The following is from GM Tech-Link advising the any modification to vehicle computer may result in warrantee denial and instructing GM Mechanics to scan for any computer control modification.

Origian Tech-Link advisary follows....

Al Engel, Save the Wave!

Identifying Aftermarket Calibrations before Warranty Repairs
February 5, 2015
When alterations to GM engine or transmission control module calibrations are made by owners, it may subject powertrain and driveline components (the engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by GM. These unknown stresses have the potential to alter reliability, durability and emissions performance. GM is identifying an increasing number of engine, transmission and catalytic converter part failures due to non-GM aftermarket calibrations.
As a result, GM has adopted a policy that prevents any unauthorized warranty transaction submissions to any remaining warranty coverage to the powertrain and driveline components whenever the presence of a non-GM calibration is confirmed, even if the non-GM control module calibration is subsequently removed.
TIP: GM requires retrieving the calibration information and performing the calibration verification procedure whenever a hard part failure may have occurred on internal engine components before disassembly, repair or replacement of an engine assembly under warranty. It is also strongly recommended that the calibration verification procedure be performed whenever diagnostics indicate that transmission, transfer case, rear axle or catalytic converter replacement is needed.
If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty may be blocked and notated in Global Warranty Management (GWM) and the dealership will be notified. This block prevents any unauthorized warranty claim submission.

 

Sounds straight forward to me. You tune, you lose it.

I also have an issue of tune it, break it, un-tune it then go to dealer but that's just me.

Elmer

 

Wow! I think we have an answer to the tune/warranty question if this is a directive from GM (and not just a recommendation).

 

I don't think it was ever a question. The major question was whether Diablo tunes are able to be detected, which they supposedly aren't.

 

Thats all well and good, but GM can't over rule a law, and law states it has to be fixed if mod didn't cause the failure. Now the problem is how long will it take to get it fixed while fighting it....

 

The technology is there to tell them you've modified the programming or been on a race track through on-star if they use it that way. Trouble codes can be accessed for you and eventually fixes can be downloaded to cars so a visit to dealer will not be necessary to update in the future. They scan your home computer for updates and install appropriate fixes all the time, wont be much different!

 

Yep, simply unethical. Do what you know is not authorized, suspect some damage has occurred, remove the source of the problem and ask the manufacturer to fix it for you.

A few years back there were a number of cases where unethical sleazeballs would put a somewhat bolt on nitrous kit on a rental car, completely abuse the car at the drag strips, remove it and melted rubber from the wheel wells and then turn the car in, smiling all the while. Creeps. Don

 

This isn't news, back with the C6 there were similar memos, probably before that even.

It was easier with the C6, shorter powertrain warrantee, I only had 36K to wait. Well waited till 30k for tune, long tubes, etc. I figured it was close enough.

 

Somewhere around the middle of the C6 run (maybe '09 or so?) there were tech directives similar to the above. I guess this one is just reminding dealers and technicians to look for, and check computers before claims are made on C7s as well.

I'm not sure why this poster only had a 36K powertrain warranty tho, since the original powertrain warranty was, and still is 5/100K I believe.

 

2005 C6 had 36 month warranty.

 

And when Hertz began renting Shelby GT 350s (~66?) Hertz discovered some customers had removed the 289 HO, replacing it w/ a regular 289.

 

It's the grey area that will require civil court probably. They won't take the claim and blame the failure to tune. You will then have to get your own lawyer(s) and own mechanic(s) to prove it was indeed something else that made that part break.

that is SO much $$$ (and if you can prove it), you might as well spend the money on the new part lol.

Unless you have some SERIOUS cash and want to make a point, I don't think you'll win this one

 

Ditto.. I think he was making a reference to the Magnuson–Moss act. This is Magnuson–Moss act is meaningless when it comes to mods. Even if it wasn't irrelevant, if GM denies the warranty, good luck fighting it. I'd consider myself pro mods, but If you mod be prepared to eat your warranty.

Also I still have hard time believing that the Diablo leaves no trace after you put the stock tune back in. Maybe it restores the checksum and any counters, but I'd bet there is some booby trap in the ecm that we don't know about. Have any Diablo users tested this with a significant warranty claim, like say... blown motor?

 

Right. Forgot about the '05 difference.

 

I agree you should have to PAY to Play, the average owner shouldn't be looked at side-ways because others abuse there warranty. I had enough of that with Dodge.

 

It's always a question. The manufacturer can't just nullify a warranty at will. There has to be proof that some alteration directly interfered with the affected part. GM's statement still doesn't mean they have the right to reject the claim, but it does show their intent to fight it.

 

Again, such a grey area.

you get a tune. 3 months later your airbox cracks or exhaust manifold screw falls out causing a leak. If GM denied your warranty because they determine you have a tune, you might win with the right attorney. then compensatory damages and etc can come into play.

if your engine drops a valve because of a factory related issue during build, they will blame your tune, and good luck trying to prove that the tune DIDN't cause it. you will have to have master mechanics testify a tune can't cause a valve to drop. (and there is a possibility that it can if it's a bad tune from high revs etc)