Drive with caution — fix soon.
This code means the engine computer detected a problem with the engine speed (RPM) input signal coming from the ignition or distributor circuit. It's commonly caused by a faulty crankshaft or distributor sensor, damaged wiring, loose connectors, or a failing distributor. Fixing it usually involves testing and replacing the sensor or repairing the wiring, and it's often resolved without major engine work.
$150 – $700
Varies by vehicle and root cause.
You can sometimes drive short term, but it's risky because the engine may stall or fail to restart. To avoid being stranded, limit your driving and get it diagnosed soon.
Repairs usually range from $150 to $700. A sensor replacement is on the lower end, while wiring repairs or distributor work can cost more.
It's moderately serious. The car may still run, but the faulty speed signal can cause stalling or starting problems that leave you stranded, so it shouldn't be ignored.
It's most often the crankshaft position sensor or, on older vehicles, the distributor pickup that reports engine speed. Wiring and connector issues in that circuit are also common culprits worth checking.