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Home >> GMC >> 2021 >> Terrain SLT, 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 P18A2 or P18A4 >> Component Testing

Component Testing

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.

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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