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Home >> Cadillac >> 2017 >> CTS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826, P0827 or P1876: Up and Down Shift Switch >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine running in Drive range.
  2. Verify the scan tool Driver Shift Control Mode parameter changes from Inactive to Active while pressing the manual button on the shifter.
    • If Active is not displayed 

      Refer to Circuit/System Testing.

    • If Active is displayed 
  3. Verify the scan tool Up and Down Shift Switch 2 displays Active while pressing the Upshift and Downshift switches on the steering wheel.
    • If Active is not displayed 

      Refer to Circuit/System Testing.

    • If Active is displayed 
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  6. All OK.
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