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 1155 (TRAILER BRAKE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSYMPTOMS - TRAILER BRAKE CONTROLSVISUAL/PHYSICAL INSPECTION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Visual/Physical Inspection
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Visual/Physical Inspection
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect for aftermarket devices which could affect the operation of the Trailer Brake Control system. Refer to Checking Aftermarket Accessories .
- For vehicles displaying a TRAILER NOT CONNECTED message with a trailer connected.
- Inspect the trailer brake connector and circuits for proper connections, perform the following steps:
- Verify SSR circuit 47 pin A to the trailer connector pin C for continuity.
- Verity SSR circuit 1750 pin B to ground and to the trailer connector pin B for continuity.
- If all circuits test normal the vehicle TBCM system is not at fault, otherwise most associated circuit faults on the vehicle side will set DTC's in the TBCM.
- Insure the trailer is equipped with electric over electric brakes - only trailers equipped with electric brakes will be recognized and function correctly with TBCM.
- If the trailer is equipped with hydraulic brakes this trailer will not be recognized by the TBCM. The vehicle chassis to trailer connector ground or the trailer ground circuits or trailer brake electric magnets are likely at fault.
- The Trailer brake connector should measure less than 2 ohms of resistance between pins A & B of the trailer side connector. Note - a minimum of one fully functioning axle of brakes is required for the TBCM system to function correctly.
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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.