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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1890 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - TROUBLESHOOTING AND DIAGNOSIS)FUEL HEATER INOPERATIVECIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Check the Water in Fuel lamp for proper operation. Refer to Water in Fuel Indicator Malfunction .
- Disconnect the fuel heater harness connector from the top of the fuel filter/heater element housing.
- Turn ON the ignition with the engine OFF.
- Probe the fuel heater ignition 1 voltage circuit with a test lamp connected to a good ground.
- If the test lamp did not illuminate repair the short to ground or open in the ignition 1 voltage circuit.
- Probe the fuel heater ground circuit at the fuel filter/heater element housing with a test lamp connected to battery voltage.
- If the test lamp did not illuminate repair the open in the ground circuit between the fuel filter/heater element housing and the engine ground.
- Remove the fuel filter from the fuel filter/heater element housing. Test the ignition 1 voltage circuit and the ground circuit for an open in the fuel filter/heater element housing.
- If either circuit tested open replace the fuel heater element.
- If all circuits test normal, test the fuel heater thermostatic switch for proper operation. Refer to Component Testing in this diagnostic.
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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.