http://forums.corvetteforum.com/showthread.php?t=1980086

[ edit ] And some further explanation:

http://forums.corvetteforum.com/showthread.php?t=1981427

I guess two ECM's are the only way around that.

I guess two ECM's are the only way around that.

see second link I added....

That whole thing is 100% fabricated, same guy started the exact same rumor last year LOL

Chris, so this isn't true? We can still tune our vehicles?? I hope so. You did my Trailblazer SS and couldn't be happier with the results. Not just the performance, but the driveability as well. I feel all we are doing is taking what GM did, and making it that much better.

LOL No, its not true :)

If something like this were true, wouldn't there be some sort of service bulletin or official document from GM educating their service technicians on how something like this works? We've had enough information about the G8 leak out here pre-production that was 100% accurate...I'd like to think that we'd have someone on the inside that could (in)validate this.

Just curious. Either way, I'm already tuned.

I am not sure if that is true or not in regards to the G8's or Vettes.

But, I can tell you that is 100% true of the GM diesel trucks. I am a member of a diesel site that has MANY GM employees who have confirmed this and posted the bulletins sent to their techs and service advisors.

Yeah but the diesel controller family is completely different, this whole new thing is a scam LOL

Yeah but the diesel controller family is completely different, this whole new thing is a scam LOL

I was just reading on my forum for the tuner I have. They are saying this is 100% true. There will be a service bulletin being sent out very shortly to tech's at dealerships. The older model pcm's have nothing to worry about. But, the newer ones do have the same thing as the new diesels that detect when a flash has occured. If it does not sync up with what is in GMs system you may be paying out of your own pocket.


http://forum.efilive.com/showthread.php?t=7657


Probably not going to stop me though. I'll wait to see if exhaust is enough.

It's the same crap that one guy started last year and no one is sure why, it got crossposted all over the place to freak people out. It worked LOL I

Oh well, just gonna be stuck with ****ty shifts til the warranty runs out. Maybe gm will come out with a bulletin to fix the bad shifts this thing makes. Build a great motor, probably the best small block any car company has ever built, put a ****ty computer program in it and make the trans feel some sloppy girl you took home when you were drunk one night. Well you know what I mean. I wasn't talking about myself you know. Just general terms.
locrzn

Posted yesterday:

Yes, the PCM detects and RECORDS the last 10 upload and download sequence.
And yes, it can be seen by a technician with a Tech 2.

Guess I need to buy a second ECM just to be safe since there is conflicting info going around.

Better yet, how about someone finds out first hand. Who's going to step up to the plate?

I don't care. I am tuning mine whether or not they can or can not see it. I will flash back to stock for warranty work. But, if I break something and it's because of something I did it will come out of my pocket.

Posted yesterday:

Yes, the PCM detects and RECORDS the last 10 upload and download sequence.
And yes, it can be seen by a technician with a Tech 2.

Guess I need to buy a second ECM just to be safe since there is conflicting info going around.

Better yet, how about someone finds out first hand. Who's going to step up to the plate?

That is false (at least as far as we are concerned) there was a rumor going around that the diesel controllers could do that but after seeing the TSB for both the gasoline and the diesel engines there is nothing new they are simply looking at Calibration ID's and CVN's the same stuff they have had since the tech 2 was released years ago. This is nothing new, no new software or conspiracy ect just a gentle reminder to the dealers that they have the ability to check this if they deem necessary. No doomsday stuff ;)

Yes, the PCM detects and RECORDS the last 10 upload and download sequence. And yes, it can be seen by a technician with a Tech 2.
As GTPprix mentioned above, this rumor is completely unfounded. Our company has done several hundred late model GM dyno tunes, and several thousand mail order PCMs, and this has never been an issue before. Not even once. :)

Corporate Bulletin Number 08-06-04-033 is currently available in SI.

Identifying Aftermarket Engine Calibrations 2.0L, 2.2L, 2.4L, 2.8L, 2.9L, 3.0L, 3.1L, 3.2L, 3.4L,
3.5L, 3.6L, 3.8L, 3.9L, 4.2L, 4.3L, 4.4L, 4.6L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L, 7.4L, 8.1L
Gas Powered Engines Only

Models: 2006–2009 GM Passenger Cars and Light Duty Trucks
2006–2009 HUMMER H2, H3
Excluding Pontiac Vibe, G8, Chevrolet Aveo, All Saturn and Saab Models

Important: This bulletin applies to Gas Powered Engines ONLY. For Diesel Powered Engines, refer to Service Bulletin #08-06-04-006A.

If a suspicious hard part failure is observed in the engine, transmission, transfer case or driveline, perform the calibration verification described to determine if a non-GM issued engine calibration is installed. Non-GM issued engine calibrations subject driveline components to stresses different than the calibrations which these components were validated to. Repairs to transmission, transfer case and/or other driveline components where a non-GM engine calibration has been verified are not covered under the terms of the New Vehicle Warranty.

Instructions for Confirming Calibration Verification Number (CVN):

1. Go to TIS2WEB
2. Select "Calibration Information (SPS Info)"
3. Enter VIN
4. Select "Get Cal ID"
5. Select "ECM Engine Control Module"
6. Select "Next"
7. Select "Complete History"
8. Print
9. Take the printout to the vehicle along with the Tech 2®
10. Plug in the Tech 2®
11. Go to diagnostics and build the vehicle
12. Select "Powertrain"
13. Select "Engine"
14. *Select "Engine Control Module" or "PCM"
15. *Select "Module ID Information" or "I/M Information System" if module ID information selection is not available.
16. *If "I/M information System" was selected in step 15, it may be necessary to select "Vehicle Information" in order to display the calibration information.
17. Compare the calibration ID and Calibration Verification Numbers (CVN) to the Calibration Verification Numbers (CVN) on the printout.

* Steps may vary by controller.

Although the part numbers will be the same for each, it's the CVN that will determine if the calibration is GM issued. If ALL of the CVN's are EXACTLY the same, the calibration is GM issued.

If the part numbers match and ANY CVN's DO NOT match the printout, it is likely that a non-GM certified calibration has been installed.

If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information.

If a non-GM calibration is found to be in the ECM (CVN's on the Tech 2 do not match TIS printout) - In order to document the case — a CLEAR digital picture should be taken of the Tech 2® screen showing the VIN and the CVN's that do not match the TIS2WEB printout. The picture, VIN and reason the vehicle is currently in for service should be emailed to ... deleted ... and ... deleted ... for verification. Please copy your GM District Service Manager (DVM) on the e-mail. GM will verify if the CVN's are not GM issued and respond via e-mail within 72 hours.

"Excluding G8"....

I have access to a Tech 2 thanks to my father who has been working as a tech for GM for 30 yrs. He has never mentioned any sort of plans or training updates that suggest this. I did a conversion from OBD1 to OBD2 for my 97' LT1 in the past and the Tech 2 can no longer communicate with the vehical. So in order to keep the warrenty(so my dad got the commision for working on my car) we swapped back to the original. So just in case,its best to have the original or to reflash to stock when going in for service. If you guys arent prepared for your warrnty to be expired then you shouldnt be touching it. Im modding my G8 the same day I get it.:gears:

"Excluding G8"....

Exactly.
Hence the title of my post.
- Ray
Wondering what, exactly, is so special about the G8's calibration?????

GM will probably close this gap if they are looking for tuned vehicles. Maybe VMS can chime in why the G8 calibration is exluded?

What about an exhaust. Once that is modified it is pretty hard to switch back for warranty work. If a dealer sees a new exhaust then in theory, they could deny a powertrain warranty also. Someone needs to fight it in court so people know one way or another. I think it would only apply in case of a blown motor or broken tranny, not a bad sensor or defective part.

What about an exhaust. Once that is modified it is pretty hard to switch back for warranty work. If a dealer sees a new exhaust then in theory, they could deny a powertrain warranty also. Someone needs to fight it in court so people know one way or another. I think it would only apply in case of a blown motor or broken tranny, not a bad sensor or defective part.


The first part of the bulletin states:

"If a suspicious hard part failure is observed in the engine, transmission, transfer case or driveline, perform the calibration verification described to determine if a non-GM issued engine calibration is installed."

I agree. I don't believe dealers are going to care unless you break something big. Even then they have to prove the failure was caused by the tune. Just seeing an exhaust is not grounds to dismiss your warranty.

--Mike

Guys again, this techonology has been around for 12-13 years (since the Tech 2's inception) There have always been Cal ID's and CVN's. They sent out a TON of these when LS1 Edit came out and they have been pretty late since HP tuners came out, it was due. It's all old info. The ECM/TCM (when flashed with software other than GM's own) does not record how many times it's been flashed or by whom on what date ect. Aftermarket software doesnt write those blocks.

If you are REALLY worried about it get a spare ECM for dealer visits.

Isn't the L76 the same motor as the corvette LS3 minus the cam and intake? If that is the case, the crank, pistons and heads should be able to withstand up to 425 Hp easily. A 20 HP gain via tune should not be breaking cranks.

I'm sure the transmission is also something similiar to what is on the vette, so that should be able to handle the torque also.

Isn't the L76 the same motor as the corvette LS3 minus the cam and intake? If that is the case, the crank, pistons and heads should be able to withstand up to 425 Hp easily. A 20 HP gain via tune should not be breaking cranks.

I'm sure the transmission is also something similiar to what is on the vette, so that should be able to handle the torque also.

No, its very similar to the LS2. The bore is slightly smaller, not much, and there is different intake and heads, and the AFM. Not sure about the internals, like crank, pistons and rods, but they should be similar.

Very good infor in this thread on the ls1tech forums.

http://www.ls1tech.com/forums/showthread.php?t=915776

Holy old thread batman!

http://imaginarycinema.com/images/burton/batmantv.JPG

Hey, dodson - where ya been? :)