Reduced engine power

Ok I have a 2008 Chevy cobalt lt that I just
bought today went about 50 min from home
to get and when I went to buy it the car
sounded perfect it runned smooth when I
drive tested did not have a check engine light
so I bought it and drove it back home and
later at night I went back into my car to listen
to music while it was on for about an hour
(lost track of time ) and the car went into
reduced power engine, now the car has a
weird red push button next to the usb plug
that when I hold the gas gauge goes to
empty and the sensor lights all light up until I
release than it goes back to normal, now
before I went into my car and listen to music
(that led to the reduced engine power) I might
have pressed the button while driving. and
now that the reduced power happen I got a
check engine light and car would just rumble.
so I went online to try and look information
on that button but couldn’t find  so I
concluded that it might have been some sort
of anti theft button (in hope I didn’t make a
expensive decision in buying the car) so I
searched information on testing anti theft and
saw some tricks on there so I messed with
my car (held my key on unlock side of my
door for 15 sec as suggested) as well as
messed with the button while off, than my
steering wheel was locked while I was trying
to turn it on and it wouldn’t turn on, until I
moved my wheel all the way to the right while
I turned it on and it miracously turned on and
the reduced engine power was fixed was it
just coincidence and it had nothing to do
with it or is that what it was ?