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 144 (BODY CONTROL MODULES)INTERMITTENTSTROUBLE SHOOTING INTERMITTENTSPOSSIBLE CAUSES & CORRECTIONS
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Possible Causes & Corrections
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Possible Causes & Corrections
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Check for poor mating of one connector to another. Terminals may not be fully seated. Check for improperly formed or damaged terminals. Check wire-to-terminal connections.
- Check for poor connection from ignition coil to ground or arcing at spark plug wires or plugs.
- Check for poor connections at integration module ground terminals.
- Check for electrical system interference caused by defective relay, module-driven solenoid or switch, which may cause sharp electrical surge. This type of problem will normally occur when problem component is operated.
- Check for aftermarket parts which may not have been produced to manufacturer specifications. Solenoids without original equipment diodes for circuit protection or voltage regulators using transistors instead of silicone-chip circuitry may cause voltage surges (up to 300 volts) in integration module wiring, causing temporary integration module shutdown. integration module shutdown is a normal response to system over voltage (over 16 volts on most models). integration module re-powers when condition ceases to exist. A rapid shutdown and re-power could cause a flickering MIL with no DTCs set in memory.
- Check for improper installation of electrical accessories such as auxiliary lights, cell phones or 2-way radios.
- Ensure ground wire from integration module to distributor or ignition module is connected to a good ground.
- Check for intermittent short to ground on data circuits of DLC. See WIRING DIAGRAMS .
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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.