Customer Satisfaction-Water in Fuel Light Inoperative-Reprogram Engine Control Module (ECM)

THIS RECALL IS IN EFFECT UNTIL MAY 31, 2007.

Certain 2006 Chevrolet Express and GMC Savana model vehicles, equipped with a 6.6L V8 (RPO LLY - VIN 2) Duramax Diesel engine, may have been built with a condition in which the "Water in Fuel" Light may be inoperative because of an error in the Engine Control Module (ECM) calibration. The purpose of the light is to alert the driver when water is detected in diesel fuel so that prompt action can be taken to help avoid engine damage.

Important: This program will expire on May 31, 2007.

Dealers are to reprogram the Engine Control Module (ECM).

Involved are certain 2006 Chevrolet Express and GMC Savana model vehicles, equipped with a 6.6L V8 (RPO LLY - VIN 2) Duramax Diesel engine and built within these VIN breakpoints:

Important: GM Dealers are to confirm vehicle eligibility prior to beginning repairs by using the GM Vehicle Inquiry System (GMVIS). 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 - 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 are programmed into Control Modules via a Techline Tech 2 scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update. Use data version 1.0 for 2006 or later, broadcast to dealers January 8, 2006 (US), January 6, 2006 (Canada); and on TIS CD-ROM version 1.0 / 2006, which was mailed to dealers beginning January 18, 2006. To complete this service procedure, the Tech 2® must also be updated to release 26.004 or greater. If you cannot access the calibration, call the Techline Customer Support Center at 1-800-828-6860 (English) or 1-800-503-3222 (French) and it will be provided.

Tech 2® Remote Programming Method for ECM

Notice: Before reprogramming, please check the battery condition to prevent a reprogramming error of any of the modules due to battery discharge. Battery voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use jumper cables from an additional battery. Be sure to turn off or disable any system that may put a load on the battery, such as automatic headlamps, daytime running lights, interior lights, heating, ventilation, and air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure or control module damage may occur if battery voltage guidelines are not observed.

The ignition switch must be in the proper position. The Tech 2® prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.

Make certain all tool connections are secure, including the following components and circuits:

DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.

DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date.

1. Verify the battery charge of 12 to 16 volts. The battery must be able to maintain the charge during programming. Use an additional jump battery if necessary.
2. Use the normal "request method" through "Service Programming System" to request information from the vehicle.
3. At the Techline Terminal, enter TIS SPS programming system.
4. Select Tech 2® from the "Select Diagnostic Tool" window.
5. Select Reprogram ECU from the "Select Programming Process" window.
6. Select Vehicle from the "Select ECU Location" window.
7. Select Next to go to the "Preparing for Communication" instruction screen.
8. Select Next to view the "Validate Vehicle ID Number" screen. If the vehicle ID number does not appear on the screen, manually insert the VIN into the VIN window of the "Validate Vehicle ID Number" screen.
9. Select Next to view the "Supported Controllers" screen.
10. Select PCM/VCM Powertrain/Vehicle Control Module from "Supported Controllers" window.
11. Select Next to view the "Select Programming Type" window.
12. Select Normal from the "Select Programming Type" window.
13. Select Next to view the "Service Programming System Calibration Selection" screen.
14. Select Next to view "Summary" screen.
15. Verify that current and selected calibration information is displayed on the "Summary" screen.
16. Select Next to download the calibration to the Tech 2®.
17. Back at the vehicle, enter "Service Programming Systems".
18. Select Program ECU and follow the on-screen instructions.
19. When programming is complete, do the following:

19.1.

Turn the Tech 2® OFF.

19.2.

Turn the ignition switch OFF.

20. Wait 30 seconds.
21. Turn the ignition switch to ON with the engine OFF.
22. Go into Diagnostics and check for DTC codes.
23. Clear all codes.

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 Warranty. 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. 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, through May 31, 2007.

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 prior to June 1, 2007, 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:

This notice is sent to inform you that General Motors is conducting a customer satisfaction program that affects certain 2006 Chevrolet Express and GMC Savana model vehicles, equipped with a 6.6L V8 Duramax Diesel engine.

We have learned that your vehicle may have been built with a condition in which the "Water in Fuel" Light may be inoperative because of an error in the Engine Control Module (ECM) calibration. The purpose of the light is to alert the driver when water is detected in diesel fuel so that prompt action can be taken to help avoid engine damage.

To prevent this condition from occurring, your General Motors dealer will reprogram the ECM. This service will be performed for you at no charge until May 31, 2007.

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

: 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, just contact your dealer or the appropriate Customer Assistance Center at the number listed below. The Customer Assistance Center’s hours of operation are from 8:00 AM to 11:00 PM, EST, Monday through Friday.

If your vehicle is within the New Vehicle Limited Warranty 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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