Do not driveTo the nearest safe stop
SPN 57 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Renault Trucks, and what the second half of the code (FMI) means.
| FMI 0 | Conditions for switching to reduced performance mode are faulty (message from the lever or from braking). Repair: Check the joystick unit. Check the braking electronic control unit. If the fault persists, replace the control unit. |
| SPN 57 FMI 057/0 · 57.0 | data above normal range (most severe level) |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.
This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.