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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 10L80 (MHS MHU MQC) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> DTC P18A1, P18AA, P18AB, or P27EC >> 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 the 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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