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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 P27EB, P27ED, or P27EE >> Circuit/System Verification

Circuit/System Verification

WARNING:

Apply the parking brake and block the drive wheels before performing this procedure in order to prevent bodily injury.

  1. Ignition - On/Vehicle - In Service Mode
  2. Transmission Range - P
  3. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 0.6 to 1.0 V
    • If not between 0.6 and 1.0 V 

      Refer to: Circuit/System Testing

    • Go to next step: If between 0.6 and 1.0 V 
  4. Engine - Running
  5. Transmission Range - D
  6. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 1.7 to 2.2 V
    • If not between 1.7 and 2.2 V 

      Refer to: Circuit/System Testing

    • Go to next step: If between 1.7 and 2.2 V 
  7. 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 the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  8. All OK.