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.

 

it's not cheap but an easy way to get around it would to be to buy a replacement ecu pull the stalk one and use the replacement for tuning the car.

 

There is always a way around things.
My old Grand Prix GTP had 2 computers, one spare that was flashed with updated tables etc. the other
original was stock. Just swapped them around before going to the dealers for warranty work.

 

The way I see it. If you have modded your car to a point where a tune in necessary your warranty would be voided anyway.... Cam, heads, rear gears, long tubes, etc dealer wont honor the warranty anyway

 

I was asking my buddy why he had not bought a programer for his new diesel and he told me GM has a way of knowing if the computer has been flashed. I thought he was crazy at first but did a little research and was surprised that GM had gone this far. I guess with the 5yr 100,000mi warranty's they want to make sure the work they are repairing is their mistake.

 

I was told that only applied to the newer C6 ECM. The older style (C5) did not have the CAN access system and firmware setup.