Checksum error code $06FF with L92 PCM

[67SS509]

Tried to cal flash a modified tune into a 2014 Chevy truck with the 6.2 engine and OS #12663390. At the end of the flash got a "Script Exited with Code $06FF-Checksum Failure" . Engine would not crank or run. I then flashed the stock file back into it and it cranked and appears to be fine. Any ideas on what I need to do different or change?

[GMPX]

Any chance this ECM has had another programmer on it before?

[joecar]

I'm seeing same "Checksum Failure" on a 2013 E38 file that I sent to Paul... my customer claims he flash with GM TIS...

this happens only when flashing with V8 or V2 BBF.


Flashes with no errors when using V7.

[GMPX]

If anyone wants to post tunes I can test them here.

[67SS509]

It was a tune that was copied from the PCM when it had a handheld programmer installed, changes were made to it and I tried to flash it in. What I finally got to work was compare the tune to the stock file, just copied the changes and it worked.

[67SS509]

I will post the tune tomorrow that would not work and let you take a look at it.

If anyone wants to post tunes I can test them here.

[joecar]

I'll dig thru my emails...

[GMPX]

It was a tune that was copied from the PCM when it had a handheld programmer installed, changes were made to it and I tried to flash it in. What I finally got to work was compare the tune to the stock file, just copied the changes and it worked.

That is the problem then, they alter the data in order to disguise the CVN changing on a modified tune, unfortunately EFILive thinks there is a checksum error because of this and the flash fails. I can fix it for you when you post the tune up.

Cheers,
Ross

[Doc]

Had this exact problem today. Please help.

[GMPX]

Oh no, whoever it is they are doing it to E92's now! Your fixed file is attached.