Safe to driveTo the nearest safe stop
J1939 code SPN 2900. 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 9 | J1939 ETC7 Message is missing or not available |
| FMI 2 | Engine cranking enable from the transmission is not set. Effect: Torque may be limited. |
| SPN 2900 FMI 22900/2 · 2900.2 | data erratic or intermittent |
| SPN 2900 FMI 92900/9 · 2900.9 | abnormal update rate |
Safe to drive. Below — how much time you have and what happens if you keep going.
The gearbox or clutch has gone into limp mode: some gears may be unavailable and an automated box may stop shifting under load.
The main risk is being left on a climb with no gear and rolling back. Do not take a loaded truck into the hills; reaching level ground and a shop is fine.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.