I saw this on Corvetteforum. Has anyone heard about this yet or is it BS? According to this, even if you reflash back to stock, they can still detect if the ECM has been modified.

A GM bulletin will be distributed to Dealers shortly.

This post is for those who have 100% bone stock Corvettes and want clarity on the tuning issue.

GM's New Software:

GM is rolling out a new procedure that can identify when a non-GM calibration has been installed in a vehicle. The new process checks a log to see what calibrations have been added. If the calibration does not have an official GM part number it, it is instantly identified as a tune or other calibration not supported by GM. If the log contains a GM part number the process digs a little deeper to find a series of numbers buried in other modules. This confirms that the part number is not a mask for a non-GM calibration. If the calibration is found to be a NON-GM calibration, as from a tune, GM is advising dealers that the warranty repair on the powertrain will not be honored. The dealership will need to provide proof if a powertrain failure has occurred that the calibrations are GMs before any repair is performed.

Furthermore, since GM can not determine what the impact of a non-GM calibration effect will have on the entire powertrain. GM will void the remaining powertrain warranty. This means engine, trans, drive shafts and differential will no longer be covered. This process has been tested on different Corvettes and other GM vehicles including Diesel's. The process correctly identifies cars with non-GM calibrations.

This also addresses those that think re-flashing the ECU before taking it back to the dealer is not detectable…..it is.
Owners, if you have not installed a tune or engine modification, don’t do it if you value your warranty. The consequences are giving up the 5 yr 100,000 mile powertrain protection. If you have a tune already installed then be upfront if you encounter a problem.

NOTE: If anybody has had a true problem with a 100% bone stock car under normal driving conditions and needs further assistance feel free to PM me.


It goes back to the old saying; if you want to play you have to pay......or be willing to at some later date.

link: http://forums.corvetteforum.com/show....php?t=1979769