Code Details
| Display code | SPN 3055 FMI 14 |
|---|---|
| SPN | 3055 |
| FMI | 14 |
| OEM code | None listed |
| Manufacturer | PACCAR |
| System | Aftertreatment �?DPF |
| Component | DPF / regen system / aftertreatment control |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | source backed |
| Source confidence | medium |
| Last reviewed | 2026-06-12 |
Plain-English Meaning
When the PACCAR MX-13 DPF soot load rises beyond what driving regens can manage, the system requests a parked regen. SPN 3055 FMI 14 is the formal notification. Kenworth T680, T880, and Peterbilt 579 trucks with the MX-13 operating in high-traffic, stop-and-go, or short-haul conditions are most likely to trigger this fault due to limited opportunities for highway-temperature driving regens. On Kenworth and Peterbilt trucks with the MX-13, the DPF regen inhibit strategy prevents regen from initiating under unsafe conditions — such as vehicle speed below a threshold, exhaust brake active, or PTO engaged. DAVIE4 displays the inhibit reason in the active faults list. For fleet vehicles that operate primarily in urban delivery cycles where speed and duty-cycle conditions rarely allow parked regen to complete, a weekly or bi-weekly scheduled parked regen during off-duty time should be part of the maintenance plan to prevent soot accumulation to restriction levels.
SPN 3055 FMI 14 is DPF Condition �?parked regen required. DAVIE4 and PACCAR ESA display DPF soot load and regen history for the MX-13 aftertreatment system. Both can initiate a forced stationary regen. The DPF soot load is measured by differential pressure across the filter �?DAVIE4 provides the sensor readings that confirm the soot load calculation.
Common Symptoms
- DPF regen warning on the Kenworth or Peterbilt instrument cluster
- Possible speed or power limitation
- More frequent on city or construction vocational applications
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Stop-and-go operation preventing driving regen
- Driver inhibiting regen requests
- Short-trip operation without highway temperature cycles
First Checks
- Initiate parked regen per the KW/Pete driver display procedure outdoors
- Monitor DPF soot load in DAVIE4 during the regen
- After completion, confirm soot load returned to normal
- Connect DAVIE4 and check the inhibit reason displayed with SPN 3055 FMI 14
- If the vehicle operates in urban stop-and-go service, schedule a weekly parked regen during off-hours
Can I Keep Driving?
Driveable but derate will escalate. Complete the parked regen as soon as safely possible.
Related Codes
Related Lookup Pages
Sources
- PACCAR / Kenworth / Peterbilt Service Support — MX Engine Resources PACCAR Inc. · oem · accessed 2026-06-11 · confidence medium
Source: PACCAR Inc., PACCAR / Kenworth / Peterbilt Service Support — MX Engine Resources. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - PACCAR Engine Technical Services PACCAR Inc. · oem · accessed 2026-06-10 · confidence medium
Source: PACCAR Inc., PACCAR Engine Technical Services. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - SAE J1939 Standards Collection SAE International · official · accessed 2026-05-05 · confidence medium
Source: SAE International, SAE J1939 Standards Collection. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
Does the Kenworth T680 parked regen require DAVIE4 or can the driver do it from the cab?
The Kenworth T680 driver display provides a parked regen initiation sequence that the driver can operate from the cab without a diagnostic tool. DAVIE4 is needed if the driver-initiated regen fails to start (e.g., an inhibit condition is blocking it) or if a service-level forced regen is needed. DAVIE4 can bypass inhibit conditions and monitor the regen from start to finish.
How does PACCAR ESA compare to DAVIE4 for the MX-13 parked regen?
DAVIE4 is the primary European PACCAR diagnostic tool (used with DAF trucks), while PACCAR ESA is the North American equivalent for Kenworth and Peterbilt. Both can initiate and monitor a forced regen, but PACCAR ESA is the appropriate tool for MX-13 engines in North American trucks. DAVIE4 is also sometimes used in North American shops with the appropriate software license.
Can a Kenworth T680 with MX-13 complete a parked regen on a cold day?
Yes. Cold weather does not prevent a parked regen from completing �?the engine runs at elevated idle and the regen system actively heats the DPF using the dosing injector. However, cold weather may extend the warm-up time before the regen cycle begins. The truck must be outdoors in a safe area throughout the cycle, regardless of ambient temperature.