OBD-II Code P0710 — What It Means & How to Fix It

What Does This Error Mean?

P0710 means the transmission fluid temperature sensor circuit is not working correctly. This sensor tells the transmission control module how hot the transmission fluid is. The TCM uses this information to adjust shift timing and torque converter lockup. With a bad sensor, the transmission may shift incorrectly or not enter lockup mode. You may also notice harsh shifts, delayed engagement, or the transmission going into a protective mode.

Affected Models

All vehicles 1996+ with automatic transmission
Common in GM cars and trucks
Common in Ford vehicles
Common in Chrysler, Dodge, and Jeep vehicles
Common in Toyota and Nissan vehicles

Common Causes

Faulty transmission fluid temperature sensor sending an out-of-range signal
Damaged or corroded wiring to the temperature sensor
Low or dirty transmission fluid causing abnormal temperature readings
Corroded sensor connector inside or outside the transmission
Internal transmission control module fault (rare)

How to Fix It

Check the transmission fluid level and condition first. Low or burnt fluid (dark brown or black color with a burnt smell) can cause temperature sensor anomalies.

Transmission fluid is typically checked with the engine warm and running in Park or Neutral using a dipstick — check your owner's manual for the procedure.
Connect a scan tool and check the transmission fluid temperature reading. At a normal operating temperature (after a short drive), it should read 150 to 200°F (65 to 93°C). A reading that is frozen at one value or wildly out of range indicates a faulty sensor.

If the sensor reads -40°F or 300°F+ at all times, the circuit is open or shorted.
Locate the transmission fluid temperature sensor. On many vehicles, it is inside the transmission oil pan. On others, it may be an external sensor on the transmission housing.

If the sensor is internal, you will need to drop the transmission pan to access it — a good time to change the fluid and filter.
Inspect the external wiring connector at the transmission. Look for corrosion, bent pins, or damaged wiring. This is the most accessible check before dropping the pan.

Transmission harness connectors are exposed to heat, fluid, and road grime — all of which accelerate corrosion.
Replace the temperature sensor if confirmed faulty. Change the transmission fluid and filter at the same time if the pan was dropped. Clear the code and test drive.

After the repair, verify shifting is smooth and that torque converter lockup engages properly at highway speed.

When to Call a Professional

Transmission fluid temperature sensor replacement is a moderate DIY job. Sensors typically cost $20 to $80 depending on the vehicle. Many sensors are located inside the transmission pan — a fluid change is needed at the same time. Labor at a shop is $100 to $250 including the fluid and filter change. If the transmission is shifting poorly due to this code, get it inspected soon to avoid accelerating wear.

Frequently Asked Questions

Can P0710 damage my transmission?

If the sensor failure causes the transmission to shift at the wrong times or skip protective modes, it can accelerate wear. Transmissions that overheat and do not trigger a protective shutdown can suffer permanent damage. Get this fixed promptly — transmission repairs are expensive.

What does the transmission temperature sensor do exactly?

It measures how hot the transmission fluid is inside the transmission. At normal temperature, the TCM adjusts shift points for smooth performance. When fluid gets too hot, the TCM may lock the converter, increase line pressure, or prevent certain gear ranges. These protections only work if the sensor is functioning.

Should I change the transmission fluid when fixing P0710?

If the sensor is inside the pan — yes, absolutely. Dropping the pan is the only way to access the sensor, and it is not worth putting old fluid back in. Change the fluid and filter at the same time. Fresh fluid is always good for transmission health.