WOMS
U code network High severity

U1716 U1716: Transmission Control Module Communication Error

The OBD2 code U1716 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 U1716 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 programming errors
  • Low transmission fluid levels
  • Faulty sensors related to transmission operation
  • Corroded or shorted circuits

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Wiring issues or damaged connectors
  • Faulty Engine Control Module (ECM)
  • Low transmission fluid levels
  • Transmission solenoid issues
  • Faulty sensors (e.g., speed sensors)
  • Software or firmware issues in the TCM
  • Battery or charging system problems
  • Grounding issues
  • Corroded or loose electrical connections

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 for the issue

  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. Connector Pins

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

  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 secure and free of corrosion

  6. 6. Inspect the TCM

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

  7. 7. Reprogramming

    If applicable, consider reprogramming or updating the TCM software, as a software glitch can sometimes cause communication errors

  8. 8. Scan Tool Communication

    Communication Check: Use a scan tool to check if you can communicate with the TCM. If you cannot, it may indicate a problem with the TCM itself or the communication lines

  9. 9. Other Modules

    Check if other modules in the vehicle can communicate properly. If they cannot, it may indicate a broader communication issue

  10. 10. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring harness that connects to the TCM. Look for shorts to ground or power

  11. 11. Inspect the Transmission

    If the TCM is not receiving signals from the transmission sensors (like speed sensors), it may cause communication errors. Inspect these sensors and their connections

  12. 12. Clear Codes and Test Drive

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

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment

  14. 14. Replacement

    If all else fails and the TCM is determined to be faulty, consider replacing the TCM. Ensure that the replacement part is compatible with your vehicle.Conclusion Always refer to the vehicle’s service manual for specific diagnostic procedures and specifications. Following these steps can help you identify and resolve the U1716 code effectively