Got a new BCM for my chevy impala?

ok so my cars turn signals had been messing up for a while like they wouldn't come on sometimes or they would come on but blink really fast and other times they were fine then my car worked one day and the next it didn't. so i had a mechanic come out and he said the BCM was bad and i paid to have it fixed. but my question is this i had a dummy light for check engine and check oil and now the light behind my gas Gauge does not come on, is this controlled by the BCM? should those lights have reset and be correct because i give my car regular oil changes and everything else seems to be fine with my car.