Now that I have my thermostat situation figured out on my 2000 Bonneville SSEi, the last thing that I need to address is the "service stability system" light that comes on once every time that I drive for any length of time. I have googled the problem, and it appears that there are several things that could be causing the light to come on. Any help is appreciated, thanks!!!
here is a list of things that will cause that, I replaced many of these items on mine that were shown to be bad from a scan at the dealer
Wheel speed sensor in one or more hubs (must replace entire hub(*))
Yaw sensor #1 (replace sensor)
Yaw sensor #2 (replace sensor)
Steering wheel position sensor ( replace sensor) here is the write up on doing the steering wheels sensor Replacing the steering wheel position sensor 2000+