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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 P27EB, P27ED, or P27EE >> Circuit/System Verification

Circuit/System Verification

Parking Brake and Drive Wheels Warning

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: Transmission Range Control Valve 1 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 1 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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