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Home >> Cadillac >> 2018 >> 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 P0815, P0816, or P0826 >> Circuit/System Verification

Circuit/System Verification

    WARNING:

    Refer to Parking Brake and Drive Wheels Warning .

  1. Ignition ON, engine OFF, Transmission Shift Lever in the M or manual mode position.
  2. Verify the scan tool Up and Down Shift Switch or Driver Shift Request parameter displays Upshift when pressing the plus (+) switch, Downshift when pressing the minus (-) switch, and Inactive when neither switch is pressed.
    • If the parameter does not display the correct value 

      Refer to Circuit/System Testing

    • Go to next step: If the parameter displays the correct value 
  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.
  4. 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. 
  5. All OK.
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