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Home >> GMC >> 2024 >> Terrain SLT, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> DTC P18A8 >> Circuit/System Verification

Circuit/System Verification

  1. Verify the condition does not exist: Incorrect fluid level or condition - Refer to: Transmission Fluid Level and Condition Check 
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  2. Ignition - On / Vehicle - In Service Mode
  3. Perform the following action: Clear DTCs
  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.
  5. Verify DTC P18A8, P27EB, P27ED, P27EE, P27EF, P27F1, P27F2 is not set.
    • If DTC P27EB, P27ED, P27EE, P27EF, P27F1, P27F2 is set 

      Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

    • If DTC P18A8 is set 

      Refer to: Diagnostic Fault Information & Verify the conditions listed in the table do not exist

    • Go to next step: If none of the DTCs are set 
  6. All OK.
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