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Home >> Buick >> 2024 >> Envision Preferred >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Diagnostic Information and Procedures >> DTC C0021 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition/Vehicle - Off = 10 s - Brake Pedal = Not applied
  2. Ignition - On/Vehicle - In Service Mode
  3. Perform the scan tool control function: Brake Hydraulics Test
  4. 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 
  5. All OK.
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