My trackion light came on and said to service traction bar

Hello, "traction bar" - no, it's more like the traction control system. This will require a diagnostic tool that is capable to of testing "C" Chassis module related codes. If the light does not come back, however, I'd drive normally. If the problem reoccurs, then you'll need to perform testing to determine the cause of concern. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops