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 1041 (TRAILER BRAKE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C056D OR C056ECIRCUIT/SYSTEM TESTINGC056E
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing: C056E
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION C056E
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Program the TBCM. If DTC C056E sets after programming, perform the following steps:
- If DTC C056D is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056D failed this ignition cycle, replace the TBCM.
- If DTC C056E is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056E failed this ignition cycle, program the TBCM.
- If DTC C056E sets after programming, replace the TBCM.
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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.