What does code P21E9 mean?

Q: What does code P21E9 mean?

Cylinder 7 Injector B Circuit High. P21E9 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for cylinder 7 injector B, which usually points to an open circuit or a short to voltage on that driver wire. The PCM commands the injector to open and close by grounding the circuit, so a high-voltage reading means the circuit is not completing the path to ground as expected.

DTC codes / P21xx · Fuel and air metering / P21E9

P21E9Cylinder 7 Injector B Circuit High

P21E9 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for cylinder 7 injector B, which usually points to an open circuit or a short to voltage on that driver wire. The PCM commands the injector to open and close by grounding the circuit, so a high-voltage reading means the circuit is not completing the path to ground as expected.

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.