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 VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.3L - DTC P0016 TO DTC P0336)DTC P0300-P0306REPAIR VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Repair Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Repair Verification
WARNING: This page is about a different variant/trim than selected.
- Install any components the have been removed or replaced during diagnosis.
- Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
- Clear the DTCs.
- Turn OFF the ignition for 60 seconds.
- If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
- To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the repair verification for DTCs P0420 and P0430. Refer to DTC P0420 or P0430 .
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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.