What does code P0338 mean?

Q: What does code P0338 mean?

Crankshaft Position Sensor A Circuit High Input. P0338 means the engine computer has detected an abnormally high voltage on the signal circuit from the crankshaft position sensor, which it uses to determine engine speed and piston position. The sensor normally produces a fluctuating AC signal or a square wave, and a high input tells the computer the circuit is open, shorted to power, or the sensor has failed internally.

DTC codes / P03xx · Ignition system and misfire / P0338

P0338Crankshaft Position Sensor A Circuit High Input

P0338 means the engine computer has detected an abnormally high voltage on the signal circuit from the crankshaft position sensor, which it uses to determine engine speed and piston position. The sensor normally produces a fluctuating AC signal or a square wave, and a high input tells the computer the circuit is open, shorted to power, or the sensor has failed internally.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.