What does code P2351 mean?

Q: What does code P2351 mean?

Cylinder 9 Combustion Performance. P2351 indicates that the engine control module (ECM) has detected a combustion quality problem specifically on cylinder number 9, typically by monitoring crankshaft speed fluctuations or ionization current. The ECM compares the power contribution of cylinder 9 against the other cylinders and sets this code when the imbalance exceeds a calibrated threshold.

DTC codes / P23xx · Ignition system and misfire / P2351

P2351Cylinder 9 Combustion Performance

P2351 indicates that the engine control module (ECM) has detected a combustion quality problem specifically on cylinder number 9, typically by monitoring crankshaft speed fluctuations or ionization current. The ECM compares the power contribution of cylinder 9 against the other cylinders and sets this code when the imbalance exceeds a calibrated threshold.

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.