Do not driveTo the nearest safe stop
J1939 code SPN 1807. Below — how the fault is worded at the factory by Bendix ABS/ESP, Meritor (ex-WABCO) and WABCO ABS/ESC, and what the second half of the code (FMI) means in the standard.
Bendix ABS/ESPMeritor (ex-WABCO)WABCO ABS/ESC
| FMI 2 | SAS Static Signal; SAS Signal Out of Range; SAS Signal Reversed; SAS Gradient Error; SAS Long Term Calibration Error; SAS Plausibility Check (Ref Yaw Rate) |
| FMI 9 | SAS CAN Timeout |
| FMI 12 | SAS Invalid Signal |
| FMI 13 | SAS Not Calibrated; Steering Angle Sensor Calibration Not Finished |
| FMI 0 | Signal Offset Failure of Steering Wheel Angle Sensing |
| FMI 2 | Steerwheel Plausibility Check; SAS Signal is Not Plausible Detection 1) |
| FMI 9 | Steering Wheel Angle Minimum Dynamic Failure |
| FMI 12 | Error Indication of SAS Signal |
| FMI 13 | Failure Detection 'OverEquipped' for Steering Angle Sensor |
| FMI 14 | Constant Message Counter of SAS CAN Message |
| FMI 17 | Signal Not Available Indication of SAS Signal |
| FMI 18 | Neutral Value Detection (Steerangle) |
| FMI 31 | Invalid Status of SAS Signal |
| FMI 1 | SAS Offset Fault |
| FMI 2 | SAS Not Plausible |
| FMI 7 | Steering Ratio Fault |
| FMI 8 | SAS Calibration Fault |
| FMI 9 | SAS CAN Fault (temp) |
| FMI 12 | SAS Failure |
| FMI 13 | SAS not Calibrated |
| FMI 14 | SAS Internal Fault |
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.