Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2005CHEVY EXPRESS G3500, VAN PASSENGER, LQ4REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESPROGRAMMING AND SETUP - ALL SYSTEMSREPAIR INSTRUCTIONSPOWERTRAIN CONTROL MODULE PROGRAMMING AND SETUPPCM REPLACEMENT
2005 Chevrolet Chevy Express G3500, Van Passenger, LQ4
PCM Replacement
2005 Chevrolet Chevy Express G3500, Van Passenger, LQ4SECTION PCM Replacement
If the powertrain control module (PCM) is replaced, the following procedures must be performed:
- The PCM Reprogramming-Refer to Service Programming System (SPS) .
- The CKP Variation Learn
- Refer to CKP System Variation Learn Procedure in Engine Controls for the 4.3L (LU3).
- Refer to CKP System Variation Learn Procedure in Engine Controls for the 4.8L, 5.3L, 6.0L (LR4, LM7, LQ4, LQ9, or L59).
- The Theft Deterrent Programming-Refer to Programming Theft Deterrent System Components in Theft Deterrent.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.