Ok, on my 2003 Silverado i have the 05+ OEM fans installed, and i also have a stock 05 5.3L cal file that i was trying to reflash to my stock PCM, but it said that the cal file was from a 12589463 and my stock PCM is a 12582605, i said go ahead but after 3 times it said it couldnt do it.

So my question is, i found a guy that has a 2005 PCM that is 12589463 ser #, from a 6.0L, he wants 50 bucks for it. Will this go directly into my truck, and then i can flash it with the stock 2005 5.3L cal file?

My goal is to get the fans working like they were there from the factory, is this is the cheapest way i can go, till i get the cash to get a tune from NP.

I dont think they changed the wiring harness, but this is why im asking.

Thanks