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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 12 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P0300 TO DTC P0699)DTC P0300-P0308CONDITIONS FOR RUNNING THE DTC
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Conditions for Running the DTC
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Conditions for Running the DTC
WARNING: This page is about a different variant/trim than selected.
- DTCs P0117, P0118, P0335, P0336, P2146, P2149, P2152, P2155 and P062C are not set.
- The ECT is more than 40°C (104°F).
- The engine is running at idle for more than 10 seconds.
- The engine RPM is between 500-1,300 RPM.
- The vehicle speed is less than 3 mph.
- The calculated fuel rate is between 3 mm3 and 25 mm3 .
- DTCs P0300-P0308 will run once per ignition cycle when the above conditions are met.
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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.