Hello Michael,
Typically PCM's are rather robust components that are not as prone to failure as sensors are. Some automotive electronic components can fail under heat stress and work fine after they have cooled down...like an ignition control module.
As you are experiencing your problem while engaging the ignition switch (which you described as sometimes hanging up) I would start your trouble shooting with the ignition switch itself.
Your vehicle also has steering column lock actuator you will have to deal with when removing the ignition switch for replacement which is rated as "easy"
Search Results for 2005 Pontiac Gand Am ignition switch
SOURCE: 1999 pontiac grand prix gt 3.8L v6 cranks wont start
Is the security light on? If you have spark and fuel, it should run. Any codes? Could be bad crank sensor or cam sensor.
SOURCE: car wont start...sometimes
Sounds like a bad starter solenoid, usually cheapest and easiest to replace the starter and solenoid as a unit. It is always best to check for power between the solenoid and the starter with a test light, if the solenoid clicks but the test light doesn't light up you have found the problem in the solenoid.
You can clean the EGR. No promise it will work. I have an idle problem on my `97 Grand Am Se. Shop told me I could clean it and it might solve my problem.
Just remove the EGR with the 2 bolts from the top of the manifold behind the throttle body if you have a 3.4 v6 like I do. Then leave it upside down with throttle body cleaner in it. Fill the EGR level with cleaner and let it soak for at least 30 min or more. Then reinstall.
This will remove any carbon on the inside which plugs the needle from pushing out at highway speeds. Hope this helps. If the problem returns in a week or so then replace with new EGR. New EGR is about $100-200! Cleaning seems to have helped my car did that about 3 weeks ago.
If you have a service engine light on turn the key to the run position on the ignition, pull the fuse to the ECM (batt) and disconnect the wire harness to the EGR. Reinstall it after a 1 min, That will clear all the codes in the ECM and reset everything.
Once you place the ECM fuse back in, start the car. It may stall but let it, DO NOT TOUCH ANY THING. The ECM need to relearn the EGR and engine from all it's sensors like the first time it was started. Just start it up again and it should be like the day it came off the assembly line and will relearn everything.
Good luck and just drive it like you always. If you decide to change the EGR valve, you still need to clear the ECM as mentioned above for the ECM to relearn the new EGR valve. Hope this helps and keep me posted.
SOURCE: 2005 Pontiac Vibe suddenly won't start.
nutral safty switch try moving the shifter from P ... to N....P....N....P.....N
SOURCE: 97 Pontiac GTP will not always start, turn
Yes,..
From the sounds of it check whats called your vehicles drive gear linkage. It's what tells the car it's in gears of neutral, drive, reverse etc,..
When the linkage isn't set proper the ignition sequence doesn't know if the car is really in park, neutral, drive or reverse and won't start it via that minor adjustment.
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