A/T - 4T80-E Buzz in Reverse Cold, On Decel/3-2 Shift
Bulletin No.: 05-07-30-029Date: 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.
3. Inspect the appropriate accumulator retaining rings/clips (349).
4. If an accumulator ring/clip (349) is found loose, missing, damaged, etc., thoroughly inspect the accumulator and replace as necessary.
5. Replace the appropriate accumulator ring/clip (349), P/N 9413349, following the procedures in SI.
Parts Information
Warranty Information
Important:
ONLY use the applicable labor code listed below.
For vehicles repaired under warranty, use the table.
Disclaimer