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Home >> GMC >> 2021 >> Acadia AT4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 413 (Automatic Transmission - 9T60 (M3G) Or 9T65 (M3W) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P189C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: K71 Transmission Control Module
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for 2 to 12 V between the test points: Serial Data circuit terminal 31 & Ground
    • If not between 2 and 12 V 

      Repair the open/high resistance in the circuit.

    • Go to next step: If between 2 and 12 V 
  5. Replace the component: K71 Transmission Control Module
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