J1939 FMI codes 0–31
The FMI tells you how something failed. Descriptions are written in our own words.
| FMI | Meaning |
|---|---|
| 0 | Value too high (most severe) |
| 1 | Value too low (most severe) |
| 2 | Data erratic, intermittent, or incorrect |
| 3 | Voltage above normal or shorted high |
| 4 | Voltage below normal or shorted low |
| 5 | Current below normal or open circuit |
| 6 | Current above normal or grounded circuit |
| 7 | Mechanical system not responding or out of adjustment |
| 8 | Abnormal frequency, pulse width, or period |
| 9 | Abnormal update rate |
| 10 | Abnormal rate of change |
| 11 | Root cause not known |
| 12 | Bad intelligent device or component |
| 13 | Out of calibration |
| 14 | Special instructions |
| 15 | Value too high (least severe) |
| 16 | Value too high (moderately severe) |
| 17 | Value too low (least severe) |
| 18 | Value too low (moderately severe) |
| 19 | Received network data in error |
| 20 | Data drifted high |
| 21 | Data drifted low |
| 22 | Reserved |
| 23 | Reserved |
| 24 | Reserved |
| 25 | Reserved |
| 26 | Reserved |
| 27 | Reserved |
| 28 | Reserved |
| 29 | Reserved |
| 30 | Reserved |
| 31 | Condition exists / not available |