There are a few ways to "reset" the PCM in a 1997 Grand Am:
* Disconnect the battery: This is the simplest method. Disconnect the negative (-) battery terminal for at least 30 minutes (some suggest longer, up to an hour). This will drain the capacitor in the PCM, clearing its memory. Reconnect the terminal and try starting the car. Important: Before disconnecting the battery, make sure you have any important radio codes or other settings written down, as you may lose them.
* Manually clear the trouble codes (more advanced): This requires a scan tool (OBD-II reader) that can communicate with the PCM. The procedure will vary depending on the scan tool, but generally involves connecting the tool, retrieving the trouble codes, and then using the tool's functionality to clear them.
Important Considerations:
* If the car doesn't start at all: Disconnecting the battery is a good first step to try, but if the car still doesn't start after that, there's likely a more serious mechanical or electrical problem that needs professional diagnosis. A dead battery, faulty starter, alternator issues, or other problems could be the culprit.
* Check the basics: Before resorting to "resetting" the computer, ensure simple things are in order: fuel in the tank, sufficient battery charge (check voltage), and that the car is in park (automatic) or neutral (manual).
If disconnecting the battery doesn't resolve the starting issue, you should take the car to a mechanic for proper diagnosis. Simply "resetting" the computer won't fix a broken part or a wiring fault.
