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Home >> GMC >> 2022 >> Hummer EV >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C2A1B >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool configuration/reset function: Brake System Plunger Pressure Rise Starting Point Learn
  3. Clear DTCs
  4. Verify DTC C2A1B is not set.
    1. Clear DTCs
    2. Verify DTC C2A1B is not set.
      • If DTC C2A1B is set

        Test or replace the component: A104 Brake Master Cylinder

      • Go to next step: If DTC C2A1B is not set

        Go to next step: All OK.

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