Customer Satisfaction - ECM EEPROM - Reprogram ECM

All 2007 and certain 2008 Chevrolet Silverado, Express; GMC Sierra and Savana vehicles, equipped with a 6.6L Duramax Diesel V8 (RPO LMM - VIN 6) engine, were produced with an ECM programming error that can result in incorrect data being written to the EEPROM used by the vehicle theft deterrent system, causing the engine not to crank or start.

Dealers are to reprogram the ECM with revised software that corrects the programming error.

Involved are all 2007 and certain 2008 Chevrolet Silverado, Express; GMC Sierra and Savana vehicles, equipped with a 6.6L Duramax Diesel V8 (RPO LMM - VIN 6) engine and built within these VIN breakpoints:

Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the system below. Not all vehicles within the above breakpoints may be involved.

For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided through the applicable system listed below. Dealers will not have a report available if they have no involved vehicles currently assigned.

- US GM dealers - GM DealerWorld Recall Information

- Canadian GM dealers - GMinfoNet Recall Reports

- Export dealers - sent directly to dealers

The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program.

Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control modules via an MDI and Techline Tech 2® scan tool and TIS 2 WEB website with the following calibration updates:

2007-08 Chevrolet Silverado, Express; GMC Sierra, Savana: Use data version 5.5 for 2008 as of 05/12/08 or later, available on TIS 2 WEB; and on TIS DVD version 6.0 / 2008 or later, mailed to dealers beginning 06/04/08.

If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.

Program Engine Control Module

Important: Verify that the 12 volt battery has a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during programming. Only use approved Midtronics 165-PCS charger or equivalent to maintain proper battery voltage during programming.

1. Refer to Service Programming System (SPS) in SI for programming procedures.
2. Program the ECM with the latest calibration. This calibration, or any that follow, is designed to address VTD concerns. As always, make sure your Tech 2® is updated with the latest software version.
3. Select the J2534 MDI and Reprogram the ECU from the Select Diagnostic Tool and Programming Process screen. The J2534 MDI will reprogram the modules in less time than the Tech 2® scan tool.

One or more of the DTCs listed in the table below will be set in the event that a vehicle is currently experiencing this condition. Do not replace the ECM. Additional steps may also be required to properly complete the service procedure, as listed in the table below.

The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. GM dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines.

Submit a Product Claim with the information indicated below:

Refer to the General Motors WINS Claims Processing Manual for details on Product Recall Claim Submission.

General Motors will notify customers of this program on their vehicle (see copy of customer letter included with this bulletin).

Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the attached sample letter.

All unsold new vehicles in dealers' possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles.

Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.

Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.

In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle.

Dear General Motors Customer:

We have learned that your 2007-08 model year Chevrolet Silverado, Express; GMC Sierra or Savana vehicle, equipped with a 6.6L Duramax Diesel V8 engine, was produced with a programming error that can result in Engine Control Module memory damage and will cause the engine not to crank or start. This is more likely to occur the longer you operate your vehicle.

Your satisfaction with your Chevrolet Silverado, Express; GMC Sierra or Savana is very important to us, so we are announcing a program to prevent this condition or, if it has occurred, to fix it.

What We Will Do: To prevent this condition from occurring, your GM dealer will reprogram the Engine Control Module (ECM) with revised software that corrects the programming error. This service will be performed for you at no charge .

What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as possible to schedule an appointment for this repair.

Customer Reply Form: The enclosed customer reply form identifies your vehicle. Presentation of this form to your dealer will assist in making the necessary correction in the shortest possible time. If you no longer own this vehicle, please let us know by completing the form and mailing it back to us.

If you have any questions or need any assistance, please contact your dealer or the appropriate Customer Assistance Center at the number listed below.

Courtesy Transportation: If your vehicle is within the New Vehicle Limited Warranties your dealer may provide you with shuttle service or some other form of courtesy transportation while your vehicle is at the dealership for this repair. Please refer to your Owner’s Manual and your dealer for details on Courtesy Transportation.

We sincerely regret any inconvenience or concern that this situation may cause you. We want you to know that we will do our best, throughout your ownership experience, to ensure that your GM vehicle provides you many miles of enjoyable driving.

Scott Lawson

General Director,

Customer and Relationship Services

Enclosure

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