DTC codes / P23xx · Ignition system and misfire / P23FB
P23FB indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 10, specifically for injector circuit B, which usually refers to a secondary injector or a specific driver circuit within a multi-injector arrangement. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify that cylinder 10 is not contributing its expected share of power, often due to a fuel delivery or combustion quality issue.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.