How much does it cost to fix P0712?

DIY repair typically costs $15–$80 for parts. Professional repair runs $100–$350 including parts and labor.

P0712

Powertrain

Moderate

Transmission Fluid Temperature Sensor "A" Circuit Low Input

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The P0712 code means the PCM is detecting an abnormally low voltage signal from the transmission fluid temperature sensor. Because the TFT sensor uses a negative temperature coefficient (NTC) thermistor, low resistance (and therefore low voltage at the PCM) corresponds to a very high temperature reading. The PCM interprets this as the transmission fluid being extremely hot, even though it may not be.

When the PCM believes the fluid is overheated, it will adjust transmission operation accordingly — often engaging the torque converter clutch earlier, shifting to higher gears sooner, and potentially activating limp mode. You may notice the transmission feels sluggish from a stop, shifts harshly, or won't downshift properly. The transmission temperature warning light may also illuminate on vehicles equipped with one.

The most common cause is a short circuit in the wiring between the sensor and the PCM, or a failed sensor with an internal short. Start by inspecting the wiring and connector for damage, corrosion, or moisture intrusion. If the wiring checks out, replace the TFT sensor. The sensor itself is typically inexpensive ($15–$80), and on many vehicles is accessible near the transmission oil pan or on the valve body. Address this code promptly, as the altered shift strategy can increase wear on transmission components.

Severity

Moderate — Address SoonThis Week

Symptoms

•Harsh or delayed gear shifts
•Transmission stuck in a high gear
•Poor acceleration from a stop
•Torque converter clutch engages too early
•Check engine light illuminated
•Reduced fuel economy

Likely Causes

Short circuit in the TFT sensor wiring40%

A short to ground in the sensor circuit produces an abnormally low voltage reading, which the PCM interprets as an extremely high transmission fluid temperature (thermistors have inverse resistance).

Faulty transmission fluid temperature sensor30%

An internally shorted TFT sensor will produce a consistently low resistance reading, sending a low voltage signal to the PCM regardless of actual fluid temperature.

Corroded or water-damaged connector20%

Moisture intrusion into the sensor connector can create a low-resistance path to ground, pulling the signal voltage below the expected range.

Transmission fluid leak causing sensor exposure10%

If fluid has leaked from the sensor area, it can damage wiring insulation and create shorts. The leak itself may have also caused the sensor to read incorrectly due to insufficient fluid contact.