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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Up and Down Shift Switches >> Circuit/System Verification

Circuit/System Verification

    WARNING:

    Refer to Parking Brake and Drive Wheels Warning .

  1. Ignition ON, engine OFF.
  2. Verify with a scan tool no internal mode switch (IMS) DTCs set.
    • If IMS DTCs are not set 
  3. Verify with a scan tool the Driver Shift Control Mode parameter displays Inactive with the shift lever in the Park, Reverse, Neutral, and Drive positions, and Active when the gear shift lever is moved left of the D position, then pressed forward or rearward.
    • If the parameter does not display the correct values 

      Refer to Circuit/System Testing below.

    • If the parameter displays the correct value 
  4. Shift lever left of the D position, verify the scan tool Driver Shift Request parameter changes from Inactive to Upshift when the shift lever is pressed forward, and from Inactive to Downshift when the shift lever is pressed rearward.
    • If the parameter does not display the correct values 

      Refer to Circuit/System Testing below.

    • If the parameter displays the correct value 
  5. Operate the vehicle within the conditions for running the DTC to verify the DTC does not set. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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