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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Data Communications - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC B1A1F >> 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 ON/Vehicle In Service Mode.
  2. Verify that DTC U0073-U007E, DTC U0100-U02FF, or DTC U1600-U17FF is not set.
    • Go to next step: If none of the DTCs are set 
  3. Refer to Circuit/System Testing.
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