Code Details
| Display code | SPN 190 FMI 0 |
|---|---|
| SPN | 190 |
| FMI | 0 |
| OEM code | None listed |
| Manufacturer | PACCAR |
| System | Engine �?speed / overspeed protection |
| Component | Engine control module / overspeed protection system |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | source backed |
| Source confidence | medium |
| Last reviewed | 2026-06-12 |
Plain-English Meaning
The PACCAR MX-13 ECM monitors engine speed continuously and cuts fuel delivery when the speed exceeds the maximum allowed RPM. SPN 190 FMI 0 records that an overspeed event occurred. On Kenworth T680, T880, and Peterbilt 579 trucks, this most commonly occurs from a missed downshift or a failed UltraShift AMT gear change. The MX-13's event data snapshot in DAVIE4 or PACCAR ESA captures the conditions at the moment of the overspeed for review. On Kenworth T680, T880, and Peterbilt 579 trucks with the MX-13, the overspeed fault event snapshot in DAVIE4 shows peak RPM, vehicle speed, and gear position. The MX-13 overspeed threshold is set above the rated speed to protect the engine during grade descents where the road speed exceeds the engine governor threshold. On trucks with PACCAR automated PX-7 or MX-13 transmissions, a failed downshift on a grade is the most common cause. DAVIE4 can run a shift quality test to confirm whether a transmission shift failure contributed to the overspeed event.
SPN 190 FMI 0 is Engine Speed above normal range. DAVIE4 and PACCAR ESA store fault event records for overspeed occurrences, including peak engine speed, vehicle speed, and transmission gear. This event data is critical for determining whether the overspeed was driver-induced, transmission-related, or associated with another fault.
Common Symptoms
- Stored historical fault �?engine may operate normally after the event
- Driver may have felt a sudden fuel cutoff and RPM drop during the event
- Possible companion transmission codes if AMT shift failure contributed
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Missed downshift in manual mode
- AMT (UltraShift or similar) shift failure causing RPM spike
- Downhill grade with retarder not engaged adequately
- Load drop under PTO operation
- Accelerator position sensor fault
First Checks
- Connect DAVIE4 or PACCAR ESA and review the fault event snapshot for peak RPM and operating conditions
- Check for companion AMT transmission fault codes
- Discuss with driver to determine if the event was unexpected or during a manual gear selection
- For repeated overspeed events, investigate transmission calibration or driver training needs
- Review the fault event snapshot in DAVIE4 — note peak RPM, vehicle speed, and gear position during the fault
- If a transmission shift failure contributed to the event, run the shift quality test in DAVIE4
Can I Keep Driving?
No immediate drivability impact expected after a single minor overspeed event. Severe or repeated events warrant engine inspection.
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 SPN 190 FMI 0 on the PACCAR MX-13 require a service action?
For a single minor overspeed, no immediate service action is typically required if the peak RPM was close to the limit and no companion codes indicate mechanical damage. DAVIE4 or PACCAR ESA event data helps assess severity. Repeated events or extreme RPM peaks warrant engine inspection and investigation of the transmission or driver behavior contributing to the overspeed.
Can DAVIE4 clear the SPN 190 overspeed fault from the MX-13?
DAVIE4 can clear stored fault codes including SPN 190 FMI 0 after diagnosing the root cause. However, the fault event record (including the peak RPM snapshot) is a separate historical log entry that DAVIE4 can read and export for fleet records. Clearing the fault code does not delete the event log history.
Does the PACCAR MX-13 have a different overspeed limit for Kenworth versus Peterbilt applications?
The overspeed limit is determined by the engine calibration, not the truck brand. Both Kenworth and Peterbilt trucks use the same MX-13 engine with the same calibration parameters. However, truck model year, vocation (on-highway vs. vocational), and specific PACCAR specification packages can result in different engine calibration parameters. DAVIE4 or PACCAR ESA with the engine serial number confirms the exact overspeed threshold for the specific unit.