01M 321 432A – Transmission Fluid Fill Plug

Description

The transmission fluid fill plug seals the filler opening on compatible 01M four-speed automatic transmissions. This OE-style, single-use plug closes the transmission fill port after fluid-level service, helping maintain the sealed fluid circuit required for proper automatic-transmission operation.

Replace the plug whenever it is removed during fluid service. Its one-time-use design ensures the correct sealing condition at the fill opening after installation.

Why the Transmission Fluid Fill Plug Matters

Automatic transmissions depend on the correct fluid quantity and a properly sealed case. A damaged, reused, or incorrectly installed fill plug can allow fluid loss or contamination at the filler opening. Even a small transmission-fluid loss can affect hydraulic pressure, shift quality, and internal component lubrication.

Installing a new transmission fluid fill plug during service supports a secure filler-port seal and helps preserve the transmission’s specified fluid level.

Signs Your Transmission Fluid Fill Plug Needs Replacing

Replace the plug whenever it has been removed. Inspect the filler area if you notice:

• Fluid residue around the transmission filler opening.

• Transmission fluid dripping after a fluid service.

• A damaged plug head, threads, or sealing surface.

• An improperly seated or missing filler plug.

• Evidence that the existing plug has been previously reused.

Key Features of the Transmission Fluid Fill Plug

• OE Part Number: 01M 321 432 A

• Function: Seals the automatic-transmission fluid filler opening.

• Application: Compatible with select 01M four-speed automatic transmissions.

• Single-Use Design: Replace after removal during transmission fluid service.

• OE-Style Fit: Designed for correct installation at the transmission fill port.

• Service Essential: Helps complete automatic-transmission fluid-level service correctly.

Service Notes

The transmission fluid fill plug is a one-time-use service part. Do not reinstall a removed plug. Before fitting the new plug, clean the filler-port threads and surrounding area to prevent debris from entering the transmission.

Use only the correct manufacturer-specified automatic-transmission fluid. Set the fluid level following the required temperature-based procedure, as an incorrect level can cause shift concerns or transmission damage. Install the new plug to the applicable factory torque specification after confirming the proper fluid level.

Compatibility & Applications

Always verify fitment by VIN before ordering.

Cross Reference Numbers

• 01M 321 432 A

• 01M321432A

Additional information