SERVICE - CHEVROLET AND GMC DEALERS

Subject: Information on Identifying Non-GM Calibration Usages for LMM Duramax Diesel Engines
Message #: VSS20081381
Corporate Bulletin Number 08-06-04-006 is currently available in SI.

Information on Identifying Non-GM Calibration Usages for LMM Duramax® Diesel Engine
Models: 2007–2008 Chevrolet Express, Kodiak, Silverado
2007–2008 GMC Savana, Sierra, TopKick
with 6.6L Duramax® Diesel Engine (VIN 6 — RPO LMM)
Power-Up Kit Detection
For 2007–2008 applications, an Engine Control Module (ECM) algorithm was implemented that records the engine calibration part number and Calibration Verification Number (CVN) for the last flash programming events. The ECM only records the engine calibration part number because it contains the parameters for increasing torque and fueling rates.
Customers may have re-programmed the ECM with a non-GM released calibration. Power-Up Kit calibrations change fueling and timing parameters and may contribute to the following vehicle symptoms:
• Poor Performance
• Black Smoke (This symptom is not valid for the 6.6L (LMM) diesel equipped with the diesel particulate filter (DPF). The DPF will trap black smoke
unless the DPF is cracked, melted or has been removed from the exhaust system.)
• Knocking Noise
• May Cause Engine Damage
Dealerships should remind their customers that engine concerns due to non-GM calibrations (Power-Up Kit) will not be covered under the GM warranty.
If a customer vehicle comes in to your dealership with possible symptoms from a Power-Up Kit, the dealership technician may now read the last engine calibration part numbers and CVN history using a Tech 2 ®.
The dealership technician would input each ECM calibration part number into the SPS/TIS2WEB CVN database to confirm the CVN history information. Refer to Tech♦2 path table in this bulletin to verify ECM calibration.
Tech♦2 Powertrain Output Controls Path Table for NON-GM ECM Calibration
1. Build the vehicle with the Tech 2.
2. Select F0: Engine Control Module.
3. Select F5: Module Identification Information.
4. Select F1: Programming History.
5. Turn Ignition On and Engine Off. Press ENTER Key to Continue.
6. Record the Calibration I.D. Numbers and Verification Numbers from the Tech 2 Programming History Screen.
7. From SPS/TIS2WEB, record the Calibration Part Number into the CVN Database. Get CVN.
• If the CVN does not match the CVN database, an unauthorized engine calibration part was flash programmed into the ECM.
• If the CVN matches the CVN database, we can assume a Power-Up Kit that flash programs engine calibrations was not used.
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Message #: VSS20081381
Date Released: 01/29/2008
Recommended Distribution: Service Manager; Warranty Administrator
Dealership Contact: Powertrain Brand Quality

 

You have to pay to play...

 

Bummer.......probably will only get worse, too.

Thanks for the info.

 

We all knew it was coming one day, just didnt want it to be this soon.

 

Give it time, they'll get around this too.

In '96, when OBD II came out, they said it could not be tampered with That didn't last long. The programmers will just have to get smarter with their programming. Give it time, they'll do it....if it hasn't been done already.

 

I have been saying that for years. I have never taken a programmer out when I take my truck into the dealership.

 

Well that sucks. Some dealers are better than others when it comes to warranty work.

 

Some dealers sell them, my buddy in NC almost bought a hypertech at the parts counter of the dealership.

 

Or this will simply drive up the demand for spare computers to swap into the trucks.

 

ha ha then im screwed this thing has thrown codes left and right, on day i had to leave it plugged in and keep clearin em so i could go some were , took the dpf of too, talk about run and smoke , but put it back on and gave the truk to the wife, me and chevrolets just dont get along