Safe to driveEnough to reach the yard
J1939 code SPN 987. Below — how the fault is worded at the factory by International and Isuzu, and what the second half of the code (FMI) means in the standard.
| FMI 5 | Protect Lamp — Protect warning light malfunction |
| FMI 3 | Check engine lamp fault (P0650) |
| SPN 987 FMI 3987/3 · 987.3 | voltage above normal or shorted high |
| SPN 987 FMI 5987/5 · 987.5 | current below normal or open circuit |
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.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.