What does code P2340 mean?

Q: What does code P2340 mean?

Cylinder #5 Above Knock Threshold. P2340 means the engine control module has detected that cylinder number five is producing abnormal combustion noise, or knock, that exceeds the threshold the manufacturer programmed for that cylinder. The computer uses the knock sensor signal to identify which cylinder is knocking and sets this code when cylinder five consistently crosses that limit, which usually points to a mechanical, fuel, or ignition problem specific to that cylinder.

DTC codes / P23xx · Ignition system and misfire / P2340

P2340Cylinder #5 Above Knock Threshold

P2340 means the engine control module has detected that cylinder number five is producing abnormal combustion noise, or knock, that exceeds the threshold the manufacturer programmed for that cylinder. The computer uses the knock sensor signal to identify which cylinder is knocking and sets this code when cylinder five consistently crosses that limit, which usually points to a mechanical, fuel, or ignition problem specific to that cylinder.

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.