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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 C0021 >> 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 = 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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