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Home >> GMC >> 2007 >> Sierra 2500 HD, 2D Pickup, 6.6 6, 4WD, Part Time >> Repair and Diagnosis >> Body & Frame >> Towing Systems >> Trailer Brake Control System >> Diagnostic Information and Procedures >> DTC C0800 >> Circuit/System Testing

Circuit/System Testing

  1. If the DTC is history, refer to Charging System Test .
  2. If the DTC is current, start the engine, and measure the voltage between the battery positive voltage circuits of the TBCM and the ground circuit.
    • If the voltage is within 9-17 volts, replace the affected module.
    • If the voltage is not within 9-17 volts, measure the voltage between the battery positive voltage circuits of the TBCM and a separate good ground.
    • If the voltage is within 9-17 volts, test the battery positive ground circuits of the TBCM for high resistance or an open, and repair as necessary.
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