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Home >> GMC >> 2021 >> Acadia AT4 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T50 (M3H), 9T60 (M3G) Or 9T65 (M3W) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P2820 or P2821 >> Circuit/System Verification

Circuit/System Verification

  1. Verify the condition does not exist: Incorrect fluid level or condition - Refer to Transmission Fluid Level and Condition Check 
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  2. Ignition - On / Vehicle - In Service Mode
  3. Clear DTCs
  4. Road test the vehicle. - Refer to Road Test 
  5. Verify DTC P0716, P0717, P0721, P0722, P0723, P07BF, P077C, P077D, P07C0, P176B, P176C, P176D, P17D3, P2731, P2820, P2821 is not set.
    • If DTC P0716, P0717, P0721, P0722, P0723, P07BF, P077C, P077D, P07C0, P176B, P176C, P176D, P17D3 is set 

      Refer to Diagnostic Trouble Code (DTC) List - Vehicle

    • If any DTC listed in the DTC Descriptor Category is set 

      Refer to Diagnostic Fault Information

    • Go to next step: If none of the DTCs listed in the DTC Descriptor Category is set 
  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.

    Verify DTC P0716, P0717, P0721, P0722, P0723, P07BF, P077C, P077D, P07C0, P176B, P176C, P176D, P17D3, P2731, P2820, P2821 is not set.

    • If DTC P0716, P0717, P0721, P0722, P0723, P07BF, P077C, P077D, P07C0, P176B, P176C, P176D, P17D3 is set 

      Refer to Diagnostic Trouble Code (DTC) List - Vehicle

    • If any DTC listed in the DTC Descriptor Category is set 

      Refer to Diagnostic Fault Information

    • Go to next step: If none of the DTCs listed in the DTC Descriptor Category is set 
  7. All OK.