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.

Inspect the fluid color.

Is the fluid color red?

--

Go to Step 4

Go to Step 2

2

Inspect the fluid color.

Is the fluid color pink, and not transparent?

--

Go to Step 13

Go to Step 3

3

Inspect the fluid color.

Is the fluid color light brown?

--

Go to Step 18

--

4

Inspect the fluid.

Is the fluid foamy?

--

Go to Step 12

Go to Step 5

5

Inspect the fluid level.

Is the fluid level high?

--

Go to Step 8

Go to Step 6

6

Inspect the fluid level.

Is the fluid level low?

--

Go to Step 9

Go to Step 7

7

Confirm that the fluid level is OK.

Is the fluid inspection complete?

--

Go to Step 20

--

8

Remove excess fluid.

Is the action complete?

--

Go to Step 20

--

9

Add fluid in order to obtain the proper level.

Is the action complete?

--

Go to Step 10

--

10

Inspect for external leaks. Refer to Fluid Leak Diagnosis and Repair .

Is the action complete?

--

Go to Step 11

--

11

Repair the leak.

Is the action complete?

--

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

Test for contaminants in the fluid.

Is the action complete?

--

Go to Step 14

--

14

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

Is the action complete?

--

Go to Step 15

--

15

Perform a transmission overhaul.

Is the action complete?

--

Go to Step 16

--

16

Add new fluid.

Is the action complete?

--

Go to Step 17

--

17

Inspect the fluid level.

Is the action complete?

--

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 of other material in the bottom of the pan?

--

Go to Step 15

Go to Step 19

19

Change the fluid and the filter.

Is the action complete?

--

Go to Step 20

--

20

Perform the road test. Refer to Road Test .

Is the action complete?

--

System OK

--