SPN 101 means Engine crankcase pressure data is not good.
- FMI 0 – data valid but above normal – most severe
- FMI 2 – data erratic
- FMI 3 – voltage above normal
- FMI 4 – voltage below normal
- FMI 15 – data valid but above normal – least severe
- FMI 16 – data valid but above normal – moderately severe
Can be caused by:
- crankcase vent filter clogged
- pressure sensor failed
- crankcase vent issues
- high air intake restriction
