[Sharp Shifter]

So I want to try and ride this warranty for like 6 months to make sure there are no issues but would have to get rid of that stupid pinched pipe none sense in the back, so can I do a cat back on a boosted car without tuning safely? And yes it will be raced

N/a cars not a big deal but idk being sc if that makes it a problem? Help me out brothers!

[jasonz28camaro]

No problem at all with a catback. Some instances you might need a tune on the other side of the motor but not the backend.

You can always buy another computer and tune using that one. If shit hits the fan just put the factory computer back in and they will never know you did a tune. As you probably already know, they search the history prior to fixing anything and will know even if you put it back to the stock tune.

Hopefully this doesnt get moved to the stupid ZL1 question thread lol. The forum is here to help people with questions like this so keep the questions coming.

[17CamaroZL1]

You'll be fine doing that. The O2 sensors' job is to report any changes to the computer so it can adjust the air fuel ratio as needed. The tune would just squeeze out a few more ponies. Sounds like you already know, but don't make any huge change without having a tuner make sure everything is good.

[Sharp Shifter]

Ya I've raced boosted cars, owned nitrous track cars but never factory boosted vehicles. So wasn't sure how sensitive those things are when on an n/a car it's no problem. Thank you for your fast response guys!

[Mr. Wyndham]

Originally Posted by Sharp Shifter

So I want to try and ride this warranty for like 6 months to make sure there are no issues but would have to get rid of that stupid pinched pipe none sense in the back, so can I do a cat back on a boosted car without tuning safely? And yes it will be raced

N/a cars not a big deal but idk being sc if that makes it a problem? Help me out brothers!

You'll probably be fine...

But before you spend the $$, there is a thread proving that the pinched exhaust pipes don't affect performance very much, if at all...

http://www.camaro6.com/forums/showthread.php?t=431040



If you still want to do a catback exhaust, go for it, of course...but I wanted to offer this.

[Sven59]

Originally Posted by jasonz28camaro

No problem at all with a catback. Some instances you might need a tune on the other side of the motor but not the backend.

You can always buy another computer and tune using that one. If shit hits the fan just put the factory computer back in and they will never know you did a tune. As you probably already know, they search the history prior to fixing anything and will know even if you put it back to the stock tune.

Hopefully this doesnt get moved to the stupid ZL1 question thread lol. The forum is here to help people with questions like this so keep the questions coming.

Actually, they can tell if you swap computers.

[jasonz28camaro]

Originally Posted by Sven59

Actually, they can tell if you swap computers.

Please explaine, I must be behind technology a bit.

The PCM stores calibration events and verification codes for each event. This is used to see if the module has had aftermarket programming. The verification numbers stay with the module.

[Sven59]

There is an old post here somewhere that I think it basically has an embedded serial number and it detects the switch.

[17CamaroZL1]

It's really hard to believe those bent headers didn't really make a difference. Maybe that engine needed some backpressure to run better?

[Mr. Wyndham]

Originally Posted by jasonz28camaro

Please explaine, I must be behind technology a bit.

The PCM stores calibration events and verification codes for each event. This is used to see if the module has had aftermarket programming. The verification numbers stay with the module.

Originally Posted by Sven59

There is an old post here somewhere that I think it basically has an embedded serial number and it detects the switch.

Originally Posted by 17CamaroZL1

It's really hard to believe those bent headers didn't really make a difference. Maybe that engine needed some backpressure to run better?

The BCM (behind the MyLink screen), and the ECM work in tandem. They are coded to each other, and to the VIN of the car. If one is switched, or both, it's obvious, and GM has designed it this way so they can plug the car in and determine if the computer has been modified in any way (doesn't matter the current settings) in just a matter of minutes.

[ForgedReality]

You don't even technically need a tune if you delete the cats. All you have to do is make the sensors think the air at the second o2 sensors is cleaner than it is. You do this by taking them out of the direct flow of the exhaust. You don't want to remove the sensors entirely from the exhaust because they need to sense the heat. But if you pull them back using two "spark plug defoulers" per sensor, one of which drilled with a half inch drill bit, where the sensor goes, and then that assembly goes into the sensor bungs in the exhaust. This tells the computer that the cats are working because the air smells cleaner after the first set of sensors (that you don't mess with). I've done this on several cars and it works great.

However, anything after the cats won't require a tune at all, as everyone else is saying.

[ForgedReality]

Here is how you delete the cats without needing a tune. The only reason you need a tune when the cats fail is because the computer intentionally puts it into limp mode to prevent greater levels of pollution, or maybe just to let you know there's a problem. If the computer doesn't think there's a problem, then, well, there's no problem.

[FLYNNZL1]

Originally Posted by Sven59

There is an old post here somewhere that I think it basically has an embedded serial number and it detects the switch.

The PCM has a flash counter you can tell if it's been tuned the dealers have a special computer the GM gives them, this is true with Corvettes and Camaros. With catastrophic events that's when GM requires the dealer to check this, how many times the PCM has been flashed, Rev limiter and other things, before warranty work can be authorized.

[jasonz28camaro]

I talked to my father in law (master GM mechanic) and he told me the procedure used and the GM bulletin saying how to diagnose a Non GM calibrations when hard part failure occurs, see below.

Basically they check a few things with the tech 2 and see if its been changed. There is no way to check if another computer was used that he knows of. As long as you dont bring it in with a smaller pulley or aftermarket parts requiring a tune they don't dig down too far prior to replacing the motor, trans or any other damaged part. You could get a service manager that checks the ecm mounting hardware for scratches and could start a fuss but cant really do anything about it.

Again though, if anyone knows different please share so nobody uses this info and gets burned.

All numbers mentioned below will stay factory if you pull the computer and do not tune it, tune an extra and you will be fine as long as you do not bring your car in with the 2nd computer installed.

The procedure does not state the BCM at all, therefore this would not necessarily be something they would check. If they dig super deep this could be something that comes up but is not in the procedure. If you bring it in with a built motor they will surely dig deep and try to get out of the warranty.

Service Information Home Publications Number Search New Bulletins Bulletin Search Feedback TIS2Web Help
2016 Chevrolet Silverado - 2WD | Cheyenne, Sierra, Silverado Service Manual 8728227 | Document ID: 4521263
#09-06-04-026M: Identifying Non-GM (Aftermarket) Engine Calibrations for Gasoline Engines Using Tech 2 or GDS 2 (U.S. and Canada) - (May 31, 2016)
Subject: Identifying Non-GM (Aftermarket) Engine Calibrations for Gasoline Engines Using Tech 2® or GDS 2 (U.S. and Canada)

Models: 2005-2006 Chevrolet Corvette — Equipped with any V8 Gasoline Engine
2007-2017 GM Passenger Cars and Light Duty Trucks – Equipped with any V8 Gasoline Engine
2012-2017 GM Passenger Cars and Light Duty Trucks – Equipped with any HFV6 Gasoline Engine
2012-2017 GM Passenger Cars and Light Duty Trucks – Equipped with any Turbocharged 4 Cylinder Gasoline Engine
Attention: Always refer to the GM Service Policy and Procedures Manual for the latest GM Policy and Procedures Information. This Bulletin also applies to any of the above models that may be Export from North America vehicles.
This Bulletin has been revised to add all turbocharged 4 cylinder engines. Please discard Corporate Bulletin Number 09-06-04-026L.

Table of Contents
1. Engine, Transmission, Transfer Case, Rear Axle Components and Catalytic Converter Failures Due to Non-GM ECM Calibrations Being Installed
2. Calibration Retrieval and Calibration Verification Procedure for Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization
3. Calibration Retrieval and Calibration Verification Procedure for Service Agents REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization
4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2® - This Action is Required for ALL Service Agents (Model Dependent)
5. Tech 2® Displaying All Zeroes for the Verification Numbers on the Vehicle Information - Calibration ID and Verification No. (Number/CVN) Screen
6. Retrieving Calibration Information From Global A Vehicles Using GDS 2 - This Action is Required for ALL Service Agents (Model Dependent)
7. Creating a .jpg or .jpeg File From a GDS 2 Calibration History Screen Shot Using Microsoft Paint
8. Calibration Verification Procedure — For Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization — Using the Tech 2® or GDS 2
8. A. Calibration Verification Procedure — Using the Tech 2®
8. B. Calibration Verification Procedure — Using GDS 2
9. Calibration Verification Procedure — For Service Agents REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization — This Procedure MUST be Performed by the Calibrations Group
10. Procedure for ALL Service Agents for E-mailing .jpg or .jpeg Files to the Calibration Group at — TACCVN@gm.com
11. Calibrations Group - New E-mail Address - TACCVN@gm.com
12. Warranty Information
 

1. Engine, Transmission, Transfer Case, Rear Axle Components and Catalytic Converter Failures Due to Non-GM ECM Calibrations Being Installed
Notice:

Be advised that GM REQUIRES retrieving the Calibration Information and performing the Calibration Verification Procedure as outlined in this Bulletin, whenever diagnostics determine a hard part failure may have occurred on internal engine parts and BEFORE disassembly, repair or replacement of an engine assembly under warranty.
Be advised that GM strongly recommends retrieving the Calibration Information and performing the Calibration Verification Procedure as outlined in this Bulletin, whenever diagnostics determine a hard part failure may have occurred on transmission, transfer case or rear axle components and before disassembly, repair or replacement of a transmission, transfer case or rear axle assembly under warranty. It is also recommended that the ECM Calibration Verification Procedure be performed whenever diagnostics determine that catalytic converter replacement is necessary.
It is not a requirement to verify transmission control module calibrations on gasoline engine applications.
General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM ECM calibrations being installed.
When alteration to the GM-released ECM calibration occurs, it subjects powertrain and driveline components such as engine, transmission, transfer case, driveshaft and the rear axle to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED Service Agent Warranty Transaction submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM calibration is confirmed, even if the non-GM ECM calibration is subsequently removed.
Warranty coverage is based on the equipment and ECM calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That’s because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations that are different from those tested and released by GM can damage and/or weaken components, leading to poor performance and/or shortened life.
Additionally, non-GM issued ECM modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install ECM calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties.
This bulletin outlines the Calibration Retrieval and Calibration Verification Procedures for ALL Service Agents including Service Agents NOT Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization and Service Agents Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization, using the Tech 2® or GDS 2 to identify the presence of non-GM control module calibrations.
If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty may be blocked and notated in Global Warranty Management (GWM) and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission.
2. Calibration Retrieval and Calibration Verification Procedure for Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization
Notice:

The Service Agent Service Department Personnel is NOT REQUIRED TO E-MAIL TAC the digital Calibration Verification photos from the Tech 2® screen or GDS 2 screen shot, UNLESS non-GM calibrations are found.
The Service Agent Service Department Personnel is REQUIRED TO RETAIN ALL of the related documentation showing the Calibration Information was Retrieved and the Calibration Verification Procedure was completed, in the Service Agent Vehicle History Service File.
Depending on the vehicle being serviced, the Service Department Personnel is required to complete one of the following procedures, either Step 1.1 or Step 1.2 in order to ensure that there are not any non-GM ECM calibrations present:
Section 4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2®
After retrieving the calibration information, Go to Step 2.
OR
Section 6. Retrieving Calibration Information From Global A Vehicles Using GDS 2
After retrieving the calibration information, Go to Step 2.
After retrieving the Calibration Information and performing Section: 8. Calibration Verification Procedure — For Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization — Using the Tech 2® or GDS 2 the Service Department Personnel is required to retain all of the related documentation showing the procedures were completed in the Service Agent Vehicle History Service File.
If the Calibration Verification Procedure determines that THERE ARE non-GM ECM calibrations present, the Service Department Personnel MUST follow the procedure as instructed in: Section 10. Procedure for All Service Agents for E-mailing .jpg or .jpeg Files to the Calibration Group at — TACCVN@gm.com
When returning an engine assembly a printed copy of the Tech 2® Vehicle Information - Engine Calibration ID and Verification No. (Number/CVN) screen or the GDS 2 Calibration History (Events) screen shot must be attached to the documentation being returned with the unit.
Notice: For additional information regarding: Service Agents NOT Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization, refer to the latest version of Corporate Bulletin #12-07-30-001 Information for Service Agents Not Required to Contact Product Quality Center (PQC) for CNG, LPG or Gasoline Engine, Transmission and/or Transfer Case Replacement Authorization

3. Calibration Retrieval and Calibration Verification Procedure for Service Agents REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization
Notice:

The Service Agent Service Department Personnel is REQUIRED TO E-MAIL TAC the digital Calibration Verification photos from the Tech 2® screen or GDS 2 screen shot in .jpg or .jpeg format only, to the following e-mail address: TACCVN@gm.com
The Service Agent Service Department Personnel is REQUIRED TO RETAIN ALL of the related documentation showing the Calibration Information was Retrieved and the Calibration Verification Procedure was performed by the Calibrations Group which is their e-mail response, in the Service Agent Vehicle History Service File.
Depending on the vehicle being serviced, the Service Department Personnel is required to complete one of the following procedures, either Step 1.1 or Step 1.2 in order to ensure that there are not any non-GM ECM calibrations present:
Section 4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2®
OR
Section 6. Retrieving Calibration Information From Global A Vehicles Using GDS 2
After retrieving the Calibration Information and referring to Section: 9. Calibration Verification Procedure — For Service Agents Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization — MUST be Performed by the Calibrations Group , follow the procedure in Section 10. Procedure for All Service Agents for E-mailing .jpg or .jpeg Files to the Calibration Group at — TACCVN@gm.com
The Service Department Personnel is required to retain all of the related documentation showing the procedures were completed in the Service Agent Vehicle History Service File.
When returning an engine assembly a printed copy of the Tech 2® Vehicle Information - Engine Calibration ID and Verification No. (Number/CVN) screen OR the GDS 2 Calibration History (Events) screen shot must be attached to the documentation being returned with the unit.
Notice: For additional information regarding: Service Agents Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization, refer to the latest version of Corporate Bulletin #02-07-30-029 Product Quality Center (PQC) Assembly Replacement Process

4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2® - This Action is Required for ALL Service Agents (Model Dependent)
Notice: This information applies to vehicles that are Tech 2® compatible and is typical of the procedure that will be used.

Connect the Tech 2® to the vehicle.
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 the Module ID Information selection is not available.
If: "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information.
If the CVN information is displayed as “N/A”, it will be necessary to contact the TCSC at 1-800-828-6860 for English or 1-800-503-3222 for French to obtain the CVN information.
If the CVN Information is displayed as all zeroes, refer to Section: 5. Tech 2® Displaying All Zeroes for the Verification Numbers on the Vehicle Information - Calibration ID and Verification No. (Number/CVN) Screen

Object ID: 2278650Click here for detailed picture of the image.

Object ID: 2889412Click here for detailed picture of the image.
Notice:
Two examples of the Tech 2® Vehicle Information - (Engine) Calibration ID and Verification No. screens are shown.
The Tech 2® Vehicle Information - Calibration ID and Verification No. screen will differ slightly depending on vehicle and model year.
Take a CLEAR digital picture(s) of the Tech 2® Vehicle Information screen showing the entire VIN, (Engine) Calibration ID and Verification No. (Number/CVN) and save it in .jpg format.
Notice: It is recommended that an electronic copy of the Tech 2® screen photograph(s) also be saved.
Retain the printout information and the Tech 2® screen photograph(s) with the repair order.
5. Tech 2® Displaying All Zeroes for the Verification Numbers on the Vehicle Information - Calibration ID and Verification No. (Number/CVN) Screen

Object ID: 2363198Click here for detailed picture of the image.
If the Tech 2® that is being used displays all zeroes for the Verification Numbers as shown, then perform the following steps:
Update the Tech 2® with the latest software from TIS2WEB.
Turn OFF the ignition for 90 seconds.
Connect the Tech 2® to the vehicle.
Turn ON the ignition, and build the vehicle. Observe the Tech 2® Vehicle Information - Calibration ID and Verification No. (Number/CVN) screen for proper operation.
If the Tech 2® screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation.
6. Retrieving Calibration Information From Global A Vehicles Using GDS 2 - This Action is Required for ALL Service Agents (Model Dependent)
Notice: This information applies to Global A - GDS 2 compatible vehicles and is typical of the procedure that will be used.

Turn OFF the ignition.
Connect the MDI to the Data Link Connector (DLC) of the vehicle.
Notice: Use the USB port to make the following MDI connection:
Connect the MDI to a PC or laptop that has been downloaded with the GDS 2 application from TIS2WEB.
Notice: At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS 2 was just installed, select: Add New Diagnostic Package and then select a: Diagnostic Package to download.
Select: GDS 2 icon on the PC.
Select: Diagnostics icon.
Select: serial number of the MDI being used.
Select: Enter icon.
Select: Module Diagnostics.
Select: Engine Control Module.
Notice: Due to the model selected, vehicle build, software and RPO variations, GDS 2 may ask for additional information in Step 10.
Select: Engine ID, if prompted.
Select: ID Information.
The Diagnostics page will appear.

Object ID: 2889523Click here for detailed picture of the image.
Notice: This is a typical view of a GDS 2 Calibration History Events Screen. GDS 2 is capable of displaying up to 10 Calibration History Events.
Select: Calibration History from the drop down menu in order to display the following items on the screen, including the VIN:
Calibration History Buffer
Number of Calibration History Events Stored
Calibration Part Number History
Calibration Verification Number History
Select: Save Report.
Select: Print.
Notice: It is recommended that an electronic copy of the GDS 2 Calibration History also be saved. Refer to Section: 7. Creating a .jpg or .jpeg File From a GDS 2 Calibration History Screen Shot Using Microsoft Paint
Retain a copy of the printed screen shot with the repair order.
7. Creating a .jpg or .jpeg File From a GDS 2 Calibration History Screen Shot Using Microsoft Paint
Select: Start icon.
Select: All Programs.
Select: Accessories.
Select: Paint.
Navigate to: Calibration History .
Press the: Print Scrn button.
Open: Microsoft Paint.
Select: Paste.
Select: Save As.
Select: Desktop.
Select: File name. Name the file. As an example use the VIN.
Select: Save as type, using the drop down menu.
Select: JPEG
8. Calibration Verification Procedure — For Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization — Using the Tech 2® or GDS 2
Go to: TIS2WEB Home Page.

Object ID: 3340046Click here for detailed picture of the image.
Select: Calibration Information (SPS Info).

Object ID: 3340097Click here for detailed picture of the image.
Enter the: VIN.
Select: Get Cal ID.

Object ID: 3340122Click here for detailed picture of the image.
Select: ECM Engine Control Module — Programming from the Controller dropdown menu and select: Next.

Object ID: 3340145Click here for detailed picture of the image.
Select: Complete History at the top left or bottom left of the page to access the GM Vehicle Calibration Information screen, which displays all of the GM Approved Calibrations and CVNs (Calibration Verification Numbers).
If the vehicle being serviced requires using the Tech 2® , Go to subsection: 8. A. Calibration Verification Procedure — Using the Tech 2®
If the vehicle being serviced requires using GDS 2, Go to subsection: 8. B. Calibration Verification Procedure — Using GDS 2
 
8. A. Calibration Verification Procedure — Using the Tech 2®
 
Object ID: 3336860Click here for detailed picture of the image.
Compare each: Calibration ID Part Number and Verification No. (Number/CVN) from your Tech 2® photo 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 and you should follow the procedure in Section: 10. Procedure for All Service Agents for E-mailing .jpg or JPEG Files to the Calibration Group at — TACCVN@gm.com in order to e-mail your findings to the Calibration Group, who will then document your information with the appropriate Brand Quality Manager in the Brand Quality Team.
 
8. B. Calibration Verification Procedure — Using GDS 2
 
Object ID: 3338923Click here for detailed picture of the image.

Object ID: 3339024Click here for detailed picture of the image.
Compare each: Engine Calibration Part Number History parameter and Calibration Verification Number History parameter from the GDS 2 Calibration History screen to the Calibration Part Number and Calibration Verification Number (CVN) listed in the GM Vehicle Calibration Information screen of TIS2WEB to ensure that they are ALL an EXACT MATCH.

If ANY Engine Calibration Part Number History parameter and Calibration Verification Number History parameter when COMPARED to the Engine Calibration Part Number History parameter and Calibration Verification Number History listed in the TIS2WEB GM Vehicle Calibration Information screen, DO NOT MATCH, then non-GM calibrations may be present and you should follow the procedure in Section: 10. procedure for All Service Agents for E-mailing .jpg or JPEG Files to the Calibration Group at — TACCVN@gm.com in order to e-mail your findings to the Calibration Group, who will then document your information with the appropriate Brand Quality Manager in the Brand Quality Team.
9. Calibration Verification Procedure — For Service Agents REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization — This Procedure MUST be Performed by the Calibrations Group
Notice: For Service Agents Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization, the Calibration Verification Procedure MUST be Performed by the Calibrations Group

Assemble the Calibration Information that was retrieved when you performed Section: 4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2® - This Action is Required for ALL Service Age