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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 C1201 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following component/system: Serial Data
    • If a related DTC is not set 
    1. Ignition/Vehicle - Off
    2. Replace the component: K71 Transmission Control Module
    3. Operate the vehicle within the Conditions for Running the DTC.
    4. Verify the DTC does not set.
      • If the DTC sets - Replace the component: K38 Chassis Control Module
      • Go to next step: If the DTC is not set
    5. All OK.
    • Go to next step: If no DTC is set 
  3. All OK.
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