What does code P21CF mean?

Q: What does code P21CF mean?

Cylinder 1 Injector B Circuit/Open. P21CF indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the control circuit for cylinder 1 injector B, which is the second injector assigned to that cylinder on engines using multiple injectors per cylinder. The PCM monitors the injector driver circuit and sets this code when the expected current flow is absent or out of range during commanded injection events.

DTC codes / P21xx · Fuel and air metering / P21CF

P21CFCylinder 1 Injector B Circuit/Open

P21CF indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the control circuit for cylinder 1 injector B, which is the second injector assigned to that cylinder on engines using multiple injectors per cylinder. The PCM monitors the injector driver circuit and sets this code when the expected current flow is absent or out of range during commanded injection events.

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.