WOMS
U code network High severity

U2739 Invalid Data Received from the Transmission Control Module (TCM)"

The OBD2 code U2739 indicates that the vehicle's control module has received invalid or corrupted data from the Transmission Control Module (TCM), which may affect transmission performance

Definition

The OBD2 code U2739 indicates that the vehicle's control module has received invalid or corrupted data from the Transmission Control Module (TCM), which may affect transmission performance

Common causes

  • Faulty Transmission Control Module (TCM)
  • Poor electrical connections or wiring issues
  • Corrupted software or firmware in the TCM
  • Faulty sensors related to the transmission
  • Issues with the vehicle's powertrain control module (PCM)
  • Low transmission fluid levels or fluid contamination
  • Malfunctioning CAN bus communication
  • Grounding issues in the electrical system

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Wiring issues or short circuits in the transmission harness
  • Faulty Engine Control Module (ECM)
  • Incorrectly calibrated or programmed TCM
  • Sensor malfunctions (e.g., speed sensors)
  • Transmission fluid issues (e.g., low fluid, contamination)
  • Faulty connectors or terminals
  • Software glitches or updates needed in the TCM
  • Issues with the vehicle's CAN bus communication
  • Mechanical transmission problems

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 Wiring and Connectors

    Visual Inspection: Check the wiring and connectors between the TCM and the Engine Control Module (ECM) for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent or corroded

  4. 4. Check for Software Updates

    Verify if there are any software updates available for the TCM or ECM. Manufacturers sometimes release updates to fix known issues

  5. 5. Inspect the TCM

    Physical Condition: Check the TCM for any signs of physical damage or water intrusion

  6. 6. Functionality

    If possible, test the TCM to ensure it is functioning correctly. This may require specialized equipment or professional assistance

  7. 7. Check Power and Ground

    Ensure that the TCM is receiving the correct power and ground signals. Use a multimeter to check voltage and ground continuity

  8. 8. Scan for Communication Issues

    Use a scan tool to monitor the communication between the TCM and other modules. Look for any communication errors or interruptions

  9. 9. Inspect Related Components

    Check other components that may affect the TCM, such as the transmission itself, sensors (like the vehicle speed sensor), and wiring harnesses

  10. 10. Clear Codes and Test Drive

    After performing inspections and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code reappears

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented solutions for common issues

  12. 12. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have access to advanced diagnostic tools and resources.Conclusion Troubleshooting OBD-II code U2739 involves a systematic approach to identify and resolve issues related to the TCM and its communication with other vehicle systems. Always ensure safety and follow manufacturer guidelines when performing any repairs or inspections