U2739 – Invalid Data Received from the Transmission Control Module (TCM).
The ODBII 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.
The severity of ODBII code U2739 is generally considered moderate to severe.
Common Causes For: U2738 Vehicle Communication Bus Malfunction
- 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 misdiagnosis for U2739 Invalid Data Received from the Transmission Control Module (TCM)”.
- 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
Common Troubleshooting Steps
When dealing with the OBD-II code U2739, which indicates “Invalid Data Received from the Transmission Control Module (TCM),” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:
- 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.
- 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.
- **Connector Pins: Ensure that the pins in the connectors are not bent or corroded.
- 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.
- Inspect the TCM: **Physical Condition: Check the TCM for any signs of physical damage or water intrusion.
- **Functionality: If possible, test the TCM to ensure it is functioning correctly. This may require specialized equipment or professional assistance.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.