What does DAF fault code P3408 point to?

P3408 is reported in this data as: Cylinder 1 engine-brake solenoid electrical report. It can be linked with B411 depending on truck model, engine and live diagnostic data.

Can I order a part from fault code P3408 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 P3408: likely components, OEM numbers and symptoms.

Cylinder 1 engine-brake solenoid electrical report. This page groups every component report connected with P3408, 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 P3408.

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

B411 · B411 engine brake solenoid cyl 1

DAF

Cylinder 1 MX engine brake solenoid group. Searches usually combine B411 with P3405, P3407 or complaints about weak engine braking.

Top symptoms

MX engine brake retard force reduced
Engine brake loses one stage and feels weak
DAVIE4 actuation test on brake cylinder 1 fails

OEM numbers

B411 1907284 1907285

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Defect symptoms

Symptoms reported with P3408

MX engine brake retard force reduced

Engine brake loses one stage and feels weak

DAVIE4 actuation test on brake cylinder 1 fails

Uneven engine brake noise on overrun

Engine warning lamp appears when engine brake is applied

OEM numbers

OEM references to check

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

B411 1907284 1907285

Why it happens

Likely root causes behind P3408

Open circuit on ECU output or short to ground.
Engine brake cylinder 1 solenoid coil burn-out.
Valve clearance or mechanical pusher issue on the rocker shaft.
Varnish or oil contamination creates sticky valve movement.

Fitment

Trucks and engines that report P3408

Model	Engine	Years
XF 105	PACCAR MX Euro 3/4/5	2005-2013
XF 106	MX-11 / MX-13 Euro 6	2013-2023
CF 85	PACCAR MX Euro 3/4/5/6	2005-2022
CF 430 / CF 480 / CF 530	MX Euro 6	2017-2023

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