What does code P21D0 mean?

Q: What does code P21D0 mean?

Cylinder 2 Injector B Circuit/Open. P21D0 indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the control circuit for cylinder 2 injector B, which is the second injector in a multi-injector arrangement for that cylinder. The PCM commands a fuel pulse but does not see the expected current flow through the injector coil, so it flags the circuit as open.

DTC codes / P21xx · Fuel and air metering / P21D0

P21D0Cylinder 2 Injector B Circuit/Open

P21D0 indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the control circuit for cylinder 2 injector B, which is the second injector in a multi-injector arrangement for that cylinder. The PCM commands a fuel pulse but does not see the expected current flow through the injector coil, so it flags the circuit as open.

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.