AUDI Complaints

Water pump design failure caused a leak of coolant into vacuum lines preventing coolant from cooling engine and causing immediate overheating. Known issue previous class action lawsuit.

While driving my brand new 4-day old 2025 Audi Q3 at highway speeds, the vehicle suddenly lost engine power and shut off without warning. At the time of the incident the fuel gauge indicated approximately 1/4 tank remaining and there were no prior warnings. I was forced to pull over in traffic, creating a dangerous situation. The vehicle had to be towed to the dealership. I was initially told the vehicle had "run out of gas", despite the fuel gauge showing fuel remaining. This same failure occurred a second time under similar conditions, again while driving at highway speeds with fuel indicated on the gauge. The vehicle stalled and shut off unexpectedly, requiring another tow. During the second repair visit, Audi technicians confirmed that the fuel tank's internal level sensor was defective and that the vehicle was inaccurately reporting fuel levels. Audi's Technical Assistance Center instructed the dealer to replace the entire fuel tank assembly on this brand-new vehicle. This defect caused repeated loss of engine power while driving, creating a serious safety risk to myself and other motorists. I no longer feel the vehicle is safe to operate due to the risk of sudden stalling without warning.

An Audi dealer has just diagnosed my 2018 S5 Cabriolet Prestige with vacuum system contamination caused by water pump failure. I had requested the diagnostic due to small coolant leaks on the engine and loss of coolant in the expansion tank. No warning lights and no overheating yet. Not yet aware of any loss of performance. I have been advised it is unsafe to continue driving the car. Dealer has quoted me $7800 estimate to repair the car. Purchased the car in 2021 as a Certified Pre Owned vehicle, and it now has about 84K miles on the OD.

Brand new car, needed a major software upgrade, for engine code, no heat , safety system flashing. It’s going back to the dealer today , for faulty gps and limited camera view for speed signs. The car has major software issues

evap canister keeps throwing check engine light even after replacement of all components

This vehicle Misrecognizes intersections on two lane highways and causes the vehicle to unexpectedly slam on its brakes without warning in anticipation of an intersection that either does not exist or where my vehicle has the entire right way. this behavior has persisted since the date of purchase and has not been corrected at all. Audi has confirmed that the vehicle is operating as designed however, I have personally almost had two major traffic accidents when this system engaged in the process of overtaking a vehicle, slamming the brakes and almost causing a accident where he and I was rear ended. This is not a vehicle. I would let a child learn how to drive in.

I purchased the Audi Q4 Etron new. The issue that I'm bring up is 'self-acceleration' I had the intial incident 10/2025 where the car self accelerated (Audi Case open) but can't reproduce which almost pin a kid between my vehicle and another vehicle. I was able to react quickly to prevent a death. Second time 'self-acceleration" was on 3/27/25. My son pulling into garage with my sitting next to him, the car self accelerated after coming to complete stop, jumped a pakring block and crashed into my garage wall. Dealer had the car for 2-3 weeks and still couldn't replicate. Third incident was 10/30/25 while at a complete stop in traffic leaving a parking lot, the car was at complete stop and 'self-acclerated' into the vehicle in front. This incident caused my vehcile to be total-loss by insurance. Audi case was also open and they said no fault and told me it's an insurrance matter. I believe there are many cases like mine and they are aware. There are lots of discussion on the defective 'self-accelreation' on Audi Q4 Etron. take a look at this link "https://www.reddit.com/r/etron/comments/16ta6qe/beware_of_the_q4_etron_sudden_acceleration/"

The rear brake lights on my 2019 Audi SQ5 stopped functioning due to a failure of the Comfort System Central Control Module (J393). This defect is documented by Audi in Technical Service Bulletin 2055123/5 and earlier versions. The malfunction causes the “rear lighting warning” to appear in the instrument cluster, and the brake lights do not illuminate when the brake pedal is pressed. The issue is not related to bulbs or wear-and-tear; it is caused by a software defect in the vehicle’s body control module, which results in loss of communication with the rear-lighting system. The failure occurred at approximately 73,000 miles, but the defect existed earlier and is acknowledged by Audi in the TSB. Because brake lights are a federally required safety system, the vehicle cannot be safely operated until this defect is corrected. The dealership confirmed the issue and advised that the required repair is a software update to the control module. Audi has declined responsibility, leaving the vehicle unsafe to drive. This is a safety-critical defect involving a known software failure that disables brake lights, increasing the risk of rear-end collisions.

I purchased a new 2025 Audi Q3 8/18/25 and immediately experienced a potential safety issue with the driver’s seat. The seat structure did not provide stable or secure support, which affected my ability to maintain proper posture and full control of the vehicle while driving. This created concerns about safe operation, particularly during braking, steering, and longer periods of driving. I reported the issue promptly and requested a warranty inspection. However, Audi of America issued a formal denial on October 9, 2025 without performing any inspection of the vehicle or the driver’s seat. As a result, the vehicle was never examined by an Audi technician, manufacturer representative, or any third party. Because the manufacturer refused to inspect the component and I could not safely operate the vehicle, I was forced to exit the vehicle entirely. The lack of inspection prevented any determination of the root cause, potential defect, or safety risk. This procedural failure is the basis of this report.

While driving my 2021 Audi Q5, the vehicle experienced a sudden transmission disengagement without warning. The vehicle behaved as if it had shifted into neutral while in motion. When this occurred, pressing the accelerator produced no response — the engine would not rev and the vehicle would not accelerate. This created a serious safety risk as it occurred during normal driving conditions and could have resulted in a collision. After stopping the vehicle and shifting into Park and then back into Drive, the transmission temporarily re-engaged. The issue reoccurred multiple times. Prior to one of the failures, the vehicle hesitated and bucked when starting from a stop. A warning message later appeared stating: “Transmission malfunction. You may continue to drive but will be unable to reverse.” The vehicle was taken to an authorized Audi dealership. Audi of America approved replacement of the transmission control module (mechatronic unit); however, this repair did not resolve the problem. After repeated failed adaptations and diagnostics, the dealer confirmed that the entire transmission requires replacement, citing internal gear set failure. The dealer documented that: Basic transmission settings and adaptations were attempted at least five times The failure consistently occurs at the same gear position A similar Audi Q5 case required full transmission replacement Audi Technical Assistance Center instructed the dealer to replace the transmission Despite this, Audi of America has refused further assistance due to the vehicle being slightly outside the standard warranty period, even though the mileage is extremely low and the failure is safety-related. This appears to be a defect involving the Audi S-tronic transmission, as similar complaints have been reported by other owners. The sudden loss of propulsion while driving presents a clear safety hazard. Safety Impact Sudden loss of acceleration while driving No throttle response during failure Occurred wit