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Home >> GMC >> 2021 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Automatic Transmission - 9T50 (M3H), 9T60 (M3G) Or 9T65 (M3W M3V) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P18A2 or P18A4 >> Component Testing

Component Testing

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

Static Test

  1. Ignition/Vehicle - Off
  2. Remove the component : Control Valve Body Cover
  3. Disconnect the electrical connector : M123 Transmission Park Valve Lock Solenoid Actuator
  4. Test for 15 to 25 ohms between the test points : Control terminal 1 & Control terminal 2
    • If not between 15 and 25 ohms 

      Replace the component : M123 Transmission Park Valve Lock Solenoid Actuator

    • Go to next step : If between 15 and 25 ohms 
  5. Test for infinite resistance between the test points : Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the component : M123 Transmission Park Valve Lock Solenoid Actuator

    • Go to next step : If infinite resistance 
  6. All OK.
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