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 TESTING
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L
Circuit/System Testing
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Circuit/System Testing
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.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for greater than 10 V between the signal circuit terminal 20 and ground.
- If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition OFF, disconnect the appropriate harness connector listed below at the ECM:
- X1 (LMF, L20, L96 or LU3)
- X2 (LGH or LMM)
- Ignition ON, verify that a test lamp does not illuminate between the appropriate signal circuit terminal listed below and ground.
- Terminal 50 X1 (LU3)
- Terminal 57 X1 (LMF, L20 or L96)
- Terminal 27 X2 (LGH)
- Terminal 54 X2 (LMM)
- If the test lamp illuminates, test the signal circuit for a short to voltage.
- If the circuit tests normal, replace the EBCM.
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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.