TrailBlazer 4WD L6-4.2L VIN S (2002)
Technical Service Bulletin # 01064
Date: 011001
Recall - Transfer Case/Control Module Check & Reprogram
File In Section: Product Recalls
Bulletin No.: 01064
Date: October, 2001
PRODUCT SAFETY RECALL
SUBJECT:
01064 - TRANSMISSION TRANSFER CASE - INSPECT/REPROGRAM
MODELS:
CERTAIN 2002 4WD CHEVROLET TRAILBLAZER AND GMC ENVOY
CONDITION
General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2002 Chevrolet TrailBlazer and GMC Envoy model
vehicles equipped with four wheel drive. The calibration of the active transfer case control module or a range shift collar that was not machined properly
may cause insufficient high speed gear engagement. If the gear is not engaged, the vehicle can roll when the transmission is in "park" and a crash could
result without warning. A ratcheting noise when the vehicle is in reverse gear or when the driver releases the accelerator pedal while the vehicle is in a
drive gear, is a symptom of insufficient gear engagement.
CORRECTION
Dealers are to perform a "clean neutral" test, as described in this bulletin, to detect vehicles with range shift collars that were not machined properly. If a
ratcheting noise is detected during the test, dealers are to replace the transfer case. Less than 1% of the tested vehicles will require a transfer case
replacement. Dealers are to update the active transfer case control module (ATCM) calibration on all vehicles in order to increase gear engagement.
VEHICLES INVOLVED
Involved are certain 2002 4WD Chevrolet TrailBlazer and GMC Envoy model vehicles equipped with a transmission transfer case and built within the
VIN breakpoints 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 listings containing the complete Vehicle Identification Number,
customer name and address data have been prepared, and are being furnished to involved dealers with the recall bulletin. The customer name and address
data furnished will enable dealers to follow up with customers involved in this recall. Any dealer not receiving a computer listing with the recall 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 recall.
PARTS INFORMATION
