Audi Q8 e-tron 50 quattro GE

The most serious known issue carried over from the earlier e-tron. The rotor shaft seal separating the coolant circuit from the motor's electrical components can fail, allowing coolant to seep into the motor housing and destroy the windings. Once coolant enters the motor, the entire unit must be replaced as the seal cannot be serviced independently. On pre-facelift e-trons, this affected approximately 2% of cars, particularly 2019-2021 builds. The Q8 e-tron benefits from later production and potentially improved seal materials, with fewer reported cases so far, though the fundamental design is the same. Audi extended the motor warranty to 10 years / 190,000 km in the USA, but this extension does not apply to European-market vehicles, which retain only the standard 2-year warranty. During inspection, check the small plastic catch reservoir next to each motor: it should be empty. Any coolant present indicates an active leak.

All Q8 e-tron models come with adaptive air suspension as standard. The compressor can fail, causing the car to sag on all corners with a suspension malfunction warning. Individual air struts can also develop leaks, particularly after extended parking in cold or damp conditions, causing one corner to sag overnight. The Q8 e-tron received an updated compressor design and revised control unit software (August 2023) compared to pre-July 2019 e-tron builds, which reduces but does not eliminate the risk. Compressor replacement costs approximately €950-1,200, while a single air strut runs €1,200-1,800. The system shares components with the Audi Q7 and Volkswagen Touareg, so parts availability is good.

A common issue across the e-tron range and many other EVs. The 12V battery powers all ancillary systems and can drain within 7-14 days if the car is not driven or plugged in. The DC-DC converter that charges the 12V from the HV battery only operates when the car is in Ready mode or during HV charging. The myAudi app regularly polling the vehicle accelerates drain. When the 12V dies, the car becomes completely unresponsive despite a fully charged main battery, often requiring towing or a portable booster. Replacement costs €200-350 plus potential towing charges. Keeping the car plugged in or using a trickle charger during extended parking prevents the issue. Audi released software updates on later production cars to reduce standby drain, and the Q8 e-tron benefits from these, but the fundamental issue remains if the car sits for more than two weeks.

Owners report intermittent MMI freezing, delayed touchscreen responsiveness, Bluetooth connectivity drops, and complete system crashes requiring reboots. The system can display loading messages that persist indefinitely. A quick fix is holding the power/volume knob until both screens turn off. For persistent issues, locking the car and walking away with all keys for one hour forces a full system reboot. Audi has released multiple software updates, including the 3812 update which improved CarPlay stability. Some dealers report that large updates can take a full day, and occasionally require replacement of the MMI control unit (€800-1,500). The Q8 e-tron received software stability improvements over the earlier e-tron, but reports persist on 2023-2024 builds. Ensuring all updates are applied before purchase is important.

Some Q8 e-tron owners report the car repeatedly failing to start DC fast charging sessions at public stations. The car attempts to handshake with the charger but times out before energy flows. This is often software-related rather than a hardware defect: Plug and Charge configuration issues, outdated vehicle software, or specific charger incompatibilities are common causes. Trying a different charger brand, disabling Plug and Charge, or using an RFID card instead of the app often resolves the issue. In rare cases, the charge port lock actuator or onboard charger requires replacement (€400-800). AC home charging typically works without issues. Software updates have improved charger compatibility on later builds.

The Q8 e-tron weighs approximately 2,520 kg, and despite regenerative braking, some owners report needing brake pad and rotor replacements earlier than expected, with vibration or pulsing pedal returning even after replacement. The blended braking system varies the mix of regenerative and friction braking depending on battery temperature and state of charge, which can increase friction brake use in cold weather or when the battery is nearly full. This is particularly noticeable on cars driven primarily in stop-start urban traffic without adjusting the regenerative braking intensity. A full brake job (pads and discs, front and rear) runs €800-1,400 at an Audi dealer, though some of this falls under normal wear. The issue is partly addressed by keeping regenerative braking at maximum and avoiding unnecessary brake pedal use.