GM Service Manual Online
For 1990-2009 cars only

Step

Action

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

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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

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9

Add fluid in order to obtain the proper level.

Did you add fluid to the proper level?

Go to Step 10

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10

Inspect for external leaks.

Are there any external leaks?

Go to Step 11

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11

Repair the leak.

Did you repair the leak?

Go to Step 20

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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

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14

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

Did you drain the fluid?

Go to Step 15

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15

Perform a transmission overhaul.

Did you perform the procedure?

Go to Step 16

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16

Add new fluid.

Did you add new fluid?

Go to Step 17

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17

Check the fluid level.

Did you check the fluid level?

Go to Step 20

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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

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20

Perform the road test.

Did you perform the test?

System OK

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