The throttle and accelerator pedal is very HOT- highly sensitive, resulting in jerky lunging upon start off in 1st gear from a dead or 1 mph stop. The vehicle has been into the dealer 2 times for this issue with the same repair comments, vehicle meets all factory specs and all XT 4 react this way- well that's not safe. If that's the case, then this is a design defect which is unsafe as the accelerator pedal reacts to quickly with a non-smooth action and lunging which could cause a rear end collision. Other car evaluators have also indicated the XT6 has a jerky accelerator, just like what I am reporting. It may be the TPS -Throttle Position sensor in combination with the APS-Accelerator Position sensor. Sometimes it is so violent it throws occupants backward into the seats. Dealer says within spec. GM needs to solve this issue.

- Reno, NV, USA

Mil lamp illuminated, lost power and transmission would not shift while underway in traffic

- Kewadin , MI, USA

Car shuttering/bucking during acceleration from stop and at steady highway speed. Tachometer showed approx three hundred RPM fluctuation at steady speed. Dealer stated car has leaked coolant into transmission from trans cooler causing fialure of transmission.

- Santa Maria, CA, USA