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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Automatic Transmission - 8L45 (M5N) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0658, P0659, P2718, P2720, P2721, P2727, P2729, P2730, P281B, P281D, or P281E >> 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. Engine - Running
  2. Verify the scan tool parameter:
    • High Side Driver Circuit High Test Status = Okay or Not Run
    • High Side Driver Circuit Low Test Status = Okay or Not Run
    • High Side Driver Circuit Open Test Status = Okay or Not Run
    • Transmission Control Solenoid Valve 4, 5, 8 Control Circuit High Test Status = Okay or Not Run
    • Transmission Control Solenoid Valve 4, 5, 8 Control Circuit Low Test Status = Okay or Not Run
    • Transmission Control Solenoid Valve 4, 5, 8 Control Circuit Open Test Status = Okay or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. 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 

      Refer to: Circuit/System Testing

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