SPN 190 FMI 9 — Engine speed signal abnormal update rate
What it means: Engine speed signal abnormal update rate.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Check J1939 to engine ECM
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Ocala, FL
Closest first. Tell them SPN 190 FMI 9 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Ocala, FL · (352) 830-1899
- 0.0 mi away — based in Ocala, FL · (352) 620-0740
- 0.0 mi away — based in Ocala, FL · (352) 497-0277
Applies to: Allison
What SPN 190 FMI 9 means
Engine speed signal abnormal update rate.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- J1939 bus issue
- Engine ECM not broadcasting
First moves (roadside)
- Check J1939 to engine ECM
FAQ
Engine speed signal abnormal update rate.
Serious — Power derate likely — plan to stop soon.
The most common cause is: J1939 bus issue. Other possibilities include Engine ECM not broadcasting.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside SPN 190 FMI 9, or share the same subsystem.
- Engine speed sensor — erratic (SPN 190 FMI 2)
- Engine overspeed (SPN 190 FMI 16)
- Main shaft speed erratic (SPN 160 FMI 2)
- Input shaft speed erratic (SPN 161 FMI 2)
- Transmission output retarder speed erratic (SPN 162 FMI 2)
- Trans oil temperature very high (SPN 177 FMI 0)
- Trans oil temperature voltage high (SPN 177 FMI 3)
- Trans oil temperature voltage low (SPN 177 FMI 4)
Find a mechanic or related guides
General diagnostic guidance for heavy-duty diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack). Not a substitute for a scan-tool diagnosis on your specific truck.