B414 B414 engine brake solenoid cyl 4: symptoms, fault codes and OEM cross references.
Cylinder 4 MX engine brake solenoid group for B414 and P3425/P3427/P3428/P3429/P3431/P3432 searches.
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.
MX engine brake noticeably weaker than normal
Engine brake force drops as RPM falls
DAVIE4 brake actuator self-test fails on cylinder 4
Audible irregular cadence of engine brake on overrun
Fault appears after hot soak or long descent
Why B414 usually fails
- Solenoid coil winding failure.
- Open or short circuit on cylinder 4 engine-brake wiring.
- Valve plunger sticks from oil sludge or varnish.
- ECU output or rocker-cover harness fault.
Before replacing the part
- Test solenoid resistance cold and hot if the complaint is intermittent.
- Look for sludge or varnish in the plunger before blaming the ECU.
P-codes reported with B414.
| Code | Lookup hint | Related symptom area |
|---|---|---|
| P3425 | Cylinder 4 engine-brake solenoid control circuit/open report | MX engine brake noticeably weaker than normal |
| P3426 | Cylinder 4 engine-brake solenoid performance report | MX engine brake noticeably weaker than normal |
| P3427 | Cylinder 4 engine-brake solenoid short-to-ground report | MX engine brake noticeably weaker than normal |
| P3428 | Cylinder 4 engine-brake solenoid electrical report | MX engine brake noticeably weaker than normal |
| P3429 | Cylinder 4 engine-brake solenoid control circuit/open report | MX engine brake noticeably weaker than normal |
| P3431 | Cylinder 4 engine-brake solenoid short-to-ground report | MX engine brake noticeably weaker than normal |
| P3432 | Cylinder 4 engine-brake solenoid electrical report | MX engine brake noticeably weaker than normal |
All numbers grouped under the canonical B414 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 105 | PACCAR MX Euro 3/4/5 | 2005-2013 | 360-510 |
| XF 106 | MX-11 / MX-13 Euro 6 | 2013-2023 | 320-530 |
| CF 85 | PACCAR MX Euro 4/5/6 | 2005-2022 | 340-530 |
| CF 430 / CF 480 / CF 530 | MX Euro 6 | 2017-2023 | 430-530 |
Fitment is structured from user-provided reports and must be verified by VIN, installed connector and physical part markings before supply.
Questions about B414.
What are common failure symptoms for B414?
Common symptoms include MX engine brake noticeably weaker than normal; Engine brake force drops as RPM falls; DAVIE4 brake actuator self-test fails on cylinder 4; Audible irregular cadence of engine brake on overrun. Exact symptoms vary by truck, software level and related faults.
Which fault codes are linked with B414?
Reported fault codes include P3425, P3426, P3427, P3428, P3429, P3431, P3432.
Can I order by OEM number B414 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.
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