Does reading/writing a tune leave a trace

[warlock007]

Hi All,

I just bought a new truck and I want to read the tune and change throttle sensitivity but don't want to void warrantee, I can't remember when i took my other truck to the dealer for something if they even noticed it was tuned, tho I never had any updates to the PCM/ECM.

Thanks

[Move'n Up]

Need more details. What is the Make/Model/Year/Engine of the Truck in question?

[warlock007]

2017 Silverado 1500 5.3,

Not really sure why it would matter about the above information to be added as it is a new truck and I'm concerned about voiding warrantee but here ya go

[ScarabEpic22]

2017 Silverado 1500 5.3,

Not really sure why it would matter about the above information to be added as it is a new truck and I'm concerned about voiding warrantee but here ya go

GM has implemented different monitoring/logging strategies on different controllers so it makes a huge difference. Also how they implement Gas vs diesel are different, same with TCM vs ECM.

Can't say if there is a flash counter or not on your truck, I'm sure there is someone who can tell you for sure.

[warlock007]

Kinda thought so but hopefully someone can answer. Thanks for the feed back.

GM has implemented different monitoring/logging strategies on different controllers so it makes a huge difference. Also how they implement Gas vs diesel are different, same with TCM vs ECM.

Can't say if there is a flash counter or not on your truck, I'm sure there is someone who can tell you for sure.

[joecar]

On the newer diesel's the ECM tracks the 10 previous flashes (calibration id, CVN, date, other info), treats flashing-back-to-original as a separate flashing event.

I don't know yet if they have implemented this in the newer gasoline ECM's yet...

the only way to tell is to borrow a high-end scantool (with latest updates), there's a page that shows what/when was flashed... if this page shows up with valid data (i.e. the stock calibration/CVN) then this ECM is tracking flashes, otherwise maybe it's not.

[cindy@efilive]

On the newer diesel's the ECM tracks the 10 previous flashes (calibration id, CVN, date, other info), treats flashing-back-to-original as a separate flashing event.


Just to clarify this...10 UNQIUE flashes based on CVN value. You can't flash a stock tune 10 times to 'clear' the history. You'd need to flash 10 UNQIUE tunes with 10 UNIQUE CVN Values.

Cheers
Cindy

[warlock007]

I don't have access to the higher end scanners anymore so hopefully someone can check on this and let me know.

[Snipesy]

Could of sworn the V2 shows the calibration history.

For what it's worth, GM doesn't push checking it as often as they did. People started getting wise and fighting it since a simple number doesn't really signify the tune was the problem. They could of course read the tune and send it to GM to check, but they don't have the man power to do that.

You can spoof the CVN to match the stock CVN. Actually it's pretty simple to do. The problem is you can no longer differentiate stock from tune. If you got caught that could push liability onto you, so yeah, don't do it.

[joecar]

Actually, on FSV2 you can read the calibration history (if the ECM supports it)... in handheld mode, go down the diagnostics menu.