U1717 – Transmission Control Module Communication Error

The ODBII code U1717 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.

The severity of ODBII code U1717 is moderate.

Common Causes For: U1716 U1716: Transmission Control Module Communication Error

• Faulty Transmission Control Module (TCM)
• Damaged wiring or connectors
• Poor ground connections
• Failed or malfunctioning Engine Control Module (ECM)
• Corrupted software or firmware in the TCM
• Low battery voltage or electrical issues
• Faulty CAN bus communication
• Intermittent connection issues
• Aftermarket modifications or installations affecting communication

Common misdiagnosis for U1717 U1717: 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 problems
• Faulty sensors (e.g., speed sensors)
• Software issues or need for reprogramming
• Battery or charging system problems
• Grounding issues
• Other communication errors in the vehicle’s network

Common Troubleshooting Steps

The OBD-II code U1717 indicates a communication error between the Transmission Control Module (TCM) and other control modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring harness and connectors associated with the TCM. Look for signs of damage, corrosion, or loose connections.
• Ensure that all connectors are securely plugged in and that there are no bent pins.
• Check Power and Ground:
• Verify that the TCM is receiving the correct voltage and ground. Use a multimeter to check the power supply and ground connections to the TCM.
• If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts.
• Inspect the TCM:
• If the wiring and connections are intact, the TCM itself may be faulty. Check for any signs of physical damage or water intrusion.
• If possible, test the TCM in another vehicle of the same make and model to see if it functions correctly.
• Check for Software Updates:
• Sometimes, communication issues can be resolved with a software update. Check with the manufacturer or a dealership to see if there are any updates available for the TCM.
• Scan for Communication Issues:
• Use a professional-grade scan tool to check for communication issues between the TCM and other modules. This can help identify if the problem is isolated to the TCM or if other modules are also affected.
• Inspect the CAN Bus:
• The TCM communicates with other modules via the Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens.
• Use an oscilloscope or a CAN bus diagnostic tool to monitor the communication signals on the bus.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1717 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that can help in troubleshooting.
• Seek Professional Help:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission control systems. By following these steps, you should be able to identify and resolve the communication error associated with the U1717 code.