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P code powertrain High severity

P1718 TFT Sensor In Range Failure High

The OBD2 code P1718 indicates that the Transmission Fluid Temperature (TFT) sensor is reading a high value, suggesting a potential issue with the sensor or the transmission fluid temperature

Definition

The OBD2 code P1718 indicates that the Transmission Fluid Temperature (TFT) sensor is reading a high value, suggesting a potential issue with the sensor or the transmission fluid temperature

Common causes

  • Faulty transmission fluid temperature (TFT) sensor
  • Wiring issues or damaged connectors
  • Short circuit in the TFT sensor circuit
  • Faulty transmission control module (TCM)
  • Poor electrical connections
  • Incorrect transmission fluid level or type
  • Internal transmission problems

Common misdiagnoses

  • Transmission fluid level issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty transmission fluid temperature (TFT) sensor
  • Engine control module (ECM) issues
  • Incorrect transmission fluid type
  • Transmission overheating
  • Internal transmission problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues affecting the transmission

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors associated with the TFT sensor. Look for signs of damage, corrosion, or loose connections that could affect the sensor's performance

  3. 3. Test the TFT Sensor

  4. 4. Use a multimeter to test the resistance of the TFT sensor. Compare the readings to the manufacturer's specifications. If the resistance is outside the specified range, the sensor may be faulty and need replacement

  5. 5. If possible, check the sensor's output voltage while the engine is running to see if it corresponds to the expected temperature range

  6. 6. Check Transmission Fluid Level and Condition

    Low or contaminated transmission fluid can affect the temperature readings. Ensure the fluid is at the correct level and in good condition. If the fluid is burnt or dirty, consider changing it

  7. 7. Inspect the Transmission Cooler

    A malfunctioning transmission cooler can cause overheating, leading to high temperature readings. Check for blockages or leaks in the cooler

  8. 8. Check for Overheating Issues

    If the transmission is genuinely overheating, investigate potential causes such as a failing torque converter, slipping clutches, or other internal transmission issues

  9. 9. Scan for Software Updates

    Sometimes, manufacturers release software updates that can resolve issues related to sensor readings. Check if there are any updates available for your vehicle's ECU

  10. 10. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code reappears. Monitor the TFT readings during the drive

  11. 11. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission diagnostics. By following these troubleshooting steps, you can identify and potentially resolve the issue related to the P1718 code