Silverado 3500 2WD V8-6.6L DSL Turbo VIN 2 (2004)
Accumulator: Technical Service Bulletins
A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis
Bulletin No.: 01-07-30-030B
Date: October 18, 2005
INFORMATION
Subject:
4L60-E/4L65-E Automatic Transmission Diagnostic Information on Harsh 1-2 Upshift
Models:
2001-2006 GM Passenger Cars and Light Duty Trucks
2003-2006 HUMMER H2
2006 HUMMER H3
2005-2006 Saab 9-7X
with 4L60-E or 4L65-E Automatic Transmission
Supercede:
This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 01-07-30-030A (Section 07 -
Transmission/Transaxle).
The following four conditions have been found to cause the majority of consistent, harsh 1-2 shift comments.
^
Chips/Sediment/Debris/Contamination found in the valve body, 1-2 accumulator valve (371) bore, may cause the 1-2 accumulator valve to stick or
hang-up.
^
Chips/Sediment/Debris/Contamination found in the valve body, 4-3 sequence valve (383) bore, may cause the 4-3 sequence valve to stick or
hang-up.
