bluekey28

I'm sure this has been asked but a search of posts comes up empty. My On-Star connection seems to know everything about my '17 Z06. Will it detect if I download a tune from a Diablo Sport tuner. Not looking for anything radical tune wise, just bumping up the efficiency after installing a CAI. Any proof out there or just speculation? Thank you.

Zymurgy

It doesn't really matter if OnStar can detect it or not. If you have a significant powertrain issue, they will check the ECM and they WILL find the tune has been done (even if you "undo" it) and a warranty block will be placed on your powertrain.

The basic process is:

Dealer can get the complete history of all the GM Approved Calibrations and CVNs (Calibration Verification Numbers) from the TIS2WEB site using the VIN and choosing the ECM.

Calibration Verification Procedure — Using the Tech 2®

Compare each: Calibration ID Part Number and Verification No. (Number/CVN) from your Tech 2® to the corresponding Calibration ID Part Number and Verification No. (Number/CVN) listed in the TIS2WEB GM Vehicle Calibration Information screen of TIS2WEB to ensure that they are ALL an EXACT MATCH.

If ANY of the Calibration ID Part Number and Verification No. (Number/CVN) when compared to the Calibration ID Part Number and Verification No. (Number/CVN) listed in the TIS2WEB GM Vehicle Calibration Information screen, DO NOT MATCH, then non-GM calibrations may be present.

I believe the tool used on 2014 and newer is now called GM MDI/GDS-2.

Foosh

Yep, you better really want that tiny bump in HP because it WILL cause your powertrain warranty to be blocked should you ever need it. You can't hide it because the fingerprints will remain, no matter what you try after loading a non-OEM flash.

bluekey28

ZYMURGY;
Thank you for the detailed info. I now recall reading a similar response to the same question several years ago. At the time my previous Vette was out of warranty so my concerns were less.

bluekey28

Thank you for the valuable info. My Z has only 800 easy miles on it. Do not plan on tracking or hard driving the car. My thinking is any failures or warranty would not be due to hard usage. In any event, leaving well enough alone would be the prudent thing to do.

Dcasole

A Diablo is the only tuner that does not alter the tune log file , get a custom tune from Diablo Lew and your gains in HP and drivablity will be significant over the can tunes that are included

Absolutely 100 % undetectable ......PM Mike at Diablo ...

Dave

Dcasole

Not when u use a Diablo ......

It does not leave any fingerprints .....the CVN file remains unchanged no matter how many times you upload or restore the original tune ...

Dave

HorsePower Junkie

Dave, are you sure about that?

Has anyone verified this to be correct?

Would hate to see one used, and then find out later that it is detectable, and end up seeing a blocked warranty.



.

HorsePower Junkie

If I recall correctly I seem to remember that a C6 original ECM could be replaced with one that would be tuned, and then later the original reinstalled.


Can the original C7 ECM be removed, and replaced with one that is to be tuned and modified, and then later reinstall the original ECM that is free of traces that are detectable of any modifications?


.

Dcasole

Oh yes I am 100% sure about it , let's just say I have a friend that had a catastrophic failure and this failure had absolutely nothing to do with a tune but the first thing that was checked was the tune file....the CVN file was an exact match .....

There are thousands of diablo tuners out there not just for GM but Chrysler's and Ford also , you don't think that with all those tuners out there and with the Diablos Claim that their tunes cannot be detected, that it would not be all over the internet forums if the statement was not true .

Then there are the claims that the Handhelds like the Diablo are not worth it ..... do a custom mail order street tune with CMR software is no different than street tuning with HP tuners or EFI live ......log the car. Make changes , log car .. rinse and repeat. Plenty of well known tuners offer mail order tunes , the difference only being that a Diablo uploaded Tune is undectable....

Dave

Indy Jim

Does the Range device that disables 8 cylinder to 4 cylinder mode leave a 'finger print'?

Dcasole

Nope , because the milage in the ECM will not match the mileage held in the speedometer cluster , when a new cluster is installed there is a procedure to have it read the mileage from the ECM . You can not do the update but there will be the mismatch in milage which is also checked . Later ECMs have been encrypted by GM to try and stop the ECM from being modified
This will only lead to Add On Devices. I can buy a add on control unit for my AMG that will add 50 to 75 HP for only 300 bucks ...

Dave

Dcasole

No , you are not modifying the tune file in any way with a range , you are just tricking the ECM into thinking that the conditions for going into 4 cylinder mode are not met , this keeps the car in V8 mode

Dave

Vetteman Jack

Yeah, would not be worth it to me as I would want the warranty in place.

Jeff V.

Mileage on the C7 is stored in the cluster and the BCM. But there are other security functions that prevent you from swapping ECMs back and forth.

fishpick

There are totally ways to swap ECM / PCM and any other module including the cluster - you just have to have the right tools. In the Ford world you can find a Chinese VCM2 knockoff with a cracked IDS application on eBay for about $100... the real versions are like $1200 + IDS subscription... and you can reprogram anything with any version from anywhere... this is not tuning, it's swapping clusters, changing ABS, flashing factory PCM data, changing build codes to add or remove options.

GM has the same tools for their techs that do the same things... I don't know about Chinese version or availability - but I'm pretty sure they are out there - like with anything - where there is a will there is a way!

Dcasole

[QUOTE=Jeff V.;1598882569]Mileage on the C7 is stored in the cluster and the BCM. But there are other security functions that prevent you from swapping ECMs back and forth.[/QUOTE

Yes but they all can be worked around as you have to program the ECM and any module that connects to the ECM anyway ...there are guys that are doing now but there is still a mileage gap

Dave

Dcasole

I am not saying it can't be done , there are guys who have what I am saying is you cant change the milage in the old ecm as it will be detected, the speedometer will have one reading and the ECM the other .

First you would need that subscription , then your flash from the TIS web site will be logged , this will be the instant tip off that you changed out the ECM as the CVN file in the old unmodified ECM will not match what GM has on record, it will also show that the dealer did not pull the file down .....then you have to program each module in the car .....

Just buy a Diablo and be done with it all lol lol ......

Dave

C7/Z06 Man

DITTO.. From what I have read/seen & experienced.

This seems to be a on going battle here; But not for me.

Just remember to re-install the 'stock tune' before taking your vehicle to the dealer for 'anything'. Why? because the dealer may install an update to your ECM/PCM while its there.

Foosh

Re-flashing the OEM tune makes does you no good if you have an engine problem requiring warranty work. They will find the fingerprints of your previous non-OEM flashes, your warranty claim will be denied, and your powertrain warranty will be blocked.

As long as you never have an engine problem, or never put in a warranty claim on engine or powertrain-related issues, you'll be fine. However, as soon as you install a non-OEM tune, you have effectively ended your powertrain warranty.