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 1144 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0055 OR P0609 (WITH JF3 OR JH6)CIRCUIT/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 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.
- Use a scan tool in order to clear the DTCs. Cycle the ignition to OFF and then start the engine. A current failure will set a DTC.
- If the DTC does not reset, go to Diagnostic Aids.
- Turn OFF the ignition and disconnect the EBCM harness connector. At the EBCM harness connector terminal 31 W/JF3 or terminal 20 W/JH6, test for 10 volts on the vehicle speed signal circuit.
- If the voltage is below 10 volts, test for an open or short to ground on the vehicle speed signal circuit. If all circuits test normal, replace the EBCM.
- Ignition ON, verify that a test lamp does not illuminates between the vehicle speed signal circuit terminal 31 W/JF3 or terminal 20 W/JH6 and ground.
- If the test lamp illuminate, test the vehicle speed signal circuit for a short to B+. If the circuit tests normal, replace the EBCM.
- If all circuits test normal, replace the PCM.
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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.