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 and correct the overloading condition as necessary.

Did you find and correct the condition?

Go to Step 7

Go to Step 4

4

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

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Inspect the suspension coil springs for wear or damage:

Are the suspension coil springs worn or damaged?

Go to Step 7

Go to Step 6

6

Inspect the vehicle trim height. Refer to Trim Height Inspection.

Did you find and correct the condition?

Go to Step 7

Go to Strategy Based Diagnosis in General Information.

7

Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3