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Home >> GMC >> 2022 >> Terrain AT4 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C2A20 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function:Deactivate Brake Boost System
  3. Verify there are no leaks in the component/system:Brake System - Refer to:Brake Fluid Loss 
  4. Apply the brake pedal. - More than 2 times.
  5. Perform the scan tool control function:Brake Hydraulics Test
    • Go to next step: If the procedure/test passes 
  6. Ignition/Vehicle - Off - For greater than 10 min
  7. Ignition/Vehicle - On - For greater than 15 s - Brake Pedal Not Applied
  8. Apply and hold the brake pedal. - Hard - For greater than 120 s
  9. Release the brake pedal.
  10. Verify DTC C2A20 is not set.
    • If DTC C2A20 is set 

      Test or replace the component:A104Brake Master Cylinder

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