What does code P2051 mean?

Q: What does code P2051 mean?

Reductant Injector Circuit Low (Bank 2 Unit 1). P2051 means the engine control module has detected an abnormally low current flow in the reductant injector circuit for bank 2 unit 1, which is part of the diesel exhaust fluid injection system. The computer expects a specific current draw when it commands the injector, and a reading below the threshold indicates an open circuit, high resistance, or a failed injector coil.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2051

P2051Reductant Injector Circuit Low (Bank 2 Unit 1)

P2051 means the engine control module has detected an abnormally low current flow in the reductant injector circuit for bank 2 unit 1, which is part of the diesel exhaust fluid injection system. The computer expects a specific current draw when it commands the injector, and a reading below the threshold indicates an open circuit, high resistance, or a failed injector coil.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.