Mileage / Regen Notes

This fault indicates the DPF soot load has exceeded normal thresholds, which typically triggers more frequent active regen requests. The system will continue attempting active regens but may have difficulty completing them if the underlying cause is duty cycle related. If soot load continues to climb, the ECM may inhibit active regen and require a parked (stationary) regen to safely burn off accumulated soot. Technician-forced parked regen via scan tool is usually required to reset soot load once this code is active. Monitor regen inhibit status — if other faults are present, active regen may be locked out entirely.