Drivable short-term, but fix now to avoid damage.
This code means the transmission control module isn't receiving an engine speed (RPM) signal it needs to manage shifts. It's usually caused by a faulty speed sensor, damaged wiring, or a poor connection between the engine and transmission controllers. In many cases it's fixable by replacing a sensor or repairing wiring without major transmission work.
$150 – $600
Varies by vehicle and root cause.
For short, low-speed trips you usually can, but it's risky. The transmission may lock into limp mode and limit your power, which is dangerous at highway speeds, so get it checked as soon as possible.
If it's a speed sensor or wiring issue, repairs typically run between $150 and $600. If the transmission control module is at fault, costs can climb higher, so an accurate diagnosis is important first.
It can be. Losing the engine speed signal interferes with shifting and may force the transmission into a protective mode, so while it's often a simple sensor fix, you shouldn't ignore it.
The transmission uses the engine RPM signal to decide when and how to shift gears. Without it, the controller can't time shifts correctly, which is why this code often causes harsh or stuck shifting.