Envoy 4WD V8-5.3L VIN P (2004)
Control Module: All Technical Service Bulletins
AWD/4WD System - Delayed Front Wheel Engagement
Bulletin No.: 04-04-21-001
Date: May 14, 2004
TECHNICAL
Subject:
Delayed Engagement of Front Wheels During a Slip Condition (Reprogram Transfer Case Control Module (TCCM))
Models:
2004 Buick Rainier
2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT
2002-2004 GMC Envoy, Envoy XL
2004 GMC Envoy XUV
2002-2004 Oldsmobile Bravada
with New Venture Gear (NVG) 126 (RPO NP4) or NVG 226 (RPO NP8) Transfer Case
Condition
Some customers may comment on a hesitation or delayed engagement of the front wheels during a slip condition.
This condition may manifest itself in the normal AWD mode for the Bravada and Rainier models, and in the Auto 4WD mode for the TrailBlazer and
Envoy models.
Correction
Reprogram the Transfer Case Control Module (TCCM) using normal SPS procedures using TIS software version 11.5 released November 10th, 2003 or
newer. Refer to Transfer Case Control Module Reprogramming for additional information.
2002 vehicles will require the replacement of the transfer case control module prior to reprogramming.
Warranty Information
For vehicles repaired under warranty, use the table shown.
Disclaimer
