What does DAF fault code P0400 point to?

P0400 is reported in this data as: EGR flow malfunction. It can be linked with 1711516 depending on truck model, engine and live diagnostic data.

Can I order a part from fault code P0400 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 P0400: likely components, OEM numbers and symptoms.

EGR flow malfunction. This page groups every component report connected with P0400, 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 P0400.

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

EGR valve

1711516 · Earlier DAF EGR valve 1711516

DAF / PACCAR

Earlier EGR valve interchange group from the reports. Fitment was not fully specified, so use this as a lookup and diagnostic content page, not as a final fitment guarantee.

Top symptoms

Rough idle or stalling at low speed
Power loss and black smoke
Engine warning lamp for EGR flow

OEM numbers

1711516 1681971 1812519 1406454 1812518 1409255

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Defect symptoms

Symptoms reported with P0400

Rough idle or stalling at low speed

Power loss and black smoke

Engine warning lamp for EGR flow

Increased fuel consumption

Failed emissions test or high NOx reading

OEM numbers

OEM references to check

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

1711516 1681971 1812519 1406454 1812518 1409255

Why it happens

Likely root causes behind P0400

Excessive soot build-up blocks EGR flow.
Actuator motor burns out after high resistance at the valve shaft.
Valve sticks open or closed after long-mileage exhaust contamination.

Fitment

Trucks and engines that report P0400

Model	Engine	Years
DAF XF / CF	Earlier EGR-equipped engines	2001-2013

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