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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 P18A2 or P18A4 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P2670, P2671 is not set.
  3. Perform the scan tool control function: Transmission Park Valve Lock Solenoid Actuator - On and Off

    Verify the scan tool parameter:

    • Transmission Park Valve Lock Solenoid Actuator Control Circuit High Voltage Test Status = OK or Not Run
    • Transmission Park Valve Lock Solenoid Actuator Control Circuit Low Voltage Test Status = OK or Not Run
    • Transmission Park Valve Lock Solenoid Actuator Control Circuit Open Test Status = OK or Not Run
    • If not the specified state 

      Refer to Circuit/System Testing

    • Go to next step: If the specified state 
  4. 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 
  5. All OK.
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