U1712 – Transmission Control Module Communication Error

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The ODBII code U1712 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 U1712 is moderate to severe.

Common Causes For: U1711 U1711: 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 U1712 U1712: Transmission Control Module Communication Error

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  • Software issues or outdated firmware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

Common Troubleshooting Steps

The OBD-II code U1712 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.
  • Test the TCM:
  • If the wiring and connections are intact, the TCM itself may be faulty. Testing the TCM may require specialized equipment or a professional diagnostic tool.
  • In some cases, reprogramming or updating the TCM software may resolve communication issues.
  • Inspect Other Modules:
  • Since the TCM communicates with other modules (like the Engine Control Module), check those modules for faults. A problem in another module can sometimes cause communication errors.
  • Look for any signs of water intrusion or damage in other control modules.
  • Check for Interference:
  • Ensure that there are no aftermarket devices or modifications that could interfere with the communication between modules.
  • 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 Technical Service Bulletins (TSBs):
  • Check for any TSBs related to the U1712 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that could help in troubleshooting.
  • Seek Professional Help:
  • If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission control systems. By following these steps, you can systematically diagnose and potentially resolve the U1712 code.

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