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 1076 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - DTC P154B TO DTC P2693)DTC P2510CIRCUIT/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 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- With the ignition ON, disconnect the PWR/TRN relay and observe with the scan tool for loss of communication.
- If the scan tool can still communicate with the vehicle, test the IGN 1 voltage circuit supplied by the ECM relay for a short to voltage. If the circuits test normal, replace the ECM.
- With the ignition OFF, probe the relay control circuit X2 19 at the underhood electrical center with a test lamp connected to battery voltage.
- If the test lamp illuminates test the relay control circuit for a short to ground. If the circuits test normal, replace the ECM.
- With the ignition ON, probe the relay control circuit X2 19 at the underhood electrical center with a test lamp connected to a good ground.
- If the test lamp illuminates, repair the short to voltage.
- If the test lamp does not illuminate, replace the relay.
IMPORTANT:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
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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.