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SPN 1811 FMI 9 — Cab controller J1939 message lost
SeriousAbsPower derate likely — plan to stop soon
Applies to: Bendix · Wabco
Cab controller J1939 message lost.
Don't risk it — get a diesel tech on the truck.
Your SPN/FMI rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- J1939 issue
- BCM issue
- J1939
- BCM
First moves (roadside)
- Check bus
FAQ
What does SPN 1811 FMI 9 mean?
Cab controller J1939 message lost.
How serious is SPN 1811 FMI 9?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of SPN 1811 FMI 9?
The most common cause is: J1939 issue. Other possibilities include BCM issue; J1939; BCM.
Can I keep driving with SPN 1811 FMI 9?
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
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.