We've identified 5 known issues that can affect the 2020–2021 Audi A6 Mk5 (C8). 3 of these are serious faults that could be expensive to repair.
The 48V mild-hybrid system can fail, leading to an "Electrical system: fault" message.
Warning messages, Total electrical failure while driving
Control or clutch faults can interrupt gear selection. Identify the gearbox code first: this entry applies to the longitudinal DL382 family, not every automatic sold under the same model name.
Gearbox warning, Delayed engagement or missing gears
SCR dosing or NOx sensor faults can trigger an emissions warning and a no-restart countdown. Adding fluid alone does not resolve every system fault.
AdBlue system fault, No-restart countdown
The dual upper (navigation/media) and lower (climate/haptics) touchscreen displays can fail to initialize, suffer touch input lag, or reboot randomly while driving.
Lower climate screen unresponsive to haptic touch, Upper display freezes on Audi logo, Reversing camera image flickers
Electrically controlled coolant regulator shut-off valves and vacuum-actuated water pump plastic housings develop weeping leaks, coating the front of the block in crusty pink residue.
Low coolant warning chime, Coolant level steadily drops over 1,000 miles, Faint sweet smell from engine bay