Safe to driveUntil the next service
J1939 code SPN 904. Below — how the fault is worded at the factory by Mercedes-Benz and SITRAK, and what the second half of the code (FMI) means in the standard.
| FMI 19 | J1939 Front Axle Speed Signal is erratic = undefined value but not SNA |
| FMI 12 | Timeout of the EBC2 CAN frame. Effect: Loss of communication with the modules, some functions are disabled. |
| FMI 19 | Incorrect data length of the EBC2 CAN frame. Effect: Loss of communication with the modules, some functions are disabled. |
| SPN 904 FMI 12904/12 · 904.12 | faulty device or component |
| SPN 904 FMI 19904/19 · 904.19 | error in received network data |
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.