filter. See The exhaust brake or exhaust the selectable (switch) regeneration Driver Information Center (DIC) required warning light (amber). 0 82. throttle is activated during DPF regeneration. The exhaust brake or Then, you can drive the vehicle. When operating the PTO for a long exhaust throttle starting to operate If you interrupt regeneration, you need to perform regeneration again. time if your vehicle is so equipped, or being disengaged will produce a make sure that the regeneration sound, but this does not indicate a Perform switch regeneration required warning light or selectable failure. beginning with Step 1 as soon as (switch) regeneration required possible. warning light (amber) is not turning on. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 187 Switch regeneration will be Selectable regeneration may only 1. Stop the vehicle at a safe place interrupted in the following be performed when no other DPF free of flammable material such circumstances: message is present on the DIC. Be as dead grass, leaves or waste . Accelerator pedal is pressed. sure to follow any DPF messages paper. present on the DIC to properly . Gear-in. 2. Move the selector lever into the complete a DPF regeneration. P position and firmly engage . Vehicle speed is above It is recommended to use the the parking brake. 0 km/h (0 MPH). procedure during breaks in PTO . Engine speed increases. operation (if equipped) and other low speed applications. Operation noise caused by interruption is louder when pressing the accelerator pedal than other { Warning operations. This is not a failure. Do not leave the vehicle during Selectable Regeneration the regeneration. Procedure Make sure that there are no Your vehicle is equipped with flammables near the muffler, DPF Selectable Regeneration. This and exhaust pipe which may procedure is designed for vehicles result in a fire. that do not normally operate in conditions that make automatic Remember that the temperature regeneration possible. This function of exhaust gases is high enough allows the driver to check the status to burn you. You and others could of the PM level and, when available, be seriously injured. perform Switch regeneration at a convenient time for the driver. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

188 Driving and Operating operating temperature. Regeneration may take longer if the engine is cold. 9. When the regeneration in progress indicator light goes out, the Selectable regeneration is complete. If the Selectable regeneration is interrupted, a selectable (switch) regeneration required warning light (amber) will appear on the DIC. You must complete the DPF regeneration by performing the 3. Run the engine at idle. Be sure DPF filter is OK and DPF Switch regeneration as soon as the accelerator pedal is not regeneration is not needed at possible when Selectable pressed and the PTO switch (if this time. regeneration is interrupted. equipped) is OFF. 6. Press and release the DPF If you continue driving too long with 4. Press and hold the DPF switch switch to begin regeneration. the selectable (switch) regeneration until the amber checking PM 7. The selectable (switch) required warning light (amber) Level indicator light appears on regeneration required warning displayed on the DIC, the warning the DIC. light (amber) will change to light will change to red. The 5. If Selectable regeneration is regeneration in progress selectable (switch) regeneration available, the selectable indicator light. required warning light (red) indicates the DPF filter is nearly full of PM, a (switch) regeneration required 8. Do not leave the vehicle during condition which may be damaging warning light (amber) will the regeneration. Regeneration appear on the DIC. If this normally completes in about to the filter. DPF regeneration indicator light does not appear 20 minutes, if the engine is at should be completed immediately if on the DIC, the PM level in the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 189 the selectable (switch) regeneration The engine coolant temperature Diesel Exhaust Fluid required warning light (red) is may rise during regeneration. displayed on the DIC. Diesel exhaust fluid (DEF) is used DPF Regeneration during exclusively for the selective catalytic Continued driving without Prolonged Idling reduction (SCR) system. Be sure to performing DPF regeneration will DPF regeneration may be initiated use only API certified DEF. When cause the check engine malfunction automatically during prolonged the SCR system detects DEF level indicator light and reduced engine idling. If regeneration is initiated, the is nearly empty or incorrect fluids power indicator light to come on, an regeneration in progress indicator (such as water or low concentrated engine power reduction, and may light (amber) comes on but this is DEF.) are added, the SCR system cause damage to the DPF filter. See normal and does not indicate a will turn on warning and indicator Vehicle Messages 0 86. failure. lights and reduce engine power in The time needed to complete progressive stages to encourage If driving is started or the PTO is regeneration differs depending on you to have the condition corrected. connected during DPF regeneration the outside temperature. Continuing to drive for too long after by prolonged idling, the selectable these lights come on will eventually The exhaust brake is activated (switch) regeneration required result in a severe vehicle speed during DPF regeneration. The warning light (amber) comes on and limitation. See Vehicle Messages exhaust brake starting to operate or regeneration is suspended. Perform 0 86 being disengaged will produce a Switch regeneration procedure in sound, but this does not indicate a order to complete the DPF The DEF freezes below −11 °C failure. regeneration. (12 °F). The SCR system is equipped with a heating function During regeneration, white smoke Prolonged idling may require more which utilizes the engine coolant, so may be temporarily produced from frequent DPF regeneration. the exhaust pipe. This results from the engine can be started even See Driver Information Center (DIC) combustion of PM, it does not when DEF is frozen. 0 82. indicate a failure. Regeneration is finished earlier immediately after driving than when the engine is cold. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

190 Driving and Operating Handling of DEF Adding DEF Before Driving the Warning (Continued) Use only API certified DEF (or ISO: Vehicle AUS 32). DEF is a colorless, Although it is rare, a person with Add DEF regularly to maintain an transparent solution. It may smell sensitive skin may suffer from adequate supply. If the DEF level depending on the conditions, but irritation. If you come into contact becomes too low the DEF low level this is not abnormal. with DEF, flush the affected area warning system may activate. The DEF is available from your local with water and/or soap. If irritation vehicle speed will be severely authorized dealer. In addition, the or redness develops or persists, limited when the DEF tank is empty. U.S. Department of Energy has seek medical attention. Be sure to obey the following created an on-line DEF locator that instructions when refilling the If it is accidentally swallowed, can be accessed at http:// vehicle: www.afdc.energy.gov/afdc/locator/ drink 1-2 glasses of water or milk and seek immediate medical . Stop the engine before def/. The American Petroleum adding DEF. Institute (API) also maintains a list attention. of API-certified distributors of DEF If it does come into contact with . When filling, place the nozzle on its web page at http:// an eye, immediately rinse it off deeply into the DEF tank. If you www.apidef.org/searchresults.asp. with a large amount of water for try to fill more DEF by pulling out the nozzle from the DEF tank, at least 15 minutes, and then DEF may spill out. { Warning seek medical attention. . Obey all cautions posted in filling Though DEF should be harmless You and others could be seriously stations. for physical contact, in the rare injured. . When DEF is spilled, wash it case in which it induces make away with water and wipe the 0 sure to take following actions: See Winter Driving 151, and area clean. In the event that DEF does come Recommended Fluids and Lubricants 0 349. . Add API certified DEF only (or into contact with your skin, wash ISO: AUS 32). Do not fill the it off with water and/or soap. DEF tank with any substance (Continued) other than the DEF. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 191 . Any substance other than the . After stopping the engine, a flow 2. Wipe off dust or dirt from DEF may cause a breakdown to sound may be heard from the around the filler port of the the SCR system. DEF tank or DEF supply pump. DEF tank. . Use the DEF handling This sound occurs as the DEF in 3. Turn and remove the filler cap. equipment made of correct the piping is returning to the tank, and does not indicate an 4. Refill the tank up to the F materials (Polyethylene or position in the level gauge on Stainless-steel). abnormality. 0 the front face of the tank. The . Avoid contamination from using See Winter Driving 151. DEF may overflow from the dirty funnel for filling. Adding DEF filler port if it is added in excess . If a fluid other than the specified of the F position. DEF is mistakenly added, 5. Tighten the cap after refilling is incorrect fluid may cause a completed. failure. Have it inspected and 6. Wipe off DEF that is spilled at serviced at a dealer immediately. refilling. . Ammonia odor may be generated when the DEF is { Warning exposed to high temperature. . Do not add DEF above the F On occasion, you may notice an position on the level gauge. DEF odor when the DEF tank is may leak from the breather hose opened. Do not sniff the filler while driving. Also, the sensor port, etc. may be broken when DEF 1. Turn the engine control switch When refilling the DEF tank: freezes. to the ACC or LOCK position Failure to follow the above . Do not put your feet on or stand and make sure to stop the instructions could result in a fire on the DEF tank. The tank, pipe engine. or a breakdown of the selective or sensors may be damaged. catalytic reduction (SCR) system. (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

192 Driving and Operating When DEF dries it will leave a DEF is added. Take the following Warning (Continued) crystalline residue, this condition is actions to avoid this condition in normal. Wash with water or wipe cold weather: Do not dilute DEF with water. away the residue to prevent it from 1. Refill the DEF as soon as Do not add substances such as entering the DEF tank. possible after parking the gasoline or diesel fuel to the DEF Adding DEF in Cold Weather vehicle. tank. You and others could be seriously injured. DEF freezes at low temperature but 2. Turn the engine control switch the engine coolant circulates to to the ON position from the thaw the DEF tank and to prevent LOCK position. DEF from freezing. Vehicle can be 3. Wait for the warning buzzers Caution driven normally when DEF is frozen. and warning lights to turn off. When opening the DEF tank cap, If the refill diesel exhaust fluid (DEF) 4. If the buzzer does not stop, warning light is on and the be careful not to let dirt or other return the engine control switch remaining DEF in the DEF tank is foreign matter enter inside the back to the LOCK position and frozen, the warning lights, indicator DEF tank. Intrusion of foreign add more DEF, and then start lights and restriction will not be over from step (2) above. matter can cause a clogging of canceled until the DEF thaws even the filter or affect the quality of if the DEF tank is refilled. 5. Turn the engine control switch DEF, which may result in a SCR to the LOCK position. system failure. It is not recommended parking the vehicle for long periods with the refill The DEF freezes at approximately If DEF is spilled on the body or diesel exhaust fluid (DEF) warning −11 °C (12 °F). frame, it may cause generation of light on in cold weather. The DEF In cold weather, when the vehicle is rust, so wipe it off and then rinse gauge will not register correctly left without performing these actions it away with water. should the DEF freeze in this and the DEF tank freezes, the low condition causing the DEF low level DEF level warnings and indicators warning system not to reset when may not turn off when DEF is added until after the tank defrosts. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 193 Make sure to stop the engine before To store or carry DEF, use the adding the DEF. See Warning { Warning original container in which the DEF Buzzers 0 91. was kept at the time of purchase. Do not warm up the DEF tank Also, if other containers are used, When DEF Freezes using a burner, heater, etc. You prepare a clean container for Engine coolant circulates through and others could be seriously exclusive use, which can be a the DEF tank to thaw it when frozen injured. polyethylene resin tank (PE) or and prevent it from freezing while stainless steel container, and do not the engine is running. The vehicle DEF Storage introduce foreign matter such as can be driven normally when DEF is water or contamination. frozen in the DEF tank. Seal the container and store it in an indoor place with good ventilation DEF Disposal If the Refill DEF warning light is on avoiding direct sunlight. and the remaining DEF in the DEF Do not dispose of DEF and the tank is frozen, the vehicle low level When storing DEF, the shelf life empty container into lakes, marine warning system cannot be reset by varies depending on the room areas, rivers, etc. DEF must be adding DEF. The DEF gauge will not temperature of the storage place. disposed of in a method conforming register correctly should the For details, please contact the to the regulatory requirements in remaining DEF freeze at this level. distributor of the DEF. your state. Move the vehicle to a location to For storage of DEF, seal the allow the DEF to thaw. Once the container to prevent the moisture DEF is thawed the DEF gauge from evaporating. should read correctly allowing the Even when DEF has been frozen, low level warning system to reset. its quality is maintained when it is To avoid this condition follow the thawed. It can be used as it is. instructions for Adding DEF in Cold Weather. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

194 Driving and Operating Selective Catalytic Reduction Continuing to drive for too long after Do not relocate or modify the (SCR) System these lights come on will result in exhaust pipe, muffler, DPF, SCR, The Selective Catalytic Reduction additional warnings, more engine or DEF tank, which may affect the (SCR) system reduces nitrogen power reduction and will eventually exhaust gas cleaning performance. oxide (NOx) emissions emitted from result in a severe vehicle speed If any relocation or modification is a diesel engine. The SCR system limitation. See “Diesel Exhaust necessary, consult your dealer. reduces NOx by adding (injecting) Fluid (DEF) Low Level Warning” and The SCR system continues to Diesel Exhaust Fluid (DEF) into the “Incorrect Diesel Exhaust Fluid operate for approximately 3 minutes exhaust system and inducing a (DEF)/SCR System Malfunction after the engine control switch is reaction converting NOx into water Warnings” later in this section. turned to the "LOCK" position. It is vapor and nitrogen. normal to hear a buzzing type noise { Warning The SCR system consists of the from the DEF supply pump (mounted on the left side frame rail DEF tank, DEF Control Unit, DEF Do not touch the water that Supply Pump and Injector, and the behind the cab) during the comes out from the muffler. The shutdown process. SCR Catalyst. It is important to keep water is mildly acidified due to the a good supply of DEF in the DEF action of oxidation catalyst inside If it is necessary to disconnect the tank at all times. Monitor the DEF the muffler. In the event that the batteries for any reason, be sure to gauge to be sure the DEF tank level wait at least 3 minutes after turning fluid does come into contact with does not become too low. the engine control switch to the your skin, completely wash it off "LOCK" position. This will allow the If the DEF level becomes too low or with water. You and others could incorrect fluid is added to the DEF SCR system to properly complete be seriously injured. its shutdown processes. See Winter tank, the warning buzzer will sound, 0 warning and indicator lights will Driving 151. come on and engine power will be reduced. If you see these warning and indicator lights, add DEF as soon as possible or have your vehicle serviced as soon as possible. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 195 Diesel Exhaust Fluid (DEF) Low These warning and indicator lights Level Warning will go out automatically and engine Diesel Exhaust Fluid (DEF) is a power will be restored to normal required fluid for the operation of after the SCR system detects that your diesel engine just as diesel fuel the DEF tank is refilled with DEF. is required. To avoid running out of DEF your vehicle will turn on warning and indicator lights and reduce engine power in progressive stages to encourage adding DEF. The following is a summary of the diesel exhaust fluid (DEF) low level warning lights, indicator lights and engine power reductions. Continuing to drive for too long after these lights come on will eventually result in a severe vehicle speed limitation. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

196 Driving and Operating DEF Tank Level is Low/Empty Stage Stage 1 Stage 2 Stage 3 Stage 4

DIC main display

DEF gauge (DIC sub display 2)

Solid (amber) Blinking (amber) Solid (red) Solid (red) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 197 DEF Tank Level is Low/Empty (cont'd) Stage Stage 1 Stage 2 Stage 3 Stage 4

Indicator light(s) Solid Slow blinking Fast blinking Fast blinking

Warning buzzer 1 short beep 3 short beeps *3 3 quick beeps *4 Continuous beeping Vehicle speed is Vehicle speed is Vehicle speed is Vehicle speed is Restrictions limited to limited to limited to limited to 89 km/h (55 MPH) 56 km/h (35 MPH) 56 km/h (35 MPH) 8 km/h (5 MPH) Refill DEF as soon Refill DEF tank Refill DEF tank Refill DEF tank Required action as possible *1 immediately *1 immediately *1 immediately *1 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

198 Driving and Operating DEF Tank Level is Low/Empty (cont'd) Stage Stage 1 Stage 2 Stage 3 Stage 4

CAUTION

This message indicates incorrect DEF or an SCR system malfunction. Immediately contact your dealer to have your vehicle serviced *2

Remarks: DEF tank low stages are as follows: begin blinking. Again, engine power will be reduced so the vehicle speed *1 – See Diesel Exhaust Stage 1 : When the remaining level Fluid (DEF). of DEF becomes excessively low will not exceed 56 km/h (35 MPH). the DEF gauge will change color Stage 3 : If driving is continued until *2 – See Incorrect Diesel Exhaust Fluid (DEF) /SCR System from green to amber. In addition, the DEF tank is empty, the DEF Malfunction Warnings. warning and indicator lights will gauge will change color from amber come on as shown in the table and to red and the warning and indicator *3 – The warning buzzer continues engine power will be reduced so the lights will begin to blink faster. to sound every 5 minutes. vehicle speed will not exceed Engine power will still be reduced so *4 – The warning buzzer continues 89 km/h (55 MPH). the vehicle speed will not exceed to sound every 5 minutes and when Stage 2 : If driving is continued 56 km/h (35 MPH). The vehicle driving 8 km (5 miles) or more, the without adding DEF (approximately speed will be limited to buzzer changes its sound to 320 km (200 miles)) the DEF gauge, 8 km/h (5 MPH) either when the continuous beeping. warning and indicator lights will vehicle is stopped after driving Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 199 further on (approximately long after these lights come on may 8 km (5 miles)) or when the engine eventually result in a severe vehicle is restarted. speed limitation. Stage 4 : The DEF gauge is red, The following is a summary of the the indicator light is blinking and the warning lights, indicator lights and buzzer is beeping continuously restrictions. When these warning indicates the vehicle speed is and indicator lights come on the limited to 8 km/h (5 MPH). See DIC, promptly have the vehicle Driver Information Center (DIC) inspected and serviced at a dealer. 0 82. In the case of SCR system Incorrect Diesel Exhaust Fluid malfunction (Type B), have the (DEF)/SCR System Malfunction vehicle inspected and serviced at a Warnings dealer. The SCR system continuously monitors emissions reduction performance and SCR system malfunction (Type A or Type B). When a malfunction or incorrect fluid (such as water or low concentrated DEF, etc.) is detected, the SCR system will turn on warning and indicator lights to encourage you to have the condition corrected. In the case of incorrect fluid or if an SCR system malfunction (Type A) is detected, continuing to drive for too Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

200 Driving and Operating Incorrect DEF/SCR System Malfunction (Type A) Warnings Stage Stage 1 Stage 2 Stage 3 Stage 4

DIC main display

DEF gauge (DIC sub Various Various Various Various display 2)

Indicator light(s) Slow blinking Fast blinking Fast blinking Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 201 Incorrect DEF/SCR System Malfunction (Type A) Warnings (cont'd) Stage Stage 1 Stage 2 Stage 3 Stage 4

Indicator light(s) or or or or

Warning buzzer 1 short beep 3 short beeps *1 3 quick beeps *2 Continuous beeping Vehicle speed: Vehicle speed: Vehicle speed: Vehicle speed: Restriction 89 km/h (55 MPH) 56 km/h (35 MPH) 56 km/h (35 MPH) 8 km/h (5 MPH)

Remarks: *2 – The warning buzzer continues When the exhaust system warning to sound every 5 minutes and when light comes on DIC, promptly have *1 – The warning buzzer continues to sound every 5 minutes. driving 8 km (5 miles) or more, the the vehicle inspected and serviced buzzer changes its sound to at a dealer. continuous beeping. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

202 Driving and Operating Stage 1 : When incorrect DEF or an Stage 4 : DEF indicator light is SCR system malfunction (Type A) is blinking quickly, the other warning detected, the warning and indicator lights are on and the buzzer is lights will come on as shown in the beeping continuously indicates the table and engine power will be vehicle speed is limited to 8 km/h (5 reduced so the vehicle speed will MPH). See Vehicle Messages 0 86, not exceed 89 km/h (55 MPH). Malfunction Indicator Lamp (Check 0 Stage 2 : If driving is continued for Engine Light) 73, Diesel Exhaust Fluid (DEF) Warning Light 0 80, and another approximately 0 160 km (100 miles), the warning and Reduced Engine Power Light 81. indicator lights will begin blinking. Again, engine power will be reduced so the vehicle speed will not exceed 56 km/h (35 MPH). Stage 3 : If driving is continued for approximately 105 more km (65 miles), the warning and indicator lights will begin to blink faster. Engine power will still be reduced so the vehicle speed will not exceed 56 km/h (35 MPH). The vehicle speed will be limited to 8 km/h (5 MPH) either when the vehicle is stopped after driving further on (approximately 8 km (5 miles)) or when the engine is restarted. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 203 SCR System Malfunction (Type B) Warning Stage Stage 1 Trigger SCR system malfunction detected

DIC main display

DEF gauge (DIC sub Various display 2) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

204 Driving and Operating SCR System Malfunction (Type B) Warning (cont'd) Stage Stage 1

or

Indicator light(s)

Warning buzzer 1 short beep Restriction – Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 205 When the exhaust system warning 4. If the buzzer does not stop, Automatic light comes on, promptly have the return the engine control switch vehicle inspected and serviced at a back to the LOCK position and Transmission dealer. add more DEF, and then start On an automatic transmission over from step 2 above. When a malfunction is detected in vehicle, the driver does not use a the SCR system, the warning and 5. Restart the engine. clutch pedal when pulling away, the indicator lights shown in the It may take a while until the warning changing gears, or stopping. Only table come on. See Vehicle the selector lever, accelerator pedal, 0 lights and indicators turn off and the Messages 86, Malfunction buzzer stops after turning the and brake pedal are used. Indicator Lamp (Check Engine engine control switch to the ON Practice learning the characteristics Light) 0 73, and Diesel Exhaust position. of the automatic transmission Fluid (DEF) Warning Light 0 80. It is desirable to fill up the tank with vehicle and how to correctly operate When the Diesel Exhaust Fluid DEF to avoid DEF remaining level it. When the vehicle is stationary, (DEF) Tank is Empty warning indication from reappearing. remember to keep the brake pedal firmly pressed, and if necessary, If the DEF tank is empty and When the outside temperature is move the selector lever in the P or warning and indicator lights are on, low, refer to Adding DEF in Cold N position and apply the parking you must follow below procedure to Weather. See Driver Information brake. cancel the vehicle restriction: Center (DIC) 0 82, Brake System Creep : With the engine running 1. Turn the engine control switch Warning Light (Parking Brake Light) and a gear position other than P or to the LOCK or ACC position, 0 74, Warning Buzzers 0 91, and N selected with the selector lever, and add DEF. Winter Driving 0 151. power reaches the wheels even 2. After adding DEF, turn the when the accelerator pedal is not engine control switch to ON pressed, causing the vehicle to tend position. to move. 3. Wait until buzzer stops, warnings and indicators are turned off. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

206 Driving and Operating Furthermore, the higher the engine . While the air conditioner is speed, the stronger the creep and Caution (Continued) running. the greater the vehicle's tendency . During the diesel particulate filter to move. Failure to observe this precaution can lead to faulty operation of the (DPF) regeneration. Starting electrical system. How to Use the Automatic Start the engine in either the P or Transmission the N position. The engine should not start in any other selector Caution { Warning position. If it does, something is wrong. Have your truck checked by Never move the selector into the Before starting the engine, move your dealer as soon as possible. P position when the vehicle is in the selector lever into P or N (P is Always apply either the foot brake motion. This will damage the preferred), make sure the shift or the parking brake before shifting automatic transmission. indicator indicates P or N, pull up into any driving position. This will the parking brake lever and firmly prevent creeping. press the brake pedal. Firmly press the brake pedal to The engine should be running at prevent the vehicle from moving When moving the selector lever to idle when shifting from P or N to one even if it is stopped on a level road, any position other than P, be sure of the driving positions. See and move the selector lever into P to press the brake pedal. Selector Lever 0 214. and firmly apply the parking brake Never leave the driver's seat with as needed. the selector lever placed in D, 2, Caution The engine speed rises and 1 or R. The vehicle may start creeping will be stronger than usual Do not apply water from a moving. When leaving the driver's during the conditions noted below. seat, be sure to move the selector high-pressure washer nozzle Keep the brake pedal firmly directly to the electric connectors. lever into P and securely set the pressed: parking brake. (Continued) . Immediately after engine (Continued) start up. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 207 Practice operating the selector lever Even if you plan to move only a Warning (Continued) between the N and D without short distance, sit in the correct pressing the push button. driving position and make sure you When you move the selector lever Do not operate the selector lever can firmly press the brake and into D, 2, 1 or R, creep will cause accelerator pedals. the vehicle to move. while pressing the accelerator pedal. Doing so is dangerous When you reverse, you twist to look When pulling away from a because the vehicle would rearward so pedal operation standstill, you must control the suddenly move. becomes difficult. Firmly press the speed using only the accelerator Do not operate the automatic brake pedal. Also, practice returning pedal. Operate the accelerator transmission at or near stall the selector lever immediately to the pedal carefully. condition for more than N position after reversing. When Do not operate the selector lever five seconds. Stall condition is when pulling away, visually check the selector lever position and the shift while pressing the accelerator the transmission is in one of the indicator. pedal. The vehicle may make a driving ranges, the engine is running sudden start, possibly causing an at high speed, but the drive wheels When the vehicle is stopped, do not accident. are unable to move. This condition keep pressing the accelerator pedal might occur if the vehicle is stuck in with the selector lever in a forward You and others could be seriously deep sand or is pushing against a gear or R position while pressing injured. fixed barrier. Operating the the brake pedal. Doing so may transmission at stall condition will cause a breakdown. When pulling away, visually check result in overheating and damage. Sit in the correct driving position, the position of the selector lever. Do not hold your vehicle on an and use your right foot to operate If you always press the push button upgrade with the accelerator pedal. the brake and accelerator pedals. while operating the selector lever, Doing so will result in automatic To avoid accidentally pressing the the lever may occasionally move to transmission overheating and wrong pedal, check the pedal the other gear position against your damage. Use the parking brake or positions and practice putting your intentions. foot brake to hold the vehicle on an foot on the desired pedal. upgrade. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

208 Driving and Operating To start your vehicle: On a steep slope: Normal Driving 1. Firmly press the brake pedal. Make sure that the shift indicator When you move the selector lever After making sure the selector indicates the correct gear (D for from P into D, shifting takes place in lever is placed into P or N, that forward movement, or R for the automatic mode. Check that D is P or N is shown in the shift backward movement), check the displayed in the shift indicator. indicator and that the parking area around the vehicle is clear, If the automatic transmission fluid brake lever is fully pulled up, release the brake pedal with your temperature is too low, the place the engine control switch right foot, and then slowly press the transmission may not initially make into the ON position. accelerator pedal. automatic shift to the 4th, 5th, and 2. Start the engine and move the After you feel the vehicle start 6th gear. This condition is normal selector lever into D for forward moving, gradually release the and will be resolved as the fluid movement, or R for backward parking brake lever and start driving temperature rises. movement while firmly pressing the vehicle. To Accelerate the brake pedal with your When the brake pedal is not right foot. pressed, the shift lock system To accelerate when the accelerator 3. Make sure that the shift operates and the selector lever pedal is pressed further, kickdown indicator indicates the correct cannot be shifted from P to any operates and the speed increases. gear (D for forward movement, other position. The transmission will downshift at or R for backward movement), speeds below 88 km/h (55 MPH), to See Driver Information Center (DIC) provide greater acceleration. release the parking brake, 0 82, Starting and Stopping the release the brake pedal, and Vehicle 0 168, Selector Lever 0 214, Kickdown then gradually press the and Automatic Transmission Shift If you press the accelerator pedal accelerator pedal. The vehicle Lock Control Function Check 0 274. fully while driving, in accordance starts moving as you press the with the current speed the gear accelerator pedal further. automatically shifts down and the engine speed rises, enabling sufficient acceleration. This is called kickdown. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 209 You can easily accelerate to the Driving Uphill or Downhill required speed when overtaking Uphill driving: other vehicles or when joining traffic on a highway. In order to maintain With the selector lever in D, if you speed when driving on an uphill press down on the accelerator road, as you gradually press the pedal, kickdown (change to a low accelerator pedal the engine may speed gear) may operate causing automatically shift down in the engine revolutions to suddenly accordance to the current speed increase (increasing the speed). (shifts to a lower speed gear), Driving for a prolonged duration on increasing the engine speed and an uphill road with the selector lever increasing vehicle speed. in D may cause the automatic transmission fluid to overheat. Drive with the overdrive off switch ON to keep the engine revolutions constant to enable smoother driving with fewer changes in engine revolutions. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

210 Driving and Operating

Driving conditions Selector lever position Select 2 position during low speed operation under 36 km/h (22 MPH). Normal uphill road D (overdrive off switch ON) See Automatic Transmission Fluid Steep uphill, steep slope, mountain Temperature Warning Light 0 78. 2 or 1 road with many sharp curves To Stop Your Vehicle Long uphill road 2 1. To temporarily stop the vehicle, press the brake pedal firmly while the selector lever is in D. Downhill driving: You can increase engine braking by 2. Use the parking brake as Do not overuse the foot brake. This driving with the selector lever in the 2 position. required. Press the brake pedal will cause the brakes to overheat, firmly, and firmly apply the reducing their effectiveness. On To apply a stronger engine brake on parking brake. long downward slopes or sharp sharp downhill sections, shift the downhill sections of road, use the selector lever to the 1 position when If the vehicle is stationary for a engine brake together with the foot required. long time, move the selector lever into the N or P position. brakes to control the speed. 0 See Control of a Vehicle 139. If the selector lever is kept in When the selector lever is in the D D, the temperature of the position, you can drive with the Driving at Low Speeds for Sustained Periods automatic transmission fluid overdrive off switch ON to allow a increases due to heat from the gentle engine brake to be applied. Any low speed applications such as torque converter. sweeper, road marking machinery, Push the overdrive off switch to the To ensure reliable brake application, ON position at speeds below trash collectors, highway striping or moving, etc. require the following be sure to use your right foot to 101 km/h (63 MPH) to increase press the brake pedal. engine braking action when treatment to prevent the automatic traveling downgrade. transmission fluid (ATF) from When leaving the driver's seat, overheating: follow the When Parking Your Select 1 position during low speed Vehicle procedure. operation under 18 km/h (11 MPH). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 211 To Start After Stopping If you cannot move the selector Warning (Continued) To start again after stopping your lever from the P position after vehicle, visually check that the starting the engine, perform the When parking on a slope, move following necessary checks: selector lever is in D, and gradually the selector lever in the P position press the accelerator pedal to and block the wheels with chocks. . Check that you are firmly pull away. You and others could be seriously pressing the brake pedal. When Parking Your Vehicle injured. . Check if the area where your vehicle is parked is not a slope. { Warning 1. Keep pressing the brake pedal . If your vehicle is parked on a firmly with your right foot, then downhill slope, the push Do not leave your vehicle while apply the parking brake. operation of the selector lever the engine is still running. Do not 2. Move the selector lever in the may become heavy to move. In park with the selector lever in a this case, you can operate the P position, check that the shift position other than P or N the indicator is indicating P, and selector lever more smoothly by vehicle may begin moving by slowly ease your right foot off pushing the selector lever itself due to creeping. You may the brake pedal. towards the front of the vehicle accidentally press the accelerator while pushing the button. 3. Stop the engine and remove pedal when getting into the Shift Lock System vehicle causing it to start moving the key. When the selector suddenly. lever is not placed in the P When Starting Your Vehicle position, the shift lock system When parking the vehicle, always operates and the key cannot The selector lever cannot be apply the parking brake and move be removed. operated from the P position to any the selector lever to the P other position without the brake See Starting and Stopping the pedal being pressed. Be sure to position. 0 Vehicle 168, and Parking Brake operate the lever while pressing the (Continued) 0 220. brake pedal. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

212 Driving and Operating When Parking Your Vehicle If you cannot move the selector Releasing the Shift Lock in an The key cannot be removed unless lever from the P position after Emergency the selector lever is securely placed starting the engine, perform the If moving of the selector lever from in the P position (key interlock following checks: P to another position is still not system). Be sure to place the . Check that you are firmly possible even after performing the selector lever in the P position when pressing the brake pedal. When instructions given in the steps parking the vehicle. the brake pedal is not pressed, above, with the brake pedal fully The shift lock system is a system for the shift lock system operates pressed and the vehicle parked on a safety to prevent incorrect operation and the selector lever cannot be flat surface, carry out the procedure of the automatic transmission. Use it shifted from P to any other described under “If You Cannot correctly and drive safely. position. Move the Selector Lever from the P Position . . Check if the area where your ” If You Cannot Move the Selector vehicle is parked is not a slope. Lever from the P Position . If your vehicle is parked on a Caution downside slope, the operation of the selector lever may become When the selector cannot be heavy to move. In this case, you operated from the P position to can operate the selector lever any other position even after more smoothly by moving the performing the operation below selector lever towards the front repeatedly, the shift lock system of the vehicle while pressing the button. may have a failure. Have the vehicle inspected at your dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 213 Actions that Can Lead to a Breakdown with an Automatic Transmission Actions that can lead to a breakdown Breakdown symptoms Stopping the vehicle on an uphill road with the selector lever in a position other than R, N, or P, the accelerator pedal pressed, and the brakes not applied. The transmission fluid overheats. Continuously pressing the accelerator pedal and brake pedal at the same time while the vehicle is in a position other than N or P. Placing the selector lever into any gear with the accelerator pedal pressed The transmission gears are and the engine speed high. overloaded. The parking mechanism will be Placing the selector lever into P before the vehicle has completely stopped. damaged. Turning off the engine control switch while driving. The transmission is not properly Driving with the selector lever in the N position on a long downward slope lubricated. (this is dangerous due to the lack of engine brake). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

214 Driving and Operating Selector Lever N (Neutral) : Can be used when starting the engine, but for safety, { Warning Move the selector lever (2) to make get in the habit of starting the a shift into each gear position. engine in the P position. The N When pulling away, always position is used should it become visually check the position of the necessary to tow your truck. selector lever for safety. D (Drive) : The D position is for all Only push the button for gear normal forward driving. The system selection when necessary. automatically selects the gear Pushing the button unnecessarily according to the vehicle speed. may result in unintended gear Press the overdrive off switch (3) to selection. switch to the overdrive ON position Never move the selector to the P for greater fuel economy. position when the truck is in 2 (Second) : May be used when motion. driving on downhill roads or when the engine brake is required. Select Do not run the vehicle with the the 2 position at speeds below transmission in neutral. Not only will the engine brake not function, P (Parking) : Used when the 40 km/h (25 MPH) when traveling but the transmission will also be vehicle is parked or when starting down a moderate grade. Return the the engine. The P position is to be selector to the D position for normal damaged. You and others could used with the parking brake. The P driving. be seriously injured. and N positions are the two 1 (Low) : Used on steep downhill positions in which the engine can be roads or when strong engine When repeatedly shifting between started. braking is required. Return the forward and reverse gears for a R (Reverse) : Used when backing selector to the D position for normal multiple-point turn, firmly press the up the vehicle. Bring the truck to a driving. brake pedal and confirm that the complete stop before moving the vehicle is completely stopped before selector to the R position. operating the selector lever. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 215 For safety reasons, the shift lock mountain roads or through city system operates to prevent shifting centers, release the overdrive. of the selector lever to any position Doing so will reduce the number other than P unless the brake pedal of gear changes making the ride is pressed and the starter switch is smoother. in the ON position. When pulling . If your vehicle is traveling at a away, be sure to keep the brake speed exceeding pedal pressed as you operate the 101 km/h (63 MPH), it is not Overdrive Off Switch : Under selector lever. See Driver normal circumstances, press the 0 possible to downshift from 6th Information Center (DIC) 82, gear to 5th gear. overdrive off switch (3) to turn the Overdrive Off Light 0 78, Automatic overdrive OFF (the overdrive off Transmission 0 205, and Automatic . If your vehicle is traveling at a indicator light comes on). Transmission Shift Lock Control speed exceeding Press the switch again to release Function Check 0 274. 78 km/h (49 MPH), it is not possible to downshift from 5th the overdrive off (the overdrive off gear to 4th gear. indicator light goes off). See Overdrive Off Overdrive Off Light 0 78. Overdrive Off Switch Diesel vehicles have two overdrive gears (5th and 6th). These two high speed gears provide increased road speed, low running noise and outstanding fuel efficiency. Take advantage of overdrive whenever possible. . Use the overdrive during normal driving. When driving down long downhill roads that require the engine brake, or when driving on Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

216 Driving and Operating Overdrive Off Indicator Light Indicator light Function Usage conditions 6-Speed (4-speed + overdrive) automatic Goes Off. Use under normal driving conditions. change (Overdrive ON). Used when a light engine brake is required. 4-speed automatic change, but no change to Doing so will reduce the number of gear Comes On. overdrive (overdrive OFF). changes making the ride smoother on roads that have many hills.

. During cold weather, the Brakes transmission may not shift to the { Warning 5th or 6th gear (overdrive) until The braking distance on slippery the engine warms up. Antilock Brake System (ABS) road surfaces is longer than that . Even if the engine is stopped on a normal dry paved road even with the overdrive OFF, the Wheels may be locked and slip with an ABS-equipped vehicle. In overdrive will be ON the next during sudden braking or braking on addition the braking distance can time the engine is started. a slippery road surface such as a be slightly longer in deep snow snowy road. ABS is a device to and on a gravel road when ABS prevent the wheels from locking by is activated. Therefore, always detecting a slippery condition during keep in mind the road condition braking and securing the directional and tire condition (type of tires stability and handling stability of the and worn condition), observe safe vehicle. ABS only assists in limited road conditions and will not prevent (Continued) a crash if you exceed safe driving speeds for road conditions. Always drive safely. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 217 Driving in sand or on a muddy road . When ABS is operating, Warning (Continued) may adversely affect the brakes and vibration is felt on the brake ABS sensors. Wash the vehicle to pedal and steering wheel and driving habits and drive the remove sand and mud after you may hear the system vehicle while keeping a proper operating the vehicle in sandy or operating. This is normal when distance between vehicles. muddy conditions. ABS is properly operating. ABS does not prevent crashes if Before washing the vehicle, provide . The exhaust brake may release you do not drive safely. Drive the necessary protection to prevent when ABS is activated and the vehicle at a safe speed. water from being splashed on the exhaust brake is in operation. Install tires of the specified size, ABS components (sensors and . ABS is more likely to be same brand and same tread actuators). Especially when using activated when the brake is design (including winter tires) on high-pressure washing, be careful applied during cornering or not to allow water to be directly all wheels. If different tires are driving over a bump. This is sprayed onto the ABS components installed, the braking distance because inside wheels or and their harness connectors. becomes longer and directional wheels that have gone over a control stability of the vehicle These are not signs of ABS bump tend to lock. decreases. This is very malfunction: . ABS is not activated immediately dangerous. . Soon after you start the engine after starting the vehicle. It is Steering during sudden braking and the vehicle starts moving, activated only when the vehicle (when the ABS is working) will the sound of motor or valve speed reaches approx. 10 km/h working may be heard from the (6 MPH). ABS operation is feel slightly different than it does rear of the vehicle or underside inactive when the vehicle speed when the brakes are not applied. of the cab. This sound is from a reduces to approx. 5 km/h Operate the steering wheel self-check by the ABS system (3 MPH). carefully keeping this in mind. and is normal. In addition, you may also feel some vibration if the brake pedal is pressed at this time. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

218 Driving and Operating ABS Operation Indications and ‐ If the ABS warning light comes Signs on during driving Warning (Continued) ‐ The light does not come on when When braking suddenly, do not the engine control switch is pump the brakes (pushing and placed into the "ON" position releasing the brake pedal little by See Antilock Brake System little). Pumping brakes will (ABS) Warning Light 0 76. increase the braking distance. ABS warning light Even if a problem has occurred with The braking distance on slippery the ABS, the regular brakes will still road surfaces is longer than that Operation Indications of ABS work normally. However, ABS will on a normal dry paved road even When the engine control switch is not operate. with an ABS-equipped vehicle. placed into the "ON" position, the Precautions for Driving an When ABS is activated in the ABS warning light comes on and ABS-Equipped Vehicle following road surface conditions, then goes out in approx. 3 seconds. the braking distance may be The ABS is normal if the warning ABS is not a device that enables slightly longer compared to that of light goes out. driving and stopping under vehicles not equipped with an conditions exceeding safe driving ABS. Therefore, always be aware Operation Signs of ABS limits. Always drive safely. of the road and tire condition (tire When ABS is activated, slight type and wear condition), observe vibration is generated on the brake { Warning safe driving habits and drive the pedal (hydraulic brake model) and vehicle while keeping a safe steering wheel, and an operating When braking suddenly, continue following distance. sound can be heard from the ABS pressing brake pedal hard so that equipment. the ABS can take effect. ‐ When driving on a gravel road, or a road with a deep If the ABS warning light does any of (Continued) snow covering. the following, the ABS may be faulty. Please contact the nearest (Continued) dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 219 load due to acceleration or Warning (Continued) Warning (Continued) deceleration, thus preventing premature locking of the rear ‐ When tire chains are used. If powerful engine braking is wheels. ‐ When driving over road applied on a very slippery icy road, the drive wheels may be joints or bumps such as { Warning light reflectors on the road. locked (the ABS then does not work), resulting in loss of vehicle If a problem should occur with the ‐ When driving on a bumpy control. road, stone-paved road or EBD function, the ABS warning track. When ABS is activated, a slight light and the brake system vibration (especially when the warning light will come on ‐ When driving over an simultaneously. plate or manhole lid. road surface is different between right and left wheels) and pulling The rear wheels will lock more ABS does not work for wheel skid may be felt on the brake pedal easily if there is a problem with during a standing start, and steering wheel. In addition, the EBD function. Have it acceleration and cornering which an operating sound is produced checked and serviced at the do not involve braking. On a very from the ABS actuators. This nearest dealer as soon as slippery icy road, tires may lose does not indicate any abnormal possible. You and others could be grip and steering wheel operation condition. Stay calm and operate seriously injured. may not be able to control the the steering wheel properly. vehicle's direction, resulting in very unstable driving. Always When the EBD operates, the brake drive the vehicle observing a safe Electronic Braking force pedal may push back slightly or you speed well matched with both Distribution (EBD) may hear a sound similar to that road surface and tire conditions, EBD is a function that uses the ABS generated by the ABS when and avoid sudden braking. to distribute braking force ideally operational. Neither of them indicates any abnormal condition. (Continued) between the front and rear wheels in order to compensate for changes in load conditions or any shift of the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

220 Driving and Operating Parking Brake { Warning { Warning Parking Brake Lever Although the parking brake Do not use the parking brake When parking or stopping your indicator light will come on if the while the vehicle is in motion vehicle, engage the parking brake parking brake is engaged while except in an emergency. Applying and make sure that the vehicle does the engine control switch is in the the parking brake before the not start moving. Avoid parking your ON position, this does not mean vehicle has stopped can cause vehicle on a slope as much as possible and choose a level and flat the parking brake is fully the tires to lock or the vehicle to place. If parking on a slope is engaged, so always make sure spin, possibly causing an unavoidable, be sure to set the the lever is fully pulled up. accident. Unless the parking parking brake, make sure that the Never drive the vehicle with the brake is fully released during vehicle does not move, and block parking brake set as this will driving, a fault and/or a fire may the wheels with chocks for added cause excessive wear, reduce result. safety. parking brake effectiveness and If it was necessary to use the Illumination of the parking brake increase fuel consumption. parking brake during driving, be warning light does not mean that the Choose a flat place where sure to check afterwards to parking brake is fully applied. The stopping and parking are determine if any fault or failure parking brake lever must be fully permitted and where the vehicle has resulted. engaged. will not obstruct traffic. When you engage the parking brake lever, air pressure is reduced and all Remove all dirt from the vehicle's four wheel brakes are applied. light lenses and reflectors to ensure that the vehicle can be seen from other vehicles. You and others could be seriously injured.

Avoid parking for long periods with cargo on the vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 221 Operation of Parking Brake The parking brake indicator light in be checked by a qualified the instrument panel will come on technician. Adjustment may be when the lever is pulled up. Before required due to parking brake shoe you leave the driver's seat, follow wear. See Control of a Vehicle the steps under “Parking, or Leaving 0 139. Driver's Seat”. See Braking 0 143. Inspection To release the parking brake, hold the brake pedal down while pushing the release button of the parking brake lever and lower the lever. The parking brake indicator light in the instrument panel will go out. The parking brake indicator light is designed to remind you if the parking brake is not released when the engine control switch is on. If the parking brake warning light remains on when the parking brake lever is lowered, a brake failure or a drop in air pressure may be the Pull the parking brake lever slowly The parking brake lever is located to cause. from the fully released position while counting the clicks produced as the the right of the driver's seat. Check the brake air pressure for lever engages ratchet plate notches To set the parking brake, completely correct level. If the brake air to check that it can be raised the stop the vehicle. Then, without pressure is low, contact your local proper amount and the lever is held pressing the release button (1), hold Isuzu Dealer for service. firmly. the brake pedal down while pulling If you notice the parking brake lever the parking brake lever (2) all the travel has increased over time, this way up. means the cable adjustment must Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

222 Driving and Operating If the number of notches is not The exhaust brake will disengage within the standard value range when the accelerator pedal or brake below, adjust it to the standard pedal is pressed. Releasing the value. Lever is 6 to 8 pedal reengages the exhaust brake. notches. Push the lever forward to turn the Number of notches before parking exhaust brake off during idling. brake is set when lever is pulled slowly from released position with { Warning pull force of about 147 N (15 kgf/ 33 lbs). It is extremely dangerous to apply See Maintenance Schedule 0 327 the exhaust brake on slippery and Additional Maintenance and roads as the tires can skid. Care 0 346. You and others could be seriously injured. Exhaust Brake Exhaust Brake Switch Even if the selector lever is placed When turned on, the system in the N position, the exhaust brake increases the amount of power does not disengage until the engine absorbed by the engine while To turn on the exhaust brake system is warmed up if the warm-up system coasting in gear. Whenever slowing while driving, pull the lever is on. down the vehicle, such as on down backward. The exhaust brake grades, in city traffic or approaching indicator light comes on. The stop signals, this brake system may exhaust brake will engage be used. automatically when the accelerator pedal is released and vehicle speed is above 10 km/h (6.5 MPH). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 223 Conditions for Inoperable Exhaust It is advisable to operate the Cruise Control Brake exhaust brake when descending a The cruise control function allows Under the following conditions, the slope or when stop and go driving is you to drive the vehicle at a exhaust brake does not engage involved. constant speed without operating even if the exhaust brake indicator The selection of transmission gears the accelerator pedal. Use this light comes on: and engine speed when operating function when the vehicle speed is the brake system is important. The . The accelerator pedal is between 40 to 160 km/h (25 to 100 exhaust brake is more effective in pressed. MPH). This function should only be the lower gears and at the higher used when driving without frequent . The selector lever is in the N engine speeds. See Exhaust Brake starts and stops. position. Light 0 77. . The vehicle is traveling at { Warning 5 km/h (3 MPH) or lower speeds. If your vehicle is equipped with an Cruise control can be dangerous anti-lock brake system (ABS), the where you cannot drive safely at exhaust brake may disengage a steady speed. Do not use during ABS operation even when cruise control on winding roads or the exhaust brake switch is in the in heavy traffic. You and others ON position and the exhaust brake could be seriously injured. indicator light is on. The exhaust brake may disengage temporarily as Cruise control can be dangerous the vehicle passes over a bump on slippery roads. On such roads, even when the brake pedal is not fast changes in tire traction can pressed. cause needless wheel spinning, and you could lose control. Do not use cruise control on slippery roads. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

224 Driving and Operating

At the same time the cruise set indicator light comes on. Accelerating during Cruise Control Driving If you want to accelerate temporarily 1. Press the cruise control main 2. Use the accelerator pedal to to pass another vehicle while driving switch to turn it on. adjust the vehicle to the using the cruise control, press the desired speed. Upon reaching accelerator pedal. When you the desired speed, turn the release the accelerator pedal, the cruise control set switch. The speed returns to the original set vehicle speed at the moment vehicle speed. you operate the switch is set in the system, enabling you to drive with the set speed At this time, the cruise main automatically maintained indicator light comes on without using the accelerator simultaneously. pedal. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 225 When Increasing Vehicle Speed When Increasing Vehicle Speed at the decreased vehicle speed. Slightly If you want to decrease the speed If the cruise control resume switch is quickly, press the brake pedal to operated and released immediately, cancel cruise control and decelerate the set vehicle speed increases to the desired vehicle speed. Then, 1.6 km/h (1 MPH) per operation. operate the cruise control set This operation can be performed 10 switch. times consecutively. When Decreasing Vehicle Speed When Decreasing Vehicle Speed Slightly If the cruise control set switch is operated and released immediately, the set vehicle speed decreases 1.6 km/h (1 MPH) per operation. This operation can be performed 10 When the cruise control resume times consecutively. switch is operated, the speed increases while the switch is held. After the speed is increased to the desired vehicle speed, and the switch is released, the speed is set at the increased vehicle speed. If you want to increase the speed quickly, press the accelerator pedal and accelerate to the desired When the cruise control set switch vehicle speed. Then, operate the is operated, the speed decreases while the switch is held. cruise control set switch. After the speed is decreased to the desired vehicle speed, and the switch is released, the speed is set Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

226 Driving and Operating When Canceling Cruise Control . When the vehicle speed may have to brake or shift to a lower decreases more than 20% below gear to keep your speed down. Of your set speed. course, applying the brake takes . When the cruise control main you out of cruise control. Many switch is turned off. * drivers find this to be too much trouble and do not use cruise . When the engine control switch control on steep hills. is turned to the LOCK position. * When Returning to Cruise Control . When trouble develops in the Driving system. * If you have canceled cruise control Memory speed is eliminated. * under the following conditions, you When you do not use the cruise can return to the cruise control control, be sure to place the cruise driving condition before cancellation control main switch into off. when you operate and release the Press the cruise control main switch cruise control resume switch. The again to turn the cruise control When you place the engine control moment the resume switch is system off. The cruise control main switch into ACC, place the cruise released, the cruise set indicator indicator light will go out. control main switch into off, then light comes on. reset the cruise control if you want The cruise control set speed is to use the cruise control again. . When pressing the brake pedal. canceled in the following cases: Using Cruise Control on Hills . When the selector lever is . When the brake pedal is shifted to the N position. pressed. How well your cruise control will work on hills depends upon your When the vehicle speed decreases . When the selector lever is to 40 km/h (25 MPH) or less, it is shifted to the N position. speed, load and the steepness of the hills. When going up steep hills, not possible to return to the cruise . When cruising speed is you may want to step on the control driving. You must reset the approximately 27 km/h (17 accelerator pedal to maintain your cruise control. MPH). * speed. When going downhill, you Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 227 If the cruise control is turned back The maximum slope angle at which Fuel on while the vehicle speed exceeds the system can control the vehicle what is set prior to the cancellation speed increase is different of cruise control, the set vehicle depending on the load the vehicle is Fuel for Diesel Engines speed cannot be changed until the carrying. Diesel Fuel Requirement and vehicle reaches to the set speed. Fuel System Also, the vehicle speed must be 1 Automatic Activation and Automatic Release of Exhaust MPH below the previously set Fuel Requirements Brake vehicle speed. Use of fuels other than ultra The exhaust brake is engaged when If you hold the switch at the +RES low-sulfur fuel may not conform to the vehicle speed exceeds the set position, the vehicle will keep going emission regulations. speed on a downhill slope. faster until you release the switch or The fuel supply pump, injector or apply the brake. So unless you want The exhaust brake is disengaged other parts of the fuel system and to go faster, do not hold the switch when the vehicle slows down close engine can be damaged if you use at the +RES position. to the set. any fuel or fuel additive other than Exhaust Brake Function those specifically recommended by the dealer. Diesel Vehicles Equipped with Exhaust Brake-interlocked Cruise To help avoid fuel system or engine damage, pay attention to the Automatic activation of the exhaust following: brake during cruise control driving suppresses an increase in the . Some service stations mix used speed on a downhill slope, engine oil with diesel fuel. Some decreasing the need for the driver to manufacturers of large diesel apply the regular brake pedal. The engines allow this; however, for exhaust brake does not activate your diesel engine, do not use when the exhaust brake switch is diesel fuel which has been turn off. contaminated with engine oil. Besides causing engine Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

228 Driving and Operating damage, such fuel can also 1-D fuel (if available) or use a Biodiesel affect emission control. Before "winterized" Number 2-D (a blend of using any diesel fuel, check with Number 1-D and Number 2-D). This Biodiesel, may also be referred to the service station operator to blended fuel is usually called as FAME blended (Fatty-acid methyl see if the fuel has been mixed Number 2-D also, but can be used ester) fuel is a renewable fuel with engine oil. in colder temperatures than Number produced from vegetable oils or animal fats that have been . Do not use any fuel additive 2-D fuel which has not been "winterized". Check with the service chemically modified to make it (other than as recommended compatible with diesel fuel. under "Biocides" in Water in station operator to be sure you get Fuel 0 231). At the time this the properly blended fuel. manual was printed, no other Do not use fuels other than those Caution fuel additive was recommended. recommended in this manual. Doing Do not use home-made biodiesel (See your authorized dealer to so may adversely affect the engine. or home test kits because the find out if this has changed.) DIESEL FUEL/APPLICABLE quality cannot be verified by . Take care not to run out of diesel STANDARD (Sulfur content below approved scientific methods. Do fuel. If you do run out of fuel, 15ppm) not use raw vegetable oil or other you may need to bleed air out of ASTM Based on D975 unmodified bio-oils, fats, the supply pump to re-start the (AMERICAN Number 1–D or blends of vegetable oil with engine after fuel has been filled. SOCIETY FOR S15 or Number diesel. They could damage the Your vehicle is designed to use TESTING and 2-D S15 (below fuel system and engine, and either Number 1-D or Number 2-D MATERIALS) 15 ppm) damages would not be covered diesel fuel. However, for better fuel by the vehicle warranty. economy, use Number 2-D diesel fuel whenever possible. At temperatures below -7 °C (20 °F), Number 2-D fuel may pose operating problems (see "Cold Weather Operation" which follows). At colder temperatures, use Number Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 229 fuel. Storage at hot ambient Fuels improperly blended for cold Caution temperatures will accelerate temperature operation may result in biodiesel degradation. restricted fuel filters and degraded Do not use blends containing vehicle performance. The vehicle is more than 20% biodiesel. Any Owners who use very little fuel, or who have vehicles or fuel stored equipped with a fuel heating system engine, fuel system, or exhaust to provide a level of protection after-treatment system damage for extended periods of time, should avoid the use of biodiesel blended against filter plugging from gelling or would not be covered by the waxing of conventional diesel fuel vehicle warranty. fuels above 5% by volume. When vehicles are stored for longer than and biodiesel blends. If the one month, they should be run out operating temperature is far below As a renewable fuel, biodiesel of biodiesel to below one-quarter the temperature at which gelling or provides some environmental tank, refueled with Ultra Low Sulfur waxing of the fuel occurs, the benefits. However, biodiesel has Diesel fuel, and driven several miles system will not prevent all cases of unique properties and needs to be before storage. filter plugging. handled differently than diesel fuel. At temperatures below 0 °C (32 °F), If the vehicle experiences a fuel Its use presents additional risks and it is recommended to switch to Ultra filter restriction, the on-board may not be appropriate in all Low Sulfur Diesel fuel with no monitoring system will alert the situations. Certain vehicle operating biodiesel content, or to blends with driver that the fuel filter requires modes increase these risks and biodiesel containing less than 5% by service. The fuel filter, however, will should be avoided. Read further to volume. At these extreme cold not prevent all damage caused by determine if your driving habits are temperatures, biodiesel blends poor quality biodiesel. compatible with the use of biodiesel. higher than 5% by volume may Biodiesel Blends Biodiesel fuel quality degrades with cause fuel filter plugging and time and exposure to high system gelling, which can lead to Use biodiesel blends that meet the temperature quicker than Ultra Low vehicle operability problems. ASTM specification D6751. Sulfur Diesel fuel. More frequent Retail pumps dispensing blends refueling provides the best containing up to 5% biodiesel (B5) opportunity to have a supply of fresh are not required to be labeled with the concentration of biodiesel. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

230 Driving and Operating Blends up to B5 must meet ASTM To reduce the risk of poor quality D975 (Grades No. 2-D or No. 1-D fuel, purchase biodiesel blends from S15 Ultra Low Sulfur Diesel). When a fuel supplier or fueling station refueling with a biodiesel blend which sells BQ-9000 certified above B5, one of the following biodiesel. See www.bq-9000.org for labels should appear on the a list of certified marketers. dispenser: Biodiesel Blends in Canada Caution Biodiesel blends that meet the CAN/ CGSB-3.522 specifications up to Do not use blends containing 20% (B20) can be used. Do not use more than 20% biodiesel. Any biodiesel blends above 20%, as engine, fuel system, or exhaust they may damage the engine and after-treatment system damage fuel system. would not be covered by the vehicle warranty. Cold Weather Operation Diesel fuel is sensitive to temperature. All diesel fuel has a certain amount of paraffin components, which are high in energy value and help improve fuel economy. But, when temperatures are below -7 °C (20 °F), the paraffin components begin turning into wax Blends containing more than 5% flakes. If temperatures are low and up to 20% biodiesel must meet enough, these flakes can obstruct ASTM specification D7467 the fuel filters and stop fuel from (Biodiesel blend, B6 - B20) and are reaching the engine. labeled with an orange or blue label. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 231 At low temperatures, wax flakes are Water in Fuel more likely to form in Number 2-D Warning (Continued) fuel than in Number 1-D (or During refueling, it is possible for "winterized" Number 2-D) fuel. For water (and other contaminants) to Be sure you do not overfill the best operation at temperatures be pumped into your fuel tank along drain pan. Heat (such as from the below -7 °C (20 °F), use Number with the diesel fuel. This can occur if engine) can cause the fuel to 1-D, or Number 2-D which has been a service station does not regularly expand. If the container is too full, blended with Number 1-D for winter inspect and clean its fuel tanks, or if fuel could be forced out of the use. When temperatures are a service station receives pan. This could lead to a fire and consistently below (or near) -18 °C contaminated fuel from its the risk of personal injury and/or (0 °F), use Number 1-D if at all supplier(s). vehicle damage. possible. Bear in mind, however, To protect your engine from that even Number 1-D fuel will form contaminated fuel, there is a water Biocides wax flakes when temperatures are separator system on the engine extremely low. which allows you to drain excess In warm or humid weather, fungus, water from the fuel. and/or bacteria may form in diesel Do not use home heating oil or fuel if there is water in the fuel. gasoline in your diesel engine; either may cause engine damage. { Warning Fungus or bacteria can cause fuel system damage by plugging the fuel The addition of kerosene will not The drained water/diesel fuel lines, fuel filters or injector. They unplug a filter plugged with wax. mixture is flammable, and could can also cause fuel system Warming a "waxed" filter to a be hot. To help avoid personal corrosion. temperature of 0 °C to 10 °C (32 °F to 50 °F) will return the wax to injury or death and/or property If fungus or bacteria has caused fuel solution. Filter replacement is not damage, do not touch the fuel system problems, you should have normally required. coming from the water separator your authorized dealer correct these drain valve, and do not expose problems. Then, use a diesel fuel the fuel to open flames or sparks. biocide to sterilize the fuel system (Continued) (follow the biocide manufacturer's instructions). Biocides are available Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

232 Driving and Operating from your dealer, service stations, Fuel will be mixed in the drained parts stores and other automotive Caution water. Dispose of it in a method places. See your authorized dealer conforming to the regulatory for advice on using biocides in your Remaining water that is not requirements in your state. discharged from the water area and for recommendations on If the water separator (fuel filter) which biocides you should use. separator could freeze and damage the vehicle. requires frequent draining, have the Smoke Suppressants fuel system inspected at your If the warning light comes on dealer. Because of extensive testing of while the engine is in operation, treated fuel versus untreated fuel, promptly drain the water from the the use of a smoke suppressant water separator (fuel filter). additive is not recommended Continuing to drive with the light because of the greater possibility of remaining on could damage the stuck rings and guttered valves, fuel injection system. If this resulting from excessive ash deposits. happens, have the vehicle checked and serviced by the Water Separator nearest dealer. The purpose of the water separator is to separate any water from the Draining Water from the Fuel fuel that may have formed in the Filter fuel tank due to condensation. Clean off any fuel that has adhered Pre Fuel Filter (Chassis-side) The water separator is located on to the vehicle body. the bottom of the fuel filter. 1. Attach a plastic hose to the Starting the engine immediately drain plug (2) on the bottom of after draining the water from the fuel the chassis-side fuel filter and filter requires a little more time than put the other end of the hose in usual. If the engine does not start in a container placed beneath the 10 seconds, wait for a while and try filter. again. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 233 2. Loosen the drain plug and Running Out of Fuel move the priming pump (1) up and down by hand between When the Fuel Tank is Empty 10 and 20 times. 3. Fully tighten the drain plug (2) and move the priming pump (1) several times. Fuel Filter (Engine-side)

2. Loosen the drain plug and move the priming pump up and down by hand between 10 and 20 times. 3. Fully tighten the drain plug and When the fuel tank is empty, air will move the priming pump several enter the fuel system, so refueling times. alone will not be enough to restart the engine. Use the following 4. Test run the engine and check methods to bleed the fuel system. that there are no fuel leaks 1. Attach a plastic hose to the from the drain plug of the Bleeding the Fuel System drain plug (2) on the bottom of engine-side fuel filter. Also Steps for Refueling the engine-side fuel filter (1) check that the water separator and put the other end of the (fuel filter) warning light 1. Follow the directions in hose in a container placed stays off. "Parking Brake Lever" under 0 beneath the filter. Parking Brake 220. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

234 Driving and Operating 2. Select the correct fuel (See Before Starting the Engine 4. Fully retighten the air bleed "Diesel Fuel Requirement and plug (2) and wipe off any fuel Fuel System"). Follow any that may have adhered to the posted safety rules. Stand to plug or surrounding area. the side, never above or 5. Continue to operate the pump opposite the filler opening. for 50 times. 3. Check that the fuel cap is tight, 6. Start the engine. and see to it that engine oil, engine coolant in the reservoir, 7. If the engine does not start, and washer fluid, etc. are at repeat steps 5 and 6 as proper levels. Then do the necessary until it does start. Driver Daily Checklist. After Starting the Engine See Owner Checks and Services 1. Without pressing the 0 340. 1. The priming pump (1) is accelerator pedal, start the Driving your vehicle until the fuel located on the outboard side of engine. tank is empty may activate the the left frame rail, in front of the 2. After the engine has started, check engine malfunction indicator batteries. Place a container allow it to idle for about light. You do not need to have your beneath the air bleed plug (2) 5 seconds. vehicle checked. After refueling, to receive fuel, and then fully 3. Fully press the accelerator perform the following: loosen the plug. pedal and increase the engine . Bleed the fuel system. 2. Attach a clear hose onto the air speed to the maximum speed . Start, turn off and restart the bleed plug, direct the clear for 10 seconds. (Repeat this engine three or four times. hose into a catch pan. operation several times.) . The check engine malfunction 3. Pump the priming pump (1) up/ indicator light will be cancelled. down for 65 times to get most of the air bubbles out. Note fuel was drawn into the filter bowl at around 40 - 50 times. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 235 Insufficient air bleeding can result in faulty engine operation. Be sure, { Warning Warning (Continued) therefore, to always carry out the previous steps under "After starting Fuel vapor is highly flammable. He/she could pick up another the engine". Be careful not to inhale fuel vapor charge of static electricity by when refueling the vehicle. doing so. Filling the Tank If you have a static charge Obey all cautions posted in filling Be sure to obey the following buildup on your body while stations. instructions when refueling the refueling the vehicle, a spark vehicle: caused by its discharge could . Stop the engine and close the ignite the fuel, resulting in burns. vehicle's doors and windows. All parts of the refueling . Keep cigarettes and other procedure (from opening the fuel flames away from the vehicle. tank filler cap to completing the refueling and closing the fuel tank . Before opening the fuel tank filler cap, touch a metallic object filler cap) must be performed by to discharge static electricity the same person. from your body. Other people may be carrying . When filling, place the nozzle static electricity. Do not allow deeply into the fuel tank. If you them to approach the fuel filler. Type A try to fill more fuel by pulling out The person performing the the nozzle from the fuel tank, the refueling procedure must not In the case of Type A, grip the tab of fuel may spill out, thus causing return to the seat in the cab the fuel tank filler cap when turning danger. part-way through the procedure. the cap to open or close. . Be sure to wipe off the fuel that (Continued) is spilled at refueling. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

236 Driving and Operating

{ Warning Conversions and Add-Ons Fuel may be under pressure. Be sure to slowly open the fuel tank Add-On Electrical filler cap. If you open it quickly, fuel may spurt out. You and Equipment others could be seriously injured. Installing Electrical Equipment

{ Warning Caution Inappropriate installation or Type B Care must be taken when filling removal of audio, radio or other After refueling, make sure that the the fuel tank to prevent entry of electrical equipment can fuel tank filler cap is tightly closed. dirt and water. adversely affect other electrical equipment and cause a Do not use any fuel tank filler cap breakdown or fire. Be sure to that is not a genuine GM part. have electrical equipment The use of an improper fuel tank installed or removed by your filler cap could cause fuel spillage in dealer. You and others could be the event of a crash. The use of an seriously injured. improper fuel tank filler cap could also affect the fuel system and the emission control system. Do not install any unauthorized radio set, or any radio set or Be sure to wipe off the fuel that is antenna that does not comply with spilled at refueling. relevant standards. Noise from the radio set could cause electromagnetic interference with the vehicle's electronic equipment Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Driving and Operating 237 and other systems, resulting in a Installations, or alterations to the vehicle breakdown or in a original equipment vehicle or malfunction of electronic equipment. chassis, as manufactured and Consult your dealer if you wish to assembled by General Motors, are install radio equipment. not covered by this warranty. The body company, assembler, Power Take-Off (PTO) or equipment installer is solely responsible for warranties on the If equipped, the PTO is a device body or equipment and any that is used to provide engine power alterations to any of the parts, to special equipment directly from components, systems, the engine or through the or assemblies installed by GM. transmission. For details about the Examples include, but are not PTO operation, refer to the separate 1. Engine Speed Control limited to, special body installation, instruction manual provided by its Switch such as recreational vehicles, the maker. 2. Main Switch installation of any non-GM part, If the optional PTO function is used cutting, welding, or the for long periods of time, make sure { Warning disconnecting of original equipment to regularly check the diesel vehicle or chassis parts and particulate filter (DPF) indicator. In PTO mode, Cruise Set/Resume components, extension of the Automatic DPF regeneration will not Switch can be used exactly the wheelbase, suspension, and take place while the PTO function is same as PTO Engine Speed driveline modifications, and axle active. Control Switch. Improper additions. operation of these switches may The engine control module (ECM) cause personal injury or damage. has the ability to accommodate one of three different PTO modes. Each When Operating the PTO mode can be programmed to accommodate many PTO devices. For operation of special equipment, see the manufacturer’s instructions. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

238 Driving and Operating Optional PTO switches are available from your dealer to ease installation of a PTO. The optional PTO main switch and PTO engine speed control switch can be used increase the engine idle r/min without additional programming. Pressing the PTO main switch once will activate the PTO mode and raise the idle up speed up to the preset 800 r/min. Once in PTO mode the PTO engine speed control switch can be used to adjust the idle speeds between the preset 1,300 and 1,700 r/min. Moving the selector lever from park or neutral, applying the brake pedal or releasing the parking brake will cancel PTO mode and return the engine idle speed to normal. For additional details about PTO programming, contact your dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 239 Fuel Filter ...... 270 Wheels and Tires Vehicle Care Rear Axle (Gear Oil Viscosity Wheels and Tires ...... 295 Chart) ...... 271 Tire Pressure ...... 307 General Information Rear Axle (Oil Level Tire Rotation ...... 307 Check) ...... 272 If a Tire Goes Flat ...... 310 General Information ...... 240 Noise Control System ...... 272 California Proposition Automatic Transmission Shift Jump Starting 65 Warning ...... 240 Lock Control Function Jump Starting - North California Perchlorate Check ...... 274 America ...... 311 Materials Requirements . . . . . 240 Wiper Blade Replacement . . . . 275 Accessories and Towing the Vehicle Modifications ...... 240 Headlamp Aiming Towing the Vehicle ...... 315 Vehicle Checks Headlamp Aiming ...... 277 Appearance Care Doing Your Own Bulb Replacement Exterior Care ...... 317 Service Work ...... 241 Bulb Replacement ...... 277 Interior Care ...... 323 Cab Tilting ...... 243 Headlamps and Front Turn Engine Compartment Signal ...... 280 Overview ...... 244 Roofmarker Lamps ...... 284 Engine Cover ...... 245 Sidemarker Lamps (Including Engine Oil ...... 245 Turn Signal and Cornering Automatic Transmission Lamps) ...... 284 Fluid ...... 251 Taillamps, Turn Signal, Engine Air Cleaner/Filter ...... 253 Stoplamps, and Back-Up Engine Coolant ...... 253 Lamps ...... 286 Engine Overheating ...... 259 License Plate Lamp ...... 286 Power Steering Fluid ...... 262 Interior Lamps ...... 287 Washer Fluid ...... 262 Brakes ...... 263 Electrical System Brake Fluid ...... 268 Electrical System Overload . . . 287 Battery - North America ...... 269 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

240 Vehicle Care General Information See Battery - North America 0 269 Accessories and and Jump Starting - North America Your authorized dealer has trained 0 311 and the back cover. Modifications technicians and genuine parts to Factory-Approved Accessories service your vehicle properly. For California Perchlorate expert advice and quality service, Your dealer can furnish a wide see your authorized dealer. Materials Requirements range of comfort, convenience, and Certain types of automotive safety accessories, especially California Proposition applications, such as airbag designed for you and your new 65 Warning initiators, seat belt pretensioners, truck. They can install all of the and lithium batteries contained in safety accessories you will need to remote keyless transmitters, may comply with local, state and D.O.T. { Warning contain perchlorate materials. regulations and advise you how to Special handling may be necessary. comply with these regulations. Most motor vehicles, including For additional information, see Be sure to ask your authorized this one, as well as many of its www.dtsc.ca.gov/hazardouswaste/ dealer about the accessories. service parts and fluids, contain perchlorate. and/or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Engine exhaust, many parts and systems, many fluids, and some component wear by-products contain and/or emit these chemicals. For more information go to www.P65Warnings.ca.gov/ passenger-vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 241

Vehicle Checks Warning (Continued) Warning (Continued) Doing Your Own personal injury, or damage to the Performing maintenance work on Service Work vehicle or its equipment. If you a truck or chassis can be have any questions about dangerous. In trying to do some Precautions for Checking and carrying out some service, have jobs, you can be seriously injured. Adjustments the work done by a skilled Do your own maintenance work Your authorized dealer has trained technician. only if you have the required technicians and genuine parts to To prevent personal injury, keep know-how and the proper tools service your vehicle properly. For hands, tools and clothing clear of and equipment for the job. If you expert advice and quality service, the engine cooling fan when the have any doubts, contact your see your authorized dealer. engine is running. dealer. The engine, exhaust pipe and You and others could be seriously { Warning radiator will be hot immediately injured. To help avoid personal injury, take after the vehicle is driven. Be care when doing any careful around these parts to Pull firmly on the parking brake maintenance or making any prevent burns. Perform all checks lever and move the selector lever to check or repair. Follow when the engine is cold. "P" and make sure the shift indicator displays "P". manufacturer's instructions for all Do not perform work near an materials used during service and open flame or other heat sources. Make sure to turn off the engine and maintenance of this vehicle. remove the key from the engine Do not let the engine run in poorly If used or handled improperly, control switch before performing any ventilated garages or sheds. This they may be hazardous. Improper checks. could cause carbon monoxide or incomplete service can also poisoning. Select a place with a solid and level affect the vehicle and result in surface to perform the checking and (Continued) (Continued) maintenance work. Make sure to Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

242 Vehicle Care chock the wheels. It would be very Oils, brake fluid and engine coolant refuse from coming in contact with dangerous if the vehicle started have lubrication, cooling and rust parts or materials that have been to move. prevention functions. If these liquids removed when changing or When performing work on the deteriorate through loss or replenishing them. electrical system, begin by turning contamination, it will cause a Do not step on the engine or climb the engine control switch to the decline in the performance of the onto it. You could cause an engine "LOCK" position, wait at least parts and such problems as seizure failure by, for example, damaging 3 minutes, and then disconnect the or malfunctioning. Replenish or the cover or various negative cable from the negative change these liquids when connectors. terminal on battery. If the negative performing the checks (daily and cable is disconnected within periodic checks) as required by the Electric Welding relevant regulations or in 3 minutes, the engine control Careless electric welding of vehicle accordance with the Maintenance module may malfunction. parts can cause welding current to Schedule (when either the specified flow back through the vehicle s When working on the fuel line or driving distance or period of time, ’ ground circuit and damage electrical fuel filter, remove the fuel tank filler whichever comes first, has expired). cap. The fuel system is under and electronic parts so that they do pressure and the fuel will overspill Confirm that all systems and not function normally. Whenever unless the pressure is relieved, components are normal after electric welding is necessary, possibly leading to combustion or performing the work. consult your dealer. a fire. Do not leave the removed parts or Do not make engine adjustments tools in the engine compartment. yourself. Be sure to consult your They could damage the equipment if dealer. caught in the belts or other moving components. Use only appropriate tools. Dirty water, dirt and other impurities seriously impair the effectiveness of the oil, grease and fluids, and damage the parts. Exercise all due caution to prevent waste or other Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 243 Cab Tilting Tilting the Cab Before Tilting the Cab (Single Cab 1. Check that all personnel are Model) clear of the cab.

{ Warning

To help avoid personal injury and property damage: . Park the vehicle on level ground and check that there is enough space in front of and above the cab. 3. Hold the assist handle (3) and . Set the parking brake firmly pull the safety hook (4). and block the front wheels. . Move the selector lever in the "P" position. 2. Unlock the handle (2) while pulling the lever (1). . Secure loose articles in the cab. . Stop the engine. . Close the cab door. . Keep the area surrounding the cab clear. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

244 Vehicle Care 4. Raise the cab fully and be sure 3. Hold the assist handle (3) and Engine Compartment the cab support (5) is locked by unlock the cab support by the support lock lever (7). pulling the support rearward Overview 5. Insert the safety lock pin (6). while pressing the support lock lever (7). Always be sure the safety lock pin is installed when the cab is tilted. 4. Lower the cab and push the handle (2) down firmly to lock. { Warning { Warning To help avoid personal injury or To help avoid personal injury or death, keep hands, tools, and death, be sure the tilt cab is clothing clear of the engine securely locked in the lowered cooling fan when the engine is position before operating the running. vehicle. You and others could be seriously You and others could be seriously injured. injured.

Lowering the Cab 1. Have all personnel stand clear of the cab. 2. Remove the safety lock pin (6). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 245 Engine Cover Engine Inspection Sub Cover Engine Coolant Reserve Tank (Crew Cab Model) Inspection Cover (Crew Cab Engine Inspection Cover (Crew Model) Cab Model)

To gain access to the engine compartment, pull the lock lever To gain access to the engine To gain access to the engine, (red) (1) on the driver’s seat coolant reserve tank, remove the release the catch hooks (3) and cushion (2) to unlock it, raise the inspection cover located under the raise the passenger’s seat driver’s seat cushion and remove rear left seat. cushion (2). The cover can be held the sub cover. up by a strap (1), permitting engine Engine Oil inspection and adjustment. Engine oil is an important factor determining engine performance and longevity. Be sure to use only the specified oil and oil filters. The engine oil level must be checked Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

246 Vehicle Care and the oil should be changed Access to the Engine Checking the Engine Oil Level regularly according to the Maintenance Schedule. Single Cab Model The engine oil performs the Access to the engine oil dipstick is following important functions: located on the engine left side after tilting the cab. See Cab Tilting . It prevents engine parts from 0 243. becoming worn. Crew Cab Model . It cools engine parts. . It cleans engine parts. . It seals the combustion chambers and prevents rust. Replace the engine oil at regular intervals. Press the engine oil level check When particulate matter (PM) has switch. If engine oil level is low the accumulated to a preset level in the red oil pressure warning light will diesel particulate filter (DPF), the turn on. If the engine oil level is filter is automatically regenerated above the "OK", the green oil level through combustion. To make this indicator will turn on. regeneration (combustion) possible, The oil level varies while the engine a small amount of fuel is injected The engine oil dipstick is under the is running, right after it is stopped, into the engine combustion chamber engine inspection sub cover located and on sloping ground. When after firing. This causes fuel to beneath the driver's seat. checking the oil level, be sure the gradually become mixed with the vehicle is on level ground while the engine oil, and the engine oil level engine is cool. may rise beyond the original level. This does not indicate a malfunction of the engine. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 247 The engine oil level must be kept at The oil level cannot be checked the right level to help assure proper correctly when the engine is lubrication of your vehicle's engine. running. It is the owner's responsibility to If the engine has been running, wait check the oil level at regular at least 30 minutes before checking. intervals (such as every fuel stop), according to the following Adding the Engine Oil instructions. Park the vehicle on a level surface and check the engine oil level before starting or at least 30 minutes after turning off the engine. 2. Reinsert the oil dipstick fully and then gently remove it. The oil is at the correct level if the oil level is between the "FULL" and "MIN" marks. 3. If the oil level is too low, add oil to the "FULL" mark. 4. Reinstall the oil dipstick into When the engine oil level is near or position after checking the oil below the "MIN" mark on the oil level. dipstick, remove the oil filler cap (1) and add the oil. Remove the oil Any oil level above the "FULL" mark dipstick (2) at this time. Use only the 1. Remove the oil dipstick (2) and on the oil dipstick may cause engine specified engine oil. wipe off any oil on the oil malfunctions. dipstick. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

248 Vehicle Care Prevent dirt from entering the filler Consequently, the maintenance Caution port when adding the oil. If foreign interval of the DPF filter will be matter mixes with the oil, it could reduced. When adding oil, be careful not to damage the engine. spill any, but keep a workshop rag Oil Identification Logo handy just in case there are any Adding oil above the "FULL" mark spills. If any oil should spill onto on the oil dipstick could result in the engine, carefully wipe it away. faulty engine operation. Be sure to If this precaution is not taken, the check the oil level by using the oil dipstick. spilled oil could ignite and a fire could spread. Failure to use the recommended engine oil could result in engine or Do not leave flammable items, DPF breakdown, or in poor fuel such as rags or gloves, in the efficiency. Be sure to use the engine compartment. They could recommended engine oil. cause a fire. You and others could be seriously injured. Choosing the Right Quality Oil If you do not use the oil intended for Engine oil lubricates and cools the a vehicle equipped with a Diesel A logo (symbol) is used on most oil engine's internal components. The Particulate Filter (DPF), both the containers to help you select the oil quality of the oil is degraded and the engine and the DPF may break you should use. The top portion of quantity of oil is reduced by down and fuel economy may the logo shows the oil quality by API evaporation, discharge and decrease. Be sure, therefore, to use designations such as CK4 or others. combustion during the operation of the oil intended for vehicles The center portion of the logo the engine. Continually using the equipped with DPF. shows the SAE viscosity grade, same oil without checking the level, GM recommends engine oil that such as SAE *W-40 (* indicates or without replenishing and supports DPF (Low ash oil). Use of viscosity on the low temperature changing it could cause seizure or engine oil that does not support low side). You should look for this logo damage to the engine. ash will increase the PM produced on the oil container, and use ONLY by engine combustion. oil containing the logo. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 249 Change Intervals Engine Oil Additives Engine Oil The oil and oil filter change intervals Engine oils contain a variety of Engine oil viscosity (thickness) has for your engine are based on the additives. Your engine should not an effect on fuel economy and use of recommended oil quality and need any extra additives if you use cold-weather starting. Lower viscosity, as well as high-quality the recommended oil quality and viscosity engine oils can provide filters such as genuine GM oil filters. change intervals. better fuel economy; however, Using oil other than recommended, higher temperature weather or oil and filter change intervals { Warning conditions require higher viscosity longer than recommended, could engine oils for satisfactory reduce engine life. Damage to Used engine oil contains harmful lubrication. engines due to improper contaminants that have caused When choosing an oil, consider the maintenance or use of incorrect oil skin cancer in laboratory animals. range of temperature your vehicle quality and/or viscosity is not Avoid prolonged skin contact. will be operated in before the next covered by the new vehicle Clean skin and nails thoroughly oil change. Then, select the warranty. using soap and water–not mineral recommended oil viscosity from the Your engine was filled with a oil, fuels or solvents. Launder or chart. high-quality engine oil when it was discard clothing, shoes or rags Do not use any viscosity of oil not built. You do not have to change this containing used engine oil. recommended. Such oils could oil before the first recommended cause engine damage. change interval. Oil and filter change intervals depend on how Engine Oil and Gear Oil you use your vehicle. For Viscosity Charts information on the proper oil and Select appropriate engine oil in filter change intervals. See accordance with the table below. Maintenance Schedule 0 327. It is also important to select the viscosity appropriate for the temperature at which your vehicle operates. Use the following table for making correct selections. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

250 Vehicle Care Failure to use the recommended engine oil could result in engine or DPF breakdown, or in poor fuel efficiency. Be sure to use the recommended engine oil. Engine oil change precaution: . When adding oil, remove the dipstick. . After adding oil, wait for at least 5 minutes before starting the engine. Be sure to reinstall the dipstick. Discarded Parts, Oils and Other Liquids When changing oils, filters, engine coolant or other liquids, be sure to This Engine Oil Viscosity Grade filters. The engine oil level must be have a container ready in advance Chart shows general information. checked and the oil should be for their disposal. For this vehicle, oil with *W-40 changed regularly according to the Use methods conforming to legal viscosity is recommended. Maintenance Schedule. requirements for discarding or Use the indicated oil quantities only disposing of parts, oils, filters or Changing the Engine Oil and as guidelines when changing the engine coolant after change or Oil Filter engine oil. After changing the oil, replacement. Engine oil and the oil filter are make sure the oil is at the required Do not dispose of used engine oil, important factors in engine level. See Capacities and 0 fuel or any other oil in a careless performance and lifespan. Be sure Specifications 357. manner such as pouring it on the to use only the specified oil and oil ground, into sewers, or into streams Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 251 or bodies of water. Instead, recycle Too much or too little transmission Position of the Dipstick it by taking it to a used oil collection oil could damage your transmission. facility which may be found in your Too much could cause your community. transmission to overheat and fluid to spill out from the breather hose. Be Automatic Transmission sure to get an accurate reading if Fluid you check your transmission fluid. When cleaning around the dipstick { Warning and guide tube, make sure that you thoroughly wipe away all of the dirt Overfilling of the automatic and dust etc. Failure to do so may transmission can cause the fluid cause a fault in the transmission. to be "PURGED" out of the Do not let coolants (ethylene glycol breather hose onto the hot engine type), water based substances, For the single cab vehicle, the parts and can cause a fire. or other fluids etc., mix with the dipstick is located to the left side of fluid. Otherwise, degraded You and others could be seriously the automatic transmission at the performance and faulty operation of injured. rear of the engine. Tilt the cab up to the system will result. inspect it. Both quality and quantity of fluid are Checking the Automatic important factors that have a Transmission Oil level significant influence on the This operation could be difficult and performance and durability of the you may choose to have this done automatic transmission. Be sure to at your dealer. use only the dealer recommended fluid for replenishment, and observe If you choose to do it yourself, then the specified fluid level. be sure to follow all the instructions below or you could get a false reading on the dipstick. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

252 Vehicle Care automatic transmission fluid should reach a temperature of approximately 70 - 80 °C (158 - 176 °F). During the winter when temperatures are low, adjust the amount of driving time according to the actual conditions. 2. Park the vehicle on level ground, and firmly apply the parking brake. 3. With the engine idling, move For the crew cab vehicle, the Transmission Dipstick the selector lever from the P dipstick is located beneath the “ ” position to the 1 position 5. Reinsert the dipstick into rear-of-engine inspection panel. “ ” while pressing the brake pedal, position, pull out the dipstick After unlatching the A/T fluid and then return the lever from slowly, and check whether the inspection cover, the dipstick will be the 1 position to the P fluid level is within the H visible. “ ” “ ” “ ” position. marked range. Always check the fluid level at least twice. Inspection 4. With the engine still idling, pull Consistently is important in Wait at least 30 minutes before out the dipstick and wipe it with maintaining accuracy. checking the transmission fluid if a clean cloth. If inconsistent readings persist, you have been driving at high speed check the transmission for a long period of time, in city/ breather to ensure that it is heavy traffic or while pulling a trailer. clean and free of debris. 1. Start the engine, and drive the . Dipstick C (COLD) vehicle for approximately — Transmission fluid 10 minutes to warm up the temperature Approx. 20 - engine. During 10 minutes, the 30 °C (68 - 86 °F). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 253 . Dipstick H (HOT) — Be sure to use a genuine air cleaner Transmission fluid { Warning element. If a different air cleaner temperature Approx. 70 - element is used, it may cause the 80 °C (158 - 176 °F). Be extremely careful not to burn sensor to output a wrong signal. yourself when checking the oil 0 . The “C (COLD)” range on level if the engine temperature is See Maintenance Schedule 327. the dipstick is a guide used high. Protect yourself with Air Cleaner Indicator Light by your dealer for gloves etc. specialized equipment used When the air cleaner indicator light to replace or service the You and others could be seriously comes on, check the air cleaner automatic transmission injured. element. If the air cleaner element is fluid. When performing your clogged, replace the air cleaner own inspections, always Discarded parts, oil, grease and element. use the H (HOT) range “ ” fluids could have an adverse effect See Vehicle Messages 0 86. after warming up the on the environment. It is difficult to See Maintenance Schedule 0 327. vehicle. dispose of these, so have your The fluid must be hot to dealer handle all checks and ensure an accurate check. replacements. Engine Coolant The fluid level rises as Protection of Engine Against temperature increases. Engine Air Cleaner/Filter Overcooling 6. If the fluid level is too low, add Air Cleaner Overcooling of the engine not only the specified fluid through the accelerates wear of the vital engine dipstick guide tube. Also, check Using a clogged air cleaner element parts but also hurts fuel economy. whether there are no fluid not only reduces engine output but leaks. also causes increased fuel consumption and an increased DPF 7. Insert the dipstick securely into regeneration frequency. position. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

254 Vehicle Care Engine Coolant in Cold overflows into the reserve tank. Weather When the system cools, engine { Warning coolant is drawn back into the To prevent the engine damage due radiator. Check, replenish or change the to freezing of the engine coolant, engine coolant only after the mix the coolant and water at the The engine cooling system has engine has sufficiently ratio of 50/50. been filled at the factory with a cooled down. quality engine coolant. It is Replace rubber hoses whenever important to use proper engine Do not loosen or remove the cap they crack or are damaged; even coolant to prevent damage to of the radiator or engine coolant minor cracks allow engine coolant engine cooling system components. reserve tank cap when the engine solution to leak. The engine cooling system is coolant is still hot. Hot vapor or designed to use engine coolant boiling water may burst out and { Warning rather than plain water. See cause a burn. Recommended Fluids and When removing the radiator cap If your engine cooling system Lubricants 0 349. overheats, see Engine or engine coolant reserve tank Overheating 0 259. Continued See the Maintenance Schedule to cap, use a thick cloth to cover the find out when the engine coolant operation of the engine even for a cap and turn it slowly. must be replaced. Note that short time may result in a fire and changing the engine coolant is Engine coolant is toxic and must the possibility of personal injury needed to replenish the rust not be ingested. If the engine and/or severe vehicle damage. inhibitors to make certain that all coolant is mistakenly ingested, You and others could be seriously parts of the engine cooling system seek prompt medical attention. injured. work well. If the engine coolant gets in your eyes, rinse your eyes immediately Your vehicle has an engine coolant with a large amount of water for recovery system, expansion bottle 15 minutes or longer. Also, if your and/or an engine coolant reserve (Continued) tank system. Engine coolant in the system expands with heat and Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 255 corrosion, use a mixture of the (262 °F). Periodic replacement Warning (Continued) recommended type antifreeze and of engine coolant is needed to water. If the engine of the vehicle is replenish the anticorrosion eyes are still irritated or otherwise at −30 °C (−22 °F) or above, the additives that wear out with use. feel abnormal, seek immediate coolant concentration should be Engine coolant that has become medical attention. 50%. Direct use of “50/50 dark in color shows that it needs If the engine coolant gets on your Pre-diluted” product which is already to be changed. skin, rinse it off using a soap with diluted to 50% concentration is . Use only the recommended a large amount of water. Also, recommended. If the outside coolant. See Recommended if abnormality is seen, seek temperature engine or vehicle is Fluids and Lubricants 0 349. medical attention. used at −30 °C (−22 °F) or below, coolant concentration of 55% is . Do not use methanol-base Engine coolant is flammable, and recommended. antifreeze, alcohol or plain water therefore, it must be kept away alone in your vehicle at any time. It is the owner s responsibility to: from flames and other heat ’ They will boil at a lower point sources. Engine coolant also . Maintain the engine cooling than that at which the engine could ignite if it comes in contact system freeze protection at or coolant temperature gauge will with a hot surface, such as the above −30 °C (−22 °F) (at or warn of overheating, and they do exhaust manifold. Exercise below −30 °C (−22 °F) in colder not provide proper protection caution to prevent this from climates to ensure protection against corrosion. happening. against corrosion and loss of engine coolant from boiling. Engine Coolant Quantity You and others could be seriously A 50/50 (55/45 for colder For the quantity of engine coolant, injured. climates) mixture of the see Capacities and Specifications recommended type antifreeze 0 357. After changing the engine Preparing Engine Coolant and water will provide freeze coolant, check that the engine protection to at or above −30 °C coolant is up to the specified level. To prevent engine damage due to (−22 °F), (at or below −30 °C freezing of the engine coolant and (−22 °F) in colder climates) and to protect the cooling system from boil protection to 128 °C Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

256 Vehicle Care Using coolant at any coolant { Warning concentration other than that specified may reduce anti-freezing For storage, close the cap of performance, and engine coolant coolant container securely and may freeze. keep it in a place inaccessible to children. If the engine coolant decreases rapidly, stop the vehicle in a safe You and others could be seriously place and contact your dealer for injured. advice and repair. Checking the Engine Coolant Using any coolant other than that Level recommended by your dealer could cause damage to the engine, For the crew cab model, the engine radiator or heater core. In particular, coolant reserve tank is under the use of coolants containing borate access panel beneath the left rear salts or silicates may result in seat. See Engine Cover 0 245. engine or radiator corrosion, When the engine has cooled down, causing engine coolant leaks and make sure that the fluid level in the other problems. engine coolant reserve tank is no To dilute the coolant, use distilled lower than the “MIN” line. In water or deionized water. addition, carefully remove the radiator cap and check to see if it is Do not use the coolant at any damaged. Check that the engine coolant concentration other than coolant is full to the filler neck. that specified. If the coolant Check the engine coolant level only concentration is 60% or higher, For the single cab model, the when it is cold. overheating is likely to occur, while engine coolant reserve tank is if it is 30% or lower, anti-corrosion located behind the front-right wheel. function is not provided sufficiently. See Cab Tilting 0 243. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 257 stains on the ground showing leaks where the vehicle is parked. Contact your dealer if you discover leaks. Using the vehicle when there are leaks can lead to engine seizure. Adding Engine Coolant

The radiator cap (1) opens and Crew Cab Model closes in double action. When When the engine coolant level in the removing the radiator cap, take engine coolant reserve tank is caution not to damage the cap and below the “MIN” line, open the the filler neck (2). reserve tank cap and fill to near the Turn the cap slowly to the left until it “MAX” line with engine coolant. reaches a “stop”. Do not press down Wash the reserve tank cap and filler while turning the cap. Single Cab Model neck with clean water. Tighten the cap securely after the engine Wait until any remaining pressure coolant has been replenished. (indicated by a hissing sound) is relieved, then press down on the cap and continue turning it to the left. Also, check to make sure there are no leaks from the radiator or radiator hose. Check for fluid or Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

258 Vehicle Care engine coolant to provide for Thermostat required cooling, freezing, and The engine coolant temperature is corrosion protection. controlled by thermostat(s). The 3. Run the engine until the engine thermostats stop engine coolant coolant temperature rises to flow through the radiator until a normal level, and idle the preset temperature is reached. The engine for 10 minutes. thermostats are installed in the 4. Install the radiator cap. engine coolant outlet on the engine block. The same thermostats are Check, replenish or change the used in both winter and summer. engine coolant only after the engine When a replacement is needed, has sufficiently cooled down. genuine GM parts are 1. When the engine is cool, When the engine is still hot, take recommended. remove the radiator cap (1). care to prevent engine coolant from Radiator Pressure Cap contact with the exhaust manifold. . Turn the cap slowly to the The radiator cap, a 108 kPa (16 psi) left until it reaches a “stop”. Any such contact could result in exhaust manifold damage. pressure type, must be installed Do not press down while tightly, otherwise engine coolant turning the cap. If you use the proper quality engine may be lost and damage to the . Wait until any remaining coolant, there is no need to add engine may result from overheating. pressure (indicated by a extra inhibitors or additives which The radiator pressure cap should be hissing sound) is relieved, claim to improve the system. They checked periodically for proper then press down on the cap may be harmful to the proper operation. If a replacement is and continue turning it to operation of the system. required, a genuine GM part is the left. Do not overfill the engine coolant recommended. 2. Fill the radiator to the base of reserve tank. the filler neck (2) and install the If the level of engine coolant radiator cap. Add enough changes rapidly, have your vehicle inspected at your dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 259 Engine Overheating HEAT” message displayed. Take the If Steam Is Coming from the following corrective actions Engine Compartment When the Engine Overheats immediately. The engine cooling system may { Warning overheat if the engine coolant level { Warning is too low, if there is a sudden loss If the engine coolant temperature of engine coolant (such as radiator To help avoid being burned: gauge shows an overheat hose failure), or if other problems Do not tilt the cab or open the condition or you have other occur. It may also temporarily engine access cover if you see or reasons to suspect the engine overheat during severe operating hear steam or engine coolant may be overheating, continued conditions such as: escaping from the engine operation of the engine (other than as described here) even for . Climbing a long hill on a hot day. compartment. Wait until no steam or engine coolant can be seen or a short period of time may cause . Stopping after high-speed a fire and the result in personal driving. heard before tilting the cab or opening the engine cover. injury and severe vehicle . Idling for long periods in traffic. damage. Take immediate action Do not remove the radiator cap or as outlined. If engine power drops and the engine coolant reserve tank cap if needle on the engine coolant the engine coolant in the tank is You and others could be seriously temperature gauge goes up above boiling. Also do not remove the injured. the upper limit of the safety zone radiator cap while the engine and and enters the "H" zone, the engine radiator are still hot. Scalding fluid is overheating. The engine overheat If you see or hear escaping steam warning light will come on and the and steam can be blown out or have any other reason to suspect warning buzzer will sound. Either under pressure if either cap is there is a serious overheat steam or boiling engine coolant will taken off too soon. condition, stop and park the vehicle squirt out of the radiator. The as soon as it is safe to do so, turn You and others could be seriously on the hazard warning flasher and vehicle will also have an “OVER injured. then turn off the engine immediately and safely exit the vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

260 Vehicle Care If Steam Is Not Coming from the If the engine coolant temperature When the cooling fan for the Engine Compartment gauge shows an overheat condition, radiator is not turning, turn off or you have reason to suspect the the engine immediately. engine may be overheating, take the following steps: { Warning 1. Operate the hazard warning flasher and pull the vehicle Even when the engine has been immediately over to a safe stopped, the engine coolant in the place that does not impede radiator remains under pressure. traffic and park it. Immediately removing the radiator cap could cause steam or hot 2. Idle the engine and wait until water to blow out, and you could the engine coolant temperature be scalded as a result. The drops to safety zone. If your air conditioner (if equipped) is on, engine coolant in the reserve tank turn it off. And turn on the may also be hot. Immediately heater to help the engine removing the cap could cause hot expel heat. water to blow out, and possibly scald you. Perform inspection, 3. When the needle of the engine refilling, and replacement of coolant temperature gauge coolant only when its temperature returns to the middle of the has cooled. safety zone, stop the engine. If the needle of engine coolant When removing the radiator cap temperature gauge does not and reserve tank cap, use a thick drop inside into the safety cloth to cover the cap and turn it zone, turn the engine off and little by little. have your vehicle serviced at the nearest dealer. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 261 4. If no steam or engine coolant started. Make sure the fan 5. Inspect to see if there is any can be seen or heard from the blade and pulleys are not dirt, etc. attached to the front engine compartment: broken. surface of the radiator. Also, . Tilt the cab or open the . Check the radiator hoses inspect to see if there is engine access cover. and connections, heater anything blocking the core. hoses and connections, If there is anything attached, ‐ If the engine coolant is clean and remove it. boiling, wait until it stops radiator, water pump, EGR before proceeding. cooler, and SCR system 6. After the inspection, regardless and hoses for leakage. of the vehicle condition, please ‐ Look at the see-through contact the nearest dealer. reserve tank. The If you do not find a leak or engine coolant level other problem, carefully add Once the engine coolant should be between the engine coolant to the temperature gauge no longer "MAX" and "MIN" lines reserve tank. signals an overheat condition, you on the reserve tank. If the engine coolant level in can resume driving at a reduced the reserve tank is at the speed. Return to normal driving ‐ If necessary, pour after about 10 minutes if the gauge engine coolant (See correct level but there is still an indication on the pointer does not again show an Engine Coolant 0 253 overheat condition. for the proper coolant instrument panel of an and water mixture) into overheat condition: When tap water only has been used the reserve tank only, You must let the engine for engine coolant in an emergency, not directly into the cool first. You may then add change the engine coolant as soon radiator. Also, do not engine coolant directly to as possible. check engine coolant the radiator. See “Adding Engine damage may be caused if level at the radiator. Engine Coolant” under an overheating engine is suddenly 0 . Make sure the fan belts are Engine Coolant 253. refilled with water. Instead, refill not broken, or off the slowly. pulleys, and that the fan turns when the engine is Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

262 Vehicle Care Power Steering Fluid Checking the Power Steering Fluid Level { Warning The power steering fluid level must be checked and it must be changed Before adding fluid, clean the according to the Maintenance area around the cap and pour Schedule. See Maintenance fluid from a clean jug or filler. Schedule 0 327. Foreign matter getting in the tank When replenishing power steering may cause power steering system fluid or flushing the power steering failure. system, always use ATF Do not mix the recommended ® (Dexron -VI). Failure to use the power steering fluid with fluids of proper fluid may damage the power other brands. Due to chemical steering system seals and hoses, reactions, any mixture of leading to fluid leakage. differently branded fluids may cause failure of the system. The fluid level is correct if it is You and others could be seriously between the “MAX” and “MIN” lines injured. on the power steering fluid tank. If the level is lower that the “MIN” line, add fluid up to the “MAX” line. Washer Fluid The reserve tank is located at the Windshield Washer Fluid rear of the engine compartment on the right. When you have finished The windshield washer is equipped checking the fluid level, securely on the windshield wiper arm. reinstall the cap and cover. Check the level of fluid in the windshield washer fluid tank. In addition, spray windshield washer fluid and operate the windshield wipers to check for any areas not Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 263 properly wiped. At this time, also Refilling Windshield Washer Follow the instructions provided with check the spraying condition of the Fluid the windshield washer fluid windshield washer. regarding the ratio for mixing with Inspect the washer fluid level tap water. regularly, especially during bad Poor quality products, engine weather conditions. coolant, and soapy water must not Use a high quality premixed solvent be used. Failure to observe this available at most dealers or service precaution can result in nozzle stations. blockage or damage to painted surfaces. Avoid hard water when mixing windshield washer solvents. Hard The washer should never be used water contaminants may plug while the tank is empty. Operating orifices in the washer system and the washer with the tank empty can reduce performance. result in motor damage. Do not use radiator antifreeze in the 1. The windshield washer fluid Brakes windshield washer; it could cause tank (1) is located under the cab paint damage. instrument panel on the For the most effective braking and passenger side. for maximum life from brake system In cold weather, warm the components, follow these windshield with the defrosters 2. Open the cap (2) and fill the suggestions: before using the washer, to help tank with windshield washer prevent icing that may block the fluid. . Keep any obstructions from driver's vision. interfering with brake pedal Upon factory shipment, new travel. vehicles contain only tap water in the washer fluid tank. Adjust the . Keep tires properly inflated. concentration of the fluid to suit your Improperly inflated tires can own usage. reduce the efficiency of the brakes. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

264 Vehicle Care Follow the recommendations for 2. Check for the noisy sound of utilizes hydraulic pressure from the brake checks in the Maintenance the electric vacuum pump HBB pump integral with the power Schedule. inside the instrument panel at steering pump. GM replacement brake lining the same time as vacuum If the brake booster warning light material is recommended for this warning buzzer sound, and comes on or a warning buzzer vehicle to maintain the balance check that the brake low continues to sound, there may be a between front and rear brake vacuum warning light problem with the HBB. comes on. performance. GM replacement If this warning light comes on while brake parts have been carefully 3. Then, start the engine. The driving, immediately stop your selected to provide the proper brake main vacuum pump driven by vehicle at a safe place well clear of balance for purposes of both the engine will start running. traffic and promptly contact the stopping distance and controllability If the electric vacuum pump nearest dealer for inspection. over the full range of operating operation (noisy sound) and conditions. Installation of front or the vacuum warning buzzer Hydraulic brake booster (HBB) rear brake lining material with stop, and the brake low characteristics performance different from that of vacuum warning light goes off In the 5500HD, 5500XD models, an the replacement parts thereafter, the operation is unusual sound from under the recommended for this vehicle can normal. instrument panel may be heard from change the intended brake balance 4. If you cannot hear the noisy the hydraulic system while brakes of this vehicle. sound or the noisy sound stays are used. It does not mean trouble. Checking the Brake Electric on all the time, have the It is not a sign of malfunction. Vacuum Pump (4500HD/ vehicle inspected by the If you pump the brakes with the 4500XD Series) nearest dealer immediately. engine off, a squeaking sound can be heard. This comes from the 1. Turn the engine control switch Hydraulic Brake Booster (HBB) auxiliary accumulator. It is not a to the "ON" position (do not The 5500HD, 5500XD models are malfunction. With the engine start the engine), and press the equipped with an HBB system. HBB running, a similar sound can be brake pedal several times. is a brake booster device that heard during sudden braking. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 265 Another characteristic of the HBB Vacuum or hydraulic power system is that the brake pedal may assisted brakes Caution (Continued) be pressed easily to the floor with If the engine stops, do not pump the hosing. Eventual leakage of HBB the vehicle at a stop. This is not a brakes. The system is designed to sign of malfunction. oil, sudden increase in brake stop the vehicle with reserve power pedal resistance and fire could When the engine is running, the assist if the brake pedal is held unexpectedly result in a crash. system automatically charges the down. This reserve is greatly accumulator whenever pressure has reduced each time you apply and been reduced after braking. Auto release the brakes. If, when you Hydraulic Brake Booster (HBB) charge may be activated without turn the steering wheel during Fluid (5500HD/5500XD Series) braking, depending on temperature braking, the vehicle does not turn, The HBB system has been changes in the accumulator. During release some pressure from the designed to use Dexron VI ATF auto charge, a hissing and clicking brake pedal. fluid. If any other fluid is used with sound can be heard. This is not a this system, rubber components malfunction. In a Vehicle Equipped with an HBB, Do Not Keep the Brake may be damaged, oil may leak and With the engine running, a booming Pedal Pressed for an Extended the system may malfunction. It is sound can be heard during hard Period important to remember that the fluid braking. This comes from the used in the hydro-booster is completely different in brake-fluid pump. It is not a Caution malfunction. characteristics from the brake fluid Failure to follow the above used in the master and wheel Applying continuous hard braking cylinders. for a long time will lead to instruction will cause the oil inside considerable temperature rise in the the HBB oil pump to get very hot. If hydro-booster fluid and brake fluid HBB pump. Such overworking of the This could damage the HBB tank from the master cylinder are brakes is best avoided. and deteriorate seals and also mistakenly mixed together and could cause damage to the HBB used, rubber components will oil pump, HBB unit and/or HBB deteriorate as a result of insufficient lubrication. Any resultant oil leakage (Continued) or system malfunction can in turn Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

266 Vehicle Care lead to dragging brakes or other This is of particular importance The hydro-booster fluid level is major brake problems. As such, when removing components such correct if it is between the "MAX" mixing of these two fluids can as the accumulator or pressure and "MIN" lines. If the level is too ultimately lead to vehicle fire or switch from the hydro-booster. low, add fluid up to the "MAX" line. other serious crashes. If these operations are attempted Be sure to use Dexron VI ATF fluid When the pump operates while the while the accumulator is still at a when adding fluid. The brake engine is running, the fluid in the high pressure, hydro-booster fluid booster reservoir is located behind hydro-booster will become hot. may spray out. the cab on the left side. During normal braking, the Checking the Hydro-booster Fluid Brake Pedal temperature in piping and within the Level hydro-booster can rise above 100 ° Stroke C (212 °F). For this reason, special care will be required when working with hydro-booster components. If the hydro-booster is to be removed from the vehicle, shut off the engine and then allow at least 30 minutes for it to cool down before beginning this operation. Even when the engine is stopped, the hydro-booster's accumulator will remain in a highly-pressurized condition for a significant period of time. Before removing the Check the hydro-booster fluid level hydro-booster or piping from the and change the fluid according to Shut off the engine and press the vehicle, stop the engine and press the Maintenance Schedule. brake pedal about 10 times strongly, the brake pedal at least 10 times in then check the brake pedal for free order to lower the accumulator play by lightly pushing it by hand pressure to atmospheric pressure. until you feel resistance. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 267

Free play (measured at the tip of floor (that is, the distance between ‐ Brake pad wear pedal) the brake pedal bracket (2) and the Brake pads are about to wear brake pedal arm). out. If this happens, have your 5 - 10 mm (0.20 - 0.39 in) Clearance between the brake vehicle inspected at the nearest (4500HD/4500XD) pedal and the brake pedal bracket dealer as soon as possible. 24 - 29 mm (0.95 - 1.14 in) with a pressure of 490 N (110 lbs) Adherence of sand, grit or mud (5500HD/5500XD) applied to the brake pedal ‐ If sand, grit or mud adheres to 35 mm (1.38 in) or more (4500HD/ the brakes, a screeching sound 4500XD) may be emitted upon contact with rotating components. If this Clearance between the brake happens, wash the vehicle to pedal and the brake pedal bracket remove all such adhering matter. with a pressure of 294 N (66 lbs) If cleaning alone does not applied to the brake pedal eliminate the squeaking sound, 35 mm (1.38 in) or more (4500HD/ have your vehicle inspected at 4500XD/5500HD/5500XD) the nearest dealer. Brake Hoses and Pipes If, after continued pressing of the brake pedal, the clearance slowly Inspection decreases or the pedal action feels With the steering wheel turned fully 1. Clearance from the floor. spongy, air may be trapped in the to the left, check the left front brake 2. Brake pedal bracket. brake hydraulic circuit. Have your hose and pipe visually and by vehicle inspected at the nearest Next, start the engine, and wait at touch, making sure that they are dealer as soon as possible. least 1 minute. Then press the free of scratches, cracks and brake pedal and measure the If your vehicle's brakes squeak bulging. Also make sure that the clearance (1) of the pedal from the during normal driving or braking, the hose and pipe do not interfere with cause may be one of the following. any chassis part or wheel, and that their joints are not leaking and are Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

268 Vehicle Care free of any type of damage. Check Remove the inspection cover (1) on the right front brake hose and pipe Caution the left- hand side of the instrument in the same way. The rear left and panel by turning it with your fingers. right brake hoses and pipes should The pad has an embedded wear Check that the fluid level in the also be checked in the same indicator. A squeaking noise from reservoir is between the "MAX" and manner. the indicator means that the pad "ADD" lines. is approaching the usable limit. Disc Brakes and Drum Brakes If the squeaking noise from the If the fluid surface cannot easily be seen, rock the vehicle gently. If the brake pads and shoe linings indicator can be heard, contact wear out beyond their usable limit, the nearest dealer for inspection Adding Brake Fluid or replacement. not only will the brake performance If the level of brake fluid has be impaired, but brake components dropped below the "ADD" line, could also fail. Brake Fluid remove the cap (2) and add fluid. Take care to avoid filling beyond the { Warning Checking the Brake Fluid "MAX" line. Level Do not drive with brake pads and Tighten the cap securely after the shoe linings worn out beyond the fluid has been added. limit. Excessively worn brake When adding brake fluid to the tank, pads and shoe linings may cause take care to prevent dirt and water breakdown of brake components from entering it. Any dirt or water in and poor braking performance. the system could cause the vehicle You and others could be seriously to lose braking functions. injured. Inspect and change brake fluid according to the Maintenance Schedule. Use the recommended brake fluid when adding brake fluid. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 269 Never mix the specified brake fluid Battery - North America with fluids of another brand. Danger (Continued) Working Near Battery Be careful not to spill brake fluid when working on or near the onto painted surfaces or to let it battery. Personal injury come in contact with skin. If fluid is (particularly to eyes) or property spilled onto a painted surface or damage may result from battery comes in contact with skin, wash explosion, battery fluid or away the fluid with water and electrical (short circuit) burns. You immediately wipe the area clean. and others could be seriously Brake fluid readily absorbs moisture. injured or killed. Therefore, it is necessary to close the brake fluid container tightly for storage. If the negative cable is disconnected from the negative terminal on the If the brake fluid level decreases battery within 3 minutes after turning rapidly, there may be a problem in the engine control switch to the the brake system or brake pads or The batteries are located on the "LOCK" position, the engine control shoe linings may have worn out. outboard side of the left frame rail, module may malfunction. Have your vehicle inspected by the behind the cab. The batteries are in Checking the Battery nearest dealer immediately. a carrier with the cover (2) retained by spring clips (1). Your new vehicle is equipped with DELKOR batteries. They need no { Danger periodic electrolyte level maintenance. Its top is permanently Follow the precautions listed in sealed (except for two small vent the jump starting Danger (see holes) and has no filler caps. You "When the Battery is Discharged") will never have to add water. (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

270 Vehicle Care Remember to check and recharge Fuel Filter the battery as necessary, as well as { Warning keep connection clean. Change the fuel filter in accordance WARNING: Battery posts, with the Maintenance Schedule or The hydrometer (green-eye test terminals, and related when the fuel filter indicator light indicator) in the top of each battery accessories contain lead and lead (amber) comes on. (if equipped) provides information compounds, chemicals known to for testing purposes only. Drain the water when the water the State of California to cause separator (fuel filter) warning light If the vehicle is not going to be cancer and birth defects or other comes on. (Drain the water from the driven for 30 days or longer, reproductive harm. Batteries also chassis-side fuel filter and disconnect the ground cable from contain other chemicals known to engine-side fuel filter.) the negative (–) terminal of the the State of California to cause Failure to replace the fuel filter when batteries to prevent discharge. cancer. WASH HANDS AFTER needed may lead to fuel system HANDLING. For more information For full power needs at replacement damage. Your authorized dealer can time, a battery with the same go to www.P65Warnings.ca.gov/ inspect your fuel filter and replace specifications, as shown on the passenger-vehicle. your fuel filter, if needed. original battery's label, is recommended. See California Proposition 65 Warning 0 240 and the back cover. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 271 Rear Axle (Gear Oil Viscosity Chart) Gear Oil Viscosity Chart Select appropriate gear oil in accordance with the table below. It is important to select the viscosity appropriate for the temperature at which your vehicle operates. Use the following table for making correct selections. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

272 Vehicle Care Rear Axle (Oil Level Checking the Oil Level 2. Check that the oil level (1) is 0 mm to 10 mm (0 to 0.4 in) Check) below the bottom edge of the Rear Axle Differential Gear Oil oil level plug hole (2). If the oil level is too low, add oil through The rear axle differential gear oil the oil level plug hole. level must be checked for its level and it must be changed according to 3. Fasten the oil level plug to the the Maintenance Schedule. specified torque. Plug tightening torque is 84 Nm Use the oil quantities indicated later (8.6 kgFm/62 lb ft). in this section only as guidelines when changing the rear axle Any dirt on the plug should be differential gear oil. wiped off before installing it. After changing the oil, ensure that it Noise Control System is at the correct level. 1. Remove the oil level plug. Drained oil must be disposed of in a Noise Emissions Warranty method conforming to the regulatory General Motors warrants to the first requirements in your state. person who purchases this vehicle for purposes other than resale and to each subsequent purchaser that this vehicle as manufactured by General Motors, was designed, built and equipped to conform at the time it left General Motors’s control with all applicable U.S. EPA Noise Control Regulations. This warranty covers this vehicle as designed, built and equipped by General Motors, and is not limited to any Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 273 particular part, component or TAMPERING WITH NOISE Insulation: system of the vehicle manufactured CONTROL SYSTEM Removal of the noise shields or any by General Motors. Defects in PROHIBITED underhood insulation. design, assembly or in any part, component or system of the vehicle Federal law prohibits the following Engine: acts or the causing thereof: as manufactured by General Removal or rendering the engine Motors, which, at the time it left 1. The removal or rendering speed governor, if equipped, General Motors’s control, caused inoperative by any person, inoperative so as to allow engine noise emissions to exceed Federal other than for purposes of speed to exceed manufacturer standards, are covered by this maintenance, repair, specifications. warranty for the life of the vehicle. or replacement, of any device Fan and Drive: The following information relates to or element of design compliance with federal noise incorporated into any new . Removal of the fan clutch, emission standards for vehicles with vehicle for the purpose of noise if equipped, or rendering the a Gross Vehicle Weight Rating control prior to its sale or clutch inoperative. (GVWR) of more than 4 536 kg delivery to the ultimate purchaser or while it is in . Removal of the fan shroud, (10,000 lb). The Maintenance if equipped. Schedule provides information on use; or maintaining the noise control system 2. The use of the vehicle after Air Intake: to minimize degradation of the noise such device or element of . Removal of the air cleaner emission control system during the design has been removed or silencer. life of the vehicle. The noise control rendered inoperative by any system warranty is given in the person. . Modification of the air cleaner. warranty manual. Among those acts presumed to Exhaust: These standards apply only to constitute tampering are the acts . Removal of the muffler and/or vehicles sold in the United States. listed below. resonator. . Removal of the exhaust pipes and exhaust pipe clamps. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

274 Vehicle Care Automatic Transmission 3. Remove the selector lever cover by removing the four Shift Lock Control screws and lifting it up. Function Check When the Selector Lever Cannot be Moved From the "P" Position Perform the following when the selector lever cannot be moved from the "P" position.

Caution 2. Remove the cup holder (1) by removing the three Torx® When the selector cannot be bolts (2). operated from the P position to any other position even after 4. Operate the selector lever (1) performing the operation below while pressing the release repeatedly, the shift lock system lever (2). may have a failure. Have the When installing the cover, perform vehicle inspected at your dealer. the removal procedure in reverse order. When performing the below operations, make sure the parking brake is securely engaged. 1. Securely pull the parking brake lever and stop the engine. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 275 Wiper Blade Replacement 1. Pull the wiper arm up to the Installation vertical position. Caution 2. While pressing the wiper-blade hook toward the arm, slide the Allowing the wiper arm to touch blade downward toward the the windshield when no wiper base of the arm. blade is installed could damage the windshield. Any damage that occurs would not be covered by the vehicle warranty. Do not allow the wiper arm to touch the windshield.

Removal 1. Insert the blade while holding it almost perpendicular to the arm.

3. With the blade and arm almost perpendicular, remove the blade from the arm. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

276 Vehicle Care Replacement of Wiper Rubber Installation Insert Removal

2. With the blade and arm oriented in the same direction, push up the blade until it locks 1. Insert a new wiper rubber into place on the arm. insert into the wiper blade. Whenever a wiper blade has been 1. Remove the wiper blade from attached, ensure that it is locked the wiper arm. into place. Failure to observe this precaution can result in the wiper 2. Pull the wiper rubber insert in blade becoming dislocated when the the direction indicated by the windshield wiper switch is arrow and extract it from the turned on. wiper blade. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 277 2. Continue pushing in the wiper Headlamp Aiming Bulb Replacement rubber insert until the wiper blade's hook engages with the hole in it, and then confirm that Caution the rubber insert is securely held in place. Do not replace incandescent bulbs with aftermarket LED 3. Attach the wiper blade to the replacement bulbs. This can wiper arm. cause damage to the vehicle electrical system.

Bulbs 1. Check each bulb for blowout. 2. If a bulb has blown out, replace For vertical aiming, turn the two it. Always place the engine screws indicated by arrows in the control switch in the “LOCK” diagram. position and place all the other 1. Remove the rubber beneath switches in the “OFF” position the headlight. before replacing the blown bulbs. 2. Two screws should be turned in the same direction at the 3. If you need assistance same time to adjust aiming. replacing any bulbs, contact your dealer. 3. When the headlamp aiming is out of position, contact your Turn Signals dealer. The flasher unit activates both the turn signal circuits and the hazard circuit. Should a lamp burn out, the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

278 Vehicle Care flasher unit will continue to operate. When one bulb of a pair of lamps, Check the turn signal lamps visually such as a headlamp blows out, the before the vehicle is used. other bulb is approaching the end of its useful life. We recommend that Bulb Wattage both be changed at the same time. { Warning For the lamps (lighting equipment) such as headlamps, inside of the Using bulbs with a wattage other lens can mist up momentarily when than that specified could cause driving in the rain or during the car the bulb or the wiring to become wash. Also, the temperature difference between inside and hot. This could result in the outside of the lamps can sometimes warping of the lens and case, and cause the water condensation it could also lead to the outbreak inside the lens. This is not abnormal of fire. because this is the same Bulbs are hot immediately after phenomenon as the windshield or they go out. When replacing the door glass fogs up when it rains. bulbs, avoid being burned by If the mist goes away minutes after making sure they are fully cooled. the lamp is turned on, things are normal. Never drive the vehicle with the bulbs not working. This could result in an accident. You and others could be seriously injured. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 279 Bulb Wattage Position Lights Bulb Wattage (12V) Qty. Front Headlight Highbeam/Lowbeam 60/55W 2 Front Turn Signal Lamp 27W (Amber) 2 Parking Lamp 5W 2 Cornering Lamp 27W 2 Side Turn Signal Lamp 5W (Amber) 2 Sidemarker Lamp 5W (Amber) 2 Rear Taillamp and Stoplamp 8/27W 2 Turn Signal Lamp 27W 2 Back-Up Lamp 27W 2 License Plate Lamp 7.5W 1 Roof Roofmarker Lamp 5W 5 (Identification/Clearance Lamp) Interior Dome Light 10W 1 Speedometer and Gauge Lights 3.4W 5 Warning/Indicator Lights LED 20

Contact your dealer when replacing lights that are not listed here. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

280 Vehicle Care Headlamps and Front Turn Signal Replacing the Headlamps When the bulb has blown out, replace it with a bulb of the specified wattage. Be careful not to excessively tighten the mounting screws when replacing the headlamp bulbs. Do not replace a bulb with other than the specified wattage. 1. Remove the front grille (3). 2. Remove the turn signal lamp. Proper aiming of the headlamps is Remove the screw (4) from the Open the front door. Use a important to ensure sufficient center of the grille. Push up on phillips head screwdriver to illumination of the highway without the tabs of the five clips (1) on remove the two screws blinding other motorists. When the upper side of the grille and between the door and the cab. replacing headlamp bulbs, have the pull the grille toward you to headlamp aim adjusted at your remove it. Loosen the nuts (2) dealer. for the turn signal light. When replacing a bulb, make sure the light switch is “OFF”. See Bulb Replacement 0 277. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 281 4. Disconnect the connector (1) for the turn signal lamp from the socket (2) and then remove the lamp.

3. Tilt the turn signal lamp unit 7. Disconnect the headlamp down toward the front of the connector (5) and the parking vehicle and remove it. lamp socket (3). Remove the headlamp assembly. When removing the headlamp 6. Disengage the rubber seals (2) connector, pull out the from the two projections (3) at connector while holding the the bottom of the headlamp. center portion of the rubber Remove the four bolts (1). boot. Otherwise, the headlamp bulb will be broken. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

282 Vehicle Care If the rubber boot is not firmly in place, water could get inside the headlamp and lead to a breakdown. Replacing Parking Lamps 1. Refer to “Replacing the Headlamps” and remove the headlamp assembly.

8. Remove the rubber boot (2). 9. Remove the bulb (1) from the Push the right side of the socket (2) and replace with a clip (1) that holds the bulb (3) new one. in place and slide it upwards to 10. After replacing the bulb, disengage the clip. reverse steps 1-8 to install. Do not touch the glass of the bulb with your hand. Soiling the glass will cause the bulb to blow out. When attaching the rubber boot, 2. Pull the bulb out from the press in both the outside and inside parking lamp socket and circumference of it. Make sure that replace with a new one. the rubber boot, the headlamp assembly, and the bulb are securely installed without any raised section. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 283 Replacing a Front Turn Signal Lamp

3. To install the lamps, perform 2. Disconnect the connector for the same sequence of the turn signal light and then operations in reverse, taking remove the socket. care to turn the connector Do not replace a bulb with other clockwise to lock it securely. than the specified wattage. This will If the socket is not locked securely, cause abnormal flashing, water could get inside the lamp and particularly for turn signal lamps. lead to a breakdown. When replacing a bulb, make sure the light switch is OFF. 1. While referring to “Replacing the Headlights”, tilt the turn signal lamp assembly down toward the front of the vehicle and remove it. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

284 Vehicle Care 3. Pull the bulb from the socket 2. Remove the bulb (3) from the and replace it with a new one. socket (4) and replace it with a 4. To install the lamps, perform new one. the same sequence of 3. To install the lights, follow the operations in reverse, taking removal procedure in reverse. care to turn the connector If the screwing procedure is clockwise to lock it securely. inadequate, water may infiltrate into If the socket is not locked securely, the lamp unit. water could get inside the light and lead to a breakdown. Sidemarker Lamps (Including Turn Signal Roofmarker Lamps and Cornering Lamps) 1. Open the front door, remove the rubber cap (1) in the lower Do not replace a bulb with other part of the door, and loosen than the specified wattage. This will the nut (2). cause abnormal flashing, particularly for turn signal lamps. When replacing a bulb, make sure the light switch is "OFF".

1. Loosen the screws (2) and remove the lens (1). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 285 2. Slide the cornering lamp (3) 4. Loosen the socket by turning it and the side turn signal lamp counterclockwise. forward relative to the vehicle. Disconnect the clip (1) on the lamp’s rear side from the door panel (2) and pull out the lamp. If you pull out the light rear section by too much when removing the clip on the rear side, the clip on the lamp front side may be damaged.

B. Insert the clip on the back of the rear part of the light into the door panel. 5. Pull the bulb out from the C. Push the front part of the socket and replace it with a light into the door panel, new one. and insert the clip on the 6. To install the lights, perform the back of the front part of the same sequence of operations light in the door panel. in reverse taking care of the following points: A. Turn the socket clockwise to lock securely. 3. When the clip (1) has been removed, pull the lamp out If the socket is not locked while sliding it out toward the securely, water could get rear of the vehicle. inside the light and lead to a breakdown. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

286 Vehicle Care Taillamps, Turn Signal, License Plate Lamp Stoplamps, and Back-Up Lamps

D. Open the front door, tighten the nut from the inside of the door, and install the rubber cap. 1. Bulb 2. Lens 3. Screw 1. Turn Signal Lamp 4. Cover 2. Taillamp/Stoplamp 3. Back-Up Lamp 1. Loosen the screws and remove 4. Lens the cover. 1. Loosen the screws and remove 2. Remove the lens. the lens. 3. Loosen the bulb by turning it 2. Loosen the bulb by turning it counterclockwise while counterclockwise while pressing on it. pressing on it. 4. To install the lights, follow the 3. To install the lights, follow the removal procedure in reverse. removal procedure in reverse. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 287 Interior Lamps Electrical System Fuses : In case of an electrical overload, the fuse will blow and stop the flow of current in the circuit Electrical System before electrical components Overload become damaged. Electrical System The cause of the circuit overload must be identified and corrected Following the after-delivery service, before the blown fuse is replaced, it is the owner's responsibility to or else the new fuse will also blow. check all wiring periodically for Since different circuits handle cracked, chafed or oil-soaked different amounts of current, fuses insulation and maintain it in a clean of various ampere ratings are used. and tight condition to ensure Be sure to replace a blown fuse with satisfactory operation of the a fuse of the correct rating. electrical system. 1. Remove the lens and pull out To know if a fuse is blown or not, the bulb. Replacing the Fuses and Relays remove the suspected fuse and look 2. To install the lights, follow the Your vehicle is equipped with fuses at the wire for a break. If the wire is removal procedure in reverse. and fusible links to protect your broken, replace the fuse with one of electrical wiring and equipment in equal amperage rating. case of electrical overload. The amperage rating of each fuse is molded in its head. When the lights do not come on or flash, or the equipment in the Fuses are installed in the fuse electrical system does not operate, panel. check to see if a fuse has blown. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

288 Vehicle Care The Location of Fuses and Relays Replacing Fuses 1. Before replacing fuses, firmly apply the parking brake, move the selector lever to the P (Park) position, and turn the engine control switch to the LOCK position. 2. The fuse puller is stored in the fuse box inside the cab. Place the fuse puller on the fuse and pull it out. The fuses (3) and relays (2) are located in the lower part of the instrument panel in the center and in the left rear of the cab. The cover (1) must be opened in order to carry out inspection and replacement. In addition, the cover (1) of the relay box at the left rear of the cab must also be opened at this time. If you should spill water or a beverage on the cover, wipe it off before opening the cover. 3. If the fuse appears as The area around the cover may get shown (2), the fuse is blown. warm when the vehicle is being Replace with a spare fuse (1). driven, but this is not abnormal. Spare fuses are stored in the fuse box inside the cab. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 289 Replacing Relays { Warning Before replacing the relays, contact Always use fuses specified for the the nearest dealer. vehicle. Using fuses with a rating The vehicle may not be equipped other than that specified, or using with all of the fuses, relays, and wire or tin foil, etc., could result in features shown. fire or damage. It is not necessary to open or close If the new fuses blow right away the cover unless trouble is found. and the cause is unknown, The relay box structure makes it contact your dealer. difficult for water to enter. If you Do not inspect or replace fuses should spill water or a beverage of when the starter switch is in the the cover, however, wipe it off ON position. Doing so may lead before opening the cover. to an accident. The area around the cover will get When inspecting fuses, be sure to warm when the vehicle is being park the vehicle on flat, level driven, but this is not abnormal. ground and apply chocks to the wheels. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

290 Vehicle Care

Fuse and Relay Location – Cab Interior Fuse locations: No. Description Rating 1 RR P / 25A WINDOW 2 – – 3 ROOM LAMP, 10A AUDIO 4 DOOR LOCK 15A 5 TRAILER 15A BRAKE 6 P/ WINDOW 25A 7 ABS 10A 8 WIPER 25A 9 H / LAMP 10A LO (LH) 10 LAMPS (BATT) 10A 11 H / LAMP 10A LO (RH) 12 BRAKE LAMPS 10A 13 STARTER 10A 14 H / LAMP 10A HI (LH) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 291

No. Description Rating No. Description Rating 15 H / LAMP 10A 25 HORN 15A HI (RH) 26 TURN, HAZARD 15A 16 MIRROR 15A 27 TAIL LAMPS 10A HEATER 28 17 IGNITION 2 10A 18 IGNITION 1 10A ILLUMINATIONS 10A 29 19 –– CORNERING LAMPS 10A 30 AIR CONDITIONER 10A 31 –– 32 –– 20 ECM 10A 33 –– 34 –– D-1 CIGAR 20A 21 METER 10A D-2 ACCESSORIES SOCKET 15A D-3 POWER SOURCE 20A D-4 22 ECU (BATT) 10A –– 23 MIRROR 10A 24 AUDIO, ACC 15A Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

292 Vehicle Care Relay locations: No. Description 1 STOP LAMP 2 DAYTIME RUNNING LAMP 3 KEY ON 4 TCM 5 PARKING/NEUTRAL 6 WIPER MAIN 7 HORN 8 WIPER HI LO 9 TRAILER BRAKE 10 POWER WINDOW 11 – 12 POWER WINDOW 13 HEAD LAMP LO 14 VACUUM PUMP 15 HEAD LAMP HI Relay Location 16 TAIL LAMP 17 CIGAR LIGHTER 18 CORNERING LAMP Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 293

No. Description Fuse and Relay Location – Cab Exterior 19 POWER ACC 20 BLOWER MOTOR

Fuse and Relay Location

Fuse locations (2): No. Description Rating No. Description Rating 5 PM SENSOR 15A 1 MARKER LIGHT 20A 6 RR DOME 15A 2 TAIL MAIN 20A LIGHT 3 ECM MAIN 15A 7 CONDENSER 20A 4 SCR 20A FAN Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

294 Vehicle Care

No. Description Rating When Slow-blow Fuses Blow Out Inspection 8 A/C 10A

Relay locations (1): No. Description 1 STARTER 2 ECM MAIN 3 NOX & DEF SENSOR 4 A/C COMPRESSOR 5 CONDENSER FAN 6 RR DOME LIGHT Slow-blow fuses protect the When the headlights and other 7 SCR HEATER electrical circuits, and they are devices in the electrical system do VALVE installed so that they can be quickly not work, but there is no problem replaced if there is a malfunction. with the fuses, check the 8 MARKER LIGHT If an overload exists in the circuit slow-blow fuse. 9 – from the battery, the slow-blow fuse The slow-blow fuse is blown if it 10 – will blow out before the wiring looks like the illustration. harness is damaged to protect the Immediately contact the nearest 11 FUEL HEATER electrical circuitry. dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 295 It is not necessary to open or close Wheels and Tires { Warning the cover unless trouble is found. The operating load and cold inflation The relay box structure makes it Always use fuses specified by the pressure on the rim and wheel must difficult for water to enter. If you dealer when replacing the not exceed the rim and wheel should spill water or a beverage of slow-blow fuse. Using fuses with manufacturer's recommendations the cover, however, wipe it off a rating other than that specified, even though the tire may be before opening the cover. or using wire or tin foil, etc., could approved for a higher load or result in fire or damage. The area around the cover will get inflation. Rim and wheel may be warm when the vehicle is being If the new fuses blow right away identified (stamped) with maximum driven, but this is not abnormal. and the cause is unknown, load and maximum cold inflation rating. For rims and wheels not so contact your dealer. identified or for service conditions Do not inspect or replace fuses exceeding the rate capacities, when the starter switch is in the consult the rim and wheel ON position. Doing so may lead manufacturer to determine rim and to an accident. wheel capacities for the intended service. The factory-installed tires When inspecting fuses, be sure to on this vehicle were selected to park the vehicle on flat, level provide the best all-around tire ground and apply chocks to the performance for normal operation. wheels. When inflated, as shown on the vehicle, they have the load carrying capacity to operate satisfactorily at all loads up to and including the full rated load specified for the vehicle. For more information concerning the differences in capacities of tires and Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

296 Vehicle Care rims, refer to the “Tire and Rim See “Tire Load and Inflation Table” Be sure to install the tire inflation Association Inc. Yearbook”, or your under Tire Pressure 0 307. valve caps to prevent dirt and tire dealer. In no case should the front or rear moisture from getting into the valve core, which could cause air leakage. Tire Inflation tire load exceed the maximum recommended gross axle weight An underinflated tire in a dual wheel rating (front GAWR or rear GAWR). assembly is harder to notice than { Warning one in a single wheel assembly. The The efficiency of the vehicle will be properly inflated dual tire carries its To reduce the risk of loss of upset if air pressure in the tires are own load plus that of the vehicle control and personal not equal. Balanced inflation results underinflated tire. Both tires can injury: when the tires on the same axle overheat, which may result in Tires must be properly inflated, carry the same air pressure. property damage and/or personal and your vehicle must not be A difference in pressure between injury (see previous WARNING). overloaded (see the information the front and rear tires may be Tires Used or Stored for a Long on Information on Loading the permissible within certain limitations, Period of Time Vehicle 0 58 and "Tire Load and however, there should not be a Tires are a rubber product and Inflation Table" under Tire difference in pressures between the 0 right and left tires on the same axle. degrade over time, even if they are Pressure 307). not being used. If any of your tires is Be sure to keep tires properly Always use a truck tire pressure 5 to 7 years old or more, please inflated. A tire that is run while gauge (a pocket-type gauge is not have them inspected for safe seriously underinflated may advised) when checking inflation driving. For further information, pressures. Visual inspection of tires overheat to the point where the please check with the tire for inflation pressures is not enough, tire may lose air suddenly and/or manufacturer. especially in the case of radial tires. catch fire, possibly resulting in Underinflated radial tires may look Dual Tire Operation personal injury and/or property similar to correctly inflated radial damage. The outer tire of a pair on dual tires. If the inflation pressure on a wheel installations generally wears tire is found to be low frequently, faster than the inner tire. If this have your dealer correct the cause. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 297 occurs, reverse the position of the when needed. (See the To reduce the chance of traction tires to equalize wear and get better Maintenance Schedule for more loss, follow these tips: tire life. information.) Improper alignment will . Slow down during rainstorms or In addition, when trucks are driven not cause the vehicle to vibrate; when roads are slushy. continuously on high-crown roads, however, improper toe-in alignment will cause front tires to roll at an . Slow down if the road has an increase in air pressure of standing water or puddles. 35 kPa (5 psi) in the outer tire of a angle that will result in faster tire dual tire operation will prolong outer wear. Incorrect caster or camber . Replace tires when front tread tire life. Be sure not to exceed the alignment will cause your front tires depth is 3.2 mm (4/32 in.) and inflation pressure limits shown on to wear unevenly, and may cause rear tread depth is 1.6 mm the vehicle to "pull" to the left or the “VIN, Weight Rating, and (2/32 in.). right. Greenhouse Gas (GHG) Emissions . Keep tires properly inflated. Plate.” See Vehicle Identification Tire Traction Number (VIN) 0 353. Tire Replacement A decrease in driving, cornering and Recommendations Wheel and Tire Balancing braking traction occurs when water, snow, ice, gravel or other material is Proper tire balancing provides the { Warning best riding comfort and helps to on the road surface. Driving reduce tire tread wear. practices and vehicle speed should Do not mix different construction Out-of-balance tires can cause be adjusted to the road conditions. types of tires on your vehicle such When driving on wet or slushy annoying vehicle vibration and as radial, bias and bias-belted roads, it is possible for a wedge of uneven tire wear, such as cupping tires except in emergencies, water to build up between the tire and flat spots. See your authorized because vehicle handling could dealer for wheel balancing. and road surface. This is known as hydroplaning, and may cause partial be affected and may result in loss Front End Alignment or complete loss of traction, vehicle of vehicle control, or personal injury or death. Proper front end alignment improves control and stopping ability; this tire tread mileage. Your vehicle's condition is also more likely with (Continued) front end suspension parts should worn tires. be inspected often and aligned Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

298 Vehicle Care Use of any other size or type tire Warning (Continued) may affect load carrying capacity, ride, handling, speedometer/ Consult your dealer before odometer calibration, vehicle ground replacing wheels. Never use clearance and tire clearance to the wheels that are not designed for chassis. If replacing only a single the vehicle. Doing so would tire, it should be put on the same impede safe vehicle operation. axle with other tires of equal diameter. You should replace your tires when: When replacing or rotating tires, all . Your tires are worn to a point tires on an axle should be of the where 3.2 mm (4/32 in.) (front) same tread design and should have and 1.6 mm (2/32 in.) (rear) or the same outside diameter within the cord or fabric is exposed. certain limitations, particularly on LSD models. Consult your . Your tire tread or sidewall is authorized dealer or tire dealer. cracked, cut or snagged deeply enough to expose the core, fabric or steel components. . Your tire has a hump, bulge or split. . Your tire sustains a puncture, cut or other damage that cannot be correctly repaired because of the size or location of the damage. When replacing tires, you should use the same size, load range and construction type (bias or radial) as the original tires on your vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 299 Recommended replacement tire for Greenhouse Gas (GHG) emissions Tire size Tire maker Tire name Rolling resistance BRIDGESTONE CORPORATION Duravis R250 LRRA LT215/85R16E THE YOKOHAMA RUBBER CO., LTD. TY213A MC2 LRRA BRIDGESTONE CORPORATION M895Z LRRA 225/70R19.5F THE YOKOHAMA RUBBER CO., LTD. TY287 MC2 LRRA

If the original equipment tires are Wheel Replacement width, offset and mounting types to low rolling tires, it is recommended Recommendations those originally installed in your to use the LRRA tires shown in the Wheels must be replaced if they vehicle. above table. become damaged (for example: A wheel of the wrong size or type Refer to the emission control bent, heavily rusted, leak air) or if may adversely affect wheel and identifiers on Greenhouse Gas wheel nuts often become loose. Do bearing life, brake cooling, (GHG) emission plate for your not use bent wheels that have been speedometer/odometer calibration, original equipment tires. Also, straightened and do not use inner stopping ability, headlight aim, please refer to “VIN, Weight Rating, tubes in leaking wheels which are bumper height, vehicle ground and Greenhouse Gas (GHG) designed for tubeless tires. Such clearance and tire or tire chain Emissions Plate” for the location of wheels may have structural damage clearance on the body and chassis. the Greenhouse Gas (GHG) and could fail without warning. Replacement with "used" wheels is emission plate. See Vehicle not advised. They may have been 0 When replacing wheels for any Identification Number (VIN) 353. reason, the new wheels should be subjected to harsh treatment or very equal in load capacity, diameter, high mileage and could fail without warning. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

300 Vehicle Care Checking Tires As the tire air pressure varies { Warning Air Pressure depending on the vehicle model and tire size, refer to the “VIN, Weight Consult your dealer before Rating, and Greenhouse Gas replacing wheels. Never use (GHG) Emissions Plate” on the wheels that are not designed for driver's door opening frame or the the vehicle. Doing so would tire air pressure information on the impede safe vehicle operation. following table.

The use of wheels and/or tires with higher load carrying limits than originally equipped on your vehicle does not in itself increase the GAWR or the GVWR of the vehicle. Replacement wheels can be obtained from the authorized dealer Too low or too high a tire air or tire dealer. pressure not only affects the ride or causes damage to the cargo but also causes abnormal heat buildup, premature wear, a tire puncture, or may even cause the tire to burst. Use an appropriate tire air pressure gauge when measuring the air pressure of a tire. Tire air pressure should be measured when the tire is cold, or before the vehicle is driven. (After driving, tire air pressure increases by about 10%.) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 301

Tire size Tire air pressure GVW kPa (psi) kg (lb.) Front Rear Front Rear 6 577 LT215/85R16E LT215/85R16E 550 (80) 550 (80) (14,500) 7 258 225/70R19.5F 225/70R19.5F 590 (85) 590 (85) (16,000) 8 142 225/70R19.5F 225/70R19.5F 620 (90) 620 (90) (17,950) 8 845 225/70R19.5F 225/70R19.5F 660 (95) 660 (95) (19,500)

See “VIN, Weight Rating, and Greenhouse Gas (GHG) Emissions Warning (Continued) Warning (Continued) Plate under Vehicle Identification ” Should they burst, the tires may may break and the wheel may Number (VIN) 0 353. burn and this could cause a fire in detach from the vehicle, possibly See “Tire Load and Inflation Table” the vehicle. causing a crash. under Tire Pressure 0 307. If you drive on under-inflated or Over-inflated tires result in a flat tires, the wheel studs will be harsh ride and are likely to cause { Warning placed under excessive stress. damage to the cargo. Insufficiently inflated or worn-out Under such conditions, the bolts Under-inflated tires build up heat tires are highly dangerous as they (Continued) (Continued) easily skid and can even burst. (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

302 Vehicle Care Cracks and Other Damage When checking tires, pay special Warning (Continued) attention to: low air pressure; pebbles or nails in tread grooves; and could burst. Always keep the cracks or other damage on tire tires of your vehicle adjusted at surfaces; uneven wear; and pebbles the standard air pressures. lodged in the gap between tires of You and others could be seriously dual-wheel tires. injured. Tread Depth and Abnormal Wear

There should not be a difference in air pressure between the inside and outside tires on a dual-tire wheel. It is not easy to visually identify an 1. Sidewall surface under-inflated dual-wheel tire or low 2. Gap between inner and aspect ratio tire (aspect ratio at outer tires 70%). Always use an appropriate 3. Tread tire air pressure gauge to check the air pressure of any tire. Check the tread and sidewall surfaces of each tire for cracks or If your vehicle is equipped with other damage. Especially check the Tread Wear Indicator Position aluminum wheels, use an extension tread for nails or other metal pieces Mark (Example) attached to the inner tire valve embedded in grooves and also the together with a standard tire air gap between the inner and outer pressure gauge or use a special air tires of a dual-tire wheel for pebbles pressure gauge when checking the lodged in it. air pressure of a dual-wheel's inner tire. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 303 Use of Low Aspect Ratio Tires { Warning

Tires with excessively shallow tread grooves will increase the chance of skidding and, when driving at high speeds, hydroplaning. You and others could be seriously injured. Tread Wear Indicator (Example) Hydroplaning occurs when a vehicle 1. Lug pattern is running at high speeds on a wet 2. Rib pattern road and a layer of water forms Using worn-out tires is dangerous between the road surface and tires because they might have an causing the tires to float on it. 1. Standard tire increased chance of getting Hydroplaning prevents the driver 2. Low aspect ratio tire punctured or bursting while driving. from steering correctly and from Check all tires to see if tread wear slowing down the vehicle with the Low aspect ratio tires for truck indicators appear on their treads brake pedal. applications (aspect ratio at 70%) and also check their entire tread for have an air volume 20% to 30% its depth with a depth gauge to smaller than that of standard tires. make sure that the grooves are Therefore, if air begins to leak, low deeper than the specified depth. aspect ratio tires adversely affect A tire with tread wear indicators vehicle operation much faster than appearing must be changed. Also, standard tires. Check air pressure of check the tires for uneven or low aspect ratio tires more often otherwise abnormal wear. than standard tires using a tire air pressure gauge. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

304 Vehicle Care Damaged Tires Danger (Continued) Danger (Continued) { Danger . If the tire looks as if it may start moving when the be underinflated, stand to engine power is transmitted It is dangerous to mount the the side and check whether to the rear axle even when wrong size tire on a wheel. If you the wheel assembly one of the wheels on the do so, the tire/wheel can explode appears normal by axle is raised clear of the as air is being added. This comparing it to another ground. Do not start the explosion may result in severe wheel assembly on the engine with any rear wheel personal injury or death. To learn vehicle. in contact with the ground. which wheels and tires are correct, look at the "VIN, Weight . Let the air out of the tire by If you are not fully taking out the valve core. experienced on the Rating, and Greenhouse Gas If you have a way to put air procedures to follow, and/or (GHG) Emissions Plate" on the back in a tire, note that it is are not equipped with the left side rear pillar panel below good safety practice to let proper tools and equipment, the striker (single cab) or on the the air out of both tires of a again, do not attempt to left center pillar panel beside the dual assembly before taking raise the vehicle, or remove shoulder seat belt anchor (crew off the damaged tire and rim or install the tire and wheel cab). Wheel size is also stamped assembly from the vehicle. assembly—seek expert tire on the side of each wheel. After letting out the air, take services. To help avoid personal injury and off the tire and rim assembly . Do not put air back in a tire property damage if a wheel must and install a spare tire and that has been run flat, or is be changed, seek expert tire rim assembly. seriously low on air, without services if you can. If you must If your vehicle is equipped first having the tire taken off remove the wheel without any with a differential lock the wheel and the tire such help, do the following: system or limited slip checked for damage. differential (LSD), it might (Continued) (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 305 Wheel Nut Torque Danger (Continued) Danger (Continued) . Note that taking off and . Tire mounting or repair can { Warning mounting tires on wheels result in serious personal Never use oil or grease on studs requires proper tools, safety injury or death, if not equipment and special performed correctly. This or nuts. Use the torque specified training. A person can be section has detailed for the type of wheels on the severely injured or killed instructions for proper wheel vehicle. Snug all wheel nuts and and damage can result from and tire replacement, so be then tighten to the specified using the wrong service sure to read and follow torque in the numerical sequence methods. Truck tires and them. Truck fleet owners shown. Improperly tightened wheels should be serviced and operators: You can get wheel nuts could eventually allow only by trained people using written instructions on truck the wheel to come off while the the proper equipment. tire demounting, repair and vehicle is moving, possibly . Never add air to your tires mounting from Rubber causing loss of control and unless an accurate pressure Manufacturers Association personal injury and property gauge is also used. When (RMA), 1400 K Street N.W., damage. putting air in a tire on the Washington, D.C. 20005, vehicle, stand to the side and also from many tire stores. When the vehicle, wheel or and use a clip-on chuck and fasteners are new, have a hose extension. In choosing technician tighten wheel stud nuts the right tire pressure, be and rim clamp nuts with a torque careful not to exceed the wrench at 1 040 km (650 mi). This is maximum pressure necessary because the clamping capability shown on the tire; system used on the wheels must see the tire pressure charts seat before the fastener will hold a in this manual. uniform clamp load and remain fully (Continued) tightened. Also have a technician Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

306 Vehicle Care tighten wheel stud nuts and rim clamp nuts with a torque wrench Warning (Continued) after installing any wheel. that wheel should be replaced. In addition, nut tightness on all A loose running wheel may cause wheels should be set with a torque only one stud to break but wrench every 10 400 km (6,500 mi). damage to other studs may not Tightening torque be noticeable. If stud holes in a 500 N·m (362 lb·ft) wheel have become elongated or distorted, replace the wheel. Wheel Tightening Sequence Some studs and nuts have left-hand threads. Those studs are marked on 2. Tighten all nuts to specified their ends with the letter "L". torque in order as shown. Never use oil or grease on the Install valve stems of dual wheels studs or nuts. 180 degrees opposite each other. 3. If a wheel stud and nut has 1. Finger-tighten the nuts. been replaced, stake the stud and nut.

{ Warning

To help reduce the risk of losing vehicle control and personal injury or death, if any stud has been damaged as a result of a loose running wheel, all studs for (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 307 Tire Pressure Tire Load and Inflation Table Tire Load and Inflation Table TIRES FOR VEHICLES IN HIGHWAY SERVICE TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES Tire Size Designation Cold Inflation Pressure (psi) 50 55 60 65 70 75 80 85 90 95 LT215/85R16E Dual (lbs) 2470 Single 2680 225/70R19.5F Dual (lbs) 3115 3245 3415 Single 3315 3450 3640

See Wheels and Tires 0 295. sure to use tires of the same type Warning (Continued) on the same axle. If you install tires of different types on the same axle, Tire Rotation If you find any abnormal condition the vehicle may drift right or left on the wheel studs, wheel nuts or when you apply the brakes. { Warning disc wheel, do not continue to use the wheel. Contact the nearest New tires are more likely to build up Be sure to check the wheel studs, dealer as soon as possible heat and wear faster than old tires, wheel nuts and disc wheel for any so they should be installed on the abnormality whenever the disc front axle where the load is smaller. wheel is removed. Tires at different locations wear differently. For uniform tire wear and If there is a difference in diameter (Continued) longer tire life, you should rotate the between the inner and outer tires of tires on your vehicle regularly. Make a dual-tire wheel, install the smaller diameter tire inside. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

308 Vehicle Care The difference in diameter of the Retightening Wheel Nuts Warning (Continued) tires for a dual-tire wheel should be Check the wheel nuts to make sure within the limit specified in the table tires may get loaded beyond their they are tightened to the specific below. If the limit is exceeded, the torque by using a torque wrench. tires wear more rapidly than they limits. This will also affect vehicle should. handling, brake performance, and Use the following methods to check ride comfort. This is highly loose wheel nuts. The tightening dangerous because the tires and torque of the wheel nuts may disc wheels could break down decrease after a tire change or under an excessive load. You and rotation due to their initial others could be seriously injured. settlement. After driving 1 040 km (650 mi) and after 10 400 km (6,500 mi), be sure to retighten the Permissible diameter difference wheel nuts to the specified torque. Radial tire Within 8 mm (0.31 in) Repeat whenever a wheel, wheel bolt, or wheel nut is removed. The tightening torque of the wheel Tightening torque nuts may decrease after a tire change due to their initial 500 N·m (362 lb·ft) settlement. Upon driving 50 to { Warning 100 km (31 to 62 mi) after a tire change, retighten the wheel nuts to If tires of different sizes, load the specified torques according to ranges, constructions, or tread the instructions in "Retightening designs are used between the Wheel Nuts" following. front and rear axles, do not 0 exchange tires between the front See Maintenance Schedule 327. and rear axles; otherwise, the (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 309 Single Tire Retightening of nuts on left rear dual-tire wheel Dual Tire

2. Tighten the inner wheel nuts of the same wheel to the specified torque. 1. Left side tire 2. Right side tire Turn the wheel nuts in the tightening 1. Inner Nut direction to the specified torque. 2. Outer Nut 1. Loosen the outer wheel nuts on the wheel studs. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

310 Vehicle Care 3. Next, tighten the outer wheel When replacing a tire with a new nuts to the specified torque. one, use only a tire of the same { Warning type and size as the replaced tire; If you continue to drive on a flat { Warning otherwise, driving safety could be affected. Avoid mixed use of tire, undue force will be applied to If you find any abnormal different types or different size tires the wheel studs, possibly causing conditions with the wheel nuts at all costs. the studs to break and the wheel such as frequent loosening of to come off. You and others could retightened nuts, have your If a Tire Goes Flat be seriously injured. vehicle checked or serviced at the When the tire goes flat while driving, nearest dealer as soon as ease off the accelerator pedal, avoid See “Tire Replacement possible. hard braking, hold on to the steering Recommendations” under Wheels 0 wheel firmly, and stop the vehicle. and Tires 295. Fully engage the wheel wrench on a The tire should be changed in a wheel nut in order to tighten the nut safe, open location to prevent to the specified torque. However, do obstructing other vehicles or not use a pipe as a handle pedestrians. extension or your foot to apply force on the wrench. This would tighten the nut more than required and might damage components. Both under-tightening and over-tightening of wheel nuts may cause broken wheel studs or cracked disc wheels and could lead to wheel detachment. Adhere to the specified tightening torques. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 311

Jump Starting Danger (Continued) Danger (Continued) Jump Starting - North at least 5 minutes. Following this, Batteries produce explosive America you should seek medical gases, contain corrosive acid, assistance. and supply levels of electrical When the Battery is When using tools or other metal current high enough to cause Discharged objects in the vicinity of the burns. Therefore, to reduce the Use a jumper cable (sold battery, take care to prevent them risk of personal injury when separately) and the battery of from coming into contact with the working near a battery: another vehicle to start the engine in positive terminal. As the vehicle . Always shield your eyes the following sequence. itself will conduct electricity, any and avoid leaning over a such contact can result in a battery whenever possible. { Danger short-circuit and a highly . Do not expose a battery to dangerous electric shock. open flames or sparks. Follow the precautions listed in the jump starting instructions A vehicle battery generates . Do not allow battery acid to when working on or near the extremely flammable hydrogen contact eyes or skin. Flush battery. Personal injury gas. For this reason, operations any contacted area with (particularly to eyes) or property producing sparks or requiring the water immediately and damage may result from battery usage of an open flame must thoroughly, and get explosion, battery fluid or never be carried out near a medical help. electrical (short circuit) burns. vehicle battery. Failure to observe . Follow each step in the this precaution can result in jump starting instructions. If battery fluid should come in explosion if the hydrogen gas contact with an eye, immediately ignites. Whenever wiping up Always stop the engine whenever wash away using a large amount battery fluid, a damp cloth should the battery is to be inspected. of water and continue washing for be used. (Continued) (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

312 Vehicle Care

Danger (Continued) Warning (Continued) Warning (Continued)

Dilute sulfuric acid is used as the Never tow the vehicle to start Do not disconnect a battery battery fluid. Special care must be because a surge forward when terminal with the engine running. taken to ensure that this fluid the engine starts could cause a It could cause a breakdown in the does not come into contact with collision with the tow vehicle. electrical system. skin, clothing, or metal surfaces. Also, this vehicle has a 12-volt You and others could be seriously When disconnecting the cables battery, 12-volt starting system injured. from the terminals, start with the and a negative ground electrical negative terminal. When system; be sure the vehicle or If you notice battery fluid leaking, connecting them, the negative equipment used to jump start your have an inspection carried out terminal should be engine is also 12-volt. Use of any immediately by the nearest dealer. reconnected last. other system may damage the vehicle's electrical components. Diesel engine vehicles have more You and others could be seriously than one battery because of the injured. Under no circumstances should higher torque required to start a the battery's positive and negative diesel engine. This procedure can terminals be put in contact with be used to start a single-battery one another. vehicle from any of the diesel { Warning vehicle's batteries. However, at low When connecting the cables, temperatures, it may not be possible For safety and the protection of under no circumstances should to start a diesel engine from a single the vehicle, do not push-start the the clips be allowed to touch each battery from another vehicle. vehicle. other. 1. Use a vehicle that has a (Continued) (Continued) charged battery with the same voltage. Make sure that the other vehicle also has a 12-volt starting system, and that it is Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 313 the negative (–) terminal which Make sure the cables are not is grounded (attached to the on or near pulleys, fans or engine block, or frame rail). other parts that will move when 2. Position the vehicle with the the engine is started. good (charged) battery so that When it is difficult to start the the booster (jumper) cables will engine in a cold area, first start reach. But never let the the engine of the vehicle with vehicles touch. Also, be sure the booster battery or batteries the booster cables to be used and a few minutes after that do not have loose or missing start the engine of the disabled insulation. vehicle. 3. In both vehicles, turn off the 4. Unlatch the latches (1) and ignition (engine control) switch remove the battery cover (2) and all lights and accessories and connect the jumper cables except the hazard flasher or in the numbered sequence in any lights needed for the work the drawing below. Make sure area. In both vehicles, apply the cable clamps do not touch the parking brake firmly and any other metal parts. move the selector lever to the "P" position. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

314 Vehicle Care 7. If the engine in the disabled vehicle starts, remove the jumper cables in the reverse sequence as they were connected.

5. After connecting the cables, 6. Slightly rev up the engine of start the engine of the vehicle the vehicle with the booster with the booster battery. battery and start the engine of the disabled vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 315 Towing the Vehicle Front End Towing (Front Wheels Ensure towing chains do not come Off Ground) into contact with the horns or the Consult your dealer or a To prepare a disabled vehicle for bumper. (If towing chains contact professional towing service if the front end towing with front wheels the bumper, then remove the disabled vehicle must be towed. raised off the ground, the following bumper.) Proper equipment must be used to steps are necessary: prevent damage to vehicles during . Block the rear wheels of the any towing. State and local laws disabled vehicle. which apply to vehicles in tow must be followed. Vehicles should not be . Disconnect the driveshaft at the towed at speeds in excess of rear axle. Secure the driveshaft 88 km/h (55 mph). to the frame or crossmember. Connect to the main structural parts When towing, disconnect the of the vehicle. Do not attach to driveshaft at the rear axle to ensure bumpers, tow hooks or brackets. the transmission is not damaged. Use only equipment designed for The rear end of the driveshaft must this purpose. Follow the instructions be disconnected and safely secured of the wrecker manufacturer. if the 80 km (50 mi) or 48 km/h 1. Horns A safety chain system must (30 mph) is exceeded. 2. Bumper be used. If there is damage or suspected The procedures below must be damage to the rear axle, remove the After Towing followed when towing to prevent axle shafts. Cover the hub openings After towing the vehicle, block the possible damage. to prevent the loss of lubricant or rear wheels and install axle shafts entry of dirt or foreign objects. or driveshaft. Place a 10 cm (4 in) wood beam Apply the parking brake before against the towing guide behind the disconnecting from the towing bumper. (If no 10 cm (4 in) is vehicle. available, then remove the bumper.) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

316 Vehicle Care Front End Towing (All Wheels On To prepare a disabled vehicle for After Towing the Ground) front end towing with all wheels on After towing the vehicle, block the Your vehicle may be towed on all the ground, the following steps are rear wheels and install axle shafts wheels provided the steering is necessary: or driveshaft. operable. Remember that power . Block the rear wheels of the Apply the parking brake before steering and brakes will not have disabled vehicle. disconnecting from the towing power assist. There must be a tow . Disconnect the driveshaft at the vehicle. Check and fill rear axle with bar installed between the tow rear axle. Secure the driveshaft oil, if required. vehicle and the disabled vehicle. to the frame or crossmember. Rear End Towing When towing, disconnect the driveshaft at the rear axle to ensure When towing a vehicle with rear the transmission is not damaged. wheels raised, secure the steering wheel to maintain straight-ahead The rear end of the driveshaft must position. Make certain that the front be disconnected and safely secured axle is not loaded beyond the front if the 80 km (50 mi) or 48 km/h axle gross axle weight rating (30 mph) is exceeded. (GAWR) as indicated on the Provide wood blocking to prevent vehicle's VIN and weight rating towing chains and bar from coming plate. into contact with the bumper. Special Towing Instructions If there is damage or suspected 1. All state and local laws Towing with all wheels on the damage to the rear axle, remove the ground regarding such items as axle shafts. warning signals, night 1. Bumper Cover the hub openings to prevent illumination, speed, etc., must 2. Tow Hook the loss of lubricant or entry of dirt be followed. 3. Front Axle or foreign objects. 2. Safety chains must be used. 4. Towing Guide 5. Towing Chain Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 317 3. No vehicle should ever be Appearance Care conditions such as high-pressure towed over 88 km/h (55 mph). car washers may cause water to 4. Loose or protruding parts of Exterior Care enter inside the vehicle. If the damaged vehicles should be vehicle is operated with foreign secured prior to moving. Exterior Finish material adhering to the exterior, this material may react chemically 5. A safety chain system The paint finish on your vehicle with paint, resulting in staining, completely independent of the provides beauty, depth of color, discoloration, rusting or corrosion of primary lifting and towing gloss retention and durability. components. Also, the material may attachment must be used. While cleaning the vehicle, do not become trapped within mechanical 6. Operators should refrain from grip the roof marker lights to prevent components, adversely affecting going under a vehicle which is damage or water leakage. their functions or forming an being lifted by the towing aerodynamic resistance. In the Washing equipment unless the vehicle is following cases, therefore, the adequately supported by safety The best way to preserve your vehicle must be washed and all stands. vehicle's finish is to keep it clean by foreign matter removed. washing it often. 7. No towing operation which for . When soot, iron powder, dead any reason jeopardizes the Wash the vehicle in lukewarm or bugs, bird droppings, tree sap or safety of the wrecker operator cold water. Do not use hot water or oily matter from coal tar and or any bystanders or other wash your vehicle in the direct rays smoke has adhered to painted motorists should be attempted. of the sun. Do not use strong soap surfaces. or chemical detergents. All cleaning . When the vehicle has been agents should be flushed promptly driven in coastal areas. from the surface and not allowed to dry on the finish. . When the vehicle has been driven on roads where road These vehicles are designed to chemicals have been applied. operate under normal environmental conditions to withstand natural . When a large amount of mud or elements. However, unusual dirt has adhered to the exterior. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

318 Vehicle Care To wash the vehicle: electronic control units and electrical Warning (Continued) 1. Fully turn on the tap, and wash components, or in rusting of the cab floor. Do not apply water from a out the undercarriage and volatile cleaning solvents, such as suspension. high-pressure washer nozzle acetone, lacquer thinners, enamel directly to the electric connectors. 2. Close all openings and wash reducers, nail polish removers; or Failure to observe this precaution the cab and cargo body panels such cleaning materials as can lead to faulty operation of the using a neutral detergent. laundry soaps, bleaches or electrical system. If an automatic 3. Clean wheels and tires using a reducing agents, except as noted car or truck-wash is used with brush and detergent. in the following fabric cleaning vehicles having dark or metallic advice on stain removal. coating, the painted surfaces can be 4. After washing away all Never use carbon tetrachloride, damaged by the brushes, lose their remaining detergent, use a luster or be very noticeably gasoline, benzene or naphtha for shammy or other clean cloth to scratched. fully remove all moisture and any cleaning purpose. Open all water droplets vehicle doors for ventilation when Do not direct a large amount of ANY cleaning agents or other water at the air inlet openings. Do not apply water to the engine { Warning chemicals are used in the interior. Overexposure to some vapors compartment or at electrical Follow the manufacturer's advice may result in a health problem components. Failure to observe this whenever cleaning agents or that is more likely to occur in precaution can lead to a poorly starting and operating engine and other chemicals are used, inside small, unventilated spaces. problems in the electrical system. or outside the vehicle. Some You and others could be seriously Ensure that mirrors and the antenna cleaners may be poisonous or injured. are retracted before washing the flammable, and improper use may vehicle. cause personal injury or damage. When cleaning the inside or Do not apply water directly in order If an automatic car or truck-wash outside of the vehicle, do not use to clean the cab interior. Failure to must be used, avoid a observe this precaution can result in high-temperature, high pressure (Continued) malfunction or breakdown of type machine. Failure to observe Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 319 this precaution can lead to heat Vehicle Storage Polishing and Waxing deformation and breakage of plastic In order to maintain your vehicle's Periodic polishing and waxing is components, or to water leaks into attractive appearance as long as recommended to remove built-up the cab. When using an automatic possible, special consideration must residue and eliminate any car or truck-wash, ensure that a be given to its storage location. "weathered" appearance. distance of at least 0.4 m (15.75 inches) is maintained If the vehicle is stored or kept for an Your authorized dealer offers between the nozzle and the vehicle, extended period of time in any of several polishes and cleaners which and when washing door windows, the following locations, a chemical have proven value in maintaining that the spray is perpendicular to change may occur in the paint work, original finish appearance and the surface of the glass. resulting in staining, discoloration, durability. rusting, and corrosion of Ensure that all detergent is fully Painted and chrome-plated surfaces components. washed and wiped away. should be waxed once or twice a Particularly in the case of strong . Locations where a large amount month, or whenever water is being alkaline detergents (typically those of oily matter, soot, heavy smoke poorly repelled on the surfaces. for industrial uses), there is a or metal powder can adhere to Ensure that wax is not applied in danger that hairline cracks can the vehicle. direct sunlight, and that the develop in lighting-cluster lenses if . Areas around pharmaceutical temperature of the painted surface the vehicle is operated without plants and other facilities that is no more than 40 °C (104 °F). detergent being fully wiped away. discharge chemical matter. Always follow the instructions Always read the detergent provided with your wax product. manufacturer's instructions carefully . Coastal areas before use. Airborne dirt that . Locations where a large amount Do not use wax containing abrasive adheres to plastic front bumpers as of dead bugs, bird droppings or material. Failure to observe this a result of rain, for example, can be tree sap can adhere to the precaution can lead to scratching of difficult to remove. In such a case, vehicle. painted surfaces or plastic use a commercially-available components. cleaner to clean away the dirt, and then apply a wax for use with plastic components. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

320 Vehicle Care The application of wax to rubber lubricant should be applied using a Clean the outside of the windshield component surfaces can result in clean cloth. Weatherstrip lubricant with a non-abrasive cleaner. Your permanent whitening. application will lengthen windshield is clean if beads do not Wax must not be applied to the weatherstrip life, help sealing, and form when rinsing with water. Clean windshield. Failure to observe this assist in eliminating squeaks. the blade by wiping with a cloth soaked in a solution of one-half precaution can result in irregular Windshield Care reflection of light, impairing water and one-half methanol your view. Wax must not be applied to the alcohol. Then rinse the blade with windshield. A layer of wax can water. Protecting Exterior Bright Metal impair your view in rainy weather The windshield wiper arms may be Parts and can also lead to rough swung out, away from the glass, to Bright metal parts should be movements of the windshield wiper. provide easy access for cleaning. cleaned regularly to keep their If engine oil or grease comes into contact with the windshield, staining Do not hang on to the roof marker luster. Washing with water is all that lights while cleaning the windshield is usually needed. or discoloration may result. It must be immediately cleaned away. or damage may occur (resulting in Use special care with aluminum possible water leakage). trim. To avoid damaging protective If not fully cleaned by the windshield trim, never use auto or chrome wipers, the windshield should be External Diesel Engine polish, steam or caustic soap to cleaned using glass cleaner. If your Cleaning windshield is not clear after using clean aluminum. A coating of wax, The engine does not need periodic the windshield washer, or if the rubbed to a high polish, is cleaning, nor is it recommended. recommended for all bright metal wiper blade chatters when running, parts. wax or other material may be on the If you insist on cleaning the engine, blade or windshield. clean it only when it is cold, never Weatherstrip Lubrication when it is warm or hot, and never The windshield wipers on your truck when the engine is running. All weatherstrips should be can be pulled out from the Spraying or pouring water or other periodically lubricated (minimum of windshield to provide easier access fluids on your engine when it is every 6 months) with a weatherstrip for cleaning. lubricant. A thin film of weatherstrip warm or hot, or when it is running, Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 321 can cause serious damage to the This can also cause corrosion of engine and its components, these cores. Wash the radiator core particularly the fuel supply pump. with tap water every 24 months. Handling the Radiator and Make sure to turn the engine off and Charge Air Cooler remove the key from the engine control switch before cleaning Cleaning the Radiator Core and cores. Charge Air Cooler Core The engine, exhaust pipe, and radiator will be hot immediately after the vehicle is driven. Be careful around these parts to prevent burns. Clean the engine when it is cold. Do not clean the radiator, charge air cooler (diesel) and their surrounding areas using water that is supplied under high pressure. Doing so may cause damage.

Cooling efficiency is compromised when there is dirt or dust plugging air passages in the radiator core and charge air cooler core (diesel). Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

322 Vehicle Care Corrosion Protection Foreign Material Deposits Your vehicle has been designed and Calcium chloride and other salts, built to resist corrosion. Special ice-melting agents, road oil and tar, materials and protective finishes tree sap, bird droppings, chemicals were used on most parts of your from industrial chimneys and other vehicle when it was built to help foreign matter may damage vehicle maintain good appearance, finishes if left on painted surfaces. strength, and reliable operation. Prompt washing may not completely However, some parts which remove all of these deposits. Other normally are not visible (such as cleaners may be needed. When those under the vehicle and under using chemical cleaners, be sure the hood) are such that surface rust they are safe for use on painted When cleaning the radiator core (1) will not affect their reliability. So surfaces. corrosion protection is not needed and charge air cooler core (2) , do Finish Damage not crush or damage the fins (3). or used on these parts. The fins are very fragile so be Any stone chips, fractures or deep Sheet Metal Damage careful not to bend them out of scratches in the finish should be shape. If they become deformed, If your vehicle is damaged and repaired promptly. Bare metal will their cooling efficiency will be requires sheet metal repair or corrode quickly and may develop impaired. Before cleaning, take replacement, make sure the body into major repair expense. Minor steps to ensure that no water will repair shop applies anti-corrosion chips and scratches can be repaired splash onto the surrounding material to the parts repaired or with touch up materials available electrical components and wires. replaced so that corrosion protection from your authorized dealer or other If stubborn dirt still remains even is restored. (Also see "Finish service outlets. Larger areas of after the radiator core and charge Damage" which follows.) finish damage can be corrected in air cooler core (diesel) have been your dealer's body and paint shop. cleaned, have the vehicle inspected and serviced. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 323 Underbody Maintenance cleaner, and gently wipe surfaces clean using a cloth wet with warm or Warning (Continued) Corrosive materials used for ice and cold water. snow removal, and dust control can life-threatening injuries could collect on the underbody. If these result. When cleaning, use warm materials are not removed, { Warning water in which a small amount of accelerated corrosion (rust) can neutral detergent has been occur on underbody parts such as Water should never be sprayed directly into the interior of the cab dissolved to gently wipe the fuel lines, frames, floor pan and safety belts. exhaust system even though they when cleaning. Failure to observe have been provided with corrosion this precaution can lead to vehicle Follow the manufacturer's advice protection. malfunction and possibly to fire if whenever cleaning agents or water should enter the audio other chemicals are used, inside At least every spring, flush these system or other electrical or outside the vehicle. Some materials from the underbody with components located underneath plain water. Take care to clean well cleaners may be poisonous or the floor carpet. any areas where mud and other flammable, and improper use may debris can collect. Sediment packed Petroleum ether, gasoline and cause personal injury or damage. in closed areas of the frame should other organic solvents should not When cleaning the inside or be loosened before being flushed. be used to clean safety belts. In outside of the vehicle, do not use If desired, your authorized dealer addition, safety belt webbing volatile cleaning solvents, such as can do this for you. should be neither bleached nor acetone, lacquer thinners, enamel redyed. Failure to observe these reducers, nail polish removers; or Interior Care precautions can lead to the such cleaning materials as laundry soaps, bleaches or General performance or strength of the safety belts being impaired. In the reducing agents, except as noted Remove dust and dirt from the case of a collision, therefore, the in the following fabric cleaning interior of the cab using an safety belts could be insufficiently advice on stain removal. Never automotive cleaner or vacuum effective, and serious (Continued) (Continued) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

324 Vehicle Care Air fresheners (liquid, solid, gel, spots, spot rings, or setting of stains Warning (Continued) or plate types) must not come into or soilage — all of which are more direct contact with, or spill onto, difficult to remove in a second use carbon tetrachloride, interior components such as the air cleaning. gasoline, benzene or naphtha for conditioning or audio system. any cleaning purpose. Dust and loose dirt that collect on Compounds contained in these interior fabric should be removed Open all vehicle doors for products can cause discoloration, often with a vacuum cleaner or soft ventilation when ANY cleaning staining, or peeling of paint. bristle brush. Wipe vinyl or leather agents or other chemicals are Glass cleaners that contain these trim regularly with a clean, damp used in the interior. Overexposure compounds must not be used to cloth. Normal trim soils, spots, to some vapors may result in a clean the inside of the windshield or or stains can be cleaned with these health problem that is more likely window glass. To clean the glass, cleaners. to occur in small, unventilated wipe it using a cloth wet with warm Remember these basic steps before spaces. or cold water. cleaning: You and others could be seriously To avoid possible permanent . Remove stains as quickly as injured. discoloration of light colored seats, possible before they set. Do not let materials with non-fast colors come into contact with seat . Use a clean cloth or sponge, The interior of the vehicle must trim materials until these materials and change to a clean area never be cleaned using acidic or are totally dry. This includes certain often. A soft brush maybe used alkaline solvents, or petroleum types of casual clothing, such as if stains persist. ether, gasoline, and other organic colored denims, corduroys, leathers, solvents. Failure to observe this . Use solvent-type cleaners only and suedes, as well as decorative in a well ventilated area: also, do precaution can result in paper. discoloration and staining. It should not saturate the stained area. be noted that certain types of With the use of modern trim . If a ring forms after spot cleaning products contain these materials, it is very important that cleaning, clean the entire area compounds. Be sure to read you use proper cleaning techniques immediately. cleaning product labels carefully. and cleaners. Failing to do this on the first cleaning may result in water Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Vehicle Care 325 . Follow specific instructions on suede, raise nap with a dry scrub feathering towards the center. cleaner labels. brush and vacuum to remove any Keep changing to a clean final traces of residue. section of cloth. General Cleaning of Soiled or Water Spotted Fabric Type Spot Cleaning Fabric Type . When you clean a stain from Trim with Foam Type Cleaner Trim with Solvent Type Cleaner fabric, immediately dry the area with an air hose, heat dryer, Vacuum the area thoroughly to Before trying to remove a spot or or heat lamp to help prevent a remove any loose dirt. stain from fabric, try to find out the cleaning ring. Use caution with type and age of the spot or stain. Always clean a whole trim panel or heat dryer or lamp to help Some spots or stains can be section. Mask surrounding trim prevent fabric damage. removed with water or a mild soap along stitch or welt lines. solution. Spots or stains should . If a ring forms, immediately Use suds on a clean sponge. Do always be removed as soon as repeat the cleaning operation not brush wet suede. Do not possible. over a slightly larger area with saturate the material or rub it emphasis on feathering towards Some types of stains or soilage, harshly. Immediately after cleaning, its center. If a ring still remains, such as lipstick, inks, and grease, remove suds with a sponge and mask off surrounding trim are very difficult (sometimes rinse with a clean wet sponge. Wipe sections and clean the entire impossible) to remove completely. off remaining residue with a slightly soiled area with a foam type When cleaning this type of stain or damp absorbent towel or cloth. cleaner. soilage, be sure not to enlarge the Immediately after wiping, force-dry soiled area. See “Removal of Specific the fabric with an air hose. A heat Stains.” . Gently scrape excess stain from dryer or heat lamp may be used. the trim material with a clean, Removal of Specific Stains Use caution with a heat dryer or dull knife or scraper. Use very lamp to help prevent damage. Greasy or Oily Stains – Includes little cleaner, light pressure, and grease, oil, butter, margarine, shoe When trim materials with a sheen or clean cloths, preferably polish, coffee with cream, chewing luster finish are dry, wipe the fabric cheesecloth. Cleaning should gum, cosmetic creams, vegetable lightly with a soft, dry, clean cloth to start at the outside of the stain oils, wax crayon, tar, and asphalts. restore its sheen or luster. For Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

326 Vehicle Care . Carefully scrape off excess . Finally, if needed, clean lightly off as quickly as possible and stain; then use solvent type with Fabric Cleaner the area cleaned with a clean cleaner. (Solvent type). cloth dampened with solvent type vinyl leather cleaner. . Shoe polish, wax crayons, tar, Combination Stains – Includes and asphalts will stain if left on candy, ice cream, mayonnaise, chili Fabric Seat Covering and trim; they should be removed as sauce, and unknown stains. Carpet Care soon as possible. Use care as . Carefully scrape off excess cleaner will dissolve them and Remove dirt and dust using a stain; then clean with cool water home-use electric vacuum cleaner. may cause them to bleed. and allow to dry. Non-Greasy Stains – Includes Do not remove the carpet. Use . If stain remains, clean it with standard household cleaning catsup, coffee (black), egg, fruit, Fabric Cleaner (Solvent type). fruit juice, milk, soft drinks, wine, products and methods to remove vomit, and blood. Cleaning Vinyl Trim stains from food, drink, and the like. . Carefully scrape off excess Ordinary soilage can be removed Be sure to use neutral detergents or stain; then sponge the stain with from vinyl or leather with warm cleaning products indicated as cool water. water and mild soap, such as higher alcohol based detergents. . If a stain remains, use saddle soap or oil soap, or an Glass Surfaces equivalent. Multi-Purpose Powdered Glass surfaces should be cleaned Cleaner (Foam type) as . Apply a small amount of soap on a regular basis. Use of glass previously described. solution and let it soak for a few cleaner or a liquid household glass . If an odor lingers after cleaning minutes to loosen dirt; then, rub cleaner will remove normal tobacco vomit or urine, treat the area briskly with a clean, damp cloth smoke and dust films sometimes with a water-baking soda to remove dirt and traces of caused by ingredients used in vinyls solution: 5 milliliters (1 teaspoon) soap. This may be done several and interior plastics. of baking soda to 250 milliliters times, if needed. (1 cup) of lukewarm water. . Soilage such as tars, asphalts, shoe polish, etc., will stain if left on trim. They should be wiped Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 327 Maintenance vehicle with peace of mind. They Service and also extend the vehicle's Maintenance Schedule service life. For safe and economical driving, we Caution recommend that you have your Maintenance Schedule vehicle inspected and serviced Maintenance Schedule ...... 327 Damage caused by improper regularly according to the schedule maintenance can lead to costly indicated in this chapter. Owner Checks and Services repairs and may not be covered To drive your vehicle safely and at Owner Checks and by the vehicle warranty. minimum cost, it is essential to have Services ...... 340 Maintenance intervals, checks, your vehicle regularly inspected and inspections, recommended fluids, Additional Maintenance serviced at your dealer as per the and Care and lubricants are important to specified maintenance schedule. Additional Maintenance keep the vehicle in good working and Care ...... 346 condition. Contact your dealer for inspection that requires disassembly and/or Recommended Fluids, Do not have chemical flushes that special equipment. Lubricants, and Parts are not approved by GM performed on the vehicle. The The Maintenance Schedule in this Recommended Fluids and manual and a Warranty Information use of flushes, solvents, cleaners, Lubricants ...... 349 Booklet are supplied with your or lubricants that are not Maintenance Replacement vehicle. Read all publications for a Parts ...... 351 approved by GM could damage full understanding of your vehicle's the vehicle, requiring expensive maintenance needs. repairs that are not covered by the vehicle warranty. The quality of maintenance your new vehicle receives is as important as the regularity with which it is Make sure the vehicle is inspected serviced. Authorized dealers provide at regular intervals. Inspections and nationwide quality in customer maintenance enable you to use the service. The program includes the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

328 Service and Maintenance training of dealer technicians The schedule includes general vehicles), or vehicles operated for throughout the country and is maintenance which you or a frequent short trips, will require supported with a continuous qualified technician should perform more frequent vehicle maintenance. follow-up of publications and other periodically. The log groups items according to service information. The use of mile/kilometer service intervals. Use genuine parts and accessories, Explanation of Vehicle Maintenance and Log the item codes (letter and number) which have the same high quality to find the description of the standards as original equipment The following is a brief explanation maintenance and the time intervals. parts, and the use of factory of normal vehicle use. approved tools developed and Follow whichever interval comes tested for use by the authorized NORMAL VEHICLE USE—The first, time or miles/kilometers. maintenance instructions contained dealer also contribute to the high After the maintenance services are quality of service. in this section are based on the assumption that your vehicle will be performed, insert the month, day If you have any questions on how to used as designed: and mileage/ kilometers in the area keep your truck or chassis in good provided next to the serviced item. . To carry passengers and cargo condition, see your authorized The services shown up to dealer, the place many truck owners with the limitations indicated on the vehicle VIN and GVW plate. 176 000 km (110,000 miles) are to choose to have their maintenance be repeated after the initial work done. Your authorized dealer . On reasonable road surfaces 176 000 km (110,000 miles) at the can be relied upon to use proper within legal operating limits. same intervals. parts and practices. . On a daily basis, as a general Severe Driving Conditions Some of these services can be rule, for at least several miles/ complex, so unless you are kilometers. A vehicle operated under severe technically qualified and have the conditions (see list below) requires Unusual operating conditions, such necessary equipment, you should more frequent maintenance. as driving in dusty areas (sweeper, let your authorized dealer's service agricultural or off-road vehicles), . Frequent short trips of less than department or another qualified extended idling (refrigeration 6 kilometers (4 miles) in service center do these jobs. moderate temperatures Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 329 . Frequent short trips of less than be emphasized as critical to Maintenance Schedule Table 16 kilometers (10 miles) in sub- malfunction but each is dependent freezing temperatures upon the other. For example, if a Letters Used to Indicate Maintenance Service Types . Frequent and extended low- vehicle is repeatedly overloaded, speed engine operation (door- driven at excessive speed or I: Inspect then clean, repair or to- door deliveries, stop- and- go improperly shifted, no schedule of replace as necessary maintenance can prevent traffic, etc.) A: Adjust malfunction. Also, if a preventive . Driving on unpaved roads with maintenance schedule is not R: Replace heavy dust followed, or is improperly carried T: Tighten to the specified torque . Towing a trailer out, no amount of correct vehicle operation will prevent malfunction. L: Lubricate Power Take Off (PTO) and If vehicle application, operation and C: Clean Extended Idle Use preventive maintenance schedules When the vehicle is used with the and procedures are followed and PTO equipment or used in a way properly carried out, the life of the that requires extended idle time, vehicle will be greatly extended. one hour of use shall be deemed For example, regular attention to the the same as 33 miles. See Driver 0 engine oil is essential. The oil level Information Center (DIC) 82 for must be periodically checked and oil hourmeter. added whenever needed. Also, the Preventive Maintenance oil should be changed at the intervals specified with the proper As any mechanical device operates, quality and viscosity of oil. If your a certain amount of wear occurs. engine should run excessively low The amount of wear depends on on oil or if the oil has lost its certain variables – type and method lubricating qualities because of old of operation and the schedule of age, serious engine damage could maintenance. These variables may occur. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

330 Service and Maintenance

Service intervals months or kilometers (miles) whichever 16 000 km/10,000 mi 24 000 km/15,000 mi 32 000 km/20,000 mi 48 000 km/30,000 mi 64 000 km/40,000 mi 72 000 km/45,000 mi 80 000 km/50,000 mi 96 000 km/60,000 mi 112 000 km/70,000 mi 120 000 km/75,000 mi 128 000 km/80,000 mi 144 000 km/90,000 mi 176 000 km/110,000 mi No. Service Interval 160 000 km/100,000 mi 168 000 km/105,000 mi occurs first (1) 1 Engine noise check I - I I I - I I I - I I I - I or every 2 Valve lash - - - A - - - A - - - A - - - 12 months or every 3 Engine oil and oil filter (2) R - R R R - R R R - R R R - R 12 months or every 4 Fuel filter - R - R - R - R - R - R - R - 24 months Pre-fuel filter/water or every 5 -R-R-R-R-R-R-R- separator 24 months 6 Air cleaner filter ------indicator (3) Damage to air intake or every 7 -I-I-I-I-I-I-I- ducts and hoses 12 months or every 8 Drive belts I - I I I - I I I - I I I - I 12 months 9 Engine bolt torques ------I - - - - - I - - 10 Rotate tires Every 10 400 km (6,500 miles) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

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Service intervals months or kilometers (miles) whichever 16 000 km/10,000 mi 24 000 km/15,000 mi 32 000 km/20,000 mi 48 000 km/30,000 mi 64 000 km/40,000 mi 72 000 km/45,000 mi 80 000 km/50,000 mi 96 000 km/60,000 mi 112 000 km/70,000 mi 120 000 km/75,000 mi 128 000 km/80,000 mi 144 000 km/90,000 mi 176 000 km/110,000 mi No. Service Interval 160 000 km/100,000 mi 168 000 km/105,000 mi occurs first (1) or every 11 Engine cooling system I - I I I - I I I - I I I - I 12 months Every 12 months: I 12 Engine coolant Every 24 months: R (when dealer recommended coolant is used) 13 Exhaust system I - I I I - I I I - I I I - I or every 14 DPF (clean filter) ------C - - 3,000 hours DPF (pressure difference or every 15 sensor 0 point ------A-- 3,000 hours adjustment) DPF (pressure difference Every 160 000 km (100,000 miles): I or every 16 sensor hose) Every 400 000 km (250,000 miles): R 3,000 hours: I or every 17 Fuel line system I - I I I - I I I - I I I - I 12 months Brake lining and pad 18 I-III-III-III-I for wear Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

332 Service and Maintenance

Service intervals months or kilometers (miles) whichever 16 000 km/10,000 mi 24 000 km/15,000 mi 32 000 km/20,000 mi 48 000 km/30,000 mi 64 000 km/40,000 mi 72 000 km/45,000 mi 80 000 km/50,000 mi 96 000 km/60,000 mi 112 000 km/70,000 mi 120 000 km/75,000 mi 128 000 km/80,000 mi 144 000 km/90,000 mi 176 000 km/110,000 mi No. Service Interval 160 000 km/100,000 mi 168 000 km/105,000 mi occurs first (1) Brake drum and rotor for or every 19 --I-I--I--I-I-I wear and damage 12 months Brake electric or every 20 I-III-III-III-I vacuum pump 12 months or every 12 months: I 21 Brake fluid I - I R I - I R I - I R I - I or every 12 months: R Hydraulic brake booster or every 22 (HBB) fluid (5500HD ---R---R---R--- 24 months 5500XD models) or every 23 Brake line and hoses - - I - I - - I - - I - I - I 12 months or every 24 Parking brake cable I - I I I - I I I - I I I - I 12 months Automatic transmission or every 25 I-IRI-IRI-IRI-I fluid 12 months Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 333

Service intervals months or kilometers (miles) whichever 16 000 km/10,000 mi 24 000 km/15,000 mi 32 000 km/20,000 mi 48 000 km/30,000 mi 64 000 km/40,000 mi 72 000 km/45,000 mi 80 000 km/50,000 mi 96 000 km/60,000 mi 112 000 km/70,000 mi 120 000 km/75,000 mi 128 000 km/80,000 mi 144 000 km/90,000 mi 176 000 km/110,000 mi No. Service Interval 160 000 km/100,000 mi 168 000 km/105,000 mi occurs first (1) or every 26 Differential gear oil I - I R I - I R I - I R I - I 24 months or every 27 Power steering fluid - - - R - - - R - - - R - - - 24 months or every 28 Power steering oil hoses ------R - - - - - R - - 24 months Steering wheel free 29 Every 10 400 km (6,500 miles): I play (4) or every 30 Steering gear box torque - - T - T - - T - - T - T - - 12 months or every 31 Drive shaft flange torque T - T T T - T T T - T T T - T 12 months or every 32 Drive shaft lubrication L - L L L - L L L - L L L - L 12 months Leaf spring U-bolt 33 T-TTT-TTT-TTT-T torque (4) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

334 Service and Maintenance

Service intervals months or kilometers (miles) whichever 16 000 km/10,000 mi 24 000 km/15,000 mi 32 000 km/20,000 mi 48 000 km/30,000 mi 64 000 km/40,000 mi 72 000 km/45,000 mi 80 000 km/50,000 mi 96 000 km/60,000 mi 112 000 km/70,000 mi 120 000 km/75,000 mi 128 000 km/80,000 mi 144 000 km/90,000 mi 176 000 km/110,000 mi No. Service Interval 160 000 km/100,000 mi 168 000 km/105,000 mi occurs first (1) 34 Wheel nut torque (4) Every 10 400 km (6,500 miles) or every 35 King pin L - L L L - L L L - L L L - L 12 months Wheel hub bearing grease or every 36 ---R---R---R--- - Front (5) 24 months Air conditioner blower 37 Cleaned once a month filter 38 Exhaust injector Cleaned every 176,000 km (110,000 miles) DEF supply pump filter or every 39 Every 192 000 km (120,000 miles): R element 24 months 40 Starter When the starter indicator light (amber) comes on: R 41 Windshield wiper blades Replace every 12 months

Remarks (2) Use of oils other than CK-4 may can be used while it is available.) (1) In case this column is blank, require shorter maintenance Use of oils with other viscosity than follow kilometers (miles). intervals and may cause *W-40 may also require shorter nonconformity to regulations. (CJ-4 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

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maintenance intervals and may Service Interval Maintenance procedure cause a problem with engine durability. Engine Inspect sound absorption materials for Every 16 000 km (10,000 miles) tears, broken out sections or (3) Refer to "Air Cleaner Indicator attachment. Repair or replace as Light" under Engine Air Cleaner/ necessary. Filter 0 253. Cooling System Inspect fan, shroud and radiator for (4) Initial check at 1 040 km Every 16 000 km (10,000 miles) attachment, tears or cleanliness. (650 miles) is required. Replace as necessary. (5) Be sure to discard used grease seal, and always use new grease Air intake system Inspect all ducts, hoses and intake seal for installation. Every 24 000 km (1,500 miles) silencers for leaks or chafing. Repair or replace as necessary. Explanation of Complete Exhaust system Inspect silencer, pipes, gaskets, clamps Vehicle Maintenance Schedule Every 16 000 km (10,000 miles) and mounting for exhaust gas leaks or The following is a brief explanation looseness. Repair or replace as of each of the services listed in the necessary. preceding Complete Vehicle Cab Inspect sound absorption materials for Maintenance Schedule. Every 16 000 km (10,000 miles) tears, broken out sections or 1. Engine Noise : These attachment. Repair or replace as components have an effect on the necessary. control of noise emissions.

2. Valve Lash : Incorrect valve rocker shaft bracket nuts before clearance will result in increased checking and adjusting valve engine noise and lower engine clearance. output, thereby adversely affecting Check and adjust valve clearance engine performance. Retorque every 80 000 km (50,000 miles) or 12 months whichever occurs first. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

336 Service and Maintenance 3. Engine Oil and Oil Filter : 5. Pre-Fuel Filter/Water mounting, and injectors to correct Change at interval noted below separator : Replace the fuel filter torque every 80 000 km depending upon driving conditions. every 24 000 km (15,000 miles) or (50,000 miles). more frequently if clogged or • Normal Service — Change every 10. Rotate Tires : To equalize wear, 16 000 km (10,000 miles) or replace when the fuel filter indicator rotate tires and adjust tire pressures 12 months whichever occurs first. light comes on (if equipped). every 10 400 km (6,500 miles). See 6. Air Cleaner Filter : The level of Tire Rotation 0 307. • Severe Service — Change every 8 000 km (5,000 miles) or 3 months dirt in the air cleaner element can 11. Engine Cooling System : At if you often drive under one or more be checked against the indicator. 12 months or 16 000 km of these conditions: (a) driving in Replace the air cleaner filter when (10,000 miles) intervals, wash dusty areas, (b) frequent idling or the Driver Information Center (DIC) radiator cap and filler neck with idling for long periods, (c) driving shows "CHECK AIR FILTER". clean water, pressure test system 6 km (4 miles) or less in freezing 7. Damage to Air Intake Ducts and and radiator cap for proper pressure weather, or other short trips in cold Hoses : Check for damage of air holding capacity, tighten hose weather, where the engine does not intake ducts and hoses and that clamps and inspect condition of all thoroughly warm up. those are correctly installed every cooling and heater hoses. Replace Change oil and filter as soon as you 24 000 km (15,000 miles) or hoses if cracked, swollen or can after driving in a dust storm. 12 months. Replace or adjust those otherwise deteriorated. Have the When recommended oil is used, it if necessary. hoses replaced by your authorized dealer. conforms to this maintenance 8. Drive Belts : Check belt driving schedule. (Recommended oil: CK-4 the fan, alternator or A/C 12. Engine Coolant : Inspect the (API designations)) compressor every 16 000 km engine coolant every 12 months. 4. Fuel Filter : Replace the fuel (10,000 miles). Look for cracks, Replace the engine coolant every filter every 24 000 km (15,000 miles) fraying, wear, and proper tension. 24 months, drain the engine coolant or more frequently if clogged or by opening the drain plug at the 9. Engine Bolt Torques : Loosened bottom of the radiator core, flush replace when the fuel filter indicator bolts result in lower engine output. light comes on (if equipped). and refill the engine cooling system Check and adjust manifold with a new engine coolant. Refer to "Preparing Engine Coolant" in Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 337 Engine Coolant 0 253. Have the 16. DPF (Pressure Difference When the truck is in motion, the Engine Coolant replaced by your Sensor Hose) : Inspect the sensor sound may be constant or it may authorized dealer. hose every 160 000 km come and go. Pressing the brake 13. Exhaust System : Check the (100,000 miles) or 3,000 hours pedal firmly may cause the sound complete exhaust system every whichever occurs first. Replace the to stop. 16 000 km (10,000 miles). Check sensor hose every 400 000 km Have the brake linings or the brake body areas near the exhaust (250,000 miles). pads replaced by your authorized system. Look for broken, damaged, 17. Fuel Line System : Inspect the dealer as soon as possible after the missing, or out-of-position parts. fuel tank, cap and lines for damage warning first becomes evident. Also inspect for open seams, holes, which could cause leakage every Failure to do so can result in loose connections, or other 16 000 km (10,000 miles). Inspect expensive damage to the brake conditions which could cause heat fuel cap for correct sealing ability system or a serious crash. build-up at the rear body floor pan, and indications of physical damage. 19. Brake Drum and Rotor for or could let exhaust fumes seep into Replace any damaged or Wear and Damage : Check brake the passenger compartment. Dust malfunctioning parts. drums (rear and parking) and rotors or water in the cabin may indicate a 18. Brake Lining and Pad for (front) for wear or damage every leak in that area. Required repairs Wear : Check drum brake lining and 32 000 km (20,000 miles) or should be made at once. disc brake pad for wear or cracks 12 months whichever occurs first. 14. DPF (Clean Filter) : Clean the every 16 000 km (10,000 miles). 20. Brake Electric Vacuum Pump filter every 160 000 km Check brakes (including parking (4500HD, 4500XD models) : (100,000 miles) or 3,000 hours brake) more often if operating Inspect the brake electric vacuum whichever occurs first. conditions or driving habits result in pump operation every 16 000 km 15. DPF (Pressure Difference frequent braking. (10,000 miles) or 12 months, Sensor 0 Point Adjustment) : Front disc brakes have built-in wear whichever occurs first. Adjust the sensor every 160 000 km noise indicators which are designed (100,000 miles) or 3,000 hours to make a high pitched squeal or whichever occurs first. cricket-like warning sound when the brake pads are worn to the point where new pads are needed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

338 Service and Maintenance 21. Brake Fluid : Check the fluid in engine oil change and replace fluid 30. Steering Gear Box Torque : the brake fluid reservoir every every 48 000 km (30,000 miles). Do Retighten the attaching bolts of the 16 000 km (10,000 miles). Replace not overfill. steering gear box to the specified the fluid every 48 000 km 26. Differential Gear Oil : Replace torque every 12 months or every (30,000 miles). lubricant every 48 000 km 32 000 km (20,000 miles) whichever 22. Hydraulic Brake Booster Fluid (30,000 miles). Check lubricant level occurs first. (5500HD, 5500XD models) : every 16,000 km (10,000 miles) or Steering gear box tightening Replace Dexron VI ATF fluid every every 12 months, and add lubricant torque 24 months or 30,000 miles to within 0 to 10 mm (0 to 0.4 inch) 103 Y (76 lb·ft) (48,000 km), whichever occurs first. of the bottom edge of the filler hole 23. Brake Line and Hoses : Check if necessary. 31. Driveshaft Flange Torque : lines and hoses for proper hook-up, 27. Power Steering Fluid : Check the fixing bolts of driveshaft binding, leaks, cracks, chafing, etc. Replace power steering fluid every flange for looseness or damage every 32 000 km (20,000 miles). 24 months or 48 000 km after the first 16 000 km Any questionable parts should be (30,000 miles), whichever occurs (10,000 miles). replaced or repaired at once. When first. Driveshaft flange tightening torque rubbing or wear is noted on lines or 28. Power Steering Oil Hoses : 103 Y (76 lb·ft) hoses, the cause must be corrected Replace power steering oil hoses at once. every 24 months or 80 000 km 32. Driveshaft Lubrication : 24. Parking Brake Cable : Check (50,000 miles), whichever occurs Lubricate the grease fitting on the the parking brake cable every first. center bearing, as well as each 16 000 km (10,000 miles) or 29. Steering Wheel Free Play : universal joint and spline coupling 12 months whichever occurs first. Check steering wheel free play after every 12 months or 16 000 km 25. Automatic Transmission the first 1 040 km (650 miles) and (10,000 miles) whichever occurs Fluid : Check the automatic then every 10 400 km (6,500 miles). first. transmission fluid level at each Steering wheel free play 10-50 mm (0.39-1.97 in) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 339

33. Leaf Spring U-bolt Torque : Wheel nut tightening torque 40. Starter : The color displayed by Tighten the U-Bolt nuts to the the starter indicator light will change specified torque after the first 500 Y (362 lb·ft) from green to amber when the 1 040 km (650 miles), thereafter number of times remaining is 0 or every 16 000 km (10,000 miles). 35. King Pin : Lubricate the grease below and the screen is selected. fitting on the king pins every Model Leaf spring U-bolt nut When the indicator light (amber) 12 months or 16 000 km tightening torque comes on, have the vehicle (10,000 miles) whichever occurs inspected/serviced at the nearest Front Rear first. dealer. 4500HD 127 Y 177 Y 36. Wheel Hub Bearing Grease : 41. Wiper Blades : Inspect wiper (94 lb·ft) (131 lb·ft) Clean and repack front wheel blades for wear, cracking, bearings every 24 months or 4500XD 196 Y 177 Y or contamination. Clean the 48 000 km (30,000 miles) whichever (145lb·ft) (131 lb·ft) windshield and wiper blades, occurs first. if contaminated, replace wiper 5500HD, 196 Y 284 Y 37. Air Conditioner Blower 5500XD (145lb·ft) (209 lb·ft) blades that are worn or damaged, Filter : The air conditioner blower or at least once a year. See Wiper filter should be removed and Blade Replacement 0 275. 34. Wheel Nut Torque : Check tires cleaned once a month. for excessive or abnormal wear, or damage. Also check tire inflation 38. Exhaust Injector : Clean the pressures and adjust. exhaust injector every 176,000 km (110,000 miles). Be sure wheels are not bent or cracked and that wheel nuts have 39. DEF Supply Pump Filter been tightened to the specified Element : Replace the DEF supply torque after the first 1,040 km pump filter element every (650 miles) and then every 192 000 km (120,000 miles) or 10 400 km (6,500 miles). Note that 24 months whichever occurs first. there are left and right hand threads. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

340 Service and Maintenance Owner Checks and seat belt. The passengers are also Checking Condition of the Engine required to buckle up the seat belts. at Low Speeds and during Services Adjust the positions of the steering Acceleration wheel and mirrors. Lock the doors. Before Driving 1. Make sure the transmission is Turn the power of the dome light or in the "P" or "N" position and Proper care and driving is important accessories OFF before starting the the parking brake is securely not only for extended service life of engine. engaged. your vehicle, but also for improved Engine Conditions fuel and oil economy. Drive carefully 2. Turn the engine control switch and defensively. Be sure you know Checking the Engine for to start the engine, and run it to how to use your truck and its Startability and Abnormal Noises warm up. equipment before operating it. 1. Make sure the parking brake is 3. Check that the engine is running at a speed within the Starting and Operating securely engaged. Step firmly on the brake pedal. standard idle speed range. Proper care and operation will not During regeneration of the only extend the service life of your 2. Make sure the selector lever is in "P" or "N" position. diesel particulate filter (DPF), vehicle but also improve fuel the engine idle speed may economy. For safety, firmly press the increase. Check Around the Vehicle Before brake pedal before starting the engine. 4. Drive the vehicle, making sure Starting the Engine the accelerator pedal does not Before pulling away, perform a 3. Turn the engine control switch stick when gradually thorough safety check, making sure to start the engine. accelerating, the engine speed there are no children or obstructions Check that the engine starts rises smoothly and it does not around the vehicle. quickly with no abnormal knock. Take off the chocks after confirming noises. that the parking brake is securely applied. Sit behind the wheel, adjust the seat position, and buckle up the Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 341 Recommended Daily 2. Checks performed at the . Steering wheel position and (Pre-operation) Inspections engine free play These checks are in addition to, not . Fan belt looseness and . Operation of horn and turn instead of, any legally required daily damage signal lights inspections. See related topics . Engine oil level . Door lock operation under "Maintenance Schedule", especially if problems are found. . Engine coolant level 4. Checks performed during a walk around the vehicle For safe and comfortable driving, . Power steering fluid level keep record of the distances driven 3. Checks performed from the . Illumination, flashing, and the condition of the vehicle driver's seat contamination, damage and during operation. Perform obstruction of lights . Brake fluid level inspections at appropriate intervals, . Contamination, damage ad and perform maintenance in . Brake pedal free play obstruction of windows, accordance with the findings of the . Operation of meters, mirrors and reflectors inspections. If an inspection reveals gauges and warning/ . Leaf spring damage an abnormality or there was an indicator lights abnormality the previous time the . Oil, engine coolant, fuel, vehicle was driven, have the vehicle . Engine startability, brake fluid and power repaired by the nearest dealer abnormal noise and color of steering fluid leaks exhaust gases before it is driven again. . Water separator . Parking brake lever stroke 1. Components that showed 5. Checking wheels and tires abnormalities during the . Windshield washer fluid previous operation spray condition and . Air pressure . Check components that windshield wiper . Cracks and other damage showed abnormalities effectiveness . Abnormal wear during the previous . Windshield washer fluid . Tread depth operation level Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

342 Service and Maintenance . Mounting condition of all Electrical System wheel nuts Warning (Continued) Following the after-delivery service, 6. Checks performed after the For proper pedal operation, it is it is the owner's responsibility to engine startup also essential to lay floor mats check all wiring periodically for . Oil, engine coolant, fuel, properly. Incorrectly installed floor cracked, chafed or oil-soaked brake fluid and power mats would hinder free movement insulation and maintain it in a clean steering fluid leaks of the pedals. and tight condition to ensure satisfactory operation of the . Inspect the exhaust system, Do not use the dashboard pocket electrical system. checking that the tailpipe is or the top of the dashboard as a clear place to put items that could roll, Headlights and Turn Signal 7. Checks performed while driving which could interfere with your Lights the vehicle driving. You and others could be Turn the engine control switch to the seriously injured. . Brake effectiveness "ON" position, and then check the way in which the headlights, turn . Engine abnormal noises Choose Your Footwear Suitable signal lights, and other exterior Keep the Floor Around the Driver for Driving lights come on and flash. In Seat Clean and Tidy addition, press the brake pedal to confirm whether the stop lights { Warning come on, and shift the transmission { Warning Choose footwear that ensures to "R" position to confirm whether the back up lights come on. Also It is extremely dangerous to have proper operation of pedals when examine the lights for discoloration, empty cans, empty bottles, driving the vehicle. Use of damage, and looseness. or other items rolling around on footwear unsuitable for driving the floor because they could get may cause an accident. The trapped under the brake pedal driver could be seriously injured and prevent brake application. when not wearing the proper (Continued) footwear. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 343 Greasing Chassis Components The type (characteristics) of the grease specified for use with a chassis component differs from that of the grease specified for use with another component. Be sure to use only the specified grease for each component and perform greasing according to the Maintenance Schedule.

Front Rear

1. Roofmarker Lamp 1. Rear Turn Signal Lamp (Identification/ 2. Back-up Lamp Clearance Lamp) 3. License Plate Lamp 2. Front Turn Signal Lamp 4. Taillamp/Stoplamp 3. Side Turn Signal Lamp/ Sidemarker Lamp Lubrication 4. Cornering Lamp One of the most important items of 5. Side Reflector good vehicle care is the lubrication 6. Headlamp/Parking Lamp of all necessary points with the Right Lubricant, at the Right Time King pins (left and right) and in the Right Way. It is the owner's responsibility to maintain proper lubrication practices as recommended in the following pages. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

344 Service and Maintenance

Driveshaft splines (4500/5500)

Driveshaft universal joint (Single-piece shaft)

Center bearing (4500/5500) Driveshaft universal joint (Two-piece shaft) Single-piece driveshaft: 2 points; Two-piece driveshaft: 3 points Each driveshaft universal joint must be greased heavily until grease oozes at the 4 needle bearing oil seal locations. After greasing, wipe off excess grease. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 345 Lubrication Chart Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

346 Service and Maintenance Additional A: Parking Brake : Park on a fairly to turn or has too much free play, steep hill and hold the vehicle with or when there are strange sounds Maintenance and Care the parking brake only. This checks when turning or parking. holding ability. Owner Safety and Routine E: Wheel Alignment, Balance, and Maintenance Before checking item (B) below, be Tires : Check tires for abnormal sure to have enough room around wear or damage. Also, check for Listed below are vehicle checks the vehicle. Then firmly apply both damaged wheels. A pull right or left which should be made periodically the parking brake see Parking on a straight and level road may by either the owner or a qualified Brake 0 220 and the regular brakes. show the need for a wheel technician to ensure proper Do not use the accelerator pedal. alignment. A vibration of the performance and safety of your If the engine starts, be ready to turn steering wheel or seat at normal vehicle. Take any problems promptly off the engine control switch at highway speeds may mean a wheel to a technician for service advice. once. Take these precautions balancing is needed. Check tire For your safety and that of others, because the vehicle could move pressure when the tires are "cold," any of the safety-related without warning and possibly cause at least monthly, and whenever the components that may have been injury or property damage. vehicle is serviced. damaged in a crash should be B: Starter Safety Switch : Check Check the pressure more often if checked and necessary repairs by trying to start the engine in each daily checks show it's needed. performed before operating your gear. The starter should crank only (Refer to "Recommended Daily vehicle. at selector position "P" or "N". (Pre-operation) Inspections" under 0 At the minimum, these routine C: Transmission Shift Indicator : Owner Checks and Services 340). checks should be made every Check that the indicator points to Change tire pressure as needed 6 months or 16,000 km the gear chosen. when changing loads. (10,000 miles), whichever comes F: Brakes : Be alert to illumination first. Whenever repairs are D: Steering : Be alert for any changes in steering action. An of the brake system warning light or necessary, have them completed brake low vacuum warning light before operating the vehicle. inspection or service is needed when: the steering wheel is harder (4500HD, 4500XD models) or the tone alarm, or changes in braking action, such as repeated pulling to Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 347 one side, unusual sounds when I: Defroster : Turn the outlet mirrors, headlamps, parking lamps, braking, increased brake pedal selector knob to "Defroster" and the identification and clearance lamps, travel or harder pedal. The front and fan speed control knob to the fully taillights, brake lamps, turn signals, rear brakes are attached to an auto clockwise position. Then check the cornering lamps, backup lamps and adjuster mechanism. If there are no airflow from the ducts at the inside hazard warning flashers. Have defects, as the pedal travel is base of the windshield. headlamp aim checked immediately properly maintained, adjustments J: Rearview Mirrors and Sun if beams seem improperly aimed. are not necessary. Check regularly Visors : Check that friction joints O: Glass, Mirrors, Lights and/or that the brake fluid reservoir hold mirrors and sun visors in place. Reflectors Condition : Look for (left-hand side of the instrument broken, scratched, dirty or damaged panel) or HBB reservoir (5500HD, K: Horn : Sound the horn, now and then, to be sure it works. glass, mirrors, lamps or reflectors 5500XD models: left side behind the that could reduce the view or cab) is properly filled and check for L: Lap-Shoulder Belts : Check the visibility, or cause injury. Replace, fluid leaks. Any of these conditions seat belt system (including webbing, clean or repair promptly. could indicate the need for brake buckles, latch plates and anchors) system inspection and/or service. for proper operation, and for P: Door Latches : Check that doors damage. close, latch and lock tightly. Check G: Exhaust System : Be alert for for broken, damaged or missing any changes in the sound of the M: Seat Adjusters : When parts that might prevent tight exhaust system or any smell of adjusting the driver's manual seat, latching. fumes. These are signs the system be sure the seat adjusters latch by may be leaking. Have it checked pushing the seat forward and Q :Tilt Cab (Driving Position) : Be and/or repaired at once. (Refer to backward. Do not attempt to adjust sure the tilt lever is down and "Engine Exhaust Emissions Caution the seat when the vehicle is in locked. (Carbon Monoxide)" under Engine motion. R: Fluid Leaks : Check for fuel, Exhaust 0 177). N: Lamps : Check panel lighting, water, oil or other fluid leaks by H: Windshield Wipers and warning lamps, indicator lamps and looking at the surface beneath the Washers : Check operation and interior lamps. On the outside, vehicle after it has been parked for condition of the wiper blades. Check check: license plate lamps, side the flow of the washer spray. marker lamps, reflectors on outside Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

348 Service and Maintenance a while. If you notice diesel fumes or Checking Components that fluid at any time, have the cause Showed Abnormalities during found and corrected at once. Previous Operation S: Underbody : Corrosive materials Check the components that showed used for ice removal, snow removal abnormalities during the previous and dust control can collect on the operation. Have any abnormalities underbody. If these materials are repaired by your dealer before using not removed, accelerated corrosion the vehicle. (rust) can occur on underbody parts such as fuel lines, frame, floor pan and exhaust system. At least every spring, flush these materials from the underbody with plain water. Take care to clean well any areas where mud and other debris can collect. Sediment packed in closed areas of the frame should be loosened before being flushed. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 349 Recommended Fluids, Lubricants, and Parts Recommended Fluids and Lubricants Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer. Usage Fluid/Lubricant Automatic Transmission Automatic Transmission Fluid (GM Part No. 19354076). Battery Terminals Petroleum Jelly (outer surfaces) Brake Fluid DOT 3 Hydraulic Brake Fluid (GM Part No. 19353126). Cab-Door Hinges and Latches Multi-Purpose Lubricant, Superlube (GM Part No. 12346241) or equivalent Lubricant containing oxide. Chassis Lubricant Chassis Lubricant (GM Part No. 12377985) or high temperature equivalent. Diesel Exhaust Fluid (DEF) Diesel Exhaust Fluid (GM Part No. 19353126) or diesel exhaust fluid that meets ISO 22241-1 or displays the API Diesel Exhaust Fluid Certification Mark. Driveshaft Center Bearing, Wheel NLGI #2 or #3 Hub Bearing Lubricant Driveshaft, Universal Joints and NLGI #1 or #2 multi-purpose type grease Sliding Sleeve Lubricant Engine Coolant 50/50 mixture of clean, drinkable water and GM extended life coolant. (GM Part No. 12378560) See Engine Coolant 0 253. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

350 Service and Maintenance

Usage Fluid/Lubricant Engine Oil Engine oils with the letters CK-4 are required for your vehicle. The CK-4 designation can appear either alone or in combination with other American Petroleum Institute (API) designations, such as API CK-4/SL. These letters show API levels of quality. To determine the preferred viscosity for your vehicle's diesel engine, see Engine Oil 0 245. Hydraulic Brake Booster (If DEXRON®-VI Automatic Transmission Fluid. Equipped) Power Steerig Fluid DEXRON®-VI Automatic Transmission Fluid. Rear Axle Multi purpose gear oil SAE80W-90 GL-5, SAE90 GL-5 Rear Axle Multi purpose gear oil SAE80W-90 GL-5, SAE90 GL-5 for limited slip (Limited slip differential (LSD)) differential together with limited slip differential lubricant additive (GM Part No. 88900330) or equivalent. Windshield Washer Solvent Automotive windshield washer fluid that meets regional freeze protection requirements. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Service and Maintenance 351 Be sure to use the LSD gear oil Maintenance additive mentioned above in vehicles equipped with limited slip Replacement Parts differentials, and ensure there is an Replacement Parts appropriate amount of the LSD gear oil additive, otherwise a chattering Please contact your dealer for noise and/or excessive vibration genuine GM parts. may occur when turning. If abnormal noises occur despite { Warning having used the specified LSD gear If part replacement is necessary, oil additive, have it inspected and the part must be replaced with serviced at your dealer. one of the same part number or with an equivalent part. Use of a replacement part of lesser quality may result in personal injury or damage to the vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

352 Service and Maintenance 5.2L Diesel Part GM Part Number Engine Air Cleaner 97780479 Engine Oil Filter 98298404 Fuel Filter: Engine Side 98147525 Fuel Filter: Chassis Side 98037481

Replacement Fasteners { Warning During vehicle maintenance, any fasteners used to replace older This vehicle is primarily ones must have the same dimensioned in the metric system. measurements and strength as Most fasteners are metric and those removed, whether metric or many are very close in dimension customary. Fasteners taken from to well-known customary the vehicle should be saved for fasteners in the inch system. reuse in the same location when Mismatched or incorrect fasteners possible. Where a fastener cannot can result in damage to the be used again, take care to choose vehicle or possibly personal a replacement that matches the old injury. one. For information and help, see your dealer. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Technical Data 353 Technical Data Vehicle Identification VIN and Weight Rating Plate Vehicle Identification Vehicle Identification Number (VIN) Vehicle Identification Number (VIN) ...... 353 The VIN and engine number are necessary for registering your Vehicle Data vehicle. They are also necessary Capacities and when your vehicle undergoes official Specifications ...... 357 inspections. Provide your dealer Engine Drive Belt Routing . . . . 363 with these numbers when you are having the vehicle repaired or when ordering replacement parts. The Dealer will be able to do the requested jobs more competently and quickly. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

354 Technical Data ratings (GAWRs), as well as the VIN and emissions information for your vehicle. This plate is located on the left side rear pillar panel below the striker (single cab) or on the left center pillar panel beside the shoulder seat belt anchor (crew cab). The VIN is a legal identifier of your vehicle. It not only appears on the VIN, Weight Rating, and Greenhouse Gas (GHG) Emissions plate; but also on the vehicle title and registration. The VIN specifically identifies a vehicle by code. See “Overloading” under Information on Loading the Vehicle 0 58. The VIN contains multiple pieces of information including the vehicle and engine model codes as shown below.

The "VIN, Weight Rating, and Greenhouse Gas (GHG) Emissions Plate" shows the manufacturer's gross vehicle weight rating (GVWR), the front and rear gross axle weight Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Technical Data 355

JALC4W16*K7K00001 1 2 3 4 5 6 7 8 9 10 11

Section Description 1 World Manufacturer Identifier (WMI) JAL: ISUZU 2 GVWR and Brake System C: 14,001-16,000 lbs. hydraulic brake system E: 16,001-19,500 lbs. hydraulic brake system 3 Series Code 4: 4500HD/4500XD 5: 5500HD/5500XD 4 Cab Type Code W: Steel tilt single cab, 71 inch bumper to back of cab (BBC) J: Non-tilt crew cab, 110 inch bumper to back of cab (BBC) 5 Chassis Type Code 1: 4 x 2 6 Engine Code 6: 4HK1 7 Check Digit 8 Model Year Code K: 2019 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

356 Technical Data

Section Description 9 Plant Code 7: Fujisawa 10 Model Code 0: 4500HD 3: 5500XD 9: 5500HD K: 4500XD 11 Sequence Numbers

Interpretation of the VIN may differ depending on the vehicle. For further details, please ask your dealer.

The engine number is stamped on the right side front part of the engine block. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Technical Data 357 Vehicle Data Capacities and Specifications These specifications are given here for information only. Before using them, see the Cautions and other instructions throughout this manual – the index may help you locate such items. For more information, see the Service Manual covering the chassis or body part in question. Your dealer may also be able to help. Engine Specifications Description Water-cooled, overhead , direct injection engine with a charge air cooled turbocharger. Manufacturer Isuzu Model 4HK1 – 5.2L Diesel Engine Engine type Inline 4, Four Cycle Induction Turbocharged W/Charge Air Cooler 115 mm Stroke 125 mm Displacement 5.193 L (317 CID) Full load RPM 2,400 rpm 16.5 to 1 Firing order 1-3-4-2 Fuel injection timing 0° (static) degree Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

358 Technical Data

Valve clearance Both intake and exhaust valves: 0.6 mm (0.024 in) in cold engine Idling speed 550–600 r/min Fan belt tension New belt: 5–7 mm (0.20–0.28 in)/184–206 Hz When used: 8–9 mm (0.31–0.35 in)/158–170 Hz Oil filter Cartridge (spin on) type Engine oil capacity When changing oil and filter: 11.0 L (11.6 qt) *1 Engine coolant capacity 19.6 L (20.7 qt) *2 Preheating system Glow plugs Transmission Specifications A465 Model – Six-speed automatic transmission (overdrive gear for 5th and 6th), lock-up clutch for 2nd to 6th Gear Ratio 1st 3.742 to 1 2nd 2.003 to 1 3rd 1.343 to 1 4th 1.000 to 1 5th 0.773 to 1 6th 0.634 to 1 Reverse 3.539 to 1 Transmission oil capacity 13.1 L (27.7 pt) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Technical Data 359

Service Specifications Weights Axle weight rating : Front 4500HD: 2431 kg (5,360 lb) 4500XD: 3007 kg (6,630 lb) 5500HD: 3098 kg (6,830 lb) 5500XD: 3300 kg (7,275 lb) Engine Oil Engine oil capacity When changing oil and filter: 11.0 L (11.6 qt) *1 Engine Cooling System Capacity 19.6 L (20.7 qt) Engine oil Thermostat: 82–85 °C (180–185 °F) Starts to open Radiator pressure 108 kPa (16 psi) Transmission Transmission oil capacity 13.1 L (27.7 pt) *3 Rear Axle Differential gear oil 4500HD/4500XD: capacity 9.0 L (19.0 pt) *4 5500HD/5500XD: 10.0 L (21.1 pt) *4 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

360 Technical Data

Limited slip differential 4500HD/4500XD: lubricant additive 0.5 L (1.06 pt) *5 5500HD/5500XD: 0.6 L (1.27 pt) *5 Fuel Fuel tank capacity *6 113 L (30.0 gal) 125 L (33.0 gal) Diesel Exhaust Fluid (DEF) DEF tank capacity 16.0 L (4.23 gal) Steering Steering wheel free play 10–50 mm (0.39–1.97 in) Power steering fluid capacity 1.5 L (1.6 qt) Wheel Wheel alignment Toe-in –2 to 2 mm (–0.08 to 0.08 in) Camber 0°15’ Caster LH 2°50’, RH 3°40’ King pin 12° Wheel hub bearing grease capacity 0.11 kg (0.24 lb) Wheel stud nut torque : Front and rear 500 Y (50 kgf m/362 lb ft) Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Technical Data 361

Disc Brakes Model 4500HD 4500XD/5500HD/5500XD Brake size (Diameter x φ293 x 40 mm (φ11.54 x 1.57 in) φ363 x 42 mm (φ14.29 x 1.65 in) Thickness) Rotor thickness [Standard Value] 40.0 mm (1.575 in) 42.0 mm (1.654 in) [Usable Limit] 37.0 mm (1.457 in) 39.0 mm (1.535 in) Pad thickness [Standard Value] 13.0 mm (0.512 in) 13.0 mm (0.512 in) [Usable Limit] 1.0 mm (0.04 in) 1.0 mm (0.04 in) Service Brakes Brake pedal free play 4500HD/4500XD 5–10 mm (0.20–0.39 in) 5500HD/5500XD 5–10 mm (0.20–0.39 in) Clearance between the brake pedal and the brake pedal bracket with a pressure of 490 Y (50 kgf/110 lb ft) applied to the brake pedal 4500HD/4500XD models 35 mm (1.38 in) or more Clearance between the brake pedal and the brake pedal bracket with a pressure of 294 Y (30 kgf/66 lb ft) applied to the brake pedal 5500HD/5500XD models 35 mm (1.38 in) or more Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

362 Technical Data

Parking Brake Lever effective stroke 6–8 notches (Under pull force of approx. 147 N (15 kg/33 lb) Electrical System Battery type [BCI size] 31T (160–750) x 2 *7 (RC-CCA) x No. of units Starter 12 V/3.0 kw Alternator 12 V/140 amp Tightening Torque Oil pan drain plug 83.3 Y (8.5 kgf m/61.0 lb ft) Oil filter drain plug — Oil filter — Oil filter cartridge 63.7 Y (6.5 kgf m/47.0 lb ft) Remarks: *1 see Engine Oil 0 245. Remarks: *2 see Engine Coolant 0 253. Remarks: *3 see Automatic Transmission Fluid 0 251. Remarks: *4 see Rear Axle (Gear Oil Viscosity Chart) 0 271 or Rear Axle (Oil Level Check) 0 272. Remarks: *5 only for vehicles equipped with optional limited slip differential. Remarks: *6 The fuel tank capacity is stated on a metal plate attached to the fuel tank body. Only fill the tank to 95 percent of its capacity; this allows room for the expansion of the fuel. Remarks: *7 larger capacity batteries 31 (180-930) × 2 can also be used. However, do not mix batteries of different types and from different makers. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Technical Data 363

Engine Drive Belt Routing No. Name . The air conditioning drive belt, if equipped, must be adjusted Fan Belt and Air Conditioning 7 Alternator after fan belt adjustment. If the Compressor Belt belt is not adjusted properly, the If your air conditioning system is A/C belt may experience See the Maintenance Schedule functioning properly, it is not excessive tension, and possible 0 327. necessary to remove and replace premature failure. the refrigerant or compressor oil. . A V-ribbed belt is used for the fan belt. This type of belt requires the tension to be adjusted more accurately than is required with the conventional V belt. Inappropriate tension could cause the belt to make noise or break. When the fan belt is damaged, electricity is not properly generated or becomes a cause of engine overheating. You must check the tension of No. Name the fan belt carefully. 1 Fan belt . Use dealer-certified genuine parts when changing the 2 Fan pulley fan belt. 3 A/C belt . Have the vehicle inspected and 4 A/C compressor serviced at your dealer. 5 Tension pulley 6 Crank pulley Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

364 Customer Information Reporting Safety Defects to Customer Information Customer General Motors ...... 371 Information Vehicle Data Recording and Customer Satisfaction Privacy Procedure Customer Information Vehicle Data Recording and Privacy ...... 372 Your satisfaction and goodwill are Customer Satisfaction important to your dealer and to Procedure ...... 364 Chevrolet. Normally, any concerns Customer Assistance with the sales transaction or the Offices ...... 365 operation of the Chevrolet chassis, Customer Assistance for Text or upfitted rear body will be resolved Telephone (TTY) Users . . . . . 365 by your dealer's sales or service Online Owner Center ...... 365 departments. Sometimes, however, GM Mobility Reimbursement despite the best intentions of all Program ...... 366 concerned, misunderstandings can Roadside Assistance occur. If your concern has not been Program ...... 367 resolved to your satisfaction, the Scheduling Service following steps should be taken: Appointments ...... 367 Collision Damage Repair . . . . . 368 STEP ONE : Discuss your concern Publication Ordering with a member of dealership Information ...... 370 management. Normally, concerns Radio Frequency can be quickly resolved at that level. Statement ...... 370 If the matter has already been reviewed with the sales, service, Reporting Safety Defects or parts manager, contact the owner Reporting Safety Defects to of your dealership or the general the United States manager. Government ...... 371 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Customer Information 365 STEP TWO : If after contacting a When contacting Chevrolet, Customer Assistance for member of dealership management, remember that your concern will it appears your concern cannot be likely be resolved at a dealer's Text Telephone (TTY) resolved by your dealership without facility. That is why we suggest Users further help call the Chevrolet following Step One first. To assist customers who are deaf, Customer Assistance Center at hard of hearing, or speech-impaired 1-800-862-4389. Customer Assistance and who use Text Telephones We encourage you to call the Offices (TTYs), Chevrolet has TTY toll-free number in order to give your equipment available at its Customer Chevrolet encourages customers to inquiry prompt attention. Have the Assistance Center. Any TTY user in call the toll-free number for following information available to the U.S. can communicate with assistance. However, if a customer give the Customer Assistance Chevrolet by dialing: wishes to write or e-mail Chevrolet, representative: 1-800-833-2438. the letter should be addressed to: . Your name, address, and daytime phone number. United States Online Owner Center . Vehicle Identification Chevrolet Motor Division Online Owner Experience Number (VIN). This is available Chevrolet Customer Assistance (U.S.) www.my.chevrolet.com from the vehicle registration or Center The Chevrolet online owner title, and on the VIN plate or the P.O. Box 33170 experience allows interaction with Vehicle Certification and Detroit, MI 48232-5170 Chevrolet and keeps important Greenhouse Gas (GHG) www.Chevrolet.com vehicle-specific information in one Emissions Plate in the cab of the 1-800-862-4389 place. vehicle. 1-800-833-2438 (For Text . Dealership name and location. Telephone Devices (TTYs)) Membership Benefits Roadside Assistance: E : Download owner’s manuals . Vehicle delivery date and 1-888-899-1327 present mileage. and view vehicle-specific how-to videos. . Nature of the problem. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

366 Customer Information G : View maintenance schedules, Chevrolet Owner Centre GM Mobility alerts, and Vehicle Diagnostic (Canada) Reimbursement Program Information. Schedule service www.chevroletowner.ca appointments. Visit the Chevrolet Owner Centre: I : View and print dealer-recorded . Chat live with online help service records and self-recorded representatives. service records. . Locate owner resources such as D : Select a preferred dealer and lease-end, financing, and view locations, maps, phone warranty information. numbers, and hours. This program is available to . Retrieve your favorite articles, r : Track your vehicle s warranty qualified applicants for cost ’ quizzes, tips, and multimedia information. reimbursement of eligible galleries organized into the aftermarket adaptive equipment J : View active recalls by Vehicle Featured Articles and Auto Care required for the vehicle, such as Identification Number (VIN). See Sections. hand controls or a wheelchair/ Vehicle Identification Number (VIN) . Download owner s manuals. scooter lift for the vehicle. 0 353. ’ . Find the For more information on the limited H : View GM Card, SiriusXM Chevrolet-recommended offer, visit www.gmmobility.com or Satellite radio (if equipped), and maintenance services. call the GM Mobility Assistance OnStar account information (if Center at 1-800-323-9935. Text equipped). Telephone (TTY) users, call F : Chat with online help 1-800-833-9935. representatives. See www.my.chevrolet.com to register your vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Customer Information 367 Roadside Assistance Coverage driven. Assistance is not given when the vehicle is stuck in the Services are provided for the Program sand, mud, or snow. duration of the vehicle s powertrain Call 1-888-899-1327. (Text ’ warranty. Telephone (TTY): 1-888-889-2438.) Services Not Included in Anyone driving the vehicle is Roadside Assistance Service is available 24 hours a day, covered. 365 days a year. . Impound towing caused by Roadside Assistance is not a part of violation of any laws. Calling for Assistance the New Vehicle Limited Warranty. . Legal fines. When calling Roadside Assistance, General Motors North America and . Mounting, dismounting, have the following information Chevrolet reserve the right to make or changing of snow tires, ready: any changes or discontinue the Roadside Assistance program at chains, or other traction devices. . Your name, home address, and any time without notification. Service is not provided if a vehicle home telephone number. General Motors North America and is in an area that is not accessible . Telephone number of your Chevrolet reserve the right to limit to the service vehicle or is not a location. services or payment to an owner or regularly traveled or maintained . Location of the vehicle. driver if they decide the claims are public road, which includes ice and made too often, or the same type of winter roads. Off-road use is not . Model, year, color, and license claim is made many times. covered. plate number of the vehicle. . Odometer reading, Vehicle Services Provided Scheduling Service Identification Number (VIN), and . Emergency Tow from a Public Appointments delivery date of the vehicle. Road or Highway: Tow to the When the vehicle requires warranty nearest Chevrolet dealer for . Description of the problem. service, contact your dealer and warranty service, or if the vehicle request an appointment. By was in a crash and cannot be scheduling a service appointment and advising the service consultant Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

368 Customer Information of your transportation needs, your Collision Parts Aftermarket collision parts are also dealer can help minimize your available. These are made by Genuine GM Collision parts are new inconvenience. companies other than GM and may parts made with the same materials not have been tested for the vehicle. If the vehicle cannot be scheduled and construction methods as the As a result, these parts may fit into the service department parts with which the vehicle was poorly, exhibit premature durability/ immediately, keep driving it until it originally built. Genuine GM corrosion problems, and may not can be scheduled for service, Collision parts are the best choice to perform properly in subsequent unless, of course, the problem is ensure that the vehicle's designed collisions. Aftermarket parts are not safety related. If it is, please call appearance, durability, and safety covered by the GM New Vehicle your dealership, let them know this, are preserved. The use of Genuine Limited Warranty, and any vehicle and ask for instructions. GM parts can help maintain the GM failure related to such parts is not New Vehicle Limited Warranty. If your dealer requests you to bring covered by that warranty. the vehicle for service, you are Recycled original equipment parts urged to do so as early in the work may also be used for repair. These Repair Facility day as possible to allow for parts are typically removed from GM also recommends that you same-day repair. vehicles that were total losses in choose a collision repair facility that prior crashes. In most cases, the meets your needs before you ever Collision Damage Repair parts being recycled are from need collision repairs. Your dealer undamaged sections of the vehicle. If the vehicle is involved in a may have a collision repair center A recycled original equipment GM collision and it is damaged, have the with GM-trained technicians and part may be an acceptable choice to damage repaired by a qualified state-of-the-art equipment, or be maintain the vehicle's originally technician using the proper able to recommend a collision repair designed appearance and safety equipment and quality replacement center that has GM-trained performance; however, the history of parts. Poorly performed collision technicians and comparable these parts is not known. Such parts repairs diminish the vehicle resale equipment. are not covered by the GM New value, and safety performance can Vehicle Limited Warranty, and any be compromised in subsequent related failures are not covered by collisions. that warranty. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Customer Information 369 Insuring the Vehicle parts. Read the lease carefully, as . Vehicle make, model, and you may be charged at the end of model year. Protect your investment in the GM the lease for poor quality repairs. vehicle with comprehensive and . Vehicle Identification collision insurance coverage. There If a Crash Occurs Number (VIN). are significant differences in the If there has been an injury, call . Insurance company and policy quality of coverage afforded by number. various insurance policy terms. emergency services for help. Do not Many insurance policies provide leave the scene of a crash until all . General description of the reduced protection to the GM matters have been taken care of. damage to the other vehicle. vehicle by limiting compensation for Move the vehicle only if its position puts you in danger, or you are Choose a reputable repair facility damage repairs through the use of that uses quality replacement parts. aftermarket collision parts. Some instructed to move it by a police officer. See “Collision Parts” earlier in this insurance companies will not section. specify aftermarket collision parts. Give only the necessary information When purchasing insurance, we to police and other parties involved Managing the Vehicle Damage recommend that you ensure that the in the crash. Repair Process vehicle will be repaired with GM For emergency towing see In the event that the vehicle requires original equipment collision parts. Roadside Assistance Program damage repairs, GM recommends If such insurance coverage is not 0 367. that you take an active role in its available from your current repair. If you have a pre-determined Gather the following information: insurance carrier, consider switching repair facility of choice, take the to another insurance carrier. . Driver name, address, and vehicle there, or have it towed there. If the vehicle is leased, the leasing telephone number. Specify to the facility that any company may require you to have . Driver license number. required replacement collision parts insurance that ensures repairs with be original equipment parts, either Genuine GM Original Equipment . Owner name, address, and new Genuine GM parts or recycled Manufacturer (OEM) parts or telephone number. original GM parts. Remember, Genuine Manufacturer replacement . Vehicle license plate number. recycled parts will not be covered by the GM vehicle warranty. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

370 Customer Information Insurance pays the bill for the repair, Publication Ordering Current and Past Models but you must live with the repair. Service manuals and customer Depending on your policy limits, Information literature are available for many your insurance company may Service Manuals current and past model year GM initially value the repair using vehicles. aftermarket parts. Discuss this with Service manuals have the diagnosis the repair professional, and insist on and repair information on the To order, call 1-800-551-4123 Genuine GM parts. Remember, engine, transmission, axle, Monday–Friday, 8:00 a.m.–6:00 p.m. if the vehicle is leased, you may be suspension, brakes, electrical eastern time system, steering system, body, etc. obligated to have the vehicle For credit card orders only (VISA, repaired with Genuine GM parts, Customer Literature MasterCard, or Discover), see even if your insurance coverage Helm, Inc. at: www.helminc.com. does not pay the full cost. Owner’s manuals are written specifically for owners and are To order by mail, write to: If another party's insurance intended to provide basic Helm, Incorporated company is paying for the repairs, operational information about the you are not obligated to accept a Attention: Customer Service vehicle. The owner’s manual repair valuation based on that 47911 Halyard Drive includes the Maintenance Schedule Plymouth, MI 48170 insurance company's collision policy for all models. repair limits, as you have no Make checks payable in U.S. funds. contractual limits with that company. Customer literature publications In such cases, you can have control available for purchase include Radio Frequency of the repair and parts choices as owner’s manuals, warranty long as the cost stays within manuals, infotainment manuals, and Statement reasonable limits. portfolios. Portfolios include an This vehicle has systems that owner’s manual, warranty manual, operate on a radio frequency that infotainment manual, if applicable, complies with Part 15 of the Federal and zip lock bag or pouch. Communications Commission (FCC) rules. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Customer Information 371 Operation is subject to the following Reporting Safety To contact NHTSA, you may call two conditions: the Vehicle Safety Hotline 1. The device may not cause Defects toll-free at 1-888-327-4236 (TTY: harmful interference. 1-800-424-9153); go to http:// Reporting Safety Defects www.safercar.gov; or write to: 2. The device must accept any interference received, including to the United States Administrator, NHTSA interference that may cause Government 1200 New Jersey Avenue, S.E. undesired operation of the Washington, D.C. 20590 device. If you believe that your vehicle has a defect which could cause You can also obtain other Changes or modifications to any of a crash or could cause injury or information about motor vehicle these systems by other than an death, you should immediately safety from http:// authorized service facility could void inform the National Highway www.safercar.gov. authorization to use this equipment. Traffic Safety Administration (NHTSA) in addition to notifying Reporting Safety Defects General Motors. to General Motors If NHTSA receives similar In addition to notifying NHTSA in a complaints, it may open an situation like this, notify General investigation, and if it finds that Motors. a safety defect exists in a group Call 1-800-862-4389, or write: of vehicles, it may order a recall and remedy campaign. Chevrolet Motor Division Chevrolet Customer Assistance However, NHTSA cannot Center become involved in individual P.O. Box 33170 problems between you, your Detroit, MI 48232-5170 dealer, or General Motors. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

372 Customer Information Vehicle Data GM and its affiliates may also download and retrieve stored Recording and information from your vehicle for motor vehicle research and Privacy development, safety and vehicle Your vehicle, like other modern improvement purposes. motor vehicles, has a number of sophisticated computer systems that monitor and control several aspects of the vehicle performance. Your vehicle uses onboard vehicle computers to monitor emission control components to optimize fuel economy and to provide anti-lock braking and to help the driver control the vehicle in difficult driving situations. These computers and your vehicle's Data Recording Module (DRM) also store information about the performance and status of certain systems in your vehicle including the engine, throttle, and braking systems. General Motors and its affiliates, as well as service and repair facilities may access or download and share this information via a direct connection to your vehicle in order to diagnose and repair problems and properly service the vehicle. Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Index 373 Index A Audio Players Accessories and CD ...... 102 Modifications ...... 240 Automatic Add-On Electrical Equipment . . . 236 Transmission ...... 205 Additional Maintenance Transmission Fluid ...... 251 and Care ...... 346 Automatic Transmission Adjustments Selector Lever ...... 214 Seat, Initial Drive ...... 38 Shift Lock Control Function Agreements Check ...... 274 Trademarks and License . . . . . 129 Automatic Transmission Fluid Air Cleaner/Filter, Engine ...... 253 Temperature Warning Light . . . . . 78 Air Conditioning ...... 131 Automatic Transmission Air Filter, Passenger Overdrive Off ...... 215 Compartment ...... 135 Auxiliary Air Vents ...... 134 Devices ...... 117 AM-FM Radio ...... 97 Axle, Rear ...... 271, 272 Antenna B Fixed Mast ...... 102 Battery - North America . . . . 269, 311 Antilock Brake System (ABS) . . . 216 Battery Warning Light ...... 73 Warning Light ...... 76 Biodiesel ...... 228 Appearance Care Blade Replacement, Wiper . . . . . 275 Exterior ...... 317 Bluetooth Interior ...... 323 Overview ...... 121 Assistance Program, Bluetooth Audio ...... 118 Roadside ...... 367 Brake Audio Exhaust ...... 222 Bluetooth ...... 118 System Warning Light ...... 74 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

374 Index Brakes ...... 263 California Control of a Vehicle ...... 139 Antilock ...... 216 Proposition Coolant Exhaust Light ...... 77 65 Warning ...... 240, 269, 311, Engine ...... 253 Fluid ...... 268 Back Cover Engine Temperature Gauge . . . .72 Parking ...... 220 Capacities and Cooling ...... 131 Braking ...... 143 Specifications ...... 357 Cornering Lamps ...... 95 Break-In, New Vehicle ...... 165 Carbon Monoxide Cover Bulb Replacement Engine Exhaust ...... 177 Engine ...... 245 Headlamp Aiming ...... 277 Winter Driving ...... 151 Covers Headlamps ...... 277 Cargo Lamp ...... 96 Winter ...... 172 Headlamps and Front Turn Caution, Danger, and Warning . . . . 3 Cruise Control ...... 223 Signal ...... 280 CD Player ...... 102 Light ...... 82 Interior Lamps ...... 287 Check Cupholders ...... 56 License Plate Lamps ...... 286 Engine Light (Malfunction Customer Assistance ...... 365 Roofmarker Lamps ...... 284 Indicator) ...... 73 Offices ...... 365 Sidemarker Lamps ...... 284 Child Restraints Text Telephone (TTY) Taillamps, Turn Signal, Systems ...... 51 Users ...... 365 Stoplamps, and Back-up Cleaning Customer Information Lamps ...... 286 Exterior Care ...... 317 Publications Ordering Buzzers, Warning ...... 91 Interior Care ...... 323 Information ...... 370 C Climate Control Systems ...... 131 Customer Satisfaction Air Conditioning ...... 131 Procedure ...... 364 Cab Tilting ...... 243 Heating ...... 131 California D Cluster, Instrument ...... 69 Perchlorate Materials Damage Repair, Collision ...... 368 Cold Weather Operation ...... 230 Requirements ...... 240 Danger, Warning, and Caution . . . . 3 Collision Damage Repair ...... 368 Daytime Running Lamps (DRL) Compartments Indicator Light ...... 81 Storage ...... 54 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Index 375 Devices E Engines Auxiliary ...... 117 Electrical Equipment, Diesel Fuel ...... 227 Diesel Engine Add-On ...... 236 Exhaust Brake ...... 222 Engine Alarm and Electrical System Exhaust Brake Light ...... 77 Automatic Shutdown ...... 173 Overload ...... 287 Exhaust Fluid Diesel Exhaust Fluid ...... 24, 189 Emergencies ...... 154, 164 Diesel ...... 189 Diesel Exhaust Fluid (DEF) Engine Extender, Seat Belt ...... 49 Gauge ...... 72 Air Cleaner/Filter ...... 253 Exterior Lamp Controls ...... 92 Diesel Exhaust Fluid (DEF) Alarm and Automatic F Warning Light ...... 80 Shutdown ...... 173 Filter ...... 180 Diesel Particulate Filter ...... 180 Check Light (Malfunction Fuel ...... 270 Distracted Driving ...... 139 Indicator) ...... 73 Filter, Dome Lamps ...... 96 Checks Before Operating . . . . . 175 Engine Air Cleaner ...... 253 Door Compartment Overview ...... 244 Fixed Mast Antenna ...... 102 Locks ...... 30 Coolant ...... 253 Flash-to-Pass ...... 93 Power Locks ...... 33 Coolant Temperature Gauge . . . .72 Flashers, Hazard Warning ...... 94 Drive Belt Routing, Engine ...... 363 Cover ...... 245 Flat Tire ...... 310 Driver Behavior ...... 139 Drive Belt Routing ...... 363 Fluid Driver Information Exhaust ...... 177 Automatic Transmission ...... 251 Center (DIC) ...... 82 Heater ...... 172 Brakes ...... 268 Driving High Idle System ...... 174 Diesel Exhaust ...... 24 Emergencies ...... 154, 164 Oil Pressure Light ...... 79 Power Steering ...... 262 For Better Fuel Economy ...... 24 Overheating ...... 259 Washer ...... 262 Hill and Mountain Roads ...... 150 Reduced Power Light ...... 81 Frequency Statement If the Vehicle is Stuck ...... 153 Running While Parked ...... 179 Radio ...... 370 Wet Roads ...... 149 Shutdown Warning Light ...... 80 Front Seat Position Seats Winter ...... 151 Engine Oil Adjustment ...... 38 Level Indicator Light ...... 79 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

376 Index Fuel Glove Box ...... 55 I Biodiesel ...... 228 GM Mobility Reimbursement Idle Shutdown ...... 174 Cold Weather Operation ...... 230 Program ...... 366 Idle Shutdown Light ...... 80 Diesel Engines ...... 227 H Ignition Positions ...... 166 Economy Driving ...... 24 Hazard Warning Flashers ...... 94 Information Filling the Tank ...... 235 Headlamps Publication Ordering ...... 370 Filter ...... 270 Aiming ...... 277 Information on Loading the Gauge ...... 71 Bulb Replacement ...... 277, 280 Vehicle ...... 58 Running out of Fuel ...... 233 Daytime Running Lamps Instrument Cluster ...... 69 Water in Fuel ...... 231 (DRL) Indicator Light ...... 81 Instrument Panel Fuel for Diesel Engines ...... 227 Flash-to-Pass ...... 93 Storage Area ...... 55 G High-Beam On Light ...... 81 Introduction ...... 2 Gauges High/Low Beam Changer ...... 93 J Diesel Exhaust Fluid (DEF) . . . . .72 Heated Mirrors ...... 34 Jump Starting - North Engine Coolant Temperature . . .72 Heater America ...... 311 Fuel ...... 71 Engine ...... 172 K Odometer ...... 70 Heating ...... 131 Keyless Entry Speedometer ...... 70 High Idle System ...... 174 Remote (RKE) System ...... 26 Tachometer ...... 71 High-Beam On Light ...... 81 Keys ...... 25 Trip Odometer ...... 70 Hill and Mountain Roads ...... 150 Warning Lights and Hooks L Indicators ...... 68 Shopping Bag ...... 57 Lamps General Information Horn ...... 65 Cargo ...... 96 Vehicle Care ...... 240 HVAC ...... 131 Cornering ...... 95 Getting In and Out of the Dome ...... 96 Vehicle ...... 29 Exterior Controls ...... 92 Interior ...... 287 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Index 377 Lamps (cont'd) Lights (cont'd) N License Plate ...... 286 High/Low Beam Changer ...... 93 New Vehicle Break-In ...... 165 Malfunction Indicator (Check Idle Shutdown ...... 80 Noise Control System ...... 272 Engine) ...... 73 Overdrive Off ...... 78 O Roofmarker ...... 284 Reduced Engine Power ...... 81 Odometer ...... 70 Sidemarker ...... 284 Seat Belt Reminders ...... 72 Trip ...... 70 Lap Belt ...... 48 Service Transmission Oil Lighting Warning ...... 77 Engine ...... 245 Illumination Control ...... 95 Service Vehicle Soon ...... 74 Pressure Light ...... 79 Lights Wait to Start ...... 79 Online Owner Center ...... 365 Antilock Brake System Loading the Vehicle ...... 58 Operating Temperature ...... 171 (ABS) Warning ...... 76 Locks Outlets Automatic Transmission Door ...... 30 Power ...... 67 Fluid Temperature ...... 78 Power Door ...... 33 Overdrive Off ...... 215 Battery Warning ...... 73 M Overdrive Off Light ...... 78 Brake System Warning ...... 74 Maintenance and Care Overheating, Engine ...... 259 Check Engine (Malfunction Additional ...... 346 Owner Checks and Services . . . . 340 Indicator) ...... 73 Maintenance Schedule ...... 327 Cruise Control ...... 82 P Recommended Fluids and Daytime Running Parking Lubricants ...... 349 Lamps (DRL) ...... 81 Brake ...... 220 Malfunction Indicator Lamp ...... 73 Diesel Exhaust Fluid (DEF) . . . . .80 Over Things That Burn ...... 176 Messages Engine Oil Level Indicator ...... 79 Passenger Compartment Air Vehicle ...... 86 Engine Oil Pressure ...... 79 Filter ...... 135 Mirrors ...... 33 Engine Shutdown Warning . . . . .80 Pedals ...... 166 Heated ...... 34 Exhaust Brake ...... 77 Perchlorate Materials Flash-to-Pass ...... 93 Requirements, California ...... 240 High-Beam On ...... 81 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

378 Index Phone Rear Axle ...... 271, 272 S Bluetooth ...... 121 Rear Seats ...... 42 Safety Defects Reporting Port Rear Storage ...... 57 General Motors ...... 371 USB ...... 109 Recommended Fluids and U.S. Government ...... 371 Power Lubricants ...... 349 Safety System Check ...... 49 Door Locks ...... 33 Reduced Engine Power Light . . . . 81 Scheduling Appointments ...... 367 Outlets ...... 67 Reimbursement Program, Seat Belts ...... 43 Reduced Engine Light ...... 81 GM Mobility ...... 366 Care ...... 49 Steering Fluid ...... 262 Remote Keyless Entry (RKE) Extender ...... 49 Windows ...... 35 System ...... 26 Lap Belt ...... 48 Power Take-Off (PTO) ...... 237 Replacement Parts Reminders ...... 72 Pregnancy, Using Seat Belts . . . . 47 Maintenance ...... 351 Three-Point ...... 45 Privacy Reporting Safety Defects Use During Pregnancy ...... 47 Vehicle Data Recording ...... 372 General Motors ...... 371 Seats Proposition U.S. Government ...... 371 Position, Front ...... 38 65 Warning, Roads Rear ...... 42 California ...... 240, 269, 311, Driving, Wet ...... 149 Security Back Cover Roadside Assistance Vehicle ...... 33 Publication Ordering Program ...... 367 Selector Lever ...... 214 Information ...... 370 Roofmarker Lamps ...... 284 Service ...... 136 R Rotation, Tires ...... 307 Accessories and Routing, Engine Drive Belt ...... 363 Radio Frequency Statement . . . . 370 Modifications ...... 240 Running out of Fuel ...... 233 Radio Reception ...... 101 Climate Control System ...... 131 Running the Vehicle While Radios Doing Your Own Work ...... 241 Parked ...... 179 AM-FM Radio ...... 97 Scheduling Appointments . . . . . 367 Transmission Warning Light . . . .77 Vehicle Soon Light ...... 74 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

Index 379 Shift Lock Control Function Sun Visors ...... 37 Turn and Lane-Change Check, Automatic System Signals ...... 94 Transmission ...... 274 Noise Control ...... 272 Turn Signal Shopping Bag Hooks ...... 57 T Bulb Replacement ...... 286 Sidemarker Lamps ...... 284 Tachometer ...... 71 U Signals, Turn and Taillamps USB Port ...... 109 Lane-Change ...... 94 Bulb Replacement ...... 286 Using This Manual ...... 3 Specifications and Temperature, Operating ...... 171 Capacities ...... 357 V Text Telephone (TTY) Users . . . . 365 Speedometer ...... 70 Vehicle Three-Point Seat Belt ...... 45 Starting and Stopping the Control ...... 139 Tires Vehicle ...... 168 Getting In and Out ...... 29 If a Tire Goes Flat ...... 310 Steering ...... 149 Identification Number (VIN) . . . 353 Pressure ...... 307 Fluid, Power ...... 262 Messages ...... 86 Rotation ...... 307 Wheel Adjustment ...... 65 Security ...... 33 Tires and Wheels ...... 295 Stoplamps and Back-up Lamps Service Soon Light ...... 74 Towing Bulb Replacement ...... 286 Starting and Stopping ...... 168 Vehicle ...... 315 Storage Towing ...... 315 Trademarks and License Rear ...... 57 Vehicle Care Agreements ...... 129 Storage Areas Tire Pressure ...... 307 Transmission Glove Box ...... 55 Vehicle Data Recording and Automatic ...... 205 Information on Loading the Privacy ...... 372 Fluid, Automatic ...... 251 Vehicle ...... 58 Ventilation, Air ...... 134 Overdrive Off, Automatic ...... 215 Instrument Panel ...... 55 Visors ...... 37 Service Warning Light ...... 77 Storage Compartments ...... 54 Trip Odometer ...... 70 Stuck Vehicle ...... 153 Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA- Localizing-U.S.-12407814) - 2019 - crc - 12/13/17

380 Index W Wait to Start Light ...... 79 Warning Brake System Light ...... 74 Caution and Danger ...... 3 Warning Buzzers ...... 91 Warning Lights, Gauges, and Indicators ...... 68 Warnings Hazard Flashers ...... 94 Washer Fluid ...... 262 Water in Fuel ...... 231 Wheels and Tires ...... 295 Windows Power ...... 35 Windshield Wiper/Washer ...... 66 Winter Driving ...... 151 Winter Cover ...... 172 Wiper Blade Replacement ...... 275 4500HD/4500XD/5500HD Series 4500HD/4500XD/5500HD Low Cab Forward 5.2L Diesel Engine 5.2L Diesel Engine Forward Cab Low chevrolet.com 2019

2019 Low Cab Forward 5.2L Diesel Engine 4500HD/4500XD/5500HD Series 84445126 A 19_CHEV_Low_Cab_Forward_5.2L_Diesel_Engine_4500HD_4500XD_5500HD_Series_COV_84445126A_2017DEC18.ai 1 12/14/2017 4:09:37 PM 4:09:37 12/14/2017 1 1 19_CHEV_Low_Cab_Forward_5.2L_Diesel_Engine_4500HD_4500XD_5500HD_Series_COV_84445126A_2017DEC18.ai 19_CHEV_Low_Cab_Forward_5.2L_Diesel_Engine_4500HD_4500XD_5500HD_Series_COV_84445126A_2017DEC18.ai PM 4:09:37 12/14/2017 K Y M C CY MY CM CMY