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 MANUALSCHEVROLET2011CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.6 LREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEMDIAGNOSTIC INFORMATION & PROCEDURESDTC C0055 OR P0609CIRCUIT/SYSTEM VERIFICATION
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L
Circuit/System Verification
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Circuit/System Verification
NOTE:
A condition may result in a stored history DTC C0055, check the replicated transmission output speed signal circuit for damaged wires, missing pulses or electrical noise that may be passed to 128K pulses/mile engine speed signal.
- Verify that no DTCs are set in the ECM or TCM.
- If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Observe the scan tool Rear Wheel Speed parameter. The rear wheel speed reading should be within 2 mph of the front speed sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).
- If not within the specified range, refer to Circuit/System Testing below.
- Operate the vehicle within the Conditions for Running the DTC, to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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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.