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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0776 Or P0777: Pressure Control Solenoid Valve 2 Stuck Off/On - Transmission Hydraulic/Mechanical Performance >> 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:

    If other DTCs are set, diagnose those DTCs first.

  1. Ignition ON.
  2. Verify DTC P0716, P0717, P0722, P0723, P077C, P077D, P07BF, or P07C0 was not set by reviewing the scan tool Freeze Frame/Failure Records data.
    • Go to next step: If none of the DTCs were set 
  3. Engine idling, transmission in Park, with parking brake applied and drive wheels chocked.
  4. Verify the transmission fluid level and condition is correct. Refer to Transmission Fluid Level and Condition Check .
    • If the transmission fluid level and condition is not correct 

      Repair as necessary.

    • Go to next step: If the transmission fluid level and condition is correct 
  5. Ignition ON, clear the TCM DTCs with a scan tool.
  6. Verify DTC P0776 or P0777 does not set while performing a road test. Refer to Road Test .
    • If DTC P0776 or P0777 sets 

      Refer to Circuit/System Testing.

    • Go to next step: If DTC P0776 or P0777 does not set 
  7. 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.
  8. 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 
  9. All OK.
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