OS swap on 0411 pcm, HP Tuners
 

I am having problems with a 4l80e trans segment swap on my turbo project.
The PCM I am using for it has a 12202088 OS that has been changed to a 3 bar speed density. I have only found two compatible 4l80e tunes in 2 weeks of searching. Both are producing poor results.

I would like to use the more common 12212156 OS. I have that in another vehicle, and it seems to control the 4l80e correctly.

Can I swap OS? Will it require a new license?

You can change the OS but you will have to use more credits unless you have unlimited for 2002.

gotcha. thanks for the info.

on a hunch I swapped my 12202088 pcm into my daily with the 12212156 PCM
c&p'd over all the engine data from my daily and it controls the 4l80e just fine.

Which leads me to believe I have a hardware or wiring issue in the turbo truck.

I still get a really weird result when I swap the trans segment, it puts every cell in my main VE to 552. easy fix, but rather odd.

What year is it and what Pcm?

2001, 0411

Ya I'd use the 12212156 os and segment swap from a 02 express van the Trans segment stuff then upgrade to a 3 bar. That's what I did on my firebird.