Do not driveTo the nearest safe stop
J1939 code SPN 1808. 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 | Sensor CAN Supply Voltage Error; ESP Sensor Voltage Out of Range; YRS Signal Out of Range; YRS Sensor Reversed Signal; YRS Invalid Signal; YRS Gradient Error; YRS Static BITE Error; YRS Dynamic BITE Error; YRS Fast Calibration Error; YRS Static Calibration Error; YRS Normal Calibration Error; YRS Sensitivity Calibration Error; YRS Plausibility Check (Ref Yaw Rate); YRS Plausibility Error (Inside ECU-Specific Limits); YRS Plausibility Error (Outside ECU-Specific Limits); Yaw Rate Sensor Vibration Detected |
| FMI 9 | YRS CAN Timeout |
| FMI 13 | YRS Sign Check Not Finished |
| FMI 14 | Erratic ESP Sensor Signal |
| FMI 1 | Minimum Dynamic Failure/Yaw Rate |
| FMI 2 | Range Check Failure of Yaw Rate Sensor Signal |
| FMI 3 | Drift Failure of Yaw Rate Sensor Signal (Standstill) |
| FMI 5 | Offset Failure of Yaw Rate Sensor Signal |
| FMI 12 | ESC Module Failure Flag 'Yaw Rate Sensor' |
| FMI 14 | Yaw Rate Cross Check (Yaw Rate Signal) |
| FMI 17 | Neutral Value Detection (Yaw Rate) |
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.