I have a 2009 Silverado that I would like to get a tuner for but I was told that the dealer or Onstar diagnostics can detect this, is this true?
Printable View
I have a 2009 Silverado that I would like to get a tuner for but I was told that the dealer or Onstar diagnostics can detect this, is this true?
Not sure about detection but when I plugged in my old programmer into the OBDII port, my vehicle diagnostic emails were all jacked up saying it couldn't communicate with the vehicle. On another note, I seriously doubt the people at OnStar have the personnel to be checking every OnStar-equipped vehicle for after market no-nos.
I would think that a live tune (or at least a mail-oreder tune) wouldn't be detectable...but don't quote me on that. Maybe someone else can chime in...
my 08' is doing fine with m/o tune
I think if they are really looking for it, they can find it.
Plus, something about the number of times a pcm is flashed as well.
Yes It Leaves What Is Called A "footprint" In The Computer.
why would on star even be interested in such a thing? i mean isnt it intended for help and service to those that need it, who cares if your shit it tuned? maybe except for the dealer after blowing a tranny or killing the motor or some such thing.
Quote:
Originally Posted by 6gear
my 09 is tuned and its been to the dealer twice, the dealer can detect it but why would on star even wanna know?
there is a history of the pcm in the computers. it shows everything you have done to that pcm. even the 411 pcms show that. so yes its trackable
years ago there was a story of a z06 that went in for hurt motor. they had found out teh tune was the cause and didnt warrenty the bill. owner had something like 15k bill handed to him.
makes you think twice about who you chose to do a tune for ya
That's why I kept my stock PCM and tuned my spare PCM. I just re-installed the stock PCM for trips to the stealership.
I know some tuners claim to have "stealth" tunes that can not be detected.
I'm a tech at a gm dealer and it easy to find tunes but to this point the only prob we have ran into is if there is a module update and the module is locked (warrenty reasons only) or on dirtymax's max torque output is stored and we can tell if a tuner has been on the vehicle. this is only a problem when the engine is f'ed and go to warrenty the engine and gm requires a snapshot of the vin and max torque out from a tech2
otherwise no one at the dealership cares just if GM is going to warrenty the pcm or an engine
lmao thats what i was thinking,ill tell u one one thing they do know when your doing donuts,dont ask how i know :doofus:Quote:
Originally Posted by skeet
Oh yeah, we know. OnStar don't though.
So even though and engine is returned to stock tuning the dealership can still detect it? So is the only way around this to purchased a spare pcm?
My girlfreinds father works at the local Chevy dealership and has told me that they have to put your vehical on a computer anytime warranty work is needed. I dont know all the details but apparently they can detect if any tuner has been put on it. I guess I can look at that as a good thing about my warranty ending a long time ago lol
I like the idea of having a stock pcm to throw in. anyone know what i should pay for one? Do i have to buy from dealer?
Quote:
Originally Posted by bam
Same here I would be interested in doing the same thing but would the different computers show a mileage discrepancy?
No.Quote:
Originally Posted by 6gear
Spare PCMs are anywhere from $20-$40. I did this with mine. Its always good to have your stock, unmolested PCM to plug in...
Something to consider: I recently asked my dealer service rep if the dealership could reprogram my PCM if I change my gear ratio. The answer is no - that the dealership is no longer allowed to reprogram for gear ratios. Therefore, in order to correct my odometer and not have the speed sensor throw a code, what other choice would I have but an aftermarket programming/tuning? So naturally after a gear change, I would instruct the service rep not to plug into the PCM so that they do not override the corrected/reprogrammed gear ratio. The dealership would be on the hook to reimburse the customer to make it right again.
Just some food for thought.
I wish techs could use spelling and grammar better on the interwebz.
No, we don't look for tunes as a rule. There is no magic computer that tells us thus. There is no policy that makes us look for tunes on everything.
Yes, we can detect tunes on SOME newer CAN-bus systems but GM's system is fairly unreliable on proving a non-stock file. Yes, GM is now putting pressure on the dealer to actually provide a snap-shot or even a digital picture of the TechII calibrations installed screen on some (means more in the future likely) major powertrain failures. Yes, a tech can waste his flatrate time searching for mods and tunes on stuff all day with the hopes of trying to make a case for the dealer to decide to deny warranty. Then again, we need work to pay the mortgage and would rather try to deny warranty in obvious cases of abuse instead of tunes.
There were about 7 other misnomers in the topic I may not have addressed properly.
Oh yeah, anyone on the internet, on TV, or writing in a magazine that's affraid of OnStar is pretty small minded when it comes to tunes. It makes me wanna puke (while laying flat on my back) when I hear someone talking about pulling the OnStar fuse to tweak the computer or even use a crappy hand held.
Friend of mines dad put the edge with attitude on his 08 duramax......onstar sent him a letter saying there was aftermarket components pluged into the vehicles system (it was worded different) but you get the idea.