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Home >> GMC >> 2022 >> Terrain SLT, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures (1 Of 2) >> Diagnostic Information and Procedures >> DTC P171D >> Circuit/System Verification

Circuit/System Verification

  1. Verify the condition does not exist:Incorrect fluid level or condition - Transmission - 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 P171D is not set.
    • If DTC P171D is set 

      Refer to:Diagnostic Fault Information

    • Go to next step: If no DTC 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 P171D is not set.

    • If DTC P171D is set 

      Refer to: Diagnostic Fault Information

    • Go to next step: If no DTC is set 
  7. All OK.
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