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 4 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.3L)SYSTEM TESTSMALFUNCTION INDICATOR LAMP INOPERATIVEDIAGNOSTIC PROCEDURE
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Diagnostic Procedure
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedure
WARNING: This page is about a different variant/trim than selected.
- Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
- Check IGN 1 fuse, located in instrument panel fuse block for "C" & "K" series, or GAUGES fuse, located in instrument panel fuse block for "G" series. If fuse is open, go to step 10. If fuse is not open, go to next step.
- Turn ignition off. Disconnect PCM. Turn ignition on, engine off. Connect a fused jumper wire (3-amp) between PCM Red connector C2 terminal No. 46 (Brown/White wire) and ground. See Fig 1. Observe MIL. If MIL illuminates, go to step 9. If MIL does not illuminate, go to next step.
- If fuse in jumper wire opened, go to step 11. If fuse in jumper wire did not open, go to next step.
- Remove Instrument Panel Cluster (IPC). See appropriate ANALOG INSTRUMENT PANELS article. Check Brown/White wire between PCM and IPC for open. If problem was found, repair as necessary. After repairs, go to step 14. If problem was not found, go to next step.
- Using a test light connected to ground, probe IPC connector terminal B6 (Pink wire) for "C" and "K" series and terminal B17 (Pink wire) for "G" series. See Fig 2 or Fig 3 . If test light is on, go to step 8. If test light is off, go to next step.
- Repair open in Pink wire between IPC and fuse block. After repairs, go to step 14.
- Check IPC connector for poor connections. If problem was found, repair as necessary. After repairs, go to step 14. If problem was not found, go to step 12.
- Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step 14. If problem was not found, go to step 13.
- Repair short to ground in Pink wire between IPC and fuse block. After repairs, go to step 14.
- Repair short to voltage in Brown/White wire between IPC and PCM. After repairs, go to step 14.
- Replace IPC. See appropriate ANALOG INSTRUMENT PANELS article. After repairs, go to step 14.
- Replace PCM. Program PCM. 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.