What does code P21EB mean?

Q: What does code P21EB mean?

Cylinder 8 Injector B Circuit High. P21EB indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for fuel injector B on cylinder 8, which usually means the circuit is open or shorted to voltage rather than the injector being commanded to fire. The computer monitors the injector driver circuit and flags this code when the voltage on the control side exceeds the expected threshold for the commanded state.

DTC codes / P21xx · Fuel and air metering / P21EB

P21EBCylinder 8 Injector B Circuit High

P21EB indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for fuel injector B on cylinder 8, which usually means the circuit is open or shorted to voltage rather than the injector being commanded to fire. The computer monitors the injector driver circuit and flags this code when the voltage on the control side exceeds the expected threshold for the commanded state.

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.