Editing and writing EFIL COS file w/TPRT & PCMH

They go by many names, P01, P59, VPW, '0411 etc . Circa 1999 to 2006. All VPW OBD2 PCMs.
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Editing and writing EFIL COS file w/TPRT & PCMH

Postby bbpanel » Fri May 31, 2019 3:53 am

I posted this on the TPRT Forum w/o any responses so I'll see if perhaps there is a different audience here.

I have an EFILive COS "tun" file (P01 PCM). I had it exported to a "bin" format (using EFIL). I was able to read the Calibration Segment Info using TPRT5 and the OS = 1270003. This corresponds to an EFILive COS for a GM OS = 12208322 (2001 P01). Using an XDF corresponding to that GM OS I was able to read quite a bit about the bin file and everything I found agrees with what I know about the tune.

Even though the XDF is not showing any of the EFILive COS tables/parameters I am able to view those portions of the bin that are OEM tables/parameters, etc. – at least I assume that is what I’m seeing. Can anyone verify that?

So, my question is if I can view an oem table/parameter can I edit any of these tables/parameters and not corrupt the bin file? And if I can do that, can I use PCMHammer to write the edited EFIL bin file to my PCM? Does PCMHammer care that it is an EFIL file?

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby Holden202T » Fri May 31, 2019 11:44 am

if the table is correctly showing in tunerpro i can see why it wouldn't work.

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby bbpanel » Fri May 31, 2019 1:33 pm

Holden202T wrote:if the table is correctly showing in tunerpro i can see why it wouldn't work.

You lost me with that - could you elaborate?

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby Tre-Cool » Fri May 31, 2019 4:42 pm

he forgot the the 't

all the standard calibration data is still in the same spot as normal. they just added tables and changed background code for the COS

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby bbpanel » Mon Jun 03, 2019 2:00 pm

Ok, that's encouraging - what are your thoughts on this?
.. will PCMHammer write the EFIL COS bin file to my PCM? Complete, including the COS parameters/tables, etc? Does PCMHammer care that it is an EFIL COS file?

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby NSFW » Fri Jun 28, 2019 4:50 pm

The app itself doesn't know what's in the files. But if the seed/key algorithm is different from GM's, PCM Hammer will not be able to unlock the PCM.

That said, the developers of the app really wish people wouldn't use it to poach from EFI Live and HP Tuners.
If you want a custom operating system, you should buy one from EFI Live or HP Tuners. Don't use our software to steal theirs.

If you have the skills to contribute to an open source custom operating system, we'd love to have your help with that.
Please don't PM me with questions about tuning or flashing - start a thread instead. Thanks!

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby allenmathew » Mon Jul 08, 2019 8:18 pm

very well explained.

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Re: Editing and writing EFIL COS file w/TPRT & PCMH

Postby Tre-Cool » Tue Jul 09, 2019 11:34 am

NSFW wrote:The app itself doesn't know what's in the files. But if the seed/key algorithm is different from GM's, PCM Hammer will not be able to unlock the PCM.

That said, the developers of the app really wish people wouldn't use it to poach from EFI Live and HP Tuners.
If you want a custom operating system, you should buy one from EFI Live or HP Tuners. Don't use our software to steal theirs.

If you have the skills to contribute to an open source custom operating system, we'd love to have your help with that.


I have workshop licensing for ls1 stuff & have started to migrate most of my big hp stuff to haltech ecu's, but I would be happy to help test & throw idea's around since I have no coding skills.

In saying that, I'm a realist in that the efilive custom os code is pretty bloody good, so you'd need to imitate it's features as a good start.

With the advent of turbo's being able to do some form of boost per gear or rpm control would be awesome.

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