Drive with caution — fix soon.
This code means the transmission fluid temperature sensor circuit is showing a voltage that's too high, which the computer reads as an impossibly hot or open-circuit signal. Since the value isn't believable, the transmission may default to a protective shift strategy. It's commonly caused by an open or broken wire, a disconnected or corroded connector, or a failed sensor, and is usually fixable without major transmission work.
$150 – $400
Varies by vehicle and root cause.
Usually yes for short trips, but don't put off the repair. The computer is reading an impossibly high temperature, so it can't accurately protect the transmission and may shift more cautiously. Have it checked soon to avoid undetected overheating.
Repairs generally run $150 to $400. Repairing an open wire or reseating a connector is inexpensive, while replacing the temperature sensor, especially an internal one, costs more. Finding the open circuit may add some diagnostic time.
It's moderate. It usually won't strand you, but the false high reading means the transmission's overheating safeguard isn't working, which can lead to heat damage over time. Fixing it promptly is the smart move.
A high input usually points to an open circuit, a broken or disconnected wire, or a corroded connector that interrupts the signal. The computer interprets that lost connection as an extremely high temperature, which is why the code sets even when the fluid is at a normal temperature.