2019 Audi Q8 Powertrain & Transmission Problems

Due to a leak in the rear axle that is connected to the differential, it caused the entire differential to fail. The bearing within the differential completely failed due to contaminated oil. The Q8s are known to have this occur but only in year models 2020-2022. My Q8 is a 2019 and Audi is aware of these issues given technical service bulletins available but doesnt want to take responsibility as this may be a continuing manufacturing issue arising. My vehicle only has 65k miles on it and Audi admits this is rare. Due to a misdiagnosis in June of 2025 (oil leak), Audi of Seaside Monterey caused the complete failure of the differential in December of 2025 by not doing a deeper diagnosis earlier to resolve the catastrophic failure. This is a safety concern and very expensive. A new differential costs $12k which has been expected to pay with no accountability. I am currently in an active case with Audi Seaside and the BAR to come to a resolution.

Driving vehicle at a low/medium rate of speed, and car completely shut off without warning. Check engine light appeared after restarting the vehicle. This is the second time this has happened to me since November 2022. I filed a report then as well. This car should not be allowed on the road and Audi should be forced to buy it back. The vehicle has less than 35,000 miles. Dealer has not confirmed what the issue is this time.

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

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.

The Generator (Part #: 4N0903028P) failed causing the car to shutoff while driving. This is a known issue by Audi as it has issued a TSB. Further steps must be taken by the OEM to ensure safe operation of the vehicle by its owners. This is a safety issue that must be resolved soonest!

Electric System Mal Function. The Car was flashing all signals. It asked to pull over and said there is a danger of car turning over. We called audi assistance. The tow truck driver could not load the car as the wheels were all locked up.

I purchased a used 2019 Audi Q8 Prestige Plus, with Sportline Pkg on 9/7/21. Car had approx. 18,500 miles. The car attempts to shut off when deaccelerating at any speed below 3000 rpm. There is also a significant throttle delay between the time you push the gas pedal and when the engine responds. To be clear the car is in Dynamic mode and the Start/Stop mode is deactivated. It appears that under certain conditions the car is trying to determine if it should shut down or continue running. The Audi 37M6 update has been performed on my car which was supposed to correct the problem. The Audi Knoxville Shop Foreman drove the car and experienced the problem, contacted Audi Technical Assistance center (case# HS-822562) and was told that the car had the latest software correction. The Shop Foreman wanted to erase the transmission clutch adaptations to see if the car could relearn the shift process but was advised by Audi Technical Assistance not to erase the transmission clutch adaptations and would not allow the Shop Foreman access to the car software in an effort to diagnose the problem. Note: there was a class action lawsuit in May 2020 for this problem that was dismissed because the car manual states the car can experience a delay when restarting from the Start/Stop mode. However, my issue occurs when the Start/Stop system is turned off. There is no continuous throttle response below 3000 rpm with the Start/Stop system turned off. I was given a 2021 Q7 with a 2.0 as a loaner car while my Q8 was in service and I did not experience any of the issues I have with my Q8. I was advised by my dealership to also write a letter to Audi USA as the dealership acknowledges there is a major problem and they want to try fix the issue but will not be given access to the car software to troubleshoot the issue. This is a dangerous problem.

I'M VERY UPSET WITH NHTSA AND AUDI. I SUBMITTED A COMPLAINT WITH NHTSA ON 10/22/20 AND THE COMPLAINT NUMBER IS 11365744. AGAIN AS STATED IN MY COMPLAINT THIS IS AN ACTUAL SAFETY ISSUE. I THEN TOOK THE VEHICLE INTO THE DEALERSHIP FOR THEM TO LOOK AT THE PROBLEM. WELL IT TURNS OUT THAT THE DEALERSHIP'S SERVICE DEPARTMENT HAS HAD A NUMBER OF COMPLAINTS JUST LIKE MINE. IT ALSO TURNS OUT THAT AUDI HAS A FIX FOR THE PROBLEM. THE FIX IS A SOFTWARE UPDATE 37M6. I'M GLAD THE ISSUE HAS BEEN FIXED ON MY VEHICLE BUT THE REAL ISSUE IS THAT NHTSA AND AUDI ARE AWARE OF THIS FIX BUT BOTH OF THESE ENTITIES ARE NOT REQUIRING THE FIX TO BE MADE VIA A GOV'T ISSUED RECALL. AUDI CALLS THIS FIX A "CAMPAIGN". AUDI IS AVOIDING THE STANDARD PRACTICES OF NHTSA BY REFERRING TO THIS PROBLEM AND FIX AS A CAMPAIGN WHICH IS OUTSIDE OF THE NORMAL TECHNICAL SERVICE BULLETIN AND SAFETY RECALL PROCESS. HAS NO ONE AT NHTSA OR AUDI LEARNED THE LESSONS OF THE GM DEBACLE WITH THE IGNITION SWITCH. THIS COVER UP BY NHTSA/DOT AND AUDI IS A COMPLETE AN UTTER DISGRACE. TO ALLOW AUDI TO OPERATE OUTSIDE OF THE NHTSA SYSTEM IS A COMPLETE FAILURE. NHTSA NEEDS TO MANDATE AUDI ISSUE A SAFETY RECALL ASAP!

OUR A8 HAS ISSUES WITH LAG TIME WHEN ACCELERATING FROM A STOP OR A SLOW SPEED OF LESS THEN 10 MPH. THE VEHICLE SEEMS TO STOP RUNNING PRIOR TO A FULL STOP AND IF THE ACCELERATOR IS DEPRESSED NOTHING HAPPENS FOR ABOUT 5 SECONDS. THIS IS EXTREMELY DANGEROUS AND LEAVES US AT RISK OF BEING INJURED OR KILLED. THIS ISSUE STARTED JUST A FEW MONTHS AFTER PURCHASE AND HAS GOTTEN CONTINUALLY WORSE. WE HAVE ALSO ENCOUNTERED THIS ISSUE EVEN AFTER A FULL STOP AND THEN TRYING TO ACCELERATE FROM A FULL STOP. IT HAS EVEN HAPPENED WHEN DRIVING ON AN INTERSTATE HIGHWAY WHEN TRYING TO PASS ANOTHER VEHICLE. THE DELAY IN ACCELERATION IS VERY DISCONCERTING AND DANGEROUS TO SAY THE LEAST.*DT*JB

I LEASED THIS 2019 AUDI Q8 IN DECEMBER 2018 FROM MY LOCAL AUDI DEALER AND IT HAS HAD SO MANY TECHNICAL ISSUES FROM THE START. I'VE HAD IT IN FOR SERVICE ISSUES 5 OR 6 TIMES. IT KEPT SHOWING THE OIL SYMBOL AND SAID THERE WAS TOO MUCH OIL AND WAS CHECKED AND THEY SAID IT WAS JUST A COMPUTER ISSUE. THEN THEY REPLACED A PART AND IT HAPPENED AGAIN NOT LONG AFTER. THEY THEN CLAIM THE REPLACEMENT PART WAS FAULTY. SINCE THE BEGINNING, IT HAS HAD ISSUES ACCELERATING WHEN IT IS IN THE ENERGY SAVING MODE, WHICH IS DEFAULT AND YOU HAVE TO DISABLE IT EVERY SINGLE TIME YOU USE THE CAR. THE CHECK ENGINE LINE HAS BEEN ILLUMINATED MULTIPLE TIMES AND WHEN SERVICED, THEY CLAIM IT IS SAFE TO DRIVE AND THAT AUDI IS WORKING ON A COMPUTER FIX TO THIS PROBLEM. NOW THE "DRIVE SYSTEM: MALFUNCTION! PLEASE CONTACT SERVICE" LIGHT IS CONSTANTLY ILLUMINATING AS IS THE CHECK ENGINE LIGHT (PICTURE ATTACHED). THIS IS BY FAR THE MOST EXPENSIVE CAR I HAVE EVER HAD AND IT HAS HAD MORE ISSUES THAN ANY OTHER CAR I HAVE HAD. I'M NOW VERY CONCERNED THAT I AM PUTTING MYSELF AT RISK FOR DRIVING THIS CAR.

WHEN DRIVING IN ANY STANDARD DRIVING MODE, WHEN YOU START TO COME TO A STOP WITH AUTO S/S ENABLED (E.G. SLOW DOWN) TO LESS THAN 6MPH, THEN ACCELERATE AGAIN, THERE IS A CONSIDERABLE LAG FOR THE VEHICLE TO START ACCELERATING AGAIN (ABOUT 1-2 SECONDS). THIS IS ESPECIALLY DANGEROUS WHEN MAKING LEFT TURNS WHEN THERE IS CROSS TRAFFIC AS THE VEHICLE OFTEN DRIFTS INTO THE INTERSECTION AND YOU CAN'T QUICKLY ACCELERATE AWAY. HAVE HAD MANY CLOSE CALLS AND THE ISSUE IS EASILY REPLICABLE ON ANY 2019 Q8.

AUTO START/STOP IS SO LAGGY WHEN RE'STARTING THE ENGINE, ESPECIALLY AT LARGE CROSSINGS W HEAVY TRAFFIC OR ROUNDABOUTS. I HAD ALMOST 5 ACCIDENTS IN THE PAST YEAR BECAUSE YOU ANTICIPATE ONCOMING TRAFFIC AND FROM EXPERIENCE YOU KNOW YOU CAN EASILY TURN OR GO, AND THEN YOU JUST ROLL A BIT AND THERE IS NOTHING HAPPENING AND YOU HAVE NO CHANCE TO DO ANYTHING.

THROTTLE LAG FROM A NEAR (BUT NOT FULL) STOP. IF COMING TO ROLLING STOP, FROM 1-8 MPH, AND THEN HIT ACCELERATOR, THE CAR ENGINE REVS BUT NO ACCELERATION TO VEHICLE. AFTER A 2-3 SECOND DELAY, CAR WILL LUNGE AND ACCELERATE NORMALLY. SCARY WHEN NEED TO ACCELERATE FROM A NEAR ROLLING STOP. LEFT HAND TURNS ESPECIALLY DANGEROUS. EXPLAINED ISSUE TO DEALER, AND Q8 CAR FORUMS HAVE SAME ISSUE. DEALER SAYS FUNCTIONING "NORMAL", WHICH I DISAGREE IT IS NOT. I HAVE TRIED ALL SETTINGS FOR START/STOP, TRANSMISSION SETTINGS, ETC., AND NOTHING FULLY ALLEVIATES THE PROBLEM. THIS IS NOT EPISODIC AND A CONSISTENT, REPRODUCIBLE DANGEROUS ISSUE.

AUTO START/STOP IS TURNING OFF THE ENGINE AND PUTTING THE CAR IN NEUTRAL BEFORE THE VEHICLE IS COMPLETELY STOPPED. IF YOU NEED TO ACCELERATE SUDDENLY TO CLEAR AN INTERSECTION, IT TAKES A FEW SECONDS FOR IT TO START BACK UP AND MOVE THE VEHICLE. LIKE MOST PEOPLE DO, THE THROTTLE GETS PRESSED HARDER IN THE HOPES OF THE VEHICLE MOVING. BY THE TIME THE VEHICLE STARTS BACK UP I'M 3/4 TO THE FLOOR WITH THE THROTTLE WHICH CAUSES THE VEHICLE TO TAKE OFF LIKE A ROCKET. THIS IS OVERLY AGGRESSIVE START STOP IS DANGEROUS. IT SHOULD OPERATE LIKE OTHER SYSTEMS AND NOT SHUT OFF THE ENGINE UNTIL IT IS AT A COMPLETE STOP. I HAVE TAKEN MY CONCERNS TO MY LOCAL DEALER AND THEY TELL ME THAT IT IS OPERATING AS DESIGNED.

THERE IS A SIGNIFICANT LAG IN THE POWER TRAIN OF THE AUDI Q8 AFTER BREAKING TO A COASTING SPEED AND THEN ATTEMPTING TO ACCELERATE AGAIN. THE GAS PEDAL IS COMPLETELY UNRESPONSIVE FOR 2-3 SECONDS DURING THIS TIME. DANGEROUS DELAY IN THROTTLE RESPONSE DUE TO AUTO START/STOP OR MILD-HYBRYD SYSTEMS AND CAUSING VEHICLE TO COAST WHEN SLOWING DOWN AT A YIELD SIGN OR INTERSECTION ETC BEFORE TRANSMISSION RE-ENGAGES. THE VEHICLE IS POWERLESS FOR SEVERAL SECONDS DESPITE APPLICATION OF GAS PEDAL, CAUSING ONCOMING TRAFFIC TO POTENTIAL COLLIDE. ALREADY REPORTED TO AUDI SERVICE BUT THEY SAID IT'S NORMAL, WHICH I TOTALLY DISAGREE

SERIOUS SAFETY ISSUE WITH THROTTLE DELAY FROM DEAD STOP TO GET GOING; DOES NOT HAPPEN ALL THE TIME AND IT IS IMPOSSIBLE TO REPLICATE THE ISSUE; AUDI CLAIMS THEY DO NOT KNOW ANYTHING ABOUT THIS - MULTIPLE PAST COMPLAINTS. I WOULD NOT PURCHASE THIS VEHICLE UNTIL THIS IS RESOLVED. IT WILL KILL SOMEONE. *TR

WHEN START/STOP SYSTEM IS ENABLED, THE ENGINE WILL SHUT OFF WHEN COASTING TO A STOP. IF YOU TRY TO ACCELERATE IT TAKES 2-3 SECONDS FOR THE CAR TO ACCELERATE. THIS IS EXTREMELY DANGEROUS ON LEFT HAND YIELD TURNS WHERE THERE IS ONCOMING TRAFFIC. THIS PROBLEM CAN BE SOLVED BY TURNING OFF THE START/STOP SYSTEMS OR PUTTING THE TRANSMISSION INTO SPORT MODE WHICH WILL AUTOMATICALLY TURN OFF THE START/STOP SYSTEM. IN ADDITION, THE CAR DOES NOT REMEMBER YOUR SETTING WHEN THE CAR IS TURNED OFF. SO EVERYTIME YOU START THE VEHICLE YOU HAVE TO REMEMBER TO TURN OFF THE START/STOP SYSTEMS. AUDI DEALER ASKNOWLDEGED THE ISSUE AND PERFORMED UPDATE, BUT THE ISSUE STILL PERSISTS.

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.

WHEN TRYING TO ACCELERATE FROM A STOP THE CAR EXHIBITS A 3-4 SECOND DELAY BEFORE ACCELERATING. THIS IS A DANGEROUS CONDITION WHEN TURNING INTO TRAFFIC OR WHEN NEEDING TO QUICKLY ACCELERATE AWAY FROM A HAZARD. IT ALSO CREATES TRAFFIC BACKUPS BY DELAYING LIGHT CHANGES FOR VEHICLE BEHIND. THE VEHICLE AS IT CURRENTLY PERFORMS IS A SAFETY RISK.

THE VEHICLES AUTO START/STOP FEATURE PUTS THE DRIVER IN COMPROMISING SITUATIONS WHEN POWER IS DEMANDED FROM THE ACCELERATOR AFTER AN ENGINE POWER-DOWN. THE ENGINE DOES IGNITE TIMELY, (AS SOON AS THE BRAKE PEDAL IS RELEASED) BUT THE DELIVERY OF MOVING POWER IS DELAYED (LAG PERIOD) FOLLOWING AN AUTO "SHUT-OFF AND LEAVES THE VEHICLE IN COMPROMISING SITUATIONS WHERE NO POWER CAN BE DEMANDED FROM THE DRIVETRAIN. WHEN THIS DELAY PERIOD (LAG) HAS PASSED, AND POWER IS FINALLY TRANSFERRED TO THE WHEELS, THE VEHICLE EXPELS THE DEMANDED ENERGY FORCEFULLY, JERKING YOU FORWARD. I FIND THIS TO BE A SAFETY CONCERN PARTICULARLY FOR LEFT HAND (YIELD) TURNS WHERE ACCELERATOR RESPONSIVENESS IS CRITICAL BOTH THE PASSENGERS OF THE VEHICLE AND ONCOMING TRAFFIC. AUDI DEALERSHIP CHECKED OPEN CAMPAIGNS, RECALLS BUT "CANNOT REPLICATE" CUSTOMERS CONCERN. THEY DID HOWEVER, TRAIN ME ON HOW TO "DISENGAGE" THE AUTO START/STOP FEATURE, BUT THIS NEEDS TO BE DONE AT EVERY STARTUP. (IF THERE IS NO PROBLEM, WHY DISENGAGE IT?) AUDI EXPERIENCE CENTER (1-800-822-2834) SAYS THEY RELY ON THE JUDGMENT OF THEIR SERVICE CENTERS AND CANNOT PROVIDE FURTHER GUIDANCE. *TR