What does the tcs light and button mean on a 1999 Pontiac Montana?

Answer 1

29s here the TCS button (traction control system) is for you to enable or disable the computer controlled slip-differental or simply put the thing that senses if one of the drive wheels are spinning faster than the other(usually do to the other wheel slipping). the system when engauged will slow the other wheel or wheels down to match the slow so that you dont get an sliding affect (most noticable in snow and ice). if the light is on and you cant turn it off by pressing the button it usually means that your vehicle sensed a problem somewhere in that system during its pre-ignition check and it will automatically disable it to prevent a malfunction. as for possible causes pherhaps a speed sensor malfunction or internal trans problem a diagnostic would be ness to determine or you could try reseting your cars memory by removing your battery cables for a few minutes. beware some cars have a self locking radio that will require a code to unlock.