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 1185 (ENGINE CONTROLS AND FUEL - 6.6L - DTC P02E7 TO DTC P0699)DTC P040FCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Determine the ambient temperature by using an accurate thermometer.
- If the ignition has been OFF for greater than 10 hours, determine which EGR temperature sensor is skewed by comparing EGR temperature Sensor 1 and 2 parameters to the ambient temperature with a scan tool. The readings should be within 11°C (20°F) of each other, and also the ambient temperature.
- Engine running, observe the scan tool EGR temperature Sensor 1 and 2 parameters. The readings should be between -39 to +400°C (-38 to +752°F), depending on the current ambient temperature and the vehicle operating conditions
- Engine running, observe the DTC information with a scan tool. DTC P040F should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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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.