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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 191 (Data Communications - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC U2000-U20FF >> 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 DTC U2000 - U20FF is not set.
    • If any of the DTCs are set 
    1. Perform all necessary programming and setup procedures for the control module that sets the DTC.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the control module that sets the DTC.
      • Go to next step: If the DTC does not set
    3. All OK.
    • Go to next step: If none of the DTCs are set 
  3. All OK
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