I applied, and then I had a 1 long interview with 2 people, behavioral questions and one technical question. Interview was about 2 hours. First they went over what they do, a presentation of what GM does then they asked me behavorial questions and finally a small technical question. Got the offer the next day.

interview was behavioral based. 6 questions total with two questions in the start which were to talk about youself and why you want to work for GM. It was a two hour time limit and I took an hour and 30min.