Blown fuse or faulty relay in the reductant pump supply circuit; Open circuit, chafed wiring or high resistance in the pump supply wire; Corroded, damaged or loose connector at the pump, fuse box or control unit; Faulty reductant pump or heater/pump module drawing abnormal current or failing internally; Low battery voltage or a charging system fault affecting the supply; Faulty reductant control unit or its internal supply driver; Outdated control unit software where the manufacturer has a known fix.

P05EE

Reductant Pump Supply Voltage Circuit/Open.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
EE: FaultThe specific fault in that area

What it means

P05EE means the control unit that manages the reductant (diesel exhaust fluid) pump has detected a fault in the pump's power supply circuit, typically an open circuit or a missing or out-of-range supply voltage. The control unit monitors the supply to the pump and saw no voltage, or a voltage outside the expected range, when it should have been present. Without a working pump the selective catalytic reduction system cannot dose reductant properly. The exact pump location, fusing and supply arrangement depend on the vehicle and engine.

Symptoms

Emissions or engine warning light on
Reductant system or exhaust fluid warning message on the dashboard
Reduced engine power or limp mode on some vehicles
Countdown to a restricted start or no-restart warning on some vehicles
Reductant not being dosed, so NOx emissions rise
Other reductant system fault codes stored alongside

Possible causes

Blown fuse or faulty relay in the reductant pump supply circuitlikely
Open circuit, chafed wiring or high resistance in the pump supply wirelikely
Corroded, damaged or loose connector at the pump, fuse box or control unitlikely
Faulty reductant pump or heater/pump module drawing abnormal current or failing internallypossible
Low battery voltage or a charging system fault affecting the supplypossible
Faulty reductant control unit or its internal supply driverrare
Outdated control unit software where the manufacturer has a known fixrare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage and conditions when the fault set, and check for related reductant or battery codes
Check the battery condition and charging voltage, as low or unstable voltage can set supply circuit faults
Check the fuse and relay for the reductant pump using the vehicle wiring diagram, as the layout varies by model
Visually inspect the pump wiring and connectors for corrosion, water ingress, chafing, heat damage or pushed-out pins
With the ignition on and the pump commanded if possible, measure the voltage at the pump connector and compare with the wiring diagram
Check the supply and earth wires for continuity and voltage drop under load
Check the pump current draw and operation using a live data or actuator test, if the vehicle supports it
Check for a software update or technical bulletin for the control unit once the wiring and pump have been proven good

How to fix

Replace the blown fuse or faulty relay after finding and correcting the cause of the failure
Repair or replace damaged wiring in the pump supply circuit
Clean, repair or replace corroded or damaged connectors and terminals
Replace the reductant pump or pump module if it is faulty or drawing abnormal current
Restore correct battery and charging system condition if the supply voltage is low
Replace or reprogram the control unit, or apply a manufacturer software update, only if testing confirms it is at fault

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but the reductant system will not work properly, emissions will be higher and some vehicles reduce power or limit restarts after a set distance. Have it repaired soon to avoid a restricted start.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.