Safe to driveTo the nearest safe stop
J1939 code SPN 676. Below — how the fault is worded at the factory by KAMAZ, MAZ, Renault Trucks and YaMZ, and what the second half of the code (FMI) means in the standard.
| FMI 7 | Intake air pre-heater permanently on |
| FMI 7 | Intake air pre-heater stuck on - Signal invalid. Blink code: 3-2-2. Repair: Check the air preheater and its wiring. |
| FMI 3 | Glow plug relay (DCI6 only), short to battery voltage. Repair: Check the glow plug relay and the chassis wiring. |
| FMI 5 | Glow plug relay (DCI6 only), short to ground. Repair: Check the glow plug relay and the chassis wiring. |
| FMI 7 | Intake air preheater continuously on (Signal incorrect). Blink code: 3-2-2. Repair: Check the air preheater and its wiring. |
| SPN 676 FMI 3676/3 · 676.3 | voltage above normal or shorted high |
| SPN 676 FMI 5676/5 · 676.5 | current below normal or open circuit |
| SPN 676 FMI 7676/7 · 676.7 | mechanical system not responding |
Safe to drive. Below — how much time you have and what happens if you keep going.
The electrical system is not holding voltage. While the engine runs the alternator carries it; shut it off and you may not restart.
Next the lights go, then modules start dropping out and false codes appear all over the truck. Get to somewhere with help without shutting the engine down.
Check the battery terminals and earth strap — corrosion and loose clamps throw false codes all over the truck. Running voltage should be 27–29 V.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.