What does code P2338 mean?

Q: What does code P2338 mean?

Cylinder #3 Above Knock Threshold. P2338 indicates that the engine control module has detected an abnormal knock signal from cylinder number three that exceeds the calibrated knock threshold. The computer uses a knock sensor to listen for detonation, and this code means the signal from that cylinder is stronger than expected, which can be caused by actual detonation or by a faulty sensing circuit.

DTC codes / P23xx · Ignition system and misfire / P2338

P2338Cylinder #3 Above Knock Threshold

P2338 indicates that the engine control module has detected an abnormal knock signal from cylinder number three that exceeds the calibrated knock threshold. The computer uses a knock sensor to listen for detonation, and this code means the signal from that cylinder is stronger than expected, which can be caused by actual detonation or by a faulty sensing circuit.

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.