Here is the deal I have a tune from allen nelson on my 02 scsb, I Just bought EFIlive. I to start working with the PCM but it is locked. I can log alll day long I just cant back up the file or make changes. I have a stock pcm for a 01 2500 hd with 6.0 and 4l80, and I also have a 02 5.3 4l60 pcm. The truck has a LQ9 with heads and cam, and a 4l80 with a kit and verter. wHAT should I do to start working with the truck swap pcms? Which one? This tunning thing is new to me but I think I will pick it up just fine.

 

A full write "Should" work, though I'm not 100% with efi... Another option would be to buy another 02 PCM

 

I have a 5.3 4l60 stock pcm

 

you have to take it to the deal to have it reflashed with a tech 2 only way, or send it back to nelson to unlock it and set it back to stock.

 

I ran into the same prob, but I got it fixed. Allen is a great guy, just talk to him about it.

 

All I did was have Allen send me an unlocked pcm. Still had his tune on it.

 

I will email allen and see what he can do

 

New pcm or have it unlocked by your original tuner are the only ways.

Tech2 nor a write entire will be able to unlock a pcm.

 

hrmm I all ways thought the dealer could flash it back to stock, thanks for the answer foff