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 2105 (TRAILER BRAKE CONTROL SYSTEM)REPAIR INSTRUCTIONSTRAILER BRAKE CONTROL RELAY REPLACEMENT (2500, 3500)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Trailer Brake Control Relay Replacement (2500, 3500)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Trailer Brake Control Relay Replacement (2500, 3500)

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Trailer Brake Control Relay (2500, 3500)

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
Preliminary Procedures Turn the ignition switch to the OFF position. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1	Trailer Brake Control Relay Electrical Connector Procedure: Disconnect the electrical connector.
2	Trailer Brake Control Relay Bolt (Qty: 2) CAUTION: Refer to Fastener Caution . Procedure: Loosen, but do not remove the bolts. It is not necessary to completely remove the bolts. Tighten: 6 N.m (53 lb in)
3	Trailer Brake Control Relay Procedure: Slide the relay upward to remove.

RENDER: 1.0x

NO RELATED

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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.