GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

DEFINITION: Transmission oil level low or oil dripping/collecting below vehicle.

1

Check the transmission fluid level. Refer to Transmission Fluid Level Inspection .

Was the transmission fluid level over full?

Go to

Step 2

Go to Step 3

2

Adjust the transmission fluid level as necessary. Refer to Transmission Oil Drain and Fill .

Is there still a oil leak?

--

System OK

3

Inspect the transmission vent tube for a blockage.

Is the transmission vent tube blocked?

Go to Step 4

Go to Step 5

4

Replace the transmission vent tube. Refer to Transmission Vent Tube Replacement .

Is there still a oil leak?

--

System OK

5

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Inspect the transmission seals for wear damage.

Are the seals worn or damaged?

Go to Step 6

--

6

  1. Replace the worn or damaged transmission seals. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.
  2. Install the transmission. Refer to Transmission Replacement .

Is there still a oil leak?

--

System OK