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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 C004B >> 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. Verify the brake fluid level is not low.
    • If the fluid is low 

      Repair as necessary

    • Go to next step: If the fluid is not low 
  3. Refer to Circuit/System Testing.
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