As a former GM dealer tech, GM has been monitoring the calibrations on the Duramax since at least '04. GM has a set of numbers that can only be read with a Tech 2, and that change predictably with any factory updates. If an aftermarket program is installed into the ECM, those numbers will change outside of the predicted increment. GM has record of what they were the last time an authorized update was flashed into the ECM. In the event of any expensive failures while under warranty, we were required to email a screenshot of those numbers to the Powertrain Quality Center for validation. If they did not match the set on file, the repair was denied and a powertrain warranty block would be put on the VIN. They have upgraded this system to include gas engines as of about '08, I got out due to no money in '09.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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