GM Service Manual Online
For 1990-2009 cars only

Whine or Growl Noise from the Power Steering System Without Hydraulic Brake Booster

Step

Action

Yes

No

1

Did you review the Power Steering System General Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Power Steering System

2

Verify that a whine or growl noise is present.

Is a whine or growl noise present?

Go to Step 3

System OK

3

Inspect the power steering fluid for the following indications of contamination:

    • Milky fluid - water
    • Brown fluid - burnt
    • Debris in fluid - plastic or dirt

Is the fluid free of contamination?

Go to Step 5

Go to Step 4

4

Flush the power steering system. Refer to Power Steering System Bleeding .

Did you complete the procedure?

Go to Step 11

Go to Step 5

5

Inspect the power steering gear for a whine or growl noise using J 39570 .

Is the noise present at the power steering gear?

Go to Step 8

Go to Step 6

6

Inspect the power steering pump for a whine or growl noise using J 39570 .

Is the noise present at the power steering pump?

Go to Step 9

Go to Step 7

7

Inspect the power steering hoses for a whine or growl noise using J 39570 .

Is the noise present at the power steering hoses?

Go to Step 10

Go to Step 2

8

Replace the power steering gear. Refer to Steering Gear Replacement .

Did you complete the repair?

Go to Step 11

--

9

Replace the power steering pump. Refer to Power Steering Pump Replacement .

Did you complete the repair?

Go to Step 11

--

10

Adjust the routing of the power steering hoses.

Did you complete the repair?

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Whine or Growl Noise from the Power Steering System With Hydraulic Brake Booster

Step

Action

Yes

No

1

Did you review the Power Steering System General Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Power Steering System

2

Verify that a whine or growl noise is present.

Is a whine or growl noise present?

Go to Step 3

System OK

3

Inspect the power steering fluid for the following indications of contamination:

    • Milky fluid - water
    • Brown fluid - burnt
    • Debris in fluid - plastic or dirt

Is the fluid free of contamination?

Go to Step 5

Go to Step 4

4

Flush the power steering system. Refer to Power Steering System Flushing.

Did you complete the procedure?

Go to Step 13

Go to Step 5

5

Inspect the power steering gear for a whine or growl noise using J 39570 .

Is the noise present at the power steering gear?

Go to Step 9

Go to Step 6

6

Inspect the power steering pump for a whine or growl noise using J 39570 .

Is the noise present at the power steering pump?

Go to Step 10

Go to Step 7

7

Inspect the power steering hoses for a whine or growl noise using J 39570 .

Is the noise present at the power steering hoses?

Go to Step 11

Go to Step 8

8

Inspect the hydraulic brake booster for a whine or growl noise using J 39570 .

Is the noise present at the hydro boost?

Go to Step 12

--

9

Replace the power steering gear. Refer to Steering Gear Replacement.

Did you complete the repair?

Go to Step 13

--

10

Replace the power steering pump. Refer to Power Steering Pump Replacement.

Did you complete the repair?

Go to Step 13

--

11

Adjust the routing of the power steering hoses.

Did you complete the repair?

Go to Step 13

--

12

Diagnose the hydraulic brake booster. Refer to Diagnostic Starting Point - Hydraulic Brakes.

Did you correct the condition?

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Whine or Growl Noise from the Power Steering System Two-Mode

Step

Action

Yes

No

1

Did you review the Power Steering System General Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Power Steering System

2

Verify that a whine or growl noise is present.

Is a whine or growl noise present?

Go to Step 3

System OK

3

Inspect the power steering gear for looseness and/or worn bushings.

Is the steering gear loose or the bushings worn?

Go to Step 6

Go to Step 4

4

Inspect the power steering assist motor for a whine or growl noise using chassis ear J 39570 .

Is the noise present at the power steering motor?

Go to Step 7

Go to Step 5

5

Inspect the power steering gear for a whine or growl noise using chassis ear J 39570 .

Is the noise present at the power steering gear?

Go to Step 8

Go to Step 3

6

Tighten the power steering gear fasteners or replace the power steering gear due to worn bushings. Refer to the appropriate procedure(s):

Did you complete the repair?

Go to Step 9

--

7

Replace the power steering assist motor. Refer to Power Steering Assist Motor Replacement.

Did you complete the repair?

Go to Step 9

--

8

Replace the power steering gear. Refer to Steering Gear Replacement.

Did you complete the repair?

Go to Step 9

--

9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3