Safe to driveEnough to reach the yard
J1939 code SPN 1569. No factory wording for it in the reference — below is the standard meaning of FMI.
Safe to drive. Below — how much time you have and what happens if you keep going.
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.
This code is often not the fault itself but a knock-on. If any of these is in the same readout, start with it:
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.