The designation for the vehicle engine control computer varies from manufacturer to manufacturer and also from model to model within the manufacturer. Some vehicles have both a ECM and a PCM. Please look for your vehicle type and year and look at the right column for it's location. Vehicle Year Computer Location BUICK Buicks, All except Riviera 1987-1993 Behind dash, passenger side Buick Riviera 1987-1993 Passenger side, behind kick panel CADILLAC Cadillac, All 1987-1995 Behind dash, passenger side CHEVROLET Chevrolet Beretta 1987-1994 Behind dash, passenger side Chevrolet Camaro 1987-1992 Behind dash, passenger side Chevrolet Camaro 1993 Under hood, passenger side near firewall Chevrolet Camaro 1996-2002 Under hood, passenger side near firewall Chevrolet Caprice 1987-1993 Under hood, passenger side near firewall Chevrolet Cavalier 1987-1994 Behind dash, passenger side Chevrolet Celebrity 1987-1989 Behind dash, passenger side Chevrolet Gas Trucks 1987-1995 Behind dash, passenger side Chevrolet SS454 1990-1993 Behind dash, passenger side Chevrolet Gas Trucks 1996-2004 Under hood, drivers side near firewall Chevrolet Duramax 6.6L 2000-2004 Under hood, drivers side in front of battery Chevrolet SUVs 1987-1995 Behind dash, passenger side Chevrolet SUVs 1996-2004 Under hood, drivers side near firewall Chevrolet Corsica 1987-1994 Behind dash, passenger side Chevrolet Impala SS 1996 Behind headlight Chevrolet Lumina 1987-1993 Behind dash, passenger side Chevrolet Monte Carlo 1987-1988 Passenger side, behind kick panel Chevrolet S10/Xtreme 2001-2002 Under hood, passenger side, behind battery CORVETTE Corvette L98 1985-1989 Behind dash, passenger side Corvette L98 & LT1 1990-1996 Under hood, drivers side near firewall Corvette LS1 & LS6 1997-2004 Inside passenger side fender, behind front tire DODGE Dodge Dakota 1998-2003 Under hood, passenger side against fender Dodge Durango 1998-2003 Under hood, passenger side against fender Dodge Ram Gas 1998-2003 Under hood, passenger side on the firewall Dodge Ram Diesel 1998-2002 Mounted directly to passenger side of motor FORD Ford Contour 1999-2003 Passenger side, where floor meets the firewall Ford Crown Vic 1988-2004 Under hood, drivers side in firewall Ford Escort 1988-2003 Under front of center console Ford Excursion 1999-2003 Under dash, drivers side Ford Expedition 1997-2002 Under hood, drivers side in firewall Ford Explorer 1991-2001 Under hood, drivers side in firewall Ford Focus 2000-2003 Passenger side, behind kick panel Ford F-Series Diesel 1994-1998 Under hood, drivers side in firewall Ford F-Series Diesel 1999-2003 Under dash, drivers side Ford Harley Davidson 2002-2004 Under dash, passenger side Ford Lightning 1992-1995 Under hood, drivers side in firewall Ford Lightning 1999-2004 Under dash, passenger side. Ford Mustang, all 1987-2004 Passenger side, behind kick panel Ford Probe 2.0L 1992-1997 Under front of center console Ford Ranger 1988-2000 Under hood, in firewall Ford Taurus 1988-1995 Behind dash, passenger side Ford Taurus 1996-2003 Under hood, drivers side near firewall Ford Tempo 1988-1994 Under dash, drivers side Ford Thunderbird, all 1987-1997 Passenger side, behind kick panel GMC GMC Trucks 1987-1995 Behind dash passenger side GMC Trucks 1996-2004 Under hood, drivers side near firewall GMC Duramax 6.6L 2001-2004 Under hood, drivers side in front of battery GMC SUVs 1987-1995 Behind dash passenger side GMC SUVs 1996-2004 Under hood, drivers side near firewall MERCURY Mercury Cougar 1988-1997 Passenger side, behind kick panel Mercury Cougar 1999-2002 Passenger side, where floor meets the firewall Mercury Marquis 1993-2004 Under hood, drivers side in firewall Mercury Marauder 2003-2004 Under hood, drivers side in firewall Mercury Mystique 1995-2003 Passenger side, where floor meets the firewall Mercury Sable 1988-1995 Behind dash, passenger side Mercury Sable 1996-2003 Under hood, drivers side near firewall OLDSMOBILE Oldsmobile, All 1987-1995 Behind dash passenger side PONTIAC Pontiac, All except below 1987-1995 Behind dash passenger side Pontiac Firebird 1987-1992 Behind dash passenger side Pontiac Firebird 1993-2002 Under hood, passenger side near firewall Pontiac Trans Am 1987-1992 Behind dash passenger side Pontiac Trans Am 1993-2002 Under hood, passenger side near firewall.