I just put slightly larger than stock winter tires on my Pontiac G8 GT. I'm getting error codes for traction control and brake problems. After doing alittle research I found it's due to the larger tires. Will this programmer take care of this issue, or will it only calibrate the speedo? I haven't ...

I'm looking to buy this tuner. I just want to double check something. If I have 2 GM vehicles, a 2009 Pontiac G* GT and a 2007 Tahoe, I will still need to buy an additional license correct?