Product Emission - Evaporative Emission System Diagnostic Disabled by Incorrect Fuel Level Reference - Reprogram PCM

General Motors has decided to conduct a Voluntary Emission Recall involving certain 2003 Chevrolet Silverado, Express; GMC Sierra, Savana model vehicles equipped with 6.0L (RPO LQ4 - VIN Code U) Compressed Natural Gas (RPO KL6) V8 engine. These vehicles could have the .020" Engine Off Natural Vacuum (EONV) evaporative emission system leak detection diagnostic disabled by the Powertrain Control Module (PCM) that incorrectly references a full or empty fuel tank.

Dealers are to reprogram the Powertrain Control Module (PCM).

Involved are the following 2003 Chevrolet Silverado, Express; GMC Sierra, Savana model vehicles equipped with the 6.0L (RPO LQ4 - VIN Code U) Compressed Natural Gas (RPO KL6) V8 engine; and listed by the Delivery Dealer Business Associate Code (BAC) and Vehicle Identification Number (VIN).

Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) prior to beginning recall repairs. [Not all vehicles within the above breakpoints may be involved]

For dealers with involved vehicles, a Campaign Initiation Detail Report containing the complete Vehicle Identification Number, customer name and address data has been prepared and will be loaded to the GM DealerWorld, Recall Information website. The customer name and address data furnished will enable dealers to follow up with customers involved in this program.

The Campaign Initiation Detail Report may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose 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.

The service calibration is included in the Techline Information System (TIS) data version 4.0, scheduled for broadcasting to dealers via GM Access on April 3, 2004; and on TIS CD-ROM version 4, scheduled for mailing to dealers on April 12, 2004.

1. Prep the vehicle for Powertrain Control Module (PCM) reprogramming.
2. Program the PCM using TIS data version 4.0, scheduled for broadcasting to dealers via GM Access on April 3, 2004, or TIS CD-ROM version 4, scheduled for mailing to dealers on April 12, 2004. Refer to up-to-date Techline equipment user instructions.
3. Install a Recall Identification Label. Also, for California vehicles complete a "Proof Of Correction" certificate upon recall completion.

Place a Recall Identification Label on each vehicle corrected in accordance with the instructions outlined in this Product Recall Bulletin. Each label provides a space to include the recall number and the five-digit dealer code of the dealer performing the recall service. This information may be inserted with a typewriter or a ballpoint pen.

Put the Recall Identification Label on a clean and dry surface of the radiator core support in an area that will be visible to people servicing the vehicle.

When installing the Recall Identification Label, be sure to pull the tab to allow the adhesion of the clear protective covering. Additional Recall Identification Labels for US dealers can be obtained from Dealer Support Materials by either ordering on the web from DWD Store, gm-dealerworld.com, or by calling 1-866-700-0001 (Monday-Friday, 8:00 am to 5:00 pm EST). Request Item Number S-1015 when ordering.

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 recall 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 Recall Claim with the information indicated below.

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

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

In order to ensure full protection under the emission warranty, and the right to participate in future recalls, the customer notification letter recommends that customers have their vehicles serviced as soon as possible. It also advises that failure to do so could legally be determined to be lack of proper maintenance. The vehicle may fail a state or local emission inspection test if the recall work is not completed.

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

Dealers are to service all vehicles subject to this recall 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. This could be done by mailing to such customers a copy of the customer letter accompanying this bulletin. Recall 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 recall enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the recall correction has been made before selling or releasing the vehicle.

When a California emissions recall is completed by a GM dealer, the dealer must provide the vehicle owner a "Proof Of Correction Certificate" which the owner may need to present to the California Department Of Motor Vehicles (DMV) when renewing their vehicle registration. Without this correction certificate, the owner may be unable to renew their vehicle registration.

Additional Certificates can be obtained, at no charge, from Dealer Support Materials by calling 1-866-700-0001 (Monday through Friday, 8:00 am to 5:00 pm EST). Ask for GM Item Number 1825 when ordering.

Dear General Motors Customer:

This notice is sent to inform you that General Motors is conducting a voluntary emission recall that includes your vehicle.

Your 2003 Chevrolet Silverado, Express; GMC Sierra or Savana model vehicle, equipped with a 6.0L Compressed Natural Gas option V8 engine, could have a portion of the evaporative emission system leak detection diagnostic disabled by the Powertrain Control Module (PCM) that incorrectly references a full or empty fuel tank.

Your dealer will reprogram the Powertrain Control Module (PCM). This service will be performed for you at no charge .

Please contact your <Division> dealer as soon as possible after April 5, 2004 to arrange a service date. Instructions for making this correction have been sent to your dealer. Please ask your dealer if you wish to know how much time will be needed to schedule, process and repair your vehicle.

If you have any questions or need assistance, just contact your dealer or the appropriate Customer Assistance Center at the number listed below. The Customer Assistance Center hours of operation are 8:00 AM - 11:00 PM Eastern Standard Time, Monday through Friday.

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 your vehicle is within the New Vehicle Limited Warranty, your dealer will 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.

In order to ensure your full protection under the emission warranty made applicable to your vehicle by State or Federal Law, and your right to participate in future recalls, it is recommended that you have your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection if this recall is not accomplished.

The California Air Resources Board (CARB) requires vehicle emission recalls be completed prior to California registration renewal. Uncorrected emission recalls will result in the inability to renew your California vehicle registration.

At the time of emission recall completion, your California dealer will issue a "Proof Of Correction Certificate". Keep this certificate and, if required, present it to the Department of Motor Vehicles when renewing your California registration as proof of recall completion.

More information about this recall (including frequently asked questions) is available online at the Owner Center at My GMLink. This free online service offers vehicle and ownership-related information and tools tailored to your specific vehicle. To join, visit www.mygmlink.com and enter your vehicle's 17-digit vehicle identification number, shown on the enclosed customer reply form, to get the most personalized information for your vehicle.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

<Divisions>

General Motors Corporation

Enclosure

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