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U1714U1714: Transmission Control Module Communication Error

The OBD2 code U1714 indicates a communication error between the Transmission Control Module (TCM) and other control modules in the vehicle, suggesting a potential issue with data transmission or connectivity

Definition

The OBD2 code U1714 indicates a communication error between the Transmission Control Module (TCM) and other control modules in the vehicle, suggesting a potential issue with data transmission or connectivity

Common causes

  • Faulty Transmission Control Module (TCM)
  • Damaged wiring or connectors
  • Poor electrical connections
  • Failed or malfunctioning engine control module (ECM)
  • Software issues or bugs in the TCM
  • Low transmission fluid levels
  • Corroded or shorted circuits
  • Faulty sensors related to transmission operation
  • Issues with the vehicle's battery or charging system
  • Interference from aftermarket modifications or devices

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Wiring or connector issues
  • Faulty Engine Control Module (ECM)
  • Transmission fluid issues
  • Sensor malfunctions (e.g., speed sensors)
  • Battery or charging system problems
  • Software or firmware issues in the TCM or ECM
  • Grounding issues in the electrical system

Troubleshooting steps

  1. 1.Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Addressing other related codes may help resolve the U1714 code

  2. 2.Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the TCM for any signs of damage, corrosion, or loose connections

  3. 3.Repair or Replace

    Repair any damaged wires or connectors and ensure all connections are secure

  4. 4.Check Power and Ground

    Power Supply: Verify that the TCM is receiving the correct voltage. Use a multimeter to check the power supply to the TCM

  5. 5.Ground Connections

    Ensure that the ground connections for the TCM are clean and secure

  6. 6.Inspect the TCM

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

  7. 7.Reprogramming

    If the TCM is suspected to be faulty, consider reprogramming or updating the software if applicable

  8. 8.Check for Communication Issues

    CAN Bus: Inspect the Controller Area Network (CAN) bus for any faults. Use a scan tool to monitor communication between modules

  9. 9.Termination Resistors

    Ensure that the CAN bus termination resistors are present and functioning correctly

  10. 10.Test the TCM

    If possible, test the TCM in another vehicle of the same make and model to determine if the module is functioning correctly

  11. 11.Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12.Consult Technical Service Bulletins (TSBs)

    Check for any manufacturer-specific TSBs related to the U1714 code or TCM communication issues. There may be known fixes or updates available

  13. 13.Seek Professional Help

    If the issue persists after performing the above steps, consider consulting a professional mechanic or dealership for further diagnosis and repair.Conclusion Troubleshooting a U1714 code involves a systematic approach to check for wiring issues, power supply, ground connections, and the functionality of the TCM itself. Following these steps can help identify and resolve the communication error effectively