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Look Out! Big Brother Could Be Watching.....

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I found this tonight and thought I would post it..... Whats your thoughts? :icon_bs:



Corporate Bulletin Number 08-06-04-033


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 [email protected] and STEVEN.R. [email protected] 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.



Edited by TheWaterboy (see edit history)
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*yawn* old news; if you are worried about your powertrain warranty then save your original PCM and reinstall it before visting the dealer.


Mr. P.




legally they can't void the warranty unless they can prove that the tune caused the failure.


but trust me that with the economy at its current state, lots or dealers won't just be giving away warranty dollars.

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  • 4 years later...

google magnuson moss act of 1975

it states about warranty deals.

It's easy to say that. My buddies radix truck was at the dealership for over a month while the servicing dealership and the dealership that sold him the truck (radix was installed by selling dealership) went back and forth about coverage. To get it back to the selling dealership he would have had to ship the truck since it wasn't anywhere close to him. Even the Magnuson extended warranty didn't cover the damage since he didn't "break" anything, just burned up all the friction material in the tranny.

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