I swapped from a 5.3 and 4l60e to a 6.0 lq4 and 4l80e but I cant find a os that matches mine????????? my os is (12580055) I looked all over and cant find any thing can anybody help???>? heres my tune below
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I swapped from a 5.3 and 4l60e to a 6.0 lq4 and 4l80e but I cant find a os that matches mine????????? my os is (12580055) I looked all over and cant find any thing can anybody help???>? heres my tune below
That's going to be a really tough one because that OS was changed in 2003 to a 12593058 OS and most likely all the 4L80e segments you'd find floating around are that.
You could maybe email support to see if they have a file or maybe someone by chance happens to have a 12580055 4L80e file to use for segment swapping.
If your 2003 5.3L Trailblazer is still using OS 12580055, then it never received the final software update from a dealership, while still under warranty.
The 2003 OS software progression is as follows:
12578128 > 12579405 > 12580055 > 12593058
The easiest option, to be able to swap in 4L80 segments, would be to have your 2003 P59 PCM updated by a GM dealer - to OS 12593058.
Then as 5FDP indicated, this newer OS was more widely used by 2003 models - giving you 4L80 segment swap options.