Safe to driveTo the nearest safe stop
J1939 code SPN 1845. 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 TCFG2 Message is missing or not available |
| FMI 2 | Transmission torque limit message failed the SAE J1939 check. Effect: Loss of communication with the modules, some functions are disabled. |
| FMI 12 | Timeout of the TCFG2 CAN frame. Effect: Loss of communication with the modules, some functions are disabled. |
| FMI 19 | Linear lambda value from the NOx sensor before the catalyst above the upper limit. Scan tool code: P2203. Effect: Torque limited, MIL on, power may drop to 60%. |
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.