What does DAF fault code P0271 point to?

P0271 is reported in this data as: Cylinder 4 pump/injector control circuit high. It can be linked with B134 depending on truck model, engine and live diagnostic data.

Can I order a part from fault code P0271 only?

Use the fault code to narrow the diagnosis, then verify the installed OEM number, VIN, connector, actuator type and part photos before ordering or quoting.

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Fault-code lookup

DAF fault code P0271: likely components, OEM numbers and symptoms.

Cylinder 4 pump/injector control circuit high. This page groups every component report connected with P0271, so a mechanic can move from the error code to the relevant OEM numbers, defect symptoms and fitment checks.

A fault code alone is not a parts order. Confirm with live data, VIN, installed OEM number, connector and part photos before quoting or fitting.

Likely components

Component families linked with P0271.

The same code can appear with different root causes. Use the OEM number and symptom pattern to choose the right branch.

Fuel / brake / bypass valve

B134 · B134 pump unit valve cyl 4

DAF / PACCAR

Cylinder 4 unit pump solenoid group for DAF DMCI/EUP systems. Focuses on cylinder 4 misfire, P0204/P0270/P0271 fault code searches and high-mileage solenoid failures.

Top symptoms

Cylinder 4 diesel knock under acceleration
Jerky pull from 900 to 1200 rpm
Cylinder 4 contribution too low

OEM numbers

B134 1668325 1827043 BEBU4B00000 BEBU5A00000 0414755006

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Defect symptoms

Symptoms reported with P0271

Cylinder 4 diesel knock under acceleration

Jerky pull from 900 to 1200 rpm

Cylinder 4 contribution too low

Engine derate or power reduction

Hard starting after heat soak

OEM numbers

OEM references to check

Use these links when the workshop note only contains an OE number instead of the exact part family.

B134 1668325 1827043 BEBU4B00000 BEBU5A00000 0414755006

Why it happens

Likely root causes behind P0271

Open or short circuit on cylinder 4 ECU/pump wiring.
Coil winding insulation breakdown.
Pump unit cylinder 4 internal seizure or sticking control valve.
Metal debris from lift-pump wear damaging unit pump elements.

Fitment

Trucks and engines that report P0271

Model	Engine	Years
XF 95	PACCAR XE/MX Euro 3	2001-2006
XF 105	PACCAR MX Euro 3/4/5	2005-2013
CF 75	PACCAR PR Euro 3/4/5	2001-2013
CF 85	PACCAR MX Euro 3/4/5	2001-2013

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