Safe to driveUntil the next service
SPN 523604 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, MAZ and YaMZ, and what the second half of the code (FMI) means.
| FMI 12 | CAN: RxEngTemp2 timeout |
| FMI 12 | CAN message RxEngTemp2 error - CAN bus message timeout. Blink code: 4-5-1. Repair: Check the CAN line connection to the other CAN devices. |
| FMI 12 | RxEngTemp2 CAN message fault (CAN bus message timeout). Blink code: 4-5-1. Repair: Check the CAN line connection to the other CAN devices. |
| SPN 523604 FMI 12523604/12 · 523604.12 | faulty device or component |
Safe to drive. Below — how much time you have and what happens if you keep going.
A standalone fault with no immediate consequences for driving.
Show the codes at the next service. If a second code from the same system appears, stop putting it off.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.