What does code P21E3 mean?

Q: What does code P21E3 mean?

Cylinder 4 Injector B Circuit High. P21E3 indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for cylinder 4 injector B, which usually points to an open circuit or a short to voltage on the driver side of the injector coil. The computer expects the circuit to pull low when the injector is commanded on, but the voltage stays high, so the injector may not fire at all.

DTC codes / P21xx · Fuel and air metering / P21E3

P21E3Cylinder 4 Injector B Circuit High

P21E3 indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for cylinder 4 injector B, which usually points to an open circuit or a short to voltage on the driver side of the injector coil. The computer expects the circuit to pull low when the injector is commanded on, but the voltage stays high, so the injector may not fire at all.

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.