Transmission Fluid Temperature Sensor A Circuit Malfunction
The P0710 code indicates a malfunction in the transmission fluid temperature (TFT) sensor circuit. This sensor monitors the temperature of the transmission fluid and sends a voltage signal to the powertrain control module (PCM). The PCM uses this data to adjust shift timing, line pressure, and torque converter lockup. A circuit malfunction can be caused by a faulty sensor, damaged wiring, or a poor electrical connection. Driving with this code may lead to harsh shifting, overheating, or transmission damage.
01. Most Common Causes
- Faulty transmission fluid temperature sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Open or short circuit in the sensor signal or ground wire
- Low transmission fluid level or contaminated fluid
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or overheating
- Reduced fuel economy
- Transmission stuck in limp mode or failsafe mode
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional transmission-related codes.
Step 2: Inspect the transmission fluid level and condition; top off or replace if necessary.
Step 3: Visually check the TFT sensor wiring and connector for damage, corrosion, or loose connections.
Step 4: Test the TFT sensor resistance with a multimeter and compare to manufacturer specifications.
Step 5: Check for continuity and shorts in the sensor circuit between the sensor and PCM.
Step 6: If all else is normal, replace the TFT sensor and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a faulty TFT sensor can cause transmission overheating, erratic shifting, and potential internal damage. If the transmission enters limp mode, you may lose high gears. Have it diagnosed promptly.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150 for parts and labor. A new TFT sensor costs $20-$60, and labor is usually 0.5-1 hour. If wiring repairs are needed, costs may be higher.