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 G3500, VAN CARGO EXTENDED, 4.8 CREPAIR AND DIAGNOSISBRAKESANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0055 OR P0609CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Cargo Extended, 4.8 C
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Cargo Extended, 4.8 CSECTION Circuit/System Testing
- 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 vehicle speed sensor harness connector. At the EBCM harness connector, 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 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 ECM/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.