AI Damage2021 Audi Q8: common problems
Owners of the 2021 Audi Q8 filed 30 complaints with NHTSA, most often about electrical system and engine. The maker issued 1,311 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 30
- Technical service bulletins (TSB)
- 1,311
What fails most often
- 1 Electrical system 43% of all complaints
- 2 Engine 20% of all complaints
- 3 Powertrain 17% of all complaints
- 4 Fuel system 13% of all complaints
- 5 Steering 10% of all complaints
- 6 Backover prevention 10% of all complaints
- 7 Forward collision avoidance 10% of all complaints
- 8 Fuel/propulsion system 7% of all complaints
- Electrical system: 13 complaints (43% of all); manufacturer bulletins for this component: 448.
- Engine: 6 complaints (20% of all); manufacturer bulletins for this component: 56.
- Powertrain: 5 complaints (17% of all); manufacturer bulletins for this component: 23.
- Fuel system: 4 complaints (13% of all); manufacturer bulletins for this component: 8.
- Steering: 3 complaints (10% of all); manufacturer bulletins for this component: 44.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 3 L · hybrid · turbo · 6 cyl
- automatic, 8-speed
Drive: AWD
Symptoms owners describe
How many of the 30 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 13 | 0 | 448 |
| Engine | 6 | 0 | 56 |
| Powertrain | 5 | 0 | 23 |
| Fuel system | 4 | 0 | 8 |
| Steering | 3 | 0 | 44 |
| Backover prevention | 3 | 0 | 19 |
| Forward collision avoidance | 3 | 0 | 9 |
| Fuel/propulsion system | 2 | 0 | 13 |
| Lane departure | 2 | 0 | 12 |
| Service brakes | 1 | 0 | 43 |
| Exterior lighting | 1 | 0 | 26 |
| Seat belts | 1 | 0 | 10 |
| Vehicle speed control | 1 | 0 | 4 |
| Equipment | 0 | 0 | 299 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
At approximately 52,000 miles, on August 11,2026 (or earlier), my vehicle developed a coolant leak that was traced to a failed coolant shut off valve. The coolant shut-off valve failure allowed coolant to migrate into the vacuum harness, vacuum reservoir which contaminated the water pump.
Power steering fails. The last time I left the car to the dealership to have a recall serviced - it did this. I let the Audi (Fred Lavery Birmingham Michigan) know. They did not respond / did nothing. It has happens at least 10x at varying speeds (some high, med and low speed) since the day I left the dealership
I was driving my car would not accelerate on the highway and it almost caused me to get into an accident with my niece in the car. When I took the car to Audi this is what I was told my the service adviser. “Good afternoon. The technician has been looking into the vehicle and has found the cause of the issue.
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.
Audi Q8 failed water pump leading to severe loss of power and a major safety issue. I was merging on a very busy highway when I had loss of power with my children in the vehicle.
The vehicle developed a persistent ticking/knocking noise from the engine bay, and the authorized Audi dealer diagnosed the issue as requiring a full engine replacement. The vehicle is currently available for inspection upon request.
Additionally, the contact stated that the vehicle stalled while driving at various speeds. The vehicle was taken to the dealer, where it was diagnosed that the fuel pump had failed, but the vehicle was not repaired due to the cost.
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.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 1,087 of 2,102 model years in the NHTSA data (among the 48% least complained about).
On average one model year of the Q8 has 22 complaints (9 years in the data). This year has 30, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- This bulletin states that technicians are required to report to the manufacturer when a vehicle has…
This bulletin states that technicians are required to report to the manufacturer when a vehicle has flooded, and specify the height to which the vehicle has been flooded.
- This bulletin provides information when there is a warning message in the instrument cluster about…
- This bulletin provides information when there is an abnormal knocking noise from the engine compartment;…
- This bulletin provides information regarding various complaints about front or rear door locks
- This bulletin provides information regarding fault finding and repair information for electric tailgate
- This bulletin provides information about billing for a broken sunroof glass panel
- This bulletin provides information regarding driver assist systems; Audi adaptive light, Audi pre sense…
This bulletin provides information regarding driver assist systems; Audi adaptive light, Audi pre sense system fault, adaptive cruise assist inop (DTC C12D5FA).
- This bulletin provides information about vibrations and rotational steering vibrations
- This bulletin provides general information about SOS Emergency Assist
- This bulletin provides information when there are stails/marks on the sill panel trim
- This TSB describes a corrosion issue due to outside influence and the prohibition of warranty in these cases
- This bulletin provides information when the rear parking sensor sometimes does not work, rear parking…
This bulletin provides information when the rear parking sensor sometimes does not work, rear parking sensor loose, rear parking sensor fault message.
NHTSA lists 1,311 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2021 Audi Q8?
Owner complaints to NHTSA most often mention: electrical system, engine, powertrain. Total complaints: 30. The most frequent symptoms in complaint texts: warning lights, check engine (20%), loss of power / limp mode (13%), knocking, grinding or other noise (10%).
How many service bulletins (TSB) were issued for the 2021 Audi Q8?
NHTSA lists 1,311 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2021 Audi Q8 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2021 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.