Are there fault code numbers for a 1996 Chev

some pre 1994 cars did that ur car is an obd ll system 1994 to present have ur car scanned some auto stores such as auto zone/ advanced auto scan for free the trouble code will give u a start point

Some local Parts Stores will "pull" the code for free. If not you either pay someone, or buy the tools & books to do it yourself. If you choose to do it yourself then you should buy a $25 Repair Manual at the locals Parts Store or go to the Dealer for alot more, & read about the repairs before you buy or do anything else.