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 28 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0441: EVAP SYSTEM NO FLOW DURING PURGETEST DESCRIPTION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Test Description
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Test Description
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 4 - This step verifies EVAP canister purge solenoid electrical operation.
- 5 - This step tests EVAP canister purge solenoid function.
- 8 - This step uses EVAP Purge/Seal function to test EVAP canister vent solenoid, pressure switching solenoid, and purge solenoid for correct operation. Using EVAP Purge/Seal function also tests for leaks by allowing the technician to seal the system and monitor FTP sensor.
- 9 - This step tests EVAP canister vent valve and hoses for a blockage or restriction. If vacuum does not drop to less than -10.0 in. H2O after 30 seconds, there is a faulty condition in EVAP vent system. EVAP vent portion of EVAP control system is diagnosed in DTC P0446.
- 21 - This step uses EVAP Purge/Seal function to test EVAP canister vent solenoid, pressure switching solenoid, and purge solenoid for correct operation. Using EVAP Purge/Seal function also tests for leaks by allowing the technician to seal the system and monitor 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.