GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2006 🢒 GTO 🢒 Suspension 🢒 Front Suspension 🢒 Suspension Bottoms

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 system descriptions 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. Refer to Vehicle Certification Label in General Information.

Did you find and correct the condition?

Go to Step 6

Go to Step 4

4

Perform the following inspections:

    • Inspect the front struts and the rear shock absorbers for damage or wear. Repair as necessary. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle .
    • Inspect the front springs for damage or wear. Repair as necessary. Refer to Strut, Strut Component, and Spring Replacement in Front Suspension.
    • Inspect the rear springs for damage or wear. Repair as necessary. Refer to Coil Spring Replacement in Rear Suspension.

Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Inspect the vehicle trim height. Repair as necessary. Refer to Trim Height Inspection .

Did you find and correct the condition?

Go to Step 6

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6

Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3