I just got an SMG warning light. The car seems to go into a limp mode where the setting is set to S1 or S2. Is that supposed to happen?

The warning light just came on unexpectedly. Maybe just needs to be reset - I hope. I'll take it my garage soon to find out what's up.

Any idea of what could have happened? Car was running fine until the light came on.

Haven't posted in a while - hope someone is out there :)