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Home >> GMC >> 2024 >> Acadia AT4 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C0678: >> Circuit / System Testing

Circuit / System Testing

  1. Verify there are no other DTCs set.
    • Go to next step: If no other DTCs are set 
  2. Replace the B20A Brake Fluid Level Indicator Switch
  3. Verify the DTC does not set.
    • If the DTC sets 

      Replace the K160 Brake System Control Module.

    • Go to next step: If the DTC does not set 
  4. All OK.
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