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Pull the GM service history report to start with, then you can get the car fax report next.
The car fax history is more to get an idea of how many owners the car had, while the GM history report will tell you what has been done to the car instead.
Hence the car may have been wrecked, the owner paid out of pocket to not have it show up on either report, but if the car was a lemon with a lot of repairs under warranty, it going to show up on the GM service history report every time instead.
A total waste of money. Carfax is now a car salesman's tool.
I bought a C5 once that had a clean Carfax report that turned out to be a "factory buyback". Read that as a LEMON. I had so many problems with that car that I almost swore off Corvettes forever.