[boomer]

If it were mine, I would consider adding electrical grade dielectric grease liberally on the female end of the PCM and blue BCM connectors. Work it in by gently re-seating the connectors. Lock the ones that can be locked, and zip-tie the ones that are broken (extend it over the back of the ECU if need be). The dielectric grease will reduce corrosion and improve metal to metal contact. I mention the BCM as this was a recall item for weird electrical issues and it also fixed my transmission limp mode.

 

[boomer]

If you are not sure how resent the codes are, I would clear them and note what comes back.

You can also take a look at the service manual information for the codes to see if they offer any clues
P2135 — 2010 Pontiac G6 L4-2.4L Service Manual | Operation CHARM
P0014 — 2010 Pontiac G6 L4-2.4L Service Manual | Operation CHARM

 

[boomer]

If you scan right away it should be clear unless there is a hard or continuous fault. I expect you will need to drive for a bit, see the problem and then get the codes.

 

[boomer]

I believe you mentioning replacing the throttle position sensor. As that is a code you are throwing you might want to consider swapping the original back in to see if you get the same problem. You could also try some electrical contact cleaner on the throttle position sensor connector and checking for any damaged or broken wires.

Hope you can get it working reliably again

 

[boomer]

The engine control module (ECM) or powertrain control module (PCM) are usually interchangeable terms to my understanding as well. On my 3.5 the PCM/ECM is located in front of the battery box and is what you were pressing the cables back onto because the locking mechanism is broken. The Body Control Module (BCM) is in the passenger foot well behind the cover on the left of the passengers feet.

If you have one in your area you could also consider trying to replace the broken PCM connector shell with one from a pick a part or car breakers. Best of luck getting it running again.

 

[boomer]

Nothing else from me at the moment. Hopefully something already suggested or included in the service manual links will prove fruitful