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DAF fault code P1231: likely components, OEM numbers and symptoms.

Cylinder 2 pump-unit contribution / control report. This page groups every component report connected with P1231, 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 P1231.

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

Defect symptoms

Symptoms reported with P1231

Cylinder 2 misfire and vibration at idle
Torque contribution from cylinder 2 too low
Engine cuts out at higher RPM
White smoke puff at idle after running hot
Slow throttle response and reduced torque
OEM numbers

OEM references to check

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

B132 1668325 1827043 BEBU4B00000 BEBU5A00000 0414755006 0414755007
Why it happens

Likely root causes behind P1231

  • Open circuit at ECU pins or pump connector.
  • Short to ground in the harness.
  • Pump-unit internal leak or weak hot solenoid.
  • Cylinder 2 nozzle clogging from fuel contamination.
Fitment

Trucks and engines that report P1231

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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