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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Automatic Transmission - 6T40 - DTC P0601 To DTC P0971) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Up and Down Shift Switches >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
    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.
  3. Verify the scan tool Driver Shift Control Mode parameter displays Inactive with the shift lever in the Park, Reverse, Neutral and Drive positions, and Active when the shift lever is left of the Drive position.
    • If the parameter does not display the correct values 

      Refer to Circuit/System Testing.

    • If the parameter displays the correct value 
  4. Shift lever left of the D position.
  5. Verify the scan tool Driver Shift Request parameter changes from None to Upshift when the shift lever is pressed forward, and from None to Downshift when the gear shift lever is pressed rearward.
    • If the parameter does not display the correct values 

      Refer to Circuit/System Testing.

    • If the parameter displays the correct value 
  6. 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.
  7. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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