What does code P05F0 mean?

Q: What does code P05F0 mean?

Reductant Pump Supply Voltage Circuit High. P05F0 indicates that the reductant pump supply voltage circuit, which feeds the diesel exhaust fluid (DEF) pump, is reading higher than the manufacturer's expected range. The engine control module (ECM) monitors this circuit and sets the code when the voltage remains above the calibrated threshold for a specified time, typically indicating an open circuit, a short to voltage, or a faulty pump module.

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P05F0

P05F0Reductant Pump Supply Voltage Circuit High

P05F0 indicates that the reductant pump supply voltage circuit, which feeds the diesel exhaust fluid (DEF) pump, is reading higher than the manufacturer's expected range. The engine control module (ECM) monitors this circuit and sets the code when the voltage remains above the calibrated threshold for a specified time, typically indicating an open circuit, a short to voltage, or a faulty pump module.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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