I was driving the car and suddenly trying to stop it (of course I pressed the brake). While the car was moving 5 KM per hour, I accidentally shift gear from D(drive) to P(parking) and hard a 'gar' 'gar' sound twice. It is auto transmission car. After that I noticed when I starts my car and move gear from P to D then the car doesn't move automatically, I have to press the gas in order to move it. But before it was not like that; the car would move once I put the D transmission. Other than that everything works really well. Just wondering how can I fix it? Any response would really be appreciated. Thank you.
The transmission is a Volkswagen DSG 7-speed.