For 1990-2009 cars

# Information on Normal Maintenance or Warranty Service for MN4, MN5, ME7 Automatic Transmission Oil Pan Magnet Upgrade

Subject: | Information on Normal Maintenance or Warranty Service for MN4, MN5, ME7 Automatic Transmission Oil Pan Magnet Upgrade

Models: | 2001-2005 Chevrolet Cavalier

| 2001-2008 Chevrolet Malibu, Malibu Classic, Malibu Maxx, Malibu Hybrid

| 2006-2008 Chevrolet Cobalt, HHR, HHR SS

| 2001-2004 Oldsmobile Alero

| 2001-2005 Pontiac Grand Am, Sunfire, Pursuit (Canada Only)

| 2005-2008 Pontiac G5, G6

| with 4T40-E or 4T45-E HYDRA-MATIC® Automatic Transmission (RPOs MN4, MN5, ME7)

Attention: | Do not remove the transmission oil pan unless normal maintenance or diagnosis of a customer concern requires it.

This bulletin is being revised to update the transmission RPO list. RPO MN7 was removed and replaced with RPO ME7. Please discard Corporate Bulletin Number 08-07-30-040 (Section 07 -- Transmission/Transaxle).

A new transmission oil pan magnet, P/N 29535617, was released for service. The current square transmission oil pan magnet may become saturated with normal ferrous sediment and the Pressure Control Solenoid (PCS) is now collecting ferrous sediment, making it vary from design. For a given current the PCS electromagnet is stronger, causing the line pressure to be less than needed.

When checking PCS line pressure (refer to Line Pressure Check in SI) and it shows that the line pressure is lower than required (refer to Current-Amps/Line Pressure Chart in SI), for a given current at the PCS or the transmission oil pan was removed (for either normal maintenance or warranty service), only then should the transmission oil pan magnet be upgraded.

Install two new transmission oil pan magnets, P/N 29535617, as shown in the illustration.

1. Remove and discard the original square transmission oil pan magnet and install a new one in the current location (remains unchanged) (2).
2. Install the second new transmission oil pan magnet in the following location (1) as shown in the illustration.

### Parts Information

Part Number | Description | Qty
--- | --- | ---
29535617 | Magnet, Transmission Oil Pan | 2

### Warranty Information

For vehicles repaired under warranty, use:

Labor Operation | Description | Labor Time
--- | --- | ---
K9523* | Installation of Two Magnets to Transmission Oil Pan | 0.3 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.