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 MANUALSCHEVROLET2002SILVERADO 1500 HD, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 72 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)SYSTEM TESTSMIL ON STEADYDIAGNOSTIC PROCEDURES
2002 Chevrolet Silverado 1500 HD, RWD
Diagnostic Procedures
2002 Chevrolet Silverado 1500 HD, RWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.
- Turn OFF ignition. Disconnect PCM harness connector. Turn ON ignition, leaving engine OFF. Is MIL illuminated? If yes, go to next step. If no, go to step 5.
- Remove Instrument Panel Cluster (IPC). Test MIL control circuit for short to ground between PCM and IPC. Did you find and correct the condition? If yes, go to step 6. If no, go to next step.
- Replace IPC. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. When complete, go to step 6.
- Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After replacing PCM, go to next step.
- Start engine and observe MIL. Does the MIL turn OFF in about 1-2 seconds after engine is started? If yes, system is okay. If no, perform DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.
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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.