What does DAF fault code U1579 point to?

U1579 is reported in this data as: BPV communication / E-CAN report code. It can be linked with 1944459 depending on truck model, engine and live diagnostic data.

Can I order a part from fault code U1579 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 U1579: likely components, OEM numbers and symptoms.

BPV communication / E-CAN report code. This page groups every component report connected with U1579, 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 U1579.

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

Back pressure valve

1944459 · BPV / exhaust back pressure valve 1944459

DAF / PACCAR

Back pressure valve report group for MX-11/MX-13 Euro 6 applications. The same OEM number appears in turbo reports too, so this page deliberately exposes the ambiguity and asks users to verify by VIN or photo.

Top symptoms

Distinct lack of power under load
Severe hesitation during acceleration
Engine protection or torque limitation active

OEM numbers

1944459 1959915 3781185 3791936 3791939 3792555 3792559 4031045

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Defect symptoms

Symptoms reported with U1579

Distinct lack of power under load

Severe hesitation during acceleration

Engine protection or torque limitation active

Poor warm-up from cold

Loss of secondary engine braking

Exhaust chuffing or harsh barking when engine brake is used

OEM numbers

OEM references to check

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

1944459 1959915 3781185 3791936 3791939 3792555 3792559 4031045 5330077 5355092 2210375 1856755 1856756 2123991 2426244 2256371 2187598

Why it happens

Likely root causes behind U1579

Continuous high-frequency modulation wears the non-replaceable butterfly shaft bearing.
Thermal cycling and soot deposits make the butterfly valve bind in the exhaust stream.
Smart actuator or electromotor develops internal errors when the flap cannot reach its end stops.
E-CAN communication and position tracking faults appear after mechanical jamming.

Fitment

Trucks and engines that report U1579

Model	Engine	Years
XF 106	MX-11 Euro 6	2013-2023
XF 106	MX-13 Euro 6	2013-2023
CF 480	MX-13 Euro 6	2013-2023

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