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 mileage was approximately 80,000.

Source: NHTSA complaint ODI #11736958 · view all complaints for this vehicle at nhtsa.gov

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 compartment to do a hard reset. The vehicle is scheduled to go back to the manufacturer dealer to look at it again next week. However, I will be contacting audi u s a again. Since I told him I had all these issues, they refused to help me out in any way. This is a very big safety issue.

Source: NHTSA complaint ODI #11762289 · view all complaints for this vehicle at nhtsa.gov

The Audi Pre-sense is activated by weather. I was driving during a thunderstorm and Audi Presence activated causing the car to come to a hard stop due to precipitation. It happened again backing out of my driveway the Audi Pre-sense was activated and the car came to a hard stop. I thought I had back into another vehicle. This is very dangerous.

Source: NHTSA complaint ODI #11680304 · view all complaints for this vehicle at nhtsa.gov

Sunroof spontaneously shattered while driving. No other cars around when this occurred. Caused a very loud BANG. Was driving on the freeway when this occurred. Dealer would not confirm issue was spontaneous - felt something must have hit the car to cause this. No defined impact location on roof. Also, roof glass was pushed up in the middle instead of down like would be expected if something hit it from the outside. No warning before it occurred.

Source: NHTSA complaint ODI #11485934 · view all complaints for this vehicle at nhtsa.gov

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 than an isolated incident. A passenger in the vehicle — a minor child with a documented mold allergy — has experienced allergic reactions as a result of exposure to the vehicle's air conditioning output. This constitutes a health and safety concern. The mold contamination in the HVAC system poses a risk to vehicle occupants, particularly those with respiratory conditions or mold sensitivities. I am requesting that NHTSA investigate whether a defect exists in the HVAC/evaporator system design across Audi vehicles, and whether a safety recall or technical service bulletin is warranted.

Source: NHTSA complaint ODI #11738142 · view all complaints for this vehicle at nhtsa.gov