This warning lamp monitors the Audi hold assist function.

Audi hold assist helps the driver to keep the vehicle stationary while the engine is running, for instance on steep gradients, at traffic lights or in stop-and-go traffic. When the Audi hold assist function is on, you don't have to keep your foot on the brake to prevent the vehicle from accidentally rolling away. Once it detects that the vehicle is stopped, Audi hold assist keeps the vehicle stationary. The green symbol in the instrument cluster indicates that the function is activated. You can now take your foot off the brake pedal.

When the vehicle has been stationary for an extended period, Audi hold assist will automatically apply the parking brake. In this case, the green symbol will change to red .