GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Important: Transmission fluid may turn dark with normal use and does not always indicate contamination or oxidation.

Check the fluid color.

Is the fluid color red?

--

Go to Step 4

Go to Step 2

2

Check the fluid color.

Is the fluid color a non-transparent pink?

--

Go to Step 13

Go to Step 3

3

Check the fluid color.

Is the fluid color light brown?

--

Go to Step 18

--

4

Check the fluid level.

Is the fluid level high?

--

Go to Step 8

Go to Step 5

5

Check the fluid level.

Is the fluid level OK?

--

Go to Step 20

Go to Step 6

6

Check the fluid level.

Is the fluid level low?

--

Go to Step 9

Go to Step 7

7

Check the fluid level.

Does the fluid have foam?

--

Go to Step 12

Go to Step 13

8

Remove excess fluid.

Did you remove the excess fluid?

--

Go to Step 20

--

9

Add fluid in order to obtain the proper level.

Did you add fluid to the proper level?

--

Go to Step 10

--

10

Inspect for external leaks.

Are there any external leaks?

--

Go to Step 11

--

11

Repair the leak.

Did you repair the leak?

--

Go to Step 20

--

12

Inspect for a high fluid level.

Is the fluid level high?

--

Go to Step 8

Go to Step 13

13

Check for contaminants in the fluid.

Are there contaminants in the fluid?

--

Go to Step 14

--

14

Drain the fluid in order to determine the source of contamination.

Did you drain the fluid?

--

Go to Step 15

--

15

Perform a transmission overhaul.

Did you perform the procedure?

--

Go to Step 16

--

16

Add new fluid.

Did you add new fluid?

--

Go to Step 17

--

17

Check the fluid level.

Did you check the fluid level?

--

Go to Step 20

--

18

Important: A very small amount of material in the bottom pan is a normal condition.

Drain the fluid in order to determine if there is contamination.

Are there large pieces of metal or other material in the bottom of the pan?

--

Go to Step 15

Go to Step 19

19

Change the fluid and filter.

Did you change the fluid and filter?

--

Go to Step 20

--

20

Perform the road test.

Did you perform the test?

--

System OK

--