Safe to driveTo the nearest safe stop
J1939 code SPN 628. Below — how the fault is worded at the factory by Isuzu, Mercedes-Benz, Renault Trucks and SITRAK, and what the second half of the code (FMI) means in the standard.
IsuzuMercedes-BenzRenault TrucksSITRAK
| FMI 2 | ROM fault (P0601) |
| FMI 12 | EEPROM Checksum Failure for the SCR Block |
| FMI 14 | XFLASH Static Fault Code Memory Page Read Write Failure |
| FMI 2 | EBS unit not parameterised. Repair: Perform the programming. If the fault persists, replace the EBS unit. |
| FMI 13 | Internal control unit fault (EBS), or the engine unit factory parameterisation has not been done. Repair: Program the EECU. Perform the programming. If the fault persists, replace the EBS unit. |
| FMI 13 | Flash memory check failure |
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.