Car won't go over 80mph.. Needing some help!!

[Allan_OC]

As to the how: those are definitely coding level questions.
In a nutshell when the tuning device experiences an interruption during (uploading, flashing) it will corrupt the body control models. Can happen with any delivery device or tuner file.
Always ensure your tuning device has the latest updates and is in WiFi range with strong signal (when applicable) to avoid errors.

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[BlkMach10510]

As to the how: those are definitely coding level questions.
In a nutshell when the tuning device experiences an interruption during (uploading, flashing) it will corrupt the body control models. Can happen with any delivery device or tuner file.
Always ensure your tuning device has the latest updates and is in WiFi range with strong signal (when applicable) to avoid errors.

And your car battery plugged into a battery tender/charger when uploading tune.