File in Section: 00 - General Information Bulletin No.: 07-00-89-021 Q Service Bulletin Date: June, 2016 INFORMATION

Subject: Supplemental Information on Trailer Towing and Recreational Vehicle Towing (Dinghy Towing)

Models: 2008-2017 Enclave 2009-2017 2007-2016 GMC Acadia 2017 GMC Acadia Limited 2007-2010

Attention: This Bulletin also applies to any of the above models that may be Export from North America vehicles.

This bulletin has been revised to add the 2014-2017 Model Years. Please discard Corporate Bulletin Number 07-00-89-021 P.

The purpose of this bulletin is to inform dealers of special procedures necessary when towing a trailer or when towing the vehicle behind a recreational vehicle. Towing a Trailer Trailer Weight Information The following chart shows how much the trailer can weigh, based on the vehicle powertrain combination and whether the vehicle is equipped with Trailer Provision (RPO V92). Retailers should refer customers to the appropriate Owner Manual for important trailering tips, vehicle maintenance, and safety rules before towing a trailer.

Maximum Trailer Weight for Vehicles Maximum Trailer Weight for Vehicles Vehicle Built Prior to 12/04/08 Built After to 12/04/08 2007-2016 GMC Acadia, 2017 Acadia Limited, 2007-2010 Saturn OUTLOOK Equipped with Trailer Provisions (RPOV92) 4,500 lb. (2,041 kg) 5,200 lb. (2,359 kg) 2007-2016 GMC Acadia, 2017 Acadia Limited, 2007-2010 Saturn OUTLOOK 2,000 lb. (907 kg) 2,000 lb. (907 kg) Equipped without Trailer Provisions (RPOV92) 2008-2017 Equipped with 4,500 lb. (2,041 kg) 4,500 lb. (2,041 kg) Trailer Provisions (RPO V92) 2008-2017 Buick Enclave Equipped 2,000 lb. (907 kg) 2,000 lb. (907 kg) without Trailer Provisions (RPO V92) 2009-2017 Chevrolet Traverse Equipped 5,200 lb. (2,359 kg) 5,200 lb. (2,359 kg) with Trailer Provisions (RPO V92) 2009-2017 Chevrolet Traverse Equipped 2,000 lb. (907 kg) 2,000 lb. (907 kg) without Trailer Provisions (RPO V92)

Copyright 2016 LLC. All Rights Reserved. Page 2 June,2016 Bulletin No.: 07-00-89-021Q

Important: The following modifications are intended to 3. Re-connect the X7 connector to the BCM. address the ability to update a vehicle to allow the 4. Cut the terminal off the end of this wire and strip electrical function for trailer lighting when trailer towing the end of the wire. is desired only. Modification of a non-V92 vehicle to 5. Splice this wire into the 24 circuit wire that goes bring it up to the towing capacity of a V92 equipped into BCM connector X6, pin 2. The 24 circuit is light vehicle is not practical or recommended. The V92 green. package when ordered as part of the original build of the vehicle includes additional cooling capability, Towing a Trailer with a Vehicle without Trailer engine and transmission calibrations to include a Tow/ Provisions (RPO V92) (2008-2012 Model Year Built Haul mode, which are not available for retrofit. The Prior to May 01, 2012) towing capability will remain at the non-V92 limits, even after the recommended electrical updates included in this bulletin to allow trailer lighting to function. These vehicles must be modified by installing a new underhood bussed electrical center (UBEC) to provide Towing a Trailer with a Vehicle without Trailer full functionality for 4 circuits: ground, tail lamps, RH Provisions (RPO V92) (2007 Model Year Only) and LH stop/turn lamps. Perform this modification only if the customers will be using the vehicle to tow. These vehicles must be modified by installing a new The replacement of the UBEC remains the best underhood bussed electrical center (UBEC) to provide solution to upgrade the vehicles wiring for towing. The full functionality for 4 circuits: ground, tail lamps, RH electrical circuitry for the tail/stop lamps is controlled by and LH stop/turn lamps. Perform this modification only the BCM and splicing into the body harness is not if the customers will be using the vehicle to tow. recommended. The replacement of the UBEC remains the best Towing a Trailer with a Vehicle without Trailer solution to upgrade the vehicles wiring for towing. The Provisions (RPO V92) (2012-2017 Model Year Built electrical circuitry for the tail/stop lamps is controlled by After April 30, 2012) the BCM and splicing into the body harness is not recommended. The backup lamp circuit will also need to be modified These vehicles must be modified by installing the using the following procedure: necessary relays and fuses into the underhood bussed electrical center (UBEC) to provide full functionality for 1. Disconnect the X7 connector from the Body 4 circuits: ground, tail lamps, RH and LH stop/turn Control Module (BCM). lamps. Refer to the illustration below for relay and fuse 2. Remove the terminal for pin 3 from the BCM X7 locations. Perform this modification only if the connector. The wire to this terminal is dark blue customers will be using the vehicle to tow. and is the 38 circuit. Bulletin No.: 07-00-89-021Q June,2016 Page 3

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2704723 Recreational Vehicle Towing (Dinghy towing are known as "dinghy towing" (towing the vehicle with all four wheels on the ground) and "dolly Towing) towing" (towing the vehicle with two wheels on the Recreational Vehicle Towing Information ground and two wheels up on a device known as a "dolly"). With the proper preparation and equipment, Important: Vehicles that are "dinghy towed" must be many vehicles can be towed in these ways. Refer to the started at the beginning of each day and at each fuel appropriate model/model year Owner Manual for stop for a minimum of five minutes. towing preparation guidelines and dolly and dinghy Recreational vehicle towing means towing the vehicle towing procedures. The Towing Chart below behind another vehicle - such as behind a motorhome. summarizes powertrain combination compatibility with The two most common types of recreational vehicle dolly and dinghy towing methods. Recreational Vehicle Towing Chart Powertrain Combination and Towing Rear Wheels on a Tow Front Wheels on a Tow All Four Wheels on the Method Dolly Dolly Ground (Dinghy) 3.6L V6 Engine with Front-Wheel Drive and No Yes Yes* 6T75 Six-Speed Automatic Transaxle (MY9) 3.6L V6 Engine with All-Wheel Drive and No** No** Yes* 6T75 Six-Speed Automatic Transaxle (MH6)

*Caution: These vehicle can be dinghy towed from the Dinghy Towing Procedure (2007-2008 Model Year) front for unlimited miles at 65 mph (105 km/h). To avoid Caution: If you tow your vehicle without performing vehicle damage, never exceed 65 mph (105 km/h) while each of the steps listed under "Dinghy Towing," you towing these vehicles. The repairs would not be could damage the automatic transmission. Be sure to covered by the warranty. follow all steps of the dinghy towing procedure prior to **Caution: Dolly towing an all-wheel drive vehicle may and after towing your vehicle. result in premature failure of the rear drive module. Caution: Don't tow a vehicle with the front drive wheels on the ground if one of the front tires is a compact spare tire. Towing with two different tire sizes on the front of the vehicle can cause severe damage to the transmission. Page 4 June,2016 Bulletin No.: 07-00-89-021Q

Important: All-wheel drive vehicles may only be Important: All-wheel drive vehicles may only be dinghy towed from the front, with all four wheels on the dinghy towed from the front, with all four wheels on the ground. ground. 1. Position the vehicle to tow. Shift the transmission 1. Position the vehicle to tow. Shift the transmission to PARK (P) and turn the ignition to OFF. to PARK (P) and turn the ignition to OFF. 2. Securely attach the vehicle being towed to the tow 2. Securely attach the vehicle being towed to the tow vehicle. vehicle. 3. Set the parking brake. 3. Set the parking brake. 4. Turn the ignition to ACCESSORY. 4. Turn the ignition to ACCESSORY. 5. Shift your transmission to NEUTRAL (N). 5. Shift your transmission to NEUTRAL (N).

2519677 2513344 6. To prevent your battery from draining while the Important: The fuses must be removed in the order vehicle is being towed, remove the 50 amp BATT1 specified. fuse (1) in the UBEC and store in a safe location. 6. Remove the 15 amp ECM fuse (1) in the UBEC 7. Release the parking brake. and store in a safe location. Once you have reached your destination, do the 7. To prevent your battery from draining while the following steps: vehicle is being towed, remove the 50 amp BATT1 fuse (2) in the UBEC and store in a safe location. 1. Set the parking brake. 8. Release the parking brake. 2. Reinstall the BATT1 fuse. Once you have reached your destination, do the 3. Shift the transmission to PARK (P), turn the ignition following steps: key to OFF and remove the key from the ignition. 1. Set the parking brake. 4. Release the parking brake. 2. Reinstall the BATT1 fuse. Dinghy Towing Procedure (2009-2012 Model Year 3. Reinstall the ECM fuse. Built Prior to May 01, 2012) 4. Shift the transmission to PARK (P), turn the ignition Caution: If you tow your vehicle without performing key to OFF and remove the key from the ignition. each of the steps listed under "Dinghy Towing," you 5. Release the parking brake. could damage the automatic transmission. Be sure to follow all steps of the dinghy towing procedure prior to Dinghy Towing Procedure (2012-2017 Model Year and after towing your vehicle. Built After April 30, 2012) Caution: Don't tow a vehicle with the front drive Caution: If you tow your vehicle without performing wheels on the ground if one of the front tires is a each of the steps listed under "Dinghy Towing," you compact spare tire. Towing with two different tire sizes could damage the automatic transmission. Be sure to on the front of the vehicle can cause severe damage to follow all steps of the dinghy towing procedure prior to the transmission. and after towing your vehicle. Caution: Don't tow a vehicle with the front drive wheels on the ground if one of the front tires is a compact spare tire. Towing with two different tire sizes on the front of the vehicle can cause severe damage to the transmission. Bulletin No.: 07-00-89-021Q June,2016 Page 5

Important: All-wheel drive vehicles may only be 6. Remove the 20 amp ECM 1 fuse (1) in the UBEC dinghy towed from the front, with all four wheels on the and store in a safe location. ground. 7. To prevent your battery from draining while the 1. Position the vehicle to tow. Shift the transmission vehicle is being towed, remove the 50 amp BATT1 to PARK (P) and turn the ignition to OFF. fuse (2) in the UBEC and store in a safe location. 2. Securely attach the vehicle being towed to the tow 8. Release the parking brake. vehicle. Once you have reached your destination, do the 3. Set the parking brake. following steps: Note: If the ignition is turned to the RUN position 1. Set the parking brake. during this step, the MIL will illuminate with DTCs 2. Reinstall the BATT1 fuse. U0100 and P0700 set in the transmission control 3. Reinstall the ECM 1 fuse. module (TCM). To clear the DTCs, the ignition must be cycled three times. 4. Shift the transmission to PARK (P), turn the ignition key to OFF and remove the key from the ignition. 4. Turn the ignition to ACCESSORY. 5. Release the parking brake. 5. Shift your transmission to NEUTRAL (N). Parts Information (2007-2012 Model Year Built Prior to May 01, 2012) For part numbers and usage of the UBEC, see Group 02.483 of the appropriate Parts Catalog. Saturn retailers should refer to the appropriate model year Parts & Illustration Catalog for the vehicle. Order the UBEC with the same option content including RPOV92. Parts Information (2012-2017 Model Year Built After April 30, 2012)

Part Number Description Qty 19116059 Relay 3 19116050 30 Amp Fuse 2 19116042 10 Amp Fuse 4

Warranty Information 2734174 Please advise the customer that the installation and Important: The fuses must be removed in the order cost of the new underhood bussed electrical center specified. (UBEC) will not be covered under the vehicle's warranty.

GM bulletins are intended for use by professional technicians, NOT a "do-it-xourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide mformat1on that could assist in the proper WE SUPPORT VOLUNTARY service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your TECHNICIAN vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the CERTIFICATION information.