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SPN 1110 — Engine protection system shut down engine

Safe to driveEnough to reach the yard

J1939 code SPN 1110. No factory wording for it in the reference — below is the standard meaning of FMI.

Common FMI values

SPN 1110 FMI 01110/0 · 1110.0data above normal range (most severe level)
SPN 1110 FMI 11110/1 · 1110.1data below normal range (most severe level)
SPN 1110 FMI 21110/2 · 1110.2data erratic or intermittent
SPN 1110 FMI 31110/3 · 1110.3voltage above normal or shorted high
SPN 1110 FMI 41110/4 · 1110.4voltage below normal or shorted to ground
SPN 1110 FMI 51110/5 · 1110.5current below normal or open circuit

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Enough to reach the yard

This is not the fault, it is the reaction to it: the ECU is cutting power to protect the engine or the aftertreatment.

The limit will keep tightening until the cause is fixed. The code to chase is the one that triggered this, not this one.

That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.

Where to start

This code is often not the fault itself but a knock-on. If any of these is in the same readout, start with it:

Nearby: engine protection

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.