What Does P0710 Mean?
The transmission fluid temperature (TFT) sensor circuit A has a general malfunction. The TCM is detecting that the sensor signal is outside of the expected operating parameters, which may prevent the transmission from adjusting shift schedules and line pressure for temperature compensation. The driver may notice firm or erratic shifts, especially when cold or after prolonged driving.
Common Causes
35%
Faulty transmission fluid temperature sensor
30%
Damaged or corroded wiring or connector between sensor and TCM
15%
Low or contaminated transmission fluid affecting sensor readings
10%
TCM internal fault or poor ground
10%
Incorrect sensor installed (wrong resistance range for application)
Diagnostic Steps
1
Monitor TFT sensor reading via live data with the engine cold (after overnight soak). The reading should be close to ambient temperature (within 5-10°F). A wildly different reading indicates a sensor or circuit fault.
2
Disconnect the TFT sensor connector and measure resistance across the sensor terminals. At room temperature (~70°F), most TFT sensors read 2,000-3,000 ohms (NTC type). Compare to manufacturer specs.
3
Check the sensor connector for corrosion, spread pins, or moisture intrusion. Clean and repair as needed.
4
Verify reference voltage (typically 5V) and ground at the sensor connector with KOEO. Reference voltage should be 4.8-5.2V, ground less than 0.1V.
5
If the sensor and wiring are good, check for contaminated or severely degraded transmission fluid. Burnt or heavily oxidized fluid can affect temperature readings.
6
Warm the engine to operating temperature and monitor the TFT reading — it should climb steadily to 170-220°F during normal driving. Erratic or stuck readings confirm the sensor fault.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The transmission fluid temperature (TFT) sensor circuit A has a general malfunction. The TCM is detecting that the sensor signal is outside of the expected operating parameters, which may prevent the transmission from adjusting shift schedules and line pressure for temperature compensation. The driv...
The most common cause of P0710 (Transmission Fluid Temperature Sensor A Circuit Malfunction) is: Faulty transmission fluid temperature sensor
Typical repair costs for P0710 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven short-term, but the transmission cannot properly compensate for fluid temperature. This may cause harsh shifts when cold or allow the transmission to overheat without warning during heavy use. Avoid towing or aggressive driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0710 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
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