POWERTRAIN CONTROL MODULE (PCM) RESET. GMC Truck Safari

CUSTOMER SATISFACTION CAMPAIGN

SUBJECT: CAMPAIGN 96073 - POWERTRAIN CONTROL MODULE (PCM) RESET ------------------------------------------------------

MODELS: 1993-1994-1995 M/L VANS WITH 4.3L (RPO L35 - VIN W) --------------------------------------------------

(CANADA ONLY)

DEFECT INVOLVED

General Motors of Canada Limited has decided that certain 1993-1994-1995 M/L model vehicles equipped with 4.3L engines (RPO L35) may exhibit a condition in ambient temperatures below -10 degrees C in which a high frequency transient voltage spike back-feeds into the powertrain control module (PCM) and causes it to reset. In some cases, a reset may lead to an incorrect fuel/spark calibration run mode which is associated with complaints of low engine power until the engine is stopped and restarted, or engine stalling.

To prevent the possibility of this condition occurring, dealers are to replace the existing Memcal with a new Memcal.

VEHICLES INVOLVED

Involved are certain 1993-1994-1995 M/L model vehicles equipped with 4.3L engines (RPO L35 - VIN Code W) and built within the following VIN breakpoints:

PLANT YEAR DIVISION MODEL PLANT CODE FROM THROUGH ---- --------- ----- --------- ----- -------- -------- 1993 Chevrolet M/L Baltimore "B" PB100141 PB225154 1994 Chevrolet M/L Baltimore "B" RB100187 RB248947 1995 Chevrolet M/L Baltimore "B" SB100033 SB274034 1993 GMC M/L Baltimore "B" PB500034 PB552942 1994 GMC M/L Baltimore "B" RB500060 RB558675 1995 GMC M/L Baltimore "B" SB500023 SB566579

NOTE: PLEASE CHECK DCS SCREEN 445 OR YOUR V.I.N. LISTING BEFORE PERFORMING CAMPAIGN TO ENSURE THAT THE VEHICLE IS AFFECTED. ONLY AFFECTED VIN'S WILL BE PAID.

Involved vehicles have been identified by Vehicle Identification Number. Computer listings containing the complete Vehicle Identification Number, customer name and address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name and address data furnished will enable dealers to follow-up with customers involved in this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

PARTS INFORMATION

Notice: An initial supply of parts required to complete this campaign will be pre-shipped to involved dealers of record. This pre-shipment will occur the week of December 16, 1996. Parts received for a recently transferred vehicle should be forwarded by the original dealer (with a phone call) to the dealer that received the transferred vehicle. Pre-shipped parts will be charged to dealer's open parts account.

Additional parts, if required, are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" prior to ordering requirements.

Quantity/ Part Number Description Vehicle ----------- ------------------------------------------ --------- 16239362 Memcal - 1993 M Van (Broadcast Code BUZJ) 1 16239347 Memcal - 1993 L Van (Broadcast Code BUZH) 1 16239423 Memcal - 1994 M Van (Broadcast Code BUZY) 1 16239410 Memcal - 1994 L Van (Broadcast Code BUZU) 1 16239462 Memcal - 1995 M Van (Broadcast Code BWAJ) 1 16239459 Memcal - 1995 L Van (Broadcgt C-ode BWAH) 1

CUSTOMER NOTIFICATION

All customers of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors (see copy of customer letter included with this bulletin). The listings provided are for campaign activity only and should not be used for any other purpose.

DEALER CAMPAIGN RESPONSIBILITY

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

Dealers are to service all vehicles subject to this campaign 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 appropriate customer letter accompanying this bulletin.

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

SERVICE PROCEDURE

1. Replace the Memcal with appropriate part number (see "PARTS INFORMATION").

NOTICE: The service Memcal is common for other driveability concerns and may already be in the vehicle. A new Memcal is not required if already equipped with the new part number from the "PARTS INFORMATION" table.

2. Install Campaign Identification Label.

CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the campaign number and the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or a ball point pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought into the dealership for periodic servicing. Additional Campaign Identification Labels can be obtained from DGN by calling 1-800-668-5539 (Monday-Friday, 8:00 a.m. to 5:00 p.m. EST). Ask for Item Number GMP 91 when ordering.

Apply the "Campaign Identification Label" only on a clean, dry surface.

CLAIM INFORMATION

Submit a Product Campaign Claim with the information indicated below:

* REPAIR PERFORMED PART FAILED PARTS LABOUR LABOUR COUNT PART NO. ALLOW CC-FC 0P HOURS ---------------- ----- ------- ----- ----- ------ ------- Replace Memcal 1 - ** MA-96 V9986 0.3

* For Campaign Administrative Allowance, add 0. I hours to the "Labour Hours".

** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 40% for the 1994 and 1995 Memcals and 30% for the 1993 Memcals needed to complete the repair.

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

December 1996

Dear General Motors Customer:

General Motors of Canada Limited has decided that certain 1993, 1994 and 1995 M/L Vans equipped with 4.3L engines (RPO L35) may exhibit a condition in ambient temperatures below -10 degrees C in which a high frequency transient voltage spike back-feeds into the powertrain control module (PCM) and causes it to reset. In some cases, a reset may lead to an incorrect fuel/spark calibration run mode which is associated with complaints of low engine power until the engine is stopped and restarted, or engine stalling.

To prevent the possibility of this condition occurring, your GM dealer will replace the existing Memcal with a new Memcal.

This service will be provided for you at no charge.

Please contact your GM dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

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

Customer Support Department General Motors of Canada Limited

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.