Bonneville V6-3800 3.8L VIN L SFI (1995)
Accumulator: Customer Interest
A/T - 4T80-E Buzz in Reverse Cold, On Decel/3-2 Shift
Bulletin No.: 05-07-30-029
Date: October 26, 2005
TECHNICAL
Subject:
4T80-E Automatic Transaxle Buzz Noise In Reverse Cold and/or Deceleration and/or 3-2 Downshift (Inspect/Replace Accumulator Retaining
Ring/Clip)
Models:
2002 and Prior Cadillac Eldorado
2005 and Prior Cadillac DeVille
2003 and Prior Oldsmobile Aurora
2005 and Prior Pontiac Bonneville
with 4T80-E Automatic Transaxle (RPO MH1)
Condition
Some customers may comment on a buzz noise from the engine compartment area in reverse when the vehicle is cold and/or during deceleration, usually
during a 3-2 downshift.
Cause
It is possible that an accumulator ring (retaining clip) (349) maybe dislodged, broken, missing and/or cracked.
Correction
1.
Using chassis ears, or the equivalent, determine if the noise source is in the side cover or the lower pan.
2.
Remove the appropriate cover following the procedures in SI.
