What 11 owners told NHTSA about the 2021 Audi SQ5

While driving at normal operational speeds, the vehicle suffered a sudden, un-commanded, and catastrophic loss of motive power while navigating a live traffic intersection. The transmission completely disengaged all gears without warning, rendering the vehicle entirely stationary and immobilized in the path of oncoming traffic. This failure created an immediate, severe safety hazard, exposing the occupants to a high risk of a side-impact or rear-end collision due to the inability to clear the intersection under the vehicle's own power. The vehicle had to be flatbedded to an authorized dealer (Audi - Glenwood Springs). The professional diagnostic evaluation confirmed an internal failure of the transmission assembly and Transmission Control Module (TCM) / Mechatronic unit, requiring a total replacement of the powertrain assembly. The failure occurred at 59,000 miles.

NHTSA ODI 11745096

My car has a known issue with a piston skirt defect that can cause engine failure. Audi of America acknowledged this issue with the EA839 and only warranted an 80k mile warranty. I am outside of that warranty and in risk of catastrophic engine failure that could lead to safety issues on the road. I am worried about my safety in driving this vehicle. Audi of America refuse to cover my car as it is outside of the extended warranty. There are numerous people that have the same issue as several models with the same EA839 engine and are prone to this failure.

NHTSA ODI 11735402

Component/System: Engine and Cooling — Water Pump / Coolant System Vehicle: 2021 Audi SQ5 Engine Code: CWGD Mileage at Failure: 71,000 Date of Incident: 8/6/2025 Audi Denver I’m reporting a known defect affecting my 2021 Audi SQ5 with engine code CWGD. The engine experienced an internal coolant leak from the water pump housing, which is a known issue previously acknowledged by Audi in TSB #19Q5 2022 01, covering earlier 3.0T engines (DEWA/DEWC). Although my engine (CWGD) is not listed in the bulletin, the failure is identical in nature: the plastic thermostat/water pump housing fails internally, leading to coolant loss and potential engine overheating. This issue is widespread among Audi 3.0T engines, including CWGD, and poses a risk of engine failure and overheating. Audi has extended the warranty for earlier engine variants but refuses to cover mine, even though the defect and consequences are the same. This inconsistent coverage leaves owners like me exposed to high repair costs for a clearly known design flaw. I am requesting that NHTSA investigate whether Audi’s CWGD engines should also fall under the scope of the extended warranty or safety defect coverage already applied to DEWA/DEWC engine variants. Audi’s selective VIN or engine code exclusions appear arbitrary and may allow known safety-related failures to go unaddressed. Documentation available: dealer inspection report confirming internal water pump leak, warranty denial letter, and TSB copy.

NHTSA ODI 11678890