NHTSA complaint #11767711

Owner complaint summary

Vehicle Information: 2021 Audi Q5 Component Affected: Electrical System / Electronic Control Unit (Body Control Module / BCM2) Description of Safety Defect: The vehicle suffered a catastrophic failure of the Body Control Module (BCM / BCM2) caused by water ingress originating from a defective rear sunroof drainage tube assembly. The manufacturing failure of the panoramic sunroof drain allows water to pour directly down the vehicle's interior D-pillar. Because of a severe design flaw, Audi positioned this highly critical central electrical computer completely unshielded in the exact cargo cavity where this water runoff pools. When the Body Control Module shorts out due to this water ingress, it creates an immediate and severe safety hazard. The vehicle experiences sudden, unpredictable electrical malfunctions while in motion, including the risk of uncommanded engine shutdown, a total loss of exterior lighting, failure of the central locking safety systems, and a disabled key transponder system. Audi is fully aware of water ingress vulnerabilities affecting central modules in the floorboards and cargo areas of this platform (as evidenced by NHTSA Recall 90S9 for the Gateway module). However, they have failed to address this identical engineering hazard impacting the BCM in the rear cavity. Leaving an unshielded, critical vehicle operating computer vulnerable to known body leaks exposes occupants to sudden component failures at highway speeds. I am requesting that the NHTSA launch a formal investigation into Audi's BCM placement and sunroof drainage defects to compel a mandatory safety recall.