2006 Chevrolet HHR

2006 Chevy HHR Automatic 52000 miles

Whenever I drive on the highway after about 10 minutes the traction control light turns on. When I get off and drive on city streets the car has a heavy shift. After the engine has been off for 10-15 minutes the light will go off and the car drives normal again. When I take the car to the dealer, they say the light has to be on when they do the diagnostics, but when I drive it in, by the time they get to it the light is no longer on. Any ideas?
November 10, 2010.

Check out the related content below while we wait for the question to be answered by a professional mechanic.