What does code P0343 mean?

Q: What does code P0343 mean?

Camshaft Position Sensor A Circuit High Input. P0343 means the engine computer has detected an abnormally high voltage on the signal circuit from camshaft position sensor A, which is the sensor that tells the computer the exact position of the camshaft for fuel and ignition timing. The computer expects the sensor signal to switch between a low and high voltage as the camshaft rotates, and a continuous high reading indicates a short to voltage, an open ground, or a failed sensor.

DTC codes / P03xx · Ignition system and misfire / P0343

P0343Camshaft Position Sensor A Circuit High Input

P0343 means the engine computer has detected an abnormally high voltage on the signal circuit from camshaft position sensor A, which is the sensor that tells the computer the exact position of the camshaft for fuel and ignition timing. The computer expects the sensor signal to switch between a low and high voltage as the camshaft rotates, and a continuous high reading indicates a short to voltage, an open ground, or a failed sensor.

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.