2022 Audi Q7

car in question is a 2022 Audi q7 55 tfsi - 3.0 turbo - 40k miles 2 owner. serviced at Audi since new. under warranty until 50k car throws a p0299 code - turbo underboost condition present - coolant migration from a faulty VW/AUDI water pump is sending coolant into vacuum lines causing catastrophic engine issues - car can not be driven. Audi will not fix under warranty and is trying to charge 5,800$ to replace waterpump/ associated lines. tells me the warranty "is for some items and not others" there is a class action lawsuit for a longstanding issue that Audi has been aware of since 2020 and not offering any solution for - Case No. 26-5678, NJ.

My 2022 Audi Q7 experienced an internal water pump seal failure that allowed engine coolant to migrate into the vehicle’s vacuum system, contaminating the vacuum reservoir, valve, and connected lines. This is a known failure pattern affecting Audi/Volkswagen vehicles equipped with the 2.9T/3.0T EA839 engine family, where the water pump’s internal design allows coolant to be drawn into the vacuum circuit undetected, since the leak is internal and not visible externally. This can affect brake booster vacuum assist and turbo/drivetrain systems depending on severity. The failure occurred outside of any accident or misuse, is a documented design issue in ongoing class action litigation against Audi/Volkswagen, and required extensive repair (water pump, vacuum reservoir, valve, and related lines) once diagnosed. I am filing this complaint to document the pattern of this defect.

I was traveling at highway speeds in active, high-velocity traffic when my vehicle suffered a sudden, catastrophic mechanical failure that nearly resulted in a severe multi-car accident. Without any warning, the vehicle completely lost its ability to accelerate, flatly refusing to pick up speed or maintain momentum despite pressing the gas pedal. ​This unexpected, immediate drop in propulsion marooned me in high-speed lanes, leaving the vehicle dangerously vulnerable as oncoming traffic rapidly closed the distance behind me. Drivers behind me were forced to aggressively swerve and brake to avoid a high-speed rear-end collision. Moments after this life-threatening loss of power occurred, the Check Engine Light illuminated on the dashboard. ​Subsequent technical inspection revealed a severe engineering defect: the internal seals of the factory coolant control components failed, forcing pressurized engine coolant backward into the engine’s primary vacuum system. This pressurized fluid completely contaminated the vacuum lines, the vacuum reservoir tank, and the electronic solenoids—including the N75 boost control solenoid. By filling the vacuum infrastructure with liquid coolant, the engine was instantly starved of its ability to regulate turbocharger boost, triggering a critical "limp mode" and a P0299 underboost fault. ​The catastrophic failure of an internal cooling seal directly compromising an active drivability safety system represents an unreasonable and severe defect. It transforms a routine drive into an immediate, uncontrollable highway hazard. I am filing this report because this known coolant migration pattern presents a clear, present, and life-threatening danger to owners operating this engine platform.

While parked in my residential garage with the engine shut off and car door closed, the vehicle suffered an un-commanded rollaway incident due to a suspected defect in the electronic parking brake or automatic-park transmission software. The vehicle was completely stopped, the driver exited the vehicle and the driver's door was closed. Moments later, the vehicle shifted out of its parked state or failed to hold, rolling backward down the driveway and colliding with a basketball pole in the driveway, causing vehicle damage. No warning chimes or dashboard alerts were observed prior to exiting. The vehicle's electronic failsafe to automatically engage 'Park' upon the door opening failed to secure the vehicle.

I drove home after shopping, opened my garage door by remote, and pulled into the garage. I placed the vehicle in park, and shut off the engine via push button. I retrieved my purse from the passenger seat and exited the vehicle. I exited the vehicle with the intent of retrieving my shopping bags from the rear hatch. As I walked towards the rear of the vehicle I noticed my next-door neighbor had stopped at the end of my driveway with the driver’s window down. I did not make it to the hatch door and instead walked to the end of my driveway. [XXX] was the only occupant of the car. He was the driver. We started talking for several minutes with my back to the garage the entire time until neighbor hollered “[XXX] is going on?” The last thing I remember is my Audi Q7 slamming my body into one or both vehicles. I was thrown to the driveway with my right foot wedged under the Audi Q7’s driver’s side rear tire. I worked my foot free from my shoe and got myself up to a standing position with clear pain in my back and foot. Vehicle rolled on its own with transmission in Park. Note: ~Vehicle transmission was in Park on a flat surface when I exited vehicle with car keys ~ I was stuck by vehicle, vehicle in question also struck another vehicle ~Not to my knowledge ~None of the agencies or companies have inspected vehicle ~No warning lights INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My car has suddenly tried to stop in the middle of an interstate highway. It happens when the adaptive cruise control is active. Even though the lane in front of the car is clear, a warning sign appears in the dash that the pathway is obstructed and the car tries to stop quickly. This has happened on this vehicle four times now. It happened on my previous Audi as well. At that time, the car was taken off the highway and the dealer would not return it to me for a period of six weeks. During this last incident, the dealer said that they searched the information in the car. I had provided the odometer reading and date to the dealer when it happened. I was told that there was no information found about any malfunction. Of course the car thinks that there is an obstruction there in front of me and thinks it is properly functioning and now error message is created. This creates an extreme hazard for accident on a busy highway. It is a recurring problem and should be investigated. I have uploaded a picture of the error message displayed in the instrument cluster. This is not a trivial problem.

My wife was driving the car with the adaptive cruise control set at 72mph on 5/11/2025. The milage on the odometer was about 37165. A car was close behind when suddenly on of the systems in my car slammed on the brakes and attempted to stop the car. There were no warning indicators to suggest why this had happened. My last Audi, a 2020 A6, did this as well. It had a number of safety systems malfunctioning around the same time. At one time, I was told by the Audi dealer that the car was unsafe to be driven and it would not return the car to me. It was impounded for about six weeks as I recall. Whatever the reason, this is a serious safety issue when an vehicle suddenly tries to stop at that rate of speed on a highway with other vehicles on the road.

I drove on [XXX] from Los Angeles towards San Diego in the morning. I followed the traffic in the middle lane and turned on the ACC, including the lane-keep assist, at the same time. The speed was set at 78 mph, but the traffic was moving faster than that. The distance was set to level 3 for ACC auto brake. After passing a speed limit sign, the head-up display suddenly showed a speed limit warning light, and at the same time, the vehicle suddenly braked and reduced speed to 65 mph. The vehicle behind me almost crashed into me. The ACC didn’t behave the same way as in the past, and I didn’t receive any notice from the dealer or manufacturer about this significant change. This could definitely be a major problem when using ACC in traffic. For example, if the traffic is moving at 80 mph and you set ACC at 80mph, when pass a 55 mph speed limit sign, the vehicle will quickly reduce speed to 55 mph, which could cause a serious problem for the cars behind. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2022 Audi Q7. The contact stated that the check engine warning light was illuminated. The contact stated that the failure was related to Technical Service Bulletin: 10244468 (Engine and Engine Cooling). The vehicle was taken to the dealer and was diagnosed and determined that the failure was an EVAP leak detection from the circuit with trouble code: T240700. The failure was confirmed and related to TSB: 10244468 (Engine and Engine Cooling). The vehicle was not repaired due to parts not being available. The TSB stated that parts would be available by the end of the 2nd quarter of 2024. The manufacturer was made aware of the failure and confirmed that the parts were not yet available. The approximate failure mileage was 20,000.