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Home >> GMC >> 2020 >> Acadia SL >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C0021 >> Circuit/System Verification

Circuit/System Verification

  1. Verify DTC C05B0 is not set.
    • Go to next step: If the DTC is not set 
  2. Ignition/Vehicle - Off = 10 s - Brake Pedal = Not applied
  3. Ignition - On / Vehicle - In Service Mode
  4. Perform the scan tool control function: Brake Hydraulics Test
  5. Verify DTC C0021 is not set.
    • If DTC C0021 is set 

      Replace the component: A104 Brake Master Cylinder

    • Go to next step: If the DTC is not set 
  6. All OK.
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