2019 Audi Q8: sudden loss of power

Filed Nov 3, 2026 · Engine, Fuel system · GA

I am reporting a serious and recurring safety issue involving my 2019 Audi Q8. The vehicle has experienced repeated engine system malfunctions that have ultimately resulted in complete engine shutdown while driving. The first incident occurred when the vehicle would not start and displayed an “Engine System Malfunction” warning. I was able to get the vehicle operational and bring it to the dealership, where the fuel pump was replaced. Just three days after the repair, the same problem returned, requiring the vehicle to be towed back to the dealership. The dealership cleared the diagnostic code and kept the vehicle for approximately three weeks before returning it to me, stating that the issue had been resolved. A few days after receiving the vehicle back, the malfunction occurred again. This time, the engine completely shut off while I was driving at highway speeds. This created an extremely dangerous situation, as the sudden loss of engine power at highway speeds presents a significant risk of a crash, particularly in traffic or while attempting to maneuver out of danger. The vehicle is currently completely inoperable, and the underlying issue remains unresolved despite multiple dealership visits and attempted repairs. I am concerned that this recurring malfunction represents a significant safety defect that could affect other Audi Q8 owners. The possibility of an engine unexpectedly shutting down while traveling at highway speeds presents an unacceptable safety risk. I am requesting that this complaint be documented and investigated to determine the underlying cause and whether other vehicles may be affected.

Filed Apr 30, 2026 · Engine · FL

I own a 2019 Audi Q8. The vehicle was in the dealership’s possession for approximately three (3) weeks for service. During that time, I was not informed of any significant mechanical concerns or issues. After retrieving the vehicle, it displayed an oil pressure warning while in operation. I immediately returned the vehicle to the dealership for evaluation. At that time, the dealership added oil (“topped off” the vehicle) and released it back to me without identifying or addressing the underlying cause of the warning. Following this, I made multiple attempts to have the vehicle properly diagnosed. I experienced difficulty obtaining assistance, including calls being disconnected, and I was not provided meaningful support or a thorough evaluation of the issue. Shortly after leaving the dealership, the vehicle began producing abnormal knocking noises and rapidly became unsafe to operate, requiring it to be towed. This situation presents a significant safety concern, as a sudden loss of power or drivability while driving can increase the risk of an accident, particularly in traffic conditions where maintaining speed is necessary. The condition has since been confirmed by a service provider as a major mechanical failure. Additionally, I have received documentation from the manufacturer indicating a known issue related to piston skirt defects associated with this vehicle. Despite the vehicle being in the dealership’s possession for an extended period, this issue was not identified, diagnosed, or addressed. I was also not provided clear assistance or guidance regarding potential warranty consideration related to this known issue. The vehicle is currently available for inspection upon request.

Filed Sep 30, 2025 · IL

Faulty water pump → allowed coolant to migrate into the vacuum lines (a place coolant should never be). •This led to turbo underboost faults (loss of power) even though the turbo itself is fine. •The contaminated vacuum system now requires replacement of the vacuum shut-off valve and possibly other vacuum components. •Because of how the parts are placed, the repair requires removing the front bumper, and once it’s reinstalled, the safety systems/sensors must be recalibrated.

Filed Nov 23, 2023 · Electrical, Steering · TX

While driving warning light came on electrical malfunction on highway cat lost all power following a series of light’s indicting multiple malfunction then transmission disengaged I was able to coast to a stop , was unable to get out of vehicle due to car not unlocking

Filed Apr 5, 2023 · Electrical, Engine · AZ

Electrical malfunction illuminated on the dash than brake malfunction illuminated than the vehicle lost all power no power to windows locks but I was able to roll off an exit and waited for a tow truck to tow to nearest dealer

Filed Feb 17, 2023 · Electrical, Engine · NH

On 12/12/2022 I was driving and the Q8 lost power and I coasted to a stop. All lights on driver panel were flashing or sequencing through. After sitting on the side of the road for 5 or so minutes I tried starting the car again. This time it started and I drove another 8 miles almost to my home when the car again just died in the road. This time I couldn't get it to restart. I had to have it towed to my local garage as my dealership was an hour and fifteen minutes away. The car has been diagnosed with needing an alternator, which no one including the dealerships have because this is a problem with many vehicles. It has now been over two months without my car.

Filed Dec 25, 2022 · Electrical, Engine · NC

Vehicle lost all power and control while driving 45mph. First electrical system failure warning came on. Within 2 minutes the transmission slipped into neutral and 15 seconds later the vehicle lost power and I coasted to a stop. I was told by Audi dealership service that the starter generator failed. They mentioned they currently have over 20 vehicles in their shop and over 25 at their other location with the same problem. They also said over 1,000 cars nationwide had same problem and the part to repair is back ordered and no reasonable estimate of repair time.

Filed Mar 13, 2020 · Acceleration, Engine · 11 miles · NY

The car will unpredictably lose all power for 2-3 seconds. This has more than once nearly caused a fatal accident!!!!!!! The manufacturer is aware of the problem but unable or refusing to fix it. Please save lives today and recall the car.