Do not driveTo the nearest safe stop
J1939 code SPN 1809. Below — how the fault is worded at the factory by Bendix ABS/ESP and Meritor (ex-WABCO), and what the second half of the code (FMI) means in the standard.
| FMI 2 | LAS Signal Out of Range; LAS Static Calibration Error; LAS Long Term Calibration Error; LAS Plausibility Error (Inside ECU-Specific Limits); LAS Plausibility Error (Outside ECU-Specific Limits) |
| FMI 13 | LAS Calibration in Progress |
| FMI 1 | Minimum Dynamic Failure/Lateral Acceleration |
| FMI 7 | Faulty Sign between Lateral Acceleration and Steerangle |
| FMI 12 | ESC Module Failure Flag 'Lateral Acceleration Sensor' |
| FMI 14 | Yaw Rate Cross Check (Lateral Acceleration) |
| FMI 15 | Signal Offset Failure of Lateral Acceleration Sensing |
| FMI 17 | Neutral Value Detection (Lateral Acceleration) |
| FMI 20 | Signal Drift Failure of Lateral Acceleration Sensing |
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.