P0256
PPowertrainInjection Pump Fuel Metering Control B Fault
What does this code mean?
Severity : HighP0256 signals a fault in fuel metering control B of the diesel injection pump. This circuit controls how much fuel is delivered, through a metering valve, rotor or injectors depending on the design. Implementation varies by manufacturer. The engine control module has detected abnormal operation of this control.
Symptoms
- Check engine light on.
- Loss of power or limp mode.
- Hard starting or stalling.
- Smoke from the exhaust.
- Rough running.
Possible causes
- Faulty pump metering valve or actuator.
- Damaged wiring or connector.
- Worn injection pump.
- Contaminated fuel or clogged filter.
- Engine control module fault, which is rare.
Diagnosis and repair
- Inspect the metering control connector and wiring.
- Measure actuator resistance and its control signal.
- Compare desired and actual fuel quantity and pressure in live data.
- Check the fuel filter and fuel quality.
- Repair or replace the faulty part, clear the code and road test.
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Code
P0256
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012