What does code P21D3 mean?

Q: What does code P21D3 mean?

Cylinder 5 Injector B Circuit/Open. P21D3 indicates that the powertrain control module has detected an open circuit or excessive resistance in the control circuit for cylinder 5 injector B, which is the second injector assigned to that cylinder on engines using multiple injectors per cylinder. The computer monitors the commanded injector current and flags this code when the expected electrical load is not present, meaning the injector cannot deliver fuel as commanded.

DTC codes / P21xx · Fuel and air metering / P21D3

P21D3Cylinder 5 Injector B Circuit/Open

P21D3 indicates that the powertrain control module has detected an open circuit or excessive resistance in the control circuit for cylinder 5 injector B, which is the second injector assigned to that cylinder on engines using multiple injectors per cylinder. The computer monitors the commanded injector current and flags this code when the expected electrical load is not present, meaning the injector cannot deliver fuel as commanded.

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.