Hi @johnbutler58570
Quickest way to find out what's wrong is to get the vehicle's OBDII port scanned using an appropriate scantool, to see if any [https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm|DTC codes] (diagnostic trouble codes) have been logged.
The code(s) will tell you what the problem is.
Some major auto parts retail stores in the USA e.g. AutoZone, will do this for free apparently.