What does P0712 mean?
This code comes from the transmission control system. The fluid temperature sensor signal is shorted low (reads very hot).
The computer is seeing a signal voltage that is lower than the sensor should ever produce, so it is almost always an electrical problem rather than a mechanical one.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Harsh, late or erratic shifting
- Transmission stuck in one gear (limp mode)
- Flare between gears
Common causes
- Open in the 5 V reference wire
- Signal wire shorted to ground
- Unplugged or corroded connector
- Failed sensor
How to diagnose P0712
- With the key on, back-probe the connector: you should see about 5 V on the reference wire and a good ground (under 0.1 V drop).
- If reference and ground are good, check the signal wire for a short to ground with the connector unplugged.
- If the wiring checks out, the sensor itself is the likely fault.
- Check fluid level and condition using the correct procedure for your transmission.
- Read codes from the transmission module itself, not just the engine computer.
How to fix it
- Correct the fluid level and service the fluid
- Repair wiring
- Replace the solenoid or valve body
- Repair or replace the transmission if worn
Estimated repair cost
Likely repairs for P0712 run from about $150 to $5,500, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Transmission fluid and filter service | $150 - $400 |
| Transmission solenoid / solenoid pack | $300 - $900 |
| Transmission rebuild or reman unit | $2,500 - $5,500 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0712?
High severity
Limp mode often locks the transmission in one gear. Drive gently and only as far as the shop.
P0712 FAQ
What does P0712 mean?
P0712 stands for "Transmission Fluid Temperature Sensor "A" Circuit Low". This code comes from the transmission control system.
Can I drive with a P0712 code?
Limp mode often locks the transmission in one gear. Drive gently and only as far as the shop.
How much does it cost to fix P0712?
It depends on the cause. The likely repairs for P0712 range from about $150 to $5,500 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0712?
The most common causes are: open in the 5 V reference wire; signal wire shorted to ground; unplugged or corroded connector.