2003 Grand Am Trac Off light on

lights
pontiac

#1

2003 Pontiac grand am “Trac Off” light on in some when car was stoped. Light will auto turn off (at the most of time) when drive 30~60 sec later. From owner manual, it said properly is engine problem.

But, if it is speed sensor problem, how to determine which side of sensor need to be checked? Thanks,