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 1335 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C056DCIRCUIT/SYSTEM TESTINGC056D 34
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
C056D 34
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION C056D 34
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Program the EBCM. If DTC C056D 34 sets after programming, perform the following steps:
- If DTC C056D 35 is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056D 35 failed this ignition cycle, replace the EBCM.
- If DTC C056D 34 is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056D 34 failed this ignition cycle, program the EBCM.
- If DTC C056D 34 sets after programming, 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.