What does code P23FD mean?

Q: What does code P23FD mean?

Cylinder 12 Injector B Air-Fuel Ratio Imbalance. P23FD indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 12, specifically for injector circuit B, meaning the fuel delivered to that cylinder is not producing the expected exhaust oxygen content. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify that cylinder 12 is contributing disproportionately to the overall fuel trim error.

DTC codes / P23xx · Ignition system and misfire / P23FD

P23FDCylinder 12 Injector B Air-Fuel Ratio Imbalance

P23FD indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 12, specifically for injector circuit B, meaning the fuel delivered to that cylinder is not producing the expected exhaust oxygen content. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify that cylinder 12 is contributing disproportionately to the overall fuel trim error.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.