#08-06-04-033: Identifying Aftermarket Engine Calibrations - (May 30, 2008)
Models: 2006-2009 GM Passenger Cars and Light Duty Trucks
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):
Go to TIS2WEB
Select "Calibration Information (SPS Info)"
Enter VIN
Select "Get Cal ID"
Select "ECM Engine Control Module"
Select "Next"
Select "Complete History"
Print
Take the printout to the vehicle along with the Tech 2®
Plug in the Tech 2®
Go to diagnostics and build the vehicle
Select "Powertrain"
Select "Engine"
*Select "Engine Control Module" or "PCM"
*Select "Module ID Information" or "I/M Information System" if module ID information selection is not available.
*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.
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.
