GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

DEFINITION: A loud bang or thump that can usually be felt and/or heard when the vehicle is driven over bumps. This condition is commonly noticed when the vehicle trim height is too low.

1

Did you review the General Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Suspension General Diagnosis

2

Verify that the suspension bottoms.

Does the vehicle operate normally?

System OK

Go to Step 3

3

Check for vehicle overloading. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label in General Information.

Is the vehicle overloaded?

Go to Step 6

Go to Step 4

4

Inspect the vehicle trim height. Refer to Trim Height Inspection in Wheel Alignment.

Is the vehicle trim height incorrect?

Go to Step 7

Go to Step 5

5

Inspect the struts and shock absorbers. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle .

Are the components in need of replacement?

Go to Step 8

Go to Step 9

6

Remove the excess weight from the vehicle.

Did you remove the excess weight from the vehicle?

Go to Step 9

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7

Correct the vehicle trim height. Refer to Trim Height Inspection in Wheel Alignment.

Did you complete the repair?

Go to Step 9

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8

Replace the components as necessary.

Did you complete the repair?

Go to Step 9

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9

Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3