Pontiac Repair: 3 warning lights together, pontiac grand prix, vent valve

Question
I have a 2005 Pontiac Grand Prix and I keep getting the same 3 warning lights the Traction Control, Variable Steering System and ABS Control system lights keep coming on. I have also been getting a Gas Cap warning but not at the same time the other 3 come on???? Hopefully you can help me any suggestions would be great!!!! Thank you,

Answer
Hi steve:
with out knowing what the codes are I can't really help you out. Ther are literally 10's of trobles codes that can set on these newer cars. stop by one of the big box auto parts stores and have them scan the car for codes they do it for free.. once you know whta they are let me know and I can hopefully guide you in the right direction. the Gas cap code more then likley is cause by either a Emissions canister vent valve or a gas cap it's self. good luck :)