Do not driveTo the nearest safe stop
SPN 4237 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by SITRAK, and what the second half of the code (FMI) means.
| FMI 0 | Adaptive value too high |
| FMI 1 | Adaptive value too low |
| FMI 19 | NOx sensor dynamic check before the catalyst: rising edge. Scan tool code: P06EA. Effect: Torque limited, MIL on, power may drop to 60%. |
| FMI 31 | Fault detected by the FBR control monitoring. Scan tool code: P015F. Effect: Torque may be limited. |
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.