What does code P21F1 mean?

Q: What does code P21F1 mean?

Cylinder 11 Injector B Circuit High. P21F1 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the fuel injector in cylinder 11, designated as injector B. This high voltage suggests the circuit is open, shorted to power, or the injector coil is faulty, preventing proper fuel delivery to that cylinder.

DTC codes / P21xx · Fuel and air metering / P21F1

P21F1Cylinder 11 Injector B Circuit High

P21F1 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the fuel injector in cylinder 11, designated as injector B. This high voltage suggests the circuit is open, shorted to power, or the injector coil is faulty, preventing proper fuel delivery to that cylinder.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.