Checking troubleshooting codes Pontiac grand Am Se without a code scanner?

It cannot be done, you must have a code reader because the system is OBD2, you used to be able to do it without a code reader, but that was OBD1, OBD2 is much more complicated electronics. If you want to get it scanned, you should go to Autozone, they will code scan for free but will not clear codes. You have to pay someone with a code reader to clear the codes, disconnecting the battery doesn't work either