I Have had my g6 gtp for less than six (6) months now. I had been experiencing the issue of hard shifting and my TC (traction control) light coming on every so often. I had no idea how to fix this or what it is. It's not constant, once my TC light comes on I know that my car will then shift hard and once it starts to shift hard the check engine light will come on. When I had it read the code that came up was P0011. If you have any help or suggestions please anything would help right now.
2006 Pontiac G6 GTP 3.9L
2006 Pontiac G6 GTP 3.9L