should my 2014 GMC Terrian need a Cadillac converter replaced already

What kind of diagnostic steps have been taken to determine the catalytic converter has failed? Catalytic converters are not moving parts -- they do not degrade by themselves. They fail as a result of engine performance issues, most typically - too much unburned fuel going into the exhaust due to poor performance. Therefore, there is no time or mileage expectation for the catalytic converters of a vehicle. Theoretically if all works well, they should outlive the vehicle. I would ask questions and look back at the running condition of the engine prior to the "guess" that your catalytic converters need replaced. What testing has been done? www.repairpal.com/repair-shops