Upgrade older saved tune to new ECM OS version?

[TxDuramax]

Hello,

I purchased a 2019 Duramax LP5 from an auction. It was already unlocked and tuned (both the ECM and TCM). I saved the entire ECM and TCM configurations with VCM.

Later, I purchased a switch on the fly tune (SOTF) from MotorOps, and wrote the new tunes to the ECM via VCM Editor.


I plan to take the truck to a dyno to see the different power levels / output of each of the newer SOTF tunes, but I also want the ability to go back to the origional tune the truck came with when I purchased it. The original tune was impressive.

I attempted to write the original file back to the ECM (both with Write Entire, and Write Calibration), but I am unable to get the initial tune to load properly.

If I "write entire" from the original tune, it appears to complete, however, the truck operates in a "limp mode" complaining about emissions. If I do a "Write Calibration Only" I get the following error
"Write Calibration selected for [E41] but operating system ID's are different"

When I compare ECM OS ID's I can see they are on what looks to be significantly different versions of the OS (same physical ECM).

Original Tune File:
Hardware: E41, GM 2017+ 6.6 L Duramax
OS: 12697841

MotorOps SOTF (new ) Tune
Hardware: E41, GM 2017+ 6.6 L Duramax
OS: 24285377


I'm guessing the newer tune also updated the ECM OS, and the old tune isn't compatible with it (at least that is my theory of why I cant restore the original tune).
Is there a way to upgrade my old tune file to be compatible with the newer ECM OS?

2022-12-19 16_10_31-VCM Editor - G__My Drive___Walker-Personal_Automobiles Cars Truck_2019 Chevy.png
2022-12-19 15_55_46-VCM Editor - G__My Drive___Walker-Personal_Automobiles Cars Truck_2019 Chevy.png


Thanks in advance for the help!

Shane

[jr2185]

How did you read the tune that was on it? I'm pretty sure these are virtual read only and when you read the tune, you were probably given a stock file to work with. I'm guessing that tune is gone.

[TxDuramax]

Ugg, I sure hope not, but I bet you might be onto something. The tune was read from the VCM Editor --> Read Vehicle --> Gather Info --> Read Entire. When I write that tune, it does appear to be a "stock tune."

Is there a way to determine what shop tuned the truck originally, with the VIN number for example? Since I bought the truck from an auction, so far I have not been able to find the previous owner to ask him.

Thanks!

Shane