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 G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 248 (ENGINE CONTROLS - SELF-DIAGNOSTICS)SYSTEM TESTSMIL INOPERATIVEMIL OPERATION
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
MIL Operation
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION MIL Operation
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
MIL is located on Instrument Panel Cluster (IPC).
MIL Function
- MIL informs driver that a malfunction has occurred and vehicle should be taken in for service as soon as possible.
- MIL illuminates during a bulb test and a system test.
- A DTC will be stored if a MIL is requested by the PCM.
MIL Illumination
- MIL will illuminate with ignition ON and engine not running.
- MIL will turn off when engine is started.
- MIL will remain ON if the self-diagnostic system has detected a malfunction.
- MIL may turn off if malfunction is not present.
- If MIL is illuminated and then engine stalls, MIL will remain illuminated so long as ignition switch is ON.
- If MIL is not illuminated and engine stalls, MIL will not illuminate until ignition switch is cycled OFF, then ON.
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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.