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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1065 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - DTC P0016 TO DTC P0299)DTC P009ECIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
If any other DTCs are set other than DTC P009E, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Remove the fuel pressure relief valve return hose and plug the hose to prevent fuel leakage.
- Install a section of rubber fuel hose on the fuel pressure relief valve connection and place loose end of hose into a clean fuel container.
- If the engine cranks but does not start, crank the engine for 15 seconds. Observe for no fuel leaking from fuel pressure relief valve.
IMPORTANT: Fuel that is contaminated with gasoline may cause permanent damage to the fuel pressure relief valve. Refer to Contaminants-in-Fuel Diagnosis .- If fuel leaks from the fuel pressure relief valve, replace the pressure relief valve. Refer to Fuel Pressure Relief Valve Replacement .
- If the engine starts and runs, idle the engine while commanding the fuel rail pressure to 180 MPa with a scan tool. Observe for no fuel leaking from fuel pressure relief valve.
- If fuel leaks from the fuel pressure relief valve, replace the pressure relief valve. Refer to Fuel Pressure Relief Valve Replacement .
- If the circuits test normal, go to Diagnostic Aids.
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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.