Code Details
| Display code | SPN 190 FMI 0 |
|---|---|
| SPN | 190 |
| FMI | 0 |
| OEM code | None listed |
| Manufacturer | Mack |
| System | Engine �?speed / overspeed protection |
| Component | Engine control module / overspeed protection |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | source backed |
| Source confidence | medium |
| Last reviewed | 2026-06-12 |
Plain-English Meaning
The Mack MP8 ECM monitors engine speed continuously and cuts fuel delivery when speed exceeds the maximum allowed RPM. SPN 190 FMI 0 records that this protection event occurred. On Mack Anthem, Pinnacle, and Granite trucks, overspeed events are most commonly associated with a missed mDrive downshift, a driver-forced manual gear selection on a downgrade, or a load drop event. VCADS Pro (PTT) stores the event data for fleet review. VCADS Pro (PTT) stores fault event records with peak RPM, vehicle speed, and gear position for SPN 190 FMI 0 events on the Mack MP8. This data is the key to classifying the event type. If the peak RPM was only slightly above the protection limit during a confirmed grade descent, no mechanical action is needed. If peak RPM was severely elevated, or if the event recurs frequently, review the driver behavior and route with fleet management.
SPN 190 FMI 0 is Engine Speed above normal range. VCADS Pro (PTT) stores fault event records with peak RPM, gear position (mDrive if equipped), and vehicle speed. The mDrive transmission is the Mack-branded Volvo I-Shift, so mDrive-related shift failures can contribute to overspeed events on Mack Anthem and Pinnacle trucks.
Common Symptoms
- Stored fault, typically no active drivability complaint after the event
- Driver may have felt a sudden fuel cutoff during the event
- Possible mDrive transmission companion codes
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Missed downshift in manual mode on a grade
- mDrive failed shift causing RPM spike
- Downhill grade with inadequate retarder engagement
- Load drop during PTO operation
First Checks
- Connect VCADS Pro (PTT) and review the overspeed fault event snapshot
- Check for companion mDrive transmission fault codes
- Discuss conditions with the driver to understand what occurred
- Review VCADS Pro fault event snapshot — note peak RPM, vehicle speed at the time, and gear position
- Evaluate the route for grades where repeated overspeed events are occurring
Can I Keep Driving?
Typically no immediate impact after a single minor event. Severe or repeated events warrant engine inspection.
Related Codes
Related Lookup Pages
Sources
- Mack Trucks Service Support Public Resources Mack Trucks Inc. · oem · accessed 2026-06-11 · confidence medium
Source: Mack Trucks Inc., Mack Trucks Service Support Public Resources. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - Volvo Trucks / Mack Trucks Technical Support Volvo Trucks North America / Mack Trucks Inc. · oem · accessed 2026-06-10 · confidence medium
Source: Volvo Trucks North America / Mack Trucks Inc., Volvo Trucks / Mack Trucks Technical Support. 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
Is the Mack mDrive the same transmission as the Volvo I-Shift?
Yes. The Mack mDrive is the Mack-branded version of the Volvo I-Shift automated manual transmission. Both share the same mechanical hardware and control architecture. Service procedures, fault codes, and diagnostic tools are equivalent �?VCADS Pro and PTT both support the shared platform.
Does SPN 190 FMI 0 affect a Mack Granite vocational truck differently than a Mack Anthem highway truck?
The engine protection response is the same regardless of truck model �?the ECM cuts fuel when overspeed is detected. The typical causes differ: highway trucks are more susceptible to missed gear events on grades; vocational trucks may see overspeed events related to PTO load drops or downhill operating conditions specific to the job site. VCADS Pro event data helps identify the pattern.
Can PTT show historical overspeed event counts on the Mack MP8?
Yes. PTT (VCADS Pro) displays fault occurrence counts and timestamps for fault events. For SPN 190 FMI 0, the total occurrence count and the most recent event data are accessible. Fleet managers use this data to identify trucks with repeated overspeed patterns that may indicate a driver behavior or route issue.