The dash displayed “DPF full – see your dealer,” with the check engine light illuminated.

The vehicle drove normally but would not perform a regeneration. Fault codes P2458 (DPF regeneration duration) and C1201 (engine control system, reported through the ABS module) were stored. Attempts at forced regeneration failed, with the system reporting regeneration duration too short. Even after clearing codes, the DPF fault and warning lights returned immediately.