Just had to ask if anybody running a spare tuned ecm that has engine trouble and switched back to stock ecm and exhaust has been denied warranty from gm ,lots of talk but i dont think i have every read about it in a thread

I doubt many people have significant powertrain issues requiring warranty service. Of those, a tiny percent have 2 ecm's and exhaust. Of those, I doubt any have switched back to stock exhaust and ecm for service.

So no, I don't think so.

Its been talked about I have not heard of anyone switching yet?It was discussed that if this was done most shops could determine it was BS because the numbers would not click with the miles and many other pieces of data?

There are differing opinions on this site. Plenty of people claim to know a way to make tuning "invisible", or claim they can beat the system. But others claim, that no matter how you do it, a good attentive GM tech or warranty guy, will be able to tell.

For me, (and me only) it is too risky. I would love to do a EGR and DPF delete, and run a mild tune, but it's gonna have to wait until the warranty is gone. I have nothing against people that want to tune, but it frosts my a$$ to hear about these people complaining about denied warranty claims or anticipating denied claims because of what they did to their trucks.

I can totally understand where GM is coming from. These trucks are built to certain specs, in order to last 100,000 miles. GM will stand behind their trucks that were built by them, to their specs. But if you change the specs, add horsepower and torque, change fuel delivery, change suspension angles, etc, there is no way they would want to stand behind the engineering know how of some knucklehead with a computer or a wrench. I'm just saying....

If you wanna play, be prepared to pay.

Do some searching there are two cases that I can recall. One was a second owner that the previous had a tuner and removed it.

I have been wondering the same thing if I will have issues getting NON powertrain warranty work done after removing DPF.
I have everything sitting in my garage now and looking to install it soon.
I can't imagine that I will have an issue as they can't really refuse non related items.
I have a rattle in my back seat that I need to get the dealer to look at again.
I can't see my self realistically pulling the tuner out and putting on the stock exhaust to get my seat looked at but just wondering if anyone can attest to this kind of stuff really getting denied.

Some trucks with tuners and deletes have been flagged as warranty void in the gm system. GM has been pretty clear about this. As to weather it is powertrain only - don't know that. Since a warranty is like insurance where certain conditions need to be met to limit losses of the insurer (GM) they have "adjusters" (area reps) who can and do deny warranty based on their belief and any data collected (ie regens and tcm torque numbers are not normal/correct). Even if a dealer wants to warranty a major repair they often (not always) need approval from these gm reps to do the work and that can involve a ecm/tcm snap shot and physical inspection of the truck. Remember this cuts both ways - GM has often done goodwill repairs out of warranty to stock, dealer maintained trucks.

Any major Power train repair (Injector pump,head gaskets,Injectors,Transmission,Rear end,Etc anything involving a big repair cost)the Dealer is required to take a Snapshot first than submit it for approval before preforming any repairs otherwise they may be declined the warranty claim repair costs,it is cut and dried.
Something like a seal leaking would not be a issue as The dealer does not even have to ask for approval.
On the other hand something like a oil pan gasket leak which is a expensive repair the warranty rep could ask for a snap shot it just depends as each case is different and depending on his/her mood.
If a snap shot is done and GM determines that the calibration is not OEM than they will automatically put a warranty block on that particular vehicle and no other warranty work will be paid for by Generous Motors whatever the case or reason is for that same vehicle,once a warranty block is imputed on the Global network it will not be removed.
It would be at that point for the customer fight it out with the General.

CC:sfa:

So I am guessing that nobody is having issues taking their truck to the dealer with the tuner and DPF delete to get non powtrain warranty work done as long as they have no reason to go into the ecm? Also I guess that the dealer could be mean and just because your gauges are on the dash could go looking for a non gm tune and put your a flag on your vehicle in the GM system?
Has anyone acually been denied by the dealer for these type of repairs or had a dealer do anything like this (flag your vehicle even though it is in for something unrealted to the powertrain)?
Guess I will have to go talk to service manager to really see.

I haven't heard of denial for a swapped ECM, but there are a few on here with Tuned stock ECM's that have been denied. Does swapping the ECM change what the TCM records? I seem to recall GM requiring max torque from the TCM in their "snapshot" requirements.

Thread moved to Warranty issues forum.

Got my Onstar monthly report today where they tell you how all the systems are doing. Under each heading I got this message

"We were unable to successfully complete a diagnostic test. This issue may be caused by an aftermarket device plugged into your vehicle's diagnostic port".

I am using a monitor, no tunes or enhancements. But, I think GM can know as much as they want about our vehicles if they take the notion to. :)

I haven't heard of denial for a swapped ECM, but there are a few on here with Tuned stock ECM's that have been denied. Does swapping the ECM change what the TCM records? I seem to recall GM requiring max torque from the TCM in their "snapshot" requirements.

The tech takes a snapshot of the TCM as well before submitting the snapshot data to GM

CC:sfa:

Is anyone acually pulling the exhaust out of the truck before taking it to the dealer?
Seems like a bit of a hastle to me but I guess if you have to in order to play the game.:(

I haven't heard of denial for a swapped ECM, but there are a few on here with Tuned stock ECM's that have been denied. Does swapping the ECM change what the TCM records? I seem to recall GM requiring max torque from the TCM in their "snapshot" requirements.

The TCM will hold in it own memory bank The previous shift points,max Hp,Etc,
Swapping the PCM alone by itself will not get rid of the data,
It would also set a red flag with the warranty rep to have a later model truck in the shop with both the ECM (Diesel) or PCM (Gasser)and the TCM replaced and nothing warrantied on the Global Network,remember both carry longer mileage warranties.
Something i will add that GM Corporate have members on staff that read these forums and the watch the aftermarket as well that is one reason that they are strict the way they are.
There is one sure way to have programed truck and still maintain a valid powertrain warranty and presently I am helping a member on a another forum because he bought a truck chipped when the dealer said it wasn't and they are trying to give him the shaft.
I said over there as well that I will not post how to do it because within 10 minutes GM Corp. would know about it.


CC:sfa: