*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Exterior lighting
Both daytime running lights have progressively changed from white to yellow and lost intensity. The discoloration began on one side and later appeared on the other, concentrated at the lower angled section of the daytime running light. There are no warning lamps, messages, or stored fault codes. Independent automotive lighting specialists who service this model describe the cause as heat from the daytime running light LED degrading the end of the clear light-guide tube inside the sealed headlamp assembly. The manufacturer does not sell that LED board or light guide separately, so the only available repair is replacement of the entire headlamp assembly. A manufacturer technical service…
Aug 1, 2026Electrical system
While operating the vehicle under normal driving conditions, the vehicle suffered an immediate, un-commanded loss of engine power and throttle response. The vehicle displayed a critical dashboard restriction stating: âMaximum engine speed 2500 RPMâ, forcing an emergency limp-home mode that instantly created a roadway collision hazard. Simultaneously, the vehicle's primary safety and convenience systems dropped completely offline, displaying synchronized, consecutive malfunction alerts for the Central Locking System, Audi Pre Sense (Distance Monitoring), Cross Traffic Assist, and Lane Change/Blind Spot Warning systems. A subsequent professional diagnostic scan confirmed that the…
Sep 10, 2026Electrical system
The vehicle went in for a software update. After purchasing the vehicle, the software update was part of a recall. Since that recall was performed, my vehicle has a lot of electronic glitches and a lot of issues. My external Morty just got done, paying $4500 to track down a central locking issue on top of the electronic issues. Did not fix the issue. I am out of town going to see family in California. The vehicle central locking air came back up. I could not get out of the vehicle lock and unlock went out work. Also, the door handles would not work me and my daughter had to climb out of the car windows to get out. So like, you know what? And then we had to try to access the battery…
Sep 4, 2026Unknown or other
My 2021 Audi A6 produces a strong mold and mildew odor from the HVAC/air conditioning system. The smell occurs consistently after the air conditioning is turned off and persists when entering the vehicle. The issue appears to originate from mold growth on the evaporator coil or dampers, likely caused by moisture accumulation and inadequate condensate drainage in the HVAC system. The vehicle was inspected and treated at an authorized Audi dealership; however, the treatment did not resolve the issue and the odor returned. Online owner forums and communities document the same problem across multiple Audi models and model years, suggesting this is a systemic design or manufacturing issue rather…
Apr 1, 2026Engine and engine cooling
The contact owns a 2021 Audi A6. The contact stated while driving at an undisclosed speed, the vehicle overheated. The engine overheating and the low coolant warning light illuminated. In addition, the engine seized. The vehicle was taken to the dealer where it was diagnosed with a coolant leak and a failed coolant pump vacuum. The contact was informed that the coolant pump vacuum assembly needed to be replaced. The vehicle was not repaired. In addition, the contact was informed that the failure was a known failure of the vehicle. The manufacturer was made aware of the failure and a case was filed. The contact was advised to contact the NHTSA Hotline and report the failure. The failure…
Mar 10, 2026 · 80,000 milesEngine
Thermostat housing and oil cooler bracket leaking coolant with only 56k miles on the car
May 5, 2026Power train
I was driving my vehicle when the engine surged and then a transmission warning light came on and there was an immediate and complete loss of drive power. After the vehicle glided to a stop, there was no drive transmission in either forward or reverse. There was no pre-warning and no earlier incidence that led up to this issue. The vehicle is five years old with 39,834 miles and has had all routine maintenance and mileage interval services performed at the dealership, including its recent (Dec-25) 40,000-mile service. Thankfully this complete failure occurred when I was in my neighborhood and travelling 20mph; otherwise, the results could have been catastrophic had it occurred on a…
Apr 4, 2026Electrical system
My alternator was not working and it was a recall and I paid to fix it and they donât wanna pay me back. I got a new part from audi and fix it at the shop and they donât wanna pay anything just called and she said we donât pay only if heâs done at the dealer. And I donât believe that! Bc dealer told me they pay if I fix it any where to get done quick bc was out stock
Feb 18, 2025
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.
