WOMS
P code powertrain High severity

P079E Transmission Friction Element "E" Slip Detected

The OBD2 code P079E indicates that the transmission control module has detected a slip condition in the friction element "E," which may suggest issues with the transmission's ability to engage or maintain proper...

Definition

The OBD2 code P079E indicates that the transmission control module has detected a slip condition in the friction element "E," which may suggest issues with the transmission's ability to engage or maintain proper pressure in that specific friction element, potentially leading to transmission performance problems

Common causes

  • Worn or damaged transmission components
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Faulty transmission control module (TCM)
  • Malfunctioning solenoid or actuator
  • Electrical issues (wiring or connectors)
  • Incorrect transmission fluid type
  • Software issues or updates needed in the TCM
  • Mechanical binding or sticking of friction elements
  • Overheating of the transmission system

Common misdiagnoses

  • Transmission fluid issues (low level, contamination)
  • Faulty transmission control module (TCM)
  • Worn or damaged transmission components
  • Incorrectly calibrated or malfunctioning sensors
  • Electrical issues (wiring, connectors)
  • Software or firmware issues in the transmission system
  • Engine performance problems affecting transmission operation
  • Torque converter issues
  • Clutch pack wear or failure
  • Misinterpretation of other transmission codes

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2. Inspect Transmission Fluid

    Fluid Level: Check the transmission fluid level. Low fluid can cause slipping

  3. 3. Fluid Condition

    Inspect the fluid for contamination, burning smell, or dark color. If the fluid is dirty or burnt, it may need to be changed

  4. 4. Examine Transmission Components

    Clutch Pack: Inspect the clutch pack associated with Friction Element "E" for wear or damage

  5. 5. Solenoids

    Check the transmission solenoids for proper operation. A malfunctioning solenoid can lead to improper engagement of the friction elements

  6. 6. Check for Mechanical Issues

    Worn Components: Look for any signs of wear in the transmission components, such as gears, bearings, or seals

  7. 7. Transmission Mounts

    Ensure that the transmission mounts are secure and not damaged, as this can affect alignment and operation

  8. 8. Inspect Electrical Connections

    Wiring and Connectors: Check the wiring and connectors related to the transmission control module and solenoids for damage, corrosion, or loose connections

  9. 9. Test the TCM

    If all other components appear to be functioning correctly, the Transmission Control Module itself may be faulty. Testing or reprogramming the TCM may be necessary

  10. 10. Perform a Transmission Fluid Change

    If the fluid is old or contaminated, a fluid change may help improve performance. Ensure to use the manufacturer-recommended fluid

  11. 11. Road Test

    After performing checks and repairs, conduct a road test to see if the issue persists. Monitor the transmission's behavior during different driving conditions

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to your vehicle's make and model that may address known issues with the transmission

  13. 13. Seek Professional Help

    If the problem persists after performing these steps, it may be best to consult a professional mechanic or transmission specialist for further diagnosis and repair.Conclusion Addressing a P079E code requires a systematic approach to identify the root cause of the slip condition. Regular maintenance and timely repairs can help prevent transmission issues and prolong the life of the vehicle