Drivable short-term, but fix now to avoid damage.
This code means the computer is getting no signal at all from the input or turbine speed sensor, which monitors how fast the transmission's input shaft turns. Without this data, the transmission can't properly coordinate gear changes and typically enters a protective limp mode. It's usually caused by a failed sensor, broken wiring, or a bad connector, though internal transmission issues can also trigger it.
$200 – $600
Varies by vehicle and root cause.
Only briefly and gently. With no speed signal the transmission usually drops into limp mode and shifts harshly, which is hard on the drivetrain. Drive just far enough to reach a safe spot or a shop, then get it repaired right away.
Most repairs fall between $200 and $600. Replacing the speed sensor or fixing wiring is on the lower end, while internal issues like a damaged reluctor ring require dropping or opening the transmission and cost considerably more.
Yes, it's on the serious side. The transmission loses critical input speed data and goes into a protective mode, so driving normally isn't really possible and continued driving can add wear. It should be addressed promptly.
It measures how fast the transmission's input shaft (driven by the torque converter turbine) is spinning. The computer compares this to output speed to control shift timing and torque converter lockup, so when it reads nothing, the transmission can't shift intelligently.