U1716 – Transmission Control Module Communication Error

The ODBII 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.

Moderate to severe.

Common Causes For: U1715 U1715: Transmission Control Module Communication Error

• 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 misdiagnosis for U1716 U1716: Transmission Control Module Communication Error

• 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

Common Troubleshooting Steps

When dealing with OBD-II code U1716, which indicates a Transmission Control Module (TCM) communication error, 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 for the issue.
• 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.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or damaged.
• 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.
• **Ground Connections: Ensure that the ground connections for the TCM are secure and free of corrosion.
• Inspect the TCM: **Physical Condition: Check the TCM for any signs of physical damage or water intrusion.
• **Reprogramming: If applicable, consider reprogramming or updating the TCM software, as a software glitch can sometimes cause communication errors.
• 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.
• **Other Modules: Check if other modules in the vehicle can communicate properly. If they cannot, it may indicate a broader communication issue.
• 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.
• 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.
• 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.
• 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.
• 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.