GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 Yukon XL Denali 🢒 Suspension 🢒 Suspension General Diagnosis 🢒 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 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

Inspect for vehicle overloading and correct the overloading condition as necessary. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label in General Information.

Did you find and correct the condition?

Go to Step 6

Go to Step 4

4

Inspect the following components:

    • Inspect the shock absorbers. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle .
    • Inspect for damaged coil springs, torsion bar or leaf springs and replace as necessary. Refer to Torsion Bar Replacement in Front Suspension or Leaf Spring Replacement or 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. Refer to Trim Height Inspection .

Did you complete the trim height inspection procedure?

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