WOMS
P code powertrain Medium severity

P0712 Transmission Fluid Temperature Sensor A Circuit Low Input

The OBD2 code P0712 indicates that the transmission fluid temperature sensor A is providing a low voltage input signal, which may suggest a malfunction in the sensor or its circuit

Definition

The OBD2 code P0712 indicates that the transmission fluid temperature sensor A is providing a low voltage input signal, which may suggest a malfunction in the sensor or its circuit

Common causes

  • Faulty transmission fluid temperature sensor
  • Damaged wiring or connectors
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Poor ground connection
  • Transmission control module (TCM) issues
  • Low transmission fluid level
  • Contaminated transmission fluid

Common misdiagnoses

  • Faulty transmission control module (TCM)
  • Bad transmission fluid temperature sensor
  • Wiring issues or short circuits
  • Low transmission fluid level
  • Faulty engine control module (ECM)
  • Transmission overheating
  • Incorrect transmission fluid type
  • Faulty connectors or terminals

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 present

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the TFT sensor for any signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    If any issues are found, repair or replace the damaged wiring or connectors

  4. 4. Test the Transmission Fluid Temperature Sensor

    Resistance Check: Use a multimeter to measure the resistance of the TFT sensor. Compare the readings to the specifications provided in the vehicle’s service manual

  5. 5. Sensor Replacement

    If the sensor is out of specification, it may need to be replaced

  6. 6. Check the Transmission Fluid Level and Condition

    Fluid Level: Ensure that the transmission fluid is at the correct level. Low fluid levels can affect sensor readings

  7. 7. Fluid Condition

    Check the condition of the transmission fluid. If it is dirty or burnt, consider changing it

  8. 8. Inspect the Transmission Control Module (TCM)

    Connections: Check the TCM for proper connections and any signs of damage

  9. 9. Software Updates

    Ensure that the TCM has the latest software updates, as manufacturers may release updates to address known issues

  10. 10. Perform a Voltage Check

    Power Supply: Check the voltage supply to the TFT sensor. It should typically be around 5 volts. If the voltage is low or absent, trace the wiring back to the ECM to find the issue

  11. 11. Check for Ground Issues

    Ensure that the ground connection for the TFT sensor is secure and free of corrosion. A poor ground can lead to incorrect sensor readings

  12. 12. Clear the Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Consult a Professional

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0712 code. Always refer to the specific service manual for your vehicle for detailed procedures and specifications