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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Diagnostic Information and Procedures >> DTC C2A1A >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC C2A1A is not set.
    • If the DTC is set 
    1. Perform the scan tool control function: Brake System Plunger Motor Position Sensor Learn
    2. Clear DTCs
    3. Verify DTC C2A1A is not set.
      • If DTC C2A1A is set

        Test or replace the component: A104 Brake Master Cylinder

      • Go to next step: If DTC C2A1A is not set

        Go to next step: All OK.

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