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 CARSECTION 45 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.1L ENGINE)SYSTEM TESTSMIL ON STEADYDIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Diagnostic Procedures
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
- With a scan tool observe the DTCs. Are any DTCs set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
- Turn ignition off. Observe the MIL on the Instrument Panel Cluster (IPC). Is MIL ON? If yes, go to step 6. If no, go to next step.
- Install a scan tool. Command the MIL ON and OFF several times while monitoring the IPC. Does the MIL turn ON and OFF when commanded? If yes, problem is intermittent. If no, go to next step.
- Test the MIL control circuit for a short to ground. After repairs, go to step 7.
- Test the MIL control circuit for a short to voltage. Repair as necessary. After repairs, go to next step.
- Install a scan tool. Command the MIL ON and OFF several times while monitoring the IPC. Does the MIL turn off when commanded? If yes, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS . If no, go to step 2.
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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.