What does code P21E8 mean?

Q: What does code P21E8 mean?

Cylinder 7 Injector B Circuit Low. P21E8 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for cylinder 7 injector B, which is the second injector assigned to that cylinder in a multi-injector or staged injection system. The PCM monitors the circuit and sets this code when the voltage on the control wire falls below the expected threshold, typically indicating a short to ground or an open circuit.

DTC codes / P21xx · Fuel and air metering / P21E8

P21E8Cylinder 7 Injector B Circuit Low

P21E8 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for cylinder 7 injector B, which is the second injector assigned to that cylinder in a multi-injector or staged injection system. The PCM monitors the circuit and sets this code when the voltage on the control wire falls below the expected threshold, typically indicating a short to ground or an open 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.