how to tell if my GMC Sierra T1XX (2019-Present) struts are worn out or leaking

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

552 words

Problem Statement

Learn how to diagnose and fix worn or leaking struts on your GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms and repair instructions.

Affected Component

Suspension

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery when working with electronic components.
•Allow the vehicle to cool before working on suspension components to avoid burns.

Symptoms

•Unusual bouncing or excessive body roll during turns
•Noticeable decrease in ride comfort or increased harshness
•Fluid leaking around the strut assembly
•Uneven tire wear
•Vehicle sits lower on one side
•Clunking noise when driving over bumps

Diagnostic Steps

1
Visually inspect the struts for any signs of fluid leakage or damage.
2
Check the vehicle's ride height to see if it is uneven.
3
Perform a bounce test by pushing down on the front or rear of the vehicle and observing how many times it bounces.
4
Inspect the tires for uneven wear patterns that may indicate strut issues.
5
Listen for any unusual noises while driving over bumps or rough surfaces.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Hydraulic jack
•Jack stands
•Socket set
•Wrench set
•Torque wrench
•Brake line tool (if necessary)

Parts Required

•Replacement struts (front and/or rear as needed)
•Strut mounts or bushings (if worn)

Related Faults

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Diagnostic Steps

1
Visually inspect the struts for any signs of fluid leakage or damage.
2
Check the vehicle's ride height to see if it is uneven.
3
Perform a bounce test by pushing down on the front or rear of the vehicle and observing how many times it bounces.
4
Inspect the tires for uneven wear patterns that may indicate strut issues.
5
Listen for any unusual noises while driving over bumps or rough surfaces.

Solution

1. Preparation

Gather tools and parts required.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Wear safety glasses and gloves.

2. Lift the Vehicle

Use a hydraulic jack to lift the vehicle and secure it on jack stands.
Ensure the stands are placed under the vehicle's designated lift points.

3. Remove the Wheel

Use a socket set to remove the lug nuts and take off the wheel.
Keep the lug nuts in a safe place for reinstallation.

4. Inspect the Struts

Examine the strut assembly for any visible signs of leaking fluid or physical damage.
Check the rubber bushings and mounts for wear or cracking.

5. Replace the Struts (if necessary)

a. Remove Strut Assembly

Disconnect the brake line from the strut using a wrench.
Remove any retaining clips or brackets securing the strut.
Unbolt the strut from the lower control arm and the upper strut mount using a socket set.

b. Install New Struts

Position the new strut assembly in place and secure it to the lower control arm and upper mount.
Reattach the brake line and any clips or brackets.

6. Reinstall Wheel and Lower Vehicle

Put the wheel back on and hand-tighten the lug nuts.
Lower the vehicle from the jack stands and then torque the lug nuts to the manufacturer’s specifications.

7. Final Inspection

Double-check all connections and ensure that everything is secured.