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DTC codes / P21xx · Fuel and air metering / P21E1

P21E1Cylinder 3 Injector B Circuit High

P21E1 indicates that the engine control module has detected an abnormally high voltage on the control circuit for cylinder 3 injector B, which usually points to an open circuit or a short to power rather than a faulty injector itself. The computer monitors the injector driver circuit and sets this code when the voltage exceeds the expected range for the commanded injector pulse.

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.

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