I appreciate ur responses I've talk with 3 different dealership. One told me it'* possible but they didn't have the equipment anymore. Second one said maybe they could maybe not. I'd have to pay $150 and roll the dice.. Well then I go to the dealership right down from where the car was parked and they told me absolutely can't be done. They cannot rewrite the vin. But I Google it and watch videos of people doing it.. anyways. I'm pretty sure it'* the pcm. After a week of investigation I cut the ye/bl wire about 3in away from the pcm. And hook a test light from positive side of injector and that wire to eliminate the chance off a bad spot in the harness and was still constantly grounded. ye/bl is grounded even when key is not on. Injector is shut off only because with key off no + power is to it. Is there something that tells the Pcm to tell the injector to fire that could be messed up? I wouldnt think so because with key off it should lose ground. could it be a programming issue that reprogramming the Pcm would fix?

I can't believe I haven't asked yet: This car has the 3.4, right?

Others have messed with this more than I, but if it were in my driveway I'd ask: Did you test same wire towards another injector and see if it has the same behavior?

I can't imagine that a PCM would toodle along all these years and then quite suddenly encounter an event that causes it to only have this specific issue. It'* possible but hard to imagine. They usually have had some physical damage, have much larger symptoms, or just plain fail. So, my answers to these questions:

Like the crankshaft position sensor etc.? If this were the case it would affect all cylinders, not just the one.

I doubt this. If this were the case, the situation would be such that the PCM all-of-a-sudden changed its mind on what it was supposed to do, and only on that one injector. Not the other injectors and not the spark plugs and not anything else. If it did this then I'd expect we'd have seen it happen from time to time on some of the Captivas, Equinoxes, Torrents, Vues, XL7s, Terrains, and 9-4Xs out there. Then there'd also be the question of "If it is reprogrammed to correct this issue, what stops it from deprogramming itself back to having the issue again?" It seems quite a stretch.

I do see https://www.rockauto.com/en/moreinfo...434321&jsn=388 at RockAuto, so it must be possible to replace, just likely with a dealer reprogramming it to match your VIN and vehicle.

Have you disconnected the harness to the PCM, and checked to see if the wire to the injector is still grounded?

Good catch. I hadn't thought of that.