U1715 – Transmission Control Module Communication Error

The ODBII code U1715 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 U1715 is moderate to severe.

Common Causes For: U1714 U1714: Transmission Control Module Communication Error

• Faulty Transmission Control Module (TCM)
• Damaged wiring or connectors
• Poor ground connections
• Faulty Engine Control Module (ECM)
• Software issues or bugs
• Corroded terminals
• Low battery voltage
• Faulty CAN bus communication
• Intermittent electrical connections
• Malfunctioning sensors related to transmission

Common misdiagnosis for U1715 U1715: Transmission Control Module Communication Error

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

Common Troubleshooting Steps

The OBD-II code U1715 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 related to the TCM for any signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors at the TCM and any junction points in the wiring.
• Check Power and Ground:
• Verify that the TCM is receiving the correct power supply. Use a multimeter to check the voltage at the TCM connector.
• Ensure that the ground connections for the TCM are secure and free of corrosion.
• Test the TCM:
• If possible, test the TCM for proper operation. This may involve using specialized diagnostic equipment or swapping in a known good TCM if available.
• 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 a scan tool to monitor the CAN bus for communication errors.
• Check for Software Updates:
• Sometimes, a software update for the TCM or other related modules can resolve communication issues. Check with the manufacturer for any available updates.
• 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.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures related to the TCM and communication errors. This can provide additional insights and steps tailored to your vehicle model.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing transmission and communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U1715 code.