Coming off the hwy my vehicle slowed down from 55 mph to about 40 mph fairly fast thankfully no one was behind me. check engine light came on, tried pressing on the pedals but vehicle was not speeding up at all. the traction light also came up. took it to chevy dealer right away and they said it was the accelerator sensor not communicating with the system. took about a week to get my car back from the dealership.