Transmission Fluid Temperature Sensor Circuit Malfunction
There’s an issue with the transmission fluid temperature sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The temperature sensor is supposed to tell the computer how hot the transmission fluid is. If it fails, the computer can't adjust things right, which can lead to poor shifting or overheating.
What the computer is actually seeing
The transmission control module (TCM) looks for input from the temperature sensor, expecting a voltage between 0.5V (cold) to 4.5V (hot). If the voltage goes outside this range, the code triggers.
What a healthy reading looks like
Normal operating temperature for transmission fluid is between 175°F and 220°F (about 80°C to 104°C). The sensor should output a corresponding voltage that reflects this temperature range accurately.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check transmission fluid level; add if low. Decision: If low, refill and retest. If not low, proceed to step 2.
- 22. Inspect the wiring and connectors to the temperature sensor for damage or corrosion. Decision: If damaged, repair/replace and retest. If good, proceed to step 3.
- 33. Test the voltage output of the transmission fluid temperature sensor using a multimeter. Expect 0.5V at around 32°F (0°C) and up to 4.5V at 300°F (150°C). Decision: If output is out of range, replace the sensor. If within range, proceed to step 4.
- 44. Check the TCM for any software updates or faults. Decision: If an updated program is available, reflash the TCM. If no updates, replace the TCM.
Common causes
- Bad transmission fluid temperature sensor
- Wiring issues (frayed or shorted wires)
- Poor connections at the sensor or TCM
- Faulty TCM
- Low transmission fluid level
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but shifting could be erratic and overheating may occur. It's best to fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code pair with P0712?
P0712 indicates the sensor input is below the normal range, both codes relate to the transmission fluid temperature sensor issues.
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