1944459 BPV / exhaust back pressure valve 1944459: symptoms, fault codes and OEM cross references.
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.
OEM report needs verification
This number appears in duplicated or conflicting report groups. Confirm by VIN, engine type, installed connector and photos before quoting or fitting.
- Conflicts with HE500VG turbo group: 1944459, 1959915, 3781185, 3791936, 3791939, 3792555, 3792559, 4031045, 5330077, 5355092.
What drivers and mechanics usually notice.
These are practical, workshop-style symptom phrases written for search and support conversations. They are not a substitute for live diagnostic data.
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
Why 1944459 usually fails
- 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.
Before replacing the part
- Run the BPV pre-operational sweep and compare commanded vs actual valve position.
- If the code returns after actuator replacement, inspect the butterfly shaft for binding.
- Because 1944459 is also reported as a Holset HE500VG turbo number, verify the physical part before quoting.
P-codes reported with 1944459.
| Code | Lookup hint | Related symptom area |
|---|---|---|
| P101E | BPV actuator cannot reach commanded position in report data | Distinct lack of power under load |
| P1020 | BPV internal actuator error in report data | Distinct lack of power under load |
| P1024 | BPV control or end-stop issue in report data | Distinct lack of power under load |
| P1025 | BPV control or end-stop issue in report data | Distinct lack of power under load |
| P1052 | Reported with this component family; confirm with DAF diagnostics and live data. | Distinct lack of power under load |
| P1496 | Engine protection / EGR or BPV control report code | Distinct lack of power under load |
| P3914 | BPV communication / actuation report code | Distinct lack of power under load |
| U1579 | BPV communication / E-CAN report code | Distinct lack of power under load |
All numbers grouped under the canonical 1944459 page.
Keeping every duplicate and replacement number visible on the same canonical page helps exact OEM searches without creating hundreds of duplicated pages.
Truck, engine and year ranges from the reports.
| Truck model | Engine | Years | HP |
|---|---|---|---|
| XF 106 | MX-11 Euro 6 | 2013-2023 | 320-440 |
| XF 106 | MX-13 Euro 6 | 2013-2023 | 410-530 |
| CF 480 | MX-13 Euro 6 | 2013-2023 | 480 |
Fitment is structured from user-provided reports and must be verified by VIN, installed connector and physical part markings before supply.
Questions about 1944459.
What are common failure symptoms for 1944459?
Common symptoms include Distinct lack of power under load; Severe hesitation during acceleration; Engine protection or torque limitation active; Poor warm-up from cold. Exact symptoms vary by truck, software level and related faults.
Which fault codes are linked with 1944459?
Reported fault codes include P101E, P1020, P1024, P1025, P1052, P1496, P3914, U1579.
Can I order by OEM number 1944459 only?
Use the OEM number as a starting point, then confirm by VIN, engine type, installed connector and part photos because some reports contain duplicate or conflicting OEM references.
More back pressure valve lookups
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