U2718 – refers to a communication issue related to the transmission control module (TCM) in a vehicle.
The ODBII code U2718 indicates a communication issue between the transmission control module (TCM) and other control modules in the vehicle, suggesting a potential fault in the data transmission or connectivity.
The severity of ODBII code U2718 is generally considered moderate to high.
Common Causes For: U2717 Control Module Communication Bus Off.
- Faulty Transmission Control Module (TCM)
- Damaged or corroded wiring harness
- Poor electrical connections
- Faulty transmission sensors
- Software issues or outdated firmware
- Low transmission fluid levels
- Malfunctioning engine control module (ECM)
- Issues with the vehicle’s CAN bus system
- Grounding problems
- Intermittent electrical faults
Common misdiagnosis for U2718 refers to a communication issue related to the transmission control module (TCM) in a vehicle.
- Faulty Transmission Control Module (TCM)
- Wiring issues or damaged connectors
- Faulty Transmission Range Sensor
- Low transmission fluid levels
- Faulty Engine Control Module (ECM)
- Incorrectly calibrated or programmed TCM
- Faulty vehicle speed sensor
- Issues with the CAN bus communication system
- Faulty or corroded ground connections
- Malfunctioning or damaged transmission components
Common Troubleshooting Steps
The OBD-II code U2718 indicates a communication issue related to the Transmission Control Module (TCM). This code typically suggests that there is a problem with the communication between the TCM and other modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve the issue:
- Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
- Inspect Wiring and Connectors:
- Visually inspect the wiring harness and connectors associated with the TCM for any 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 power supply and ground. Use a multimeter to check voltage at the TCM connector.
- 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.
- If possible, compare the TCM with a known good unit to see if the issue persists.
- Inspect Other Modules:
- Since communication issues can involve multiple modules, check other related modules (like the Engine Control Module (ECM) or Body Control Module (BCM)) for faults or communication errors.
- Ensure that all modules are functioning correctly and that there are no communication errors between them.
- Check for Software Updates:
- Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the TCM or other related 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 reappears.
- Consult Technical Service Bulletins (TSBs):
- Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the TCM.
- Seek Professional Help:
- If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics and transmission systems. By following these troubleshooting steps, you can systematically identify and resolve the communication issue related to the TCM indicated by the U2718 code.