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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE CONTROLS SELF-DIAGNOSTICS - 6.5L)SYSTEM TESTSMIL INOPERATIVE
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Mil Inoperative
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Mil Inoperative
WARNING: This page is about a different variant/trim than selected.
NOTE:
For circuit reference, see WIRING DIAGRAMS article.
- Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
- Check fuse that supplies voltage to MIL. If fuse is open, go to step 10. If fuse is okay, go to next step.
- Turn ignition off. Disconnect PCM. Turn ignition on, with engine off. Connect fused jumper wire (3-amp) between MIL control circuit and ground. Observe MIL. If MIL illuminates, go to step 9. If MIL does not illuminate, go to next step.
- Check fuse in jumper. If fuse is open, go to step 11. If fuse is okay, go to next step.
- Remove Instrument Panel Cluster (IPC). Check MIL control circuit for open between PCM and IPC. Repair as necessary. After repairs, go to step 14. If circuit is okay, go to next step.
- Using test light connected to ground, probe MIL ignition supply voltage circuit at IPC harness connector. If test light illuminates, go to step 8. If test light does not illuminate, go to next step.
- Repair open in MIL ignition supply voltage circuit. After repairs, go to step 14.
- Check IPC connector for poor connections. Repair as necessary. After repairs, go to step 14. If connections are okay, go to step 12.
- Check PCM connector for poor connections. Repair as necessary. After repairs, go to step 14. If problem connections are okay, go to step 13.
- Repair short to ground in MIL ignition supply voltage circuit. See WIRING DIAGRAMS article. After repairs, go to step 14.
- Repair short to voltage in MIL control circuit. After repairs, go to step 14.
- Replace IPC. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step 14.
- Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After repairs, go to next step.
- Operate system to verify repair.
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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.