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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, or P2157 >> 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. NOTE:

    This step only applies to the following component DTCs: Q17 Fuel Injector

  2. Verify DTC P1248 - P124B is not set and no other DTCs are set.
    • If DTC P1248 - P124B is not set and other DTCs are set 

      Refer to: Circuit/System Testing - Test 1

    • If DTC P1248 - P124B is set and no other DTCs are set 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If no DTC is set 
  3. Engine - Running
  4. Verify the scan tool parameter: Cylinder 1 - 4 Current Misfire Counter = Does not Increment

    Perform the action while monitoring the parameter:

    Wiggle the harness and connector: K20 Engine Control Module

    • If the parameter value increments 

      Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)

    • Go to next step: If the parameter value does not increment 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Repeat step 2

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