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 1894 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L LMM - DTC P0016 TO DTC P02E0)DTC P0090CIRCUIT/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 does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Failure to allow the ECM communications to completely terminate with the scan tool may result in misdiagnosis.
If DTC U0105, is also set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Turn OFF the ignition until the ECM is powered down.
- Disconnect the FRP regulator in-line connector.
- Probe the solenoid control circuit terminal 2 with a test lamp connected to ground. The test lamp should not illuminate.
- If the test lamp illuminates, test the solenoid control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
IMPORTANT: A solenoid control circuit that is shorted to voltage will illuminate the test lamp on both the supply voltage circuit and the solenoid control circuit. - Turn ON the ignition.
- Connect the test lamp between the solenoid supply voltage circuit, terminal 1 and a ground. The test lamp should illuminate.
- If the test lamp did not illuminate, test the solenoid supply voltage circuit for an open or short to ground. If the circuit tests normal, replace the ECM.
- Connect the test lamp between the solenoid supply voltage circuit, terminal 1 and the solenoid control circuit, terminal 2. The test lamp should illuminate.
- If the test lamp did not illuminate, test the solenoid control circuit for an open. If the circuit tests normal, replace the ECM.
- Test the harness between the inline connector and the FRP regulator for an open or short to voltage. If the circuits tests normal, replace the FRP regulator.
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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.