2021 Audi Q8 Electrical Problems

Belt Starter Generator failure rendered car undrivable -- power steering failed while in motion. Issue is subject to Class Action Settlement in USDistrict Court, Case # 3:23-cv-02291-RK-RLS. But this should have been a recall because of danger of Injury or Death. A recall would provide notice that the notice of settlement failed to provide. This failure happened to me on March 29, 2026. Dealer is not able to do the repair work in a timely manner.

NHTSA ID

11727957

Incident

Mar 29, 2026

Purchased my car used from Volkswagen of west islip. After a few months I was doing regular maintenance when I noticed that the brake sensor was missing and the harness was tampered with. The brake wear sensor was removed from the front driver side and a small price of wire/ conductive material was inserted into the harness to trick the cars system into on seeing the sensor in a safe and working manner. This would prevent the cars system from alerting me when the brakes need to be replaced which could have resulted in resulted in a serious accident due to brake failure. I feel like this was either deliberately done by the dealer before selling the car to save a few dollars or was overlooked during what should have been a basic safety inspection before listing the vehicle for sale. After reaching out to the dealer- they refused to fix the issue.

NHTSA ID

11672145

Incident

Jul 2, 2025

On April 2, 2025, while driving on Interstate 25, my 2021 Audi Q8 Premium Plus experienced a catastrophic engine and electrical failure. This included the generator system failing, which resulted in a complete loss of power, disabling all active safety systems (including electronic stability control, braking assist, and lane monitoring), as well as basic driving capabilities such as acceleration and steering responsiveness. The incident occurred without prior warning or diagnostic alerts, and the vehicle became immobile on the highway. The situation posed a serious safety hazard to both myself and surrounding drivers. The vehicle had an unresolved generator recall, which Audi later confirmed and completed after the incident. This event raises significant concerns regarding system reliability and pre-failure alert mechanisms in the Q8 platform.

NHTSA ID

11656169

Incident

Apr 2, 2025

I had purchases a 2021 Audi Q8 from Carmax on 10/16/2024. There was a time that I was driving at 35 mph in the left lane which I had my signal on to proceed in the turning lane when the car went into park and the crash indicator was on. I was jerked by the force. I also notice when you turn the car on there was a knocking sound. I had taken the vehicle into Westmont Audi on 11/22/2024. They had checked it out and said the noise was normal. I advised them to do a complete inspection on the vehicle while it was under warranty to make sure there was no other issues. They said everything looked great and that there were no codes. They don't know why the car had stopped. They did the 50k inspection as well. After that I start to experience indicator on for Intersection assistant malfunction please contact service, Audi pre sense; currently limited see owner's Manuel, and Rear Cross-Traffic assist: Malfunction, please contact service. At first thought it was normal but then it was persistent. On 2/11/2025 the check engine light had come on. I called the dealer on 2/12/2025 first thing in the morning. They advised me that it will be under warranty. I had dropped the car off to Westmont Audi and we went over the issues the vehicle was having. They informed me that it was under warranty. Once I left, they called and said it will not be covered. According to their investigation its two software that have to be updated. One for the pre sense and other for a misfire. The vehicle drags to pick up speed. This vehicle has been nothing but problems. The vehicle is not safe to drive because it is not 100% working properly the software's along with other issues. Also, I had them do a scan on the vehicle and there were so many codes on which I have attached them. It now will cost over $500.00 in repairs.

NHTSA ID

11642501

Incident

Feb 6, 2025

High beam assistant: Malfunction

NHTSA ID

11612046

Incident

Aug 16, 2024

I wish to report a critical safety issue with our Audi Q8, which experienced a complete electrical failure while traveling at 65 mph on the freeway on [XXX]. The warning indicators transitioned from yellow to red before the vehicle lost all functionality, including turn signals and emergency blinkers, posing a severe risk to my family and other motorists. We managed to coast to the roadside without incident, but the potential for a catastrophic outcome was alarmingly high. Audi has identified the problem as an alternator defect, which is apparently a known issue covered under an extended warranty for Audi Q8 2019-2022 for 7 years unlimited miles. However, the policy to address this defect only upon failure is unacceptable and dangerous. This malfunction could reoccur at any time, significantly endangering everyone on the road. Importantly, we frequently tow an Airstream trailer with our Q8. Had this failure occurred while towing, the consequences could have been disastrous on a large scale, endangering not only our family but also other road users due to the increased risk of a multi-vehicle collision, tipping over of Airstream or the Q8 if hit by vehicle who didn’t The replacement part's minimum of 3-8+ weeks wait time exacerbates our concern, leaving us without a vehicle or ability to use our Airstream which is one reason why we purchased the Audi Q8. I am aware of similar incidents of this failure in SF Bay Area across the past 4-6 months, underscores the need for immediate investigation and action to prevent future occurrences. We frequently travel on challenging routes like [XXX] in California as we own a home in Santa Cruz highlight the urgent need for a reliable vehicle. The thought of such a failure under those circumstances on a routine drive home or while towing, is unthinkable but could have happened to us at anytime. We urge the NHTSA to investigate this matter thoroughly to ensure the safety of all Q8 drivers public. Sincerely, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATIO

NHTSA ID

11576760

Incident

Mar 11, 2024

The alternator on my Audi Q8 SUV died AS I WAS DRIVING IT, leaving my vehicle with no power. I was left to coast down the 50-60 MPH highway I was driving on into a turn lane, where the vehicle stopped and could not be restarted. My safety was put at risk because I was on a highway in a car that stopped operating suddenly and catastrophically. If I had not been able to coast into a turn lane, the car would have left me in a high-speed lane. I waited for a tow truck over two hours, the first hour inside the vehicle, the second outside on a small concrete lane divider. The last hour I spent directing live traffic to slow down and pass my vehicle, which was in the left-turn lane, and whose warning flasher lights had ceased working when the battery was depleted. The vehicle was towed to an Audi service department, where the vehicle was inspected, the failure diagnosed, and the failure corrected by replacing the alternator and recharging the battery. The first symptom of any problem was an error message the evening before when hands-free entry was denied (I had to use my key fob to enter the vehicle instead of placing my hand inside the door handle). Also, the dashboard displayed an error message directing me to contact a service department. In the morning, I called my local Audi service department to report the issue and was given an appointment time for the following morning. I had errands to run, so I took the vehicle on the aforementioned highway, when error messages indicating the loss of availability of various electrical and safety systems (e.g., Lane Departure warning, Lane Assist, Park assist, etc.) began to flash suddenly, one after the other, on my dashboard. The battery icon began glowing first yellow, then red, then flashing between yellow and red. There was one more message about the transmission being in trouble and that I should stop the car safely. At that moment, I lost powered forward propulsion and began to coast, as indicated above.

NHTSA ID

11565007

Incident

Jan 8, 2024

The alternator was having malfunction in the middle of driving. At first, the system warned and showed" Electric system malfunction" with yellow lights on. As soon as I saw this warning, I drove to the nearest dealership which is about 15 mins drive. Two minutes before my wife and I arrived at the dealership, the car have many red lights warning turned on one by one. The system asked me to stop safely. And the entire system shut off by itself after we arrived at dealership. Luckily, we were able to drove the car to the service department. I can not image what could have happened it the car broke down on the highway. The engine could be completely shuts down. And there is no even no way to turn on the engine and turn on emergency lights.

NHTSA ID

11559071

Incident

Dec 6, 2023

While driving the 2021 Audi Q8, the warning lights for the Electrical system malfunction & Automatic vehicle starting system: malfunction appeared on the dashboard. My safety and others safety were at risk as this occurred while driving. In reviewing other concerns or complaints this is a reported issue to the Audi dealership. Audi Grapevine Service was immediately notified. Service informed me to do not drive the vehicle and to have it towed in immediately. Audi Grapevine Service also informed me they have 17 other vehicles with the same issue. Vehicle is currently at dealership awaiting diagnosis. There is another reported issue, of knocking noise coming from the vehicle. This was reported to the dealership on 9/25/2023, 26 days after purchasing the vehicle. This was also reported to Audi Customer Care, on 10/12/2023, after the dealership provided no follow-up of repair of issue. Verbal communication from dealership states there is no fix at this time awaiting a fix/follow-up from Audi Manufacturer. Per Audi Grapevine Dealership they've experienced this issue with other Audi Q8.

NHTSA ID

11554630

Incident

Nov 10, 2023

Complete loss of electrical power while driving due to faulty alternator at only 35K miles. This resulted in total loss of steering, suspension failure, and any other electrical systems in the car. Making the car almost impossible to control specially for a new driver. Apparently the issue is widespread with any Audi car or SUV equipped with a V6 3 liter engine. The repair requires the replacement of the alternator and the 12v (an in some cases 48v) battery. The issue happens suddenly with no prior warning and completely disables the vehicle while driving. To the best of my knowledge Audi replaces the alternator with the same faulty design, which may lead to the issue to appear again at a later time.

NHTSA ID

11547234

Incident

Sep 21, 2023

Vehicle reported an electrical failure and to stop vehicle. Vehicle towed to dealership. Service reported Alternator failure and a 6-8 week repair time as part is on back order.

NHTSA ID

11546514

Incident

Sep 25, 2023

When driving, my car had several red and yellow warning lights that came one - one for electrical system, the other for Vehicle starting malfunction and another was a battery sign. The vehicle also had delays starting. I was fearful the car would stop while driving (hopefully not on a highway or busy road) or I would be stranded somewhere because the vehicle would not start

NHTSA ID

11546114

Incident

Sep 7, 2023

Oct 15, 2022 lights began flashing. Electrical Malfunction came up. Said to pull over safely as soon as possible. Dealership said it is not safe to drive. Is still at the Audi dealership since they could finally get it in Nov 16, 2022. It has 17,248 miles on it. Am told it needs a new Alternator/Generator and there is no expected timeframe. It is now Jan 20, 2023 and I have been without a car.

NHTSA ID

11502819

Incident

Oct 15, 2022