Recall - ABS Front Axle Signal Malfunction: Overview
File in: ProductSection: Campaigns
Bulletin No: 99041
Dates: May, 2000
SUBJECT:
99041 - INCORRECT FRONT AXLE STATUS SIGNAL TO EBC4 ABS
MODELS:
1991-1996 CHEVROLET AND GMC 4WD T UTILITIES
1994-1996 CHEVROLET AND GMC 4WD T PICKUP TRUCKS
DUE TO THE AVAILABILITY OF PARTS, THIS CAMPAIGN WILL BE ADMINISTERED IN PHASES. YOU WILL RECEIVE A DEALER LISTING AS PHASES ARE RELEASED.
CONDITION
General Motors has decided that a defect which relates to motor vehicle safety exists in certain 1991-1996 Chevrolet and GMC 4WD T utilities and 1994-1996 Chevrolet and GMC 4WD T pickup trucks. Some of these vehicles exhibit a condition in which a switch that signals the antilock brake system (ABS) module when the vehicle is in four-wheel drive (4WD) may malfunction. The ABS module is designed with two different operating algorithms; one for two-wheel drive (2WD) operation and another for 4WD drive operation. This allows the ABS system to compensate for the braking torque applied tot he rear wheels through the drivetrain when the vehicle is in 4WD drive. When the vehicle is in 2WD, a malfunctioning switch may send an incorrect signal tot he ABS module. If this occurs during an ABS stop, a somewhat longer stopping distance could result. If this occurred when minimum stopping distance was required, it could result a vehicle crash.
CORRECTION
Dealers are to install a new transfer case selector switch, wiring harness, and an additional switch to ensure that the ABS receives the 4WD signal only when the drivetrain is in 4WD.
VEHICLES INVOLVED
Involved are certain 1991-1996 Chevrolet and GMC 4WD T utilities and 1994-1996 Chevrolet and GMC 4WD T pickup truck built within these VIN breakpoints as shown.
IMPORTANT
Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) or GM Access Screen (Canada only) or DCS Screen 445 (IPC only) before beginning campaign repairs. [Not all vehicles within the above breakpoints may be involved.]
Involved vehicles have been identified by Vehicle Identification Number. Computer listing containing the complete Vehicle Identification, customer name address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name address data furnished will enable dealers to follow up with the campaign bulletin has no involved vehicles currently assigned.
These dealer listings 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 listing to the follow-up necessary to complete this campaign.
PARTS INFORMATION
Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" before ordering parts. Normal orders should be placed on a DRO = Daily Replenishment Order, in an emergency situation, parts should be ordered on a CSO = Customer Special Order.
Part Number Description Quantity/Vehicle
88880028 Switch Kit, Elek Brk Cont Frt 1
Drv Axle Vac (1991-94 Utility)
88880029 Switch Kit, Elek Brk Cont Frt 1
Drv Axle Vac (1995-96 Utility, 1994-96 Pickup)
CAMPAIGN IDENTIFICATION LABEL - For US IPC
Place a Campaign Identification Label on each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin. 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 a ball point pen.
CAMPAIGN IDENTIFICATION LABEL - For CANADA
Place a Campaign Identification Label on each vehicle corrected in accordance with the instruction outlined in this Product Campaign Bulletin. 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.
CLAIM INFORMATION
Submit a Product Campaign Claim with the information indicated.
Refer to the General Motors WINS claims processing Manual for details on Product Campaign Claim Submission.
CUSTOMER NOTIFICATION - For US and CANADA
Customers will be notified of this campaign on their vehicles by General Motors (see copy of customer letter included with this bulletin.
CUSTOMER NOTIFICATION - For IPC
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 suggested dealer letter.
DEALER CAMPAIGN RESPONSIBILITY - For US and IPC (US States, Territories, and Possessions)
The US National Traffic end Motor Vehicle safety Act provides that each vehicle that is subject to recall campaign of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall campaign notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the campaign is not completed within a reasonable time.
DEALER CAMPAIGN RESPONSIBILITY - ALL
All unsold new vehicle in dealers' possession and subject to this campaign must be held an 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 customer letter accompanying this bulletin. Campaign 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 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.
Disclaimer