Customer Satisfaction - Transmission Software and Calibration Update

Certain 2008 model year Buick Enclave; GMC Acadia; and Saturn Outlook model vehicles may have customer complaints about drivability, particularly hesitation and shift busyness.

Dealers/Retailers are to reprogram the engine and transmission control modules.

Involved are certain 2008 Buick Enclave; GMC Acadia; and Saturn Outlook model vehicles built within these VIN breakpoints:

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

For dealers/retailers 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/retailers will not have a report available if they have no involved vehicles currently assigned.

-- US GM - GM DealerWorld Recall Information

-- Canadian GM/Saturn dealers/retailers - GMinfoNet Recall Reports

-- US Saturn retailers - Facility VIN List (included with bulletin in GM DealerWorld)

-- 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 a Techline Tech 2® scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update. Use data version 8.5 for 2007 or later, available on TIS 2 Web 08/19/07; and on TIS DVD version 9.0/ 2007 or later, mailed to dealers beginning 09/12/07. If you cannot access the calibration, call the Techline Customer Support Center.

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 Service Programming System (SPS) application 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 that there is a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during programming. Use an additional jump battery if necessary. Only use approved Midtronics charger or Jumper Packs, etc. to maintain proper battery voltage during programming.
2. Reprogram the Engine Control Module (ECM) then the Transmission Control Module (TCM) under Programming Sequence ECM/TCM . Refer to SI and Service Programming System (SPS) documentation for ECM and TCM programming instructions, if required.

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. GM Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines. Saturn US retailers should refer to GM messenger bulletins SAG20060292/SAG20060295 for Courtesy Transportation guidelines. Saturn Canada retailers should refer to applicable Home Office letter on this subject.

Submit a Product Claim with the information indicated below:

1. To receive credit, submit a claim with the information below:

2. Check your Saturn SERVICELINE.XL Claim Memorandum daily. Remember to code the claim as a WC sale type, and VC case type. Contact your field representative if you need assistance.

3. Submit courtesy transportation using normal labor operations for courtesy transportation as indicated in GM messenger bulletins SAG20060292/SAG20060295.

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:

As the owner of a 2008 model year Buick Enclave, GMC Acadia or Saturn Outlook, your satisfaction is very important to us. This letter is to make you aware of an engine and transmission computer software update that is being made available to you for improved performance.

Your vehicle is equipped with a state-of-the-art 6-speed automatic transmission which utilizes the latest computer technology to control shift performance and allow for easy software updates.

The update that is being made available to you is voluntary and enhances shifting performance. That means you should expect smoother, more responsive shifts with this software update. The update requires no hardware changes and is NO cost to you.

After the software update is performed, your vehicle may take a couple of weeks to re-learn your driving habits. During this time your fuel economy may vary from what you previously experienced.

Important: It is not necessary to take your vehicle to your dealer as a result of this letter unless you desire to take advantage of the software update. If you choose to do so, we recommend that you contact your dealer to schedule an appointment and confirm the time required to process your vehicle in their service department.

We have taken this action in the interest of your continued satisfaction with our products. If you have any questions or need any assistance, just contact your dealer/retailer 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.

Please keep this letter with your other important glove box literature for future reference.

Scott Lawson

General Director,

Customer and Relationship Services

Enclosure

07217