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Home >> Cadillac >> 2019 >> XTS Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 (M7U M7W), 6T75 (M7V), Or 6T80 (Mhm) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0658 or P0659 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool High Side Driver 1 parameter displays ON.
    • If ON is not displayed 

      Refer to Circuit/System Testing.

    • Go to next step: If ON is displayed 
  3. Engine Running, and transmission in Park.
  4. Verify the scan tool parameters listed below do not display Malfunction:
    • High Side Driver 1 Circuit Low Voltage Test Status
    • High Side Driver 1 Circuit Open Test Status
    • High Side Driver 1 Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing.

    • Go to next step: If Malfunction is not displayed 
  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.
  6. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • Go to next step: If the DTC does not set 
  7. All OK.
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