Drive with caution — fix soon.
This code means the transmission fluid temperature sensor circuit isn't working correctly, so the computer can't reliably read how hot the transmission fluid is. Without an accurate temperature reading, the transmission may default to a protective shift strategy and you lose your overheating safeguard. It's typically caused by a bad temperature sensor, wiring or connector issues, and is often a straightforward fix once the fault is found.
$150 – $400
Varies by vehicle and root cause.
Usually yes for the short term, but don't make it a habit. The car loses its accurate transmission temperature reading, so it can't warn you of overheating, which is the biggest risk to your transmission. Get it looked at soon to stay safe.
Repairs typically range from $150 to $400. Replacing the temperature sensor or repairing wiring is usually affordable, though some vehicles bury the sensor inside the transmission, which raises labor. A flush of contaminated fluid may add a bit more.
It's moderate. The fault itself won't strand you right away, but losing the overheating warning means the transmission could get too hot without you knowing. Fixing it promptly protects against expensive transmission damage.
It measures how hot your transmission fluid is so the computer can adjust shift timing and torque converter lockup, and warn you if things overheat. When its signal is faulty, the transmission often shifts more conservatively to protect itself.