Sometimes the GM Customer Svc account here on the forums can help escalate a situation. They managed to get my car towed for free from the Wisconsin Dells down to the west Chicago suburbs where I live after it left me stranded two months after I bought it. The challenge in your situation is that they have to schedule an engineer to look at the car, which can be difficult because there aren't very many Voltec-trained engineers compared to all the other GM service technicians.As of tonight (close of business), still waiting on engineering to advise dealership. I don't know if it helped or not, but I also called into GM, as my less than 3 month old car has now been in the shop for 9 days without resolution. Any other recommendations for escalation?