4T80-E Automatic Transaxle Buzz Noise in Reverse Cold and/or Deceleration and/or 3-2 Downshift (Inspect/Replace Accumulator Retaining Ring/Clip). Pontiac Bonneville 2002

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

Using chassis ears, or the equivalent, determine if the noise source is in the side cover or the lower pan.
Remove the appropriate cover following the procedures in SI.

Inspect the appropriate accumulator retaining rings/clips(349).
If an accumulator ring/clip (349) is found loose, missing, damaged, etc., thoroughly inspect the accumulator and replace as necessary.
Replace the appropriate accumulator ring/clip (349), P/N 9413349, following the procedures in SI.

Parts Information

Part Number	Description
9413349	Ring, Accumulator Retaining Clip (349)

Warranty Information

Important: ONLY use the applicable labor code listed below.

For vehicles repaired under warranty, use:

Labor Operation	Description	Labor Time
K6536	Accumulator, Forward - R&R or Replace	Use Published Labor Operation Time
K6675	Accumulator, Reverse - R&R or Replace
K6506	Accumulator, 1-2 - R&R or Replace
K6561	Accumulator, 3-4 - R&R or Replace