For All You Guys That Have "reprogrammed The Ecm/pcm"

[jimbello]

I know this was discussed a bit in other posts but I was looking through my AlldataDIY and found this. Seems they do look to see if the factory program has been altered

 

Your Vehicle: 2008 Chevy Truck Silverado 1500 2WD V8-5.3L

 

 

Vehicle » Technical Service Bulletins » All Technical Service Bulletins » Engine Controls - ECM/TCM Aftermarket Calibration ID Notes

 

 

 

Engine Controls - ECM/TCM Aftermarket Calibration ID

 

 

INFORMATION

 

Bulletin No.: 08-06-04-033B

 

Date: August 26, 2008

 

Subject:

Identifying Aftermarket Engine and Transmission 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 and 6T40/45 (MH8), 6T70/75 (MH2, MH4, MH6, MY9), 6L50 (MYB) 6L80 (MYC) or 6L90 (MYD) Automatic Transmission

 

Models:

2006-2009 GM Passenger Cars and Light Duty Trucks

2006-2009 HUMMER H2, H3

 

EXCLUDING Pontiac Vibe, Wave, Chevrolet Aveo, All Saturn and Saab Models

 

Supercede:

 

This bulletin is being revised to remove the Pontiac G8 from the list of excluded vehicles. Please discard Corporate Bulletin Number 08-06-04-033A (Section 06 - Engine/Propulsion System).

 

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 engine, 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.

[Stevens03]

Interesting.... Diablo assures me that GM can NOT see any changes (if reverted to stock tuning). One of the reasons I choose Diablo over custom.

 

Steven

[VMax2007]

And this is new how? This has been posted about 8000 times already, and is the key reason MOST people under warranty buy a 2nd set of modules for tuning.

[DofD]

 

The man knows what he's talking about. With a second set of modules, one stock, one custom, swap the stock ones in when you go for service.

[Jennabear]

Or you can just know the codes....

[redvett]

The problem with using a second set of PCM's is the counter will be started on the old PCM and the tech will know you switched. They will then have figured out that a switch has been made.

[VMax2007]

The problem with using a second set of PCM's is the counter will be started on the old PCM and the tech will know you switched. They will then have figured out that a switch has been made.

 

Rumors!

 

I'd also like to see them prove that. Switching modules does not prove that you used a non-OEM calibration.

 

Also, If this is true, then tell me why GM has asked dealers who are suspicious of Vette and Diesel owner's vehicles to seal the harness connector to the module to make it "tamper-proof"?

[redvett]

Use a data scanner and you will find the timer. With the timer at a low count it will make GM suspicious.

 

The problem with using a second set of PCM's is the counter will be started on the old PCM and the tech will know you switched. They will then have figured out that a switch has been made.

 

Rumors!

 

I'd also like to see them prove that. Switching modules does not prove that you used a non-OEM calibration.

 

Also, If this is true, then tell me why GM has asked dealers who are suspicious of Vette and Diesel owner's vehicles to seal the harness connector to the module to make it "tamper-proof"?

 

[Z71kris]

[tobias]

Interesting.... Diablo assures me that GM can NOT see any changes (if reverted to stock tuning). One of the reasons I choose Diablo over custom.

 

Steven

 

I've seen them say that quite a bit but posting it and proving it are two different things.

[alaska511]

Very interesting

[matt3]

Or you can just know the codes....

 

What do you mean by know the codes?

[ajcain79]

blah blah blah

 

I don't think it will be an issue. I'm still tuning my truck this summer!

[mattgob86]

 

[VMax2007]

Obviously this "suspicion" is not proof and thereby not grounds for voiding any warranties, otherwise GM would not have asked dealers to seal harness connectors.

 

 

Use a data scanner and you will find the timer. With the timer at a low count it will make GM suspicious.

 

The problem with using a second set of PCM's is the counter will be started on the old PCM and the tech will know you switched. They will then have figured out that a switch has been made.

 

Rumors!

 

I'd also like to see them prove that. Switching modules does not prove that you used a non-OEM calibration.

 

Also, If this is true, then tell me why GM has asked dealers who are suspicious of Vette and Diesel owner's vehicles to seal the harness connector to the module to make it "tamper-proof"?