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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 216 (Hydraulic Brakes - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC C12F9 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Inspect for damageRefer to: Brake Pedal Excessive Effort 
  3. Ignition/Vehicle - Off - For greater than 10 min
  4. Ignition/Vehicle - On - For greater than 15 s - Brake Pedal Not Applied
  5. Apply and hold the brake pedal. - For greater than 2 s
  6. Slowly release the brake pedal.
  7. Verify DTC C12F9 is not set.
    • If DTC C12F9 is set 

      Replace the component: A104 Brake Master Cylinder

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