Pcm Unlocking

[joecar]

quick question:
If you are going to use a new EFILive tune or custom OS... wouldn't it be easier to reinstall new software over the locked program? Or, am I misunderstanding and it is the PCM's access that is locked?
On the few "locked mail order tunned" PCM's that I have redone I have had no problem with reinstalling a current version of GM software and starting over with 'clean' un-piddled with software.

Maggie, I was wrong, looks like access to the PCM is locked.

Joe

[Maggie]

Hmm, well I had a 'locked' pcm from an exchange laying around so I thought I would give it a go...I didn't have any problem with the install of new 'Dealer software'. The PCM had a re-write from Z-industries in it. I couldn't get into the PCM with either Edit or EFiLive. Teck II reported a soft ware error. I replaced the software & all seems to be good.... ??? I suppose that the PCM may have not been actually locked but the tables had been moved or re-aranged and could not be read by EFI Flash scan or Edit?