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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 360 (Automatic Transmission - 10L60 (MQA) Or 10L80 (MHU) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P18A1, P18AA, P18AB, or P27EC >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  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. Clear DTCs
  4. Road test the vehicle. - Refer to: Road Test 
  5. DTCs related to the following system/component = Not Set - B315A Transmission Range Control Valve 1 Position Switch
    • Go to next step: If no DTC is set 
  6. 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.

    Verify the DTC does not set.

    • If DTC P18A1, P18AA, P18AB, P27EC is set 

      Refer to: Diagnostic Fault Information

    • Go to next step: If no DTC is set 
  7. All OK.
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