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Home >> GMC >> 2021 >> Terrain SLE, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P27EF, P27F1, or P27F2 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Parking Brake and Drive Wheels Warning

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: Transmission Range Control Valve 2 Position Switch = 0.6 to 1.0 V
    • If not between 0.6 and 1.0 V 

      Refer to: Circuit/System Testing

    • Go to next step: If between 0.6 and 1.0 V 
  3. Engine - Running
  4. Transmission Range - D
  5. Verify the scan tool parameter: Transmission Range Control Valve 2 Position Switch = 1.7 to 2.1 V
    • If not between 1.7 and 2.1 V 

      Refer to: Circuit/System Testing

    • Go to next step: If between 1.7 and 2.1 V 
  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 the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  7. All OK.
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