Drive with caution — fix soon.
This code means the transmission control module detected a malfunction in the engine speed input circuit, so it isn't getting a reliable RPM signal to coordinate gear shifts. It's commonly caused by a faulty crankshaft position or input speed sensor, wiring problems, or a communication fault between the engine and transmission modules. Repairs usually start with testing and replacing the suspect sensor, and it's often fixable without major transmission work.
$150 – $500
Varies by vehicle and root cause.
Usually yes for a while, but you may feel rough or delayed shifts. Get it checked soon to keep the problem from worsening and to avoid limp mode.
Most repairs fall between $150 and $500, depending on the sensor involved and any wiring work. Transmission control module issues can raise the cost.
It's moderately serious. It affects shift timing and can cause limp mode, but it usually isn't an immediate safety risk if you have it addressed promptly.
It's typically tied to the engine speed signal, which often comes from the crankshaft position sensor or an input speed sensor that the transmission relies on to time shifts.