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 1463 (ENGINE CONTROLS AND FUEL - 3.6L - DTC P0496 TO DTC P2235)DTC P0496CIRCUIT/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 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the EVAP purge solenoid valve electrical harness connector.
- Start the engine.
- Command the EVAP vent closed.
- Increase the engine speed to 1,200-1,500 RPM.
- Observe the fuel tank pressure sensor inches H2O with a scan tool.
- Verify the scan tool FTP sensor H2O parameter is -0.5 to +0.5 inches H2O.
- If the FTP sensor in H2O parameter is greater than the specified range, replace the EVAP purge solenoid valve.
- With the engine OFF and the ignition ON, disconnect the EVAP purge solenoid valve pipe.
- Observe the FTP sensor in H2O parameter with a scan tool.
- Verify the FTP sensor is -0.5 to +0.5 inches H2O.
- If the FTP sensor parameter is greater than the specified range, replace the FTP sensor.
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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.