2025 Audi Q8 Problems: 2 Issues Every Owner Should Know
2025 model year · 1,050+ owner reports · Updated April 2026
According to Au7o's analysis of 1,050+ owner reports, the 2025 Audi Q8 has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is 48V Mild Hybrid System Faults and Start-Stop Issues with 550 owner reports. Across all issues, repair costs range from $0 to $3,500. DIY maintenance guides at au7o.io.
All 2 Known Issues
On the 2019-2025 Audi Q8 3.0T MHEV, the Q8 48V mild hybrid system experiences faults with the belt-driven starter-generator (BSG) and 48V lithium-ion battery. The system manages engine start-stop, coasting, and energy recuperation. Faults disable start-stop and coasting functions, and can cause rough engine restarts that feel like the car is stalling at traffic lights. Cold weather significantly increases fault frequency.
Common Symptoms
- Start-stop system disabled warning
- Rough/jarring engine restart from auto-stop
- 48V system malfunction message
- Loss of coasting function
- Reduced fuel economy
- Engine shudders when restarting
- Multiple electrical warning messages on cold mornings
- Battery management system fault
How to Fix
Dealer software update is the first step, as Audi has released multiple calibration improvements. If software does not resolve, diagnosis will determine if the 48V battery, BSG, or DC-DC converter needs replacement. The 48V battery is under the luggage compartment floor. Most issues are resolved with software updates.
What Owners Are Using
Parts and tips from 550+ owners who fixed this issue
- TipRequest the latest 48V software calibration at every dealer visit. Audi has released 3+ updates. Most 48V faults are software-related and resolved without hardware replacement.
- NoteThe 48V battery is NOT the same as the 12V battery. Do not attempt to service it yourself. The 48V system can deliver dangerous current and requires dealer or qualified technician service.
- UpgradeHigh-performance AGM battery with excellent cold cranking amps and deep cycle capability (Optima RedTop AGM Battery)
- UpgradeOEM-quality replacement battery with reliable performance (ACDelco Professional AGM Battery)
- UpgradeAutomatic battery maintainer to prevent parasitic drain issues during storage (Battery Tender Junior 12V Battery Charger Maintainer)
- UpgradeOEM-quality starter motor for reliable engine cranking (Denso Starter Motor)
- UpgradeRemanufactured starter with gear reduction for improved cranking performance (Remy Remanufactured Starter Motor)
On the 2019-2025 Audi Q8 3.0T MHEV, the Q8 MIB3 infotainment system with dual haptic touchscreens experiences freezing, black screens, and phantom touch inputs. The lower climate screen is particularly prone to glitches, sometimes adjusting climate settings on its own or becoming completely unresponsive. The system can lock up requiring a hard reset, leaving the driver without climate, navigation, and vehicle settings temporarily.
Common Symptoms
- Upper or lower screen goes black
- Touch inputs not registering
- Climate screen changes settings on its own
- System freezes and requires hard reset
- Apple CarPlay/Android Auto disconnects
- Navigation crashes mid-route
- Backup camera shows black screen
- Screens take 30+ seconds to boot on startup
How to Fix
Hard reset by holding the volume knob for 15+ seconds. Ensure the latest MMI software is installed at the dealer. Persistent issues may require MIB3 module replacement under warranty. Some owners report that disabling Wi-Fi hotspot and background app refresh reduces freezing frequency.
What Owners Are Using
Parts and tips from 500+ owners who fixed this issue
- TipHard reset: hold the volume/power knob for 15+ seconds until both screens go dark and Audi logo appears. Resolves most temporary freezes. Try this before visiting the dealer.
- TipTurn off the in-car Wi-Fi hotspot if not using it (Settings > Wi-Fi). Some owners report this reduces background processing load and improves MIB3 stability.
- UpgradeProfessional OBD-II diagnostic scanner for reading infotainment and body module codes (BlueDriver Bluetooth Pro OBD2 Scan Tool)
- UpgradeAutomotive relay replacement set for common relay failures (Bosch Automotive Relay 5-Pin 12V)
- UpgradeDigital multimeter for diagnosing fuse, relay, and module electrical faults (Innova Digital Multimeter)