What does code P21EA mean?

Q: What does code P21EA mean?

Cylinder 8 Injector B Circuit Low. P21EA indicates that the powertrain control module (PCM) has detected an abnormally low voltage on the control circuit for fuel injector B in cylinder 8, which typically means the circuit is shorted to ground or the injector's internal coil has failed. The PCM commands a precise pulse width to the injector, and when the feedback voltage stays below the expected threshold, it flags this code and may disable the injector to protect the driver circuit.

DTC codes / P21xx · Fuel and air metering / P21EA

P21EACylinder 8 Injector B Circuit Low

P21EA indicates that the powertrain control module (PCM) has detected an abnormally low voltage on the control circuit for fuel injector B in cylinder 8, which typically means the circuit is shorted to ground or the injector's internal coil has failed. The PCM commands a precise pulse width to the injector, and when the feedback voltage stays below the expected threshold, it flags this code and may disable the injector to protect the driver circuit.

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.