LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 358 (Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Upshift/Downshift Switch >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING:

    Refer to Parking Brake and Drive Wheels Warning .

    NOTE:

    The engine may have to be started to move the shift lever out of the Park position. Once out of the Park position, the engine can be turned OFF.

  1. Verify DTC P182E or P1915 was not set by reviewing the scan tool Freeze Frame/Failure Records.
    • If DTC P182E or P1915 was not set 
  2. Ignition ON, engine OFF, S3 Transmission Shift Lever in the M or manual mode position.
  3. Verify the scan tool Up and Down Shift Switch or TCM 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.

    • If the parameter displays the correct value 
  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.
scientia non olet · About LEMON Manuals