SERVICE ACTION: OPTIMIZING THE WATER DRAIN. The water drain in the engine compartment's passenger side cowl near the firewall may be inadequate during exceptionally high water volumes. Water can accumulate and not drain out quickly enough. This can result in various Check Control messages and the failure of various systems such as: Park Distance Control (PDC) Dynamic Stability Control (DSC) Windshield washer This may be caused by one or more parts: Lack of a cowl drainage shaft cover Lid on the ventilation microfilter housing lacks water drainage channels (only on vehicles prior to July 2013 production).
