What does code P21E0 mean?

Q: What does code P21E0 mean?

Cylinder 3 Injector B Circuit Low. P21E0 indicates that the powertrain control module has detected an abnormally low voltage or current on the control circuit for cylinder 3 injector B, which is the second injector assigned to that cylinder in a multi-injector or staged injection system. The computer expects a specific electrical load when the injector is commanded on, and a low condition means the circuit is shorted to ground, has excessive resistance, or the injector itself has failed.

DTC codes / P21xx · Fuel and air metering / P21E0

P21E0Cylinder 3 Injector B Circuit Low

P21E0 indicates that the powertrain control module has detected an abnormally low voltage or current on the control circuit for cylinder 3 injector B, which is the second injector assigned to that cylinder in a multi-injector or staged injection system. The computer expects a specific electrical load when the injector is commanded on, and a low condition means the circuit is shorted to ground, has excessive resistance, or the injector itself has failed.

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.