A technician is diagnosing a vehicle with a complaint of a 'popping' or 'clicking' noise heard only when turning the steering wheel, particularly at slow speeds or when the suspension is articulating. The sound seems to come from the area of the front strut towers. What is the MOST likely cause of this noise?
- AExcessive play in the steering rack's internal components.
- BA faulty electric power steering (EPS) motor.
- CA worn or damaged strut bearing (mount).
- DA worn steering column universal joint.
Show answer & explanationAnswer & explanation
Correct answer: C. A worn or damaged strut bearing (mount).
A 'popping' or 'clicking' noise emanating from the strut tower area specifically when turning the steering wheel or articulating the suspension is a classic symptom of a worn or damaged strut bearing (also known as a strut mount bearing). This bearing allows the strut and spring assembly to rotate smoothly with the steering input. When it wears, it can bind and then release, causing the popping or clicking sound.
Why the other options are wrong
- A. Excessive play in the steering rack's internal components would cause looseness, clunking, or grinding within the rack itself, not a distinct pop from the strut tower.
- B. A faulty EPS motor would cause issues with power assist (loss, inconsistent) and potentially humming, not a mechanical pop from the strut tower.
- D. A worn steering column universal joint would cause a clunk or binding felt in the steering wheel, not a pop from the strut tower.
Strut Bearing Noise
A 'popping' or 'clicking' noise from the front suspension, especially when turning the steering wheel at low speeds or articulating the suspension, is often caused by a worn or damaged strut bearing (mount) that prevents smooth rotation of the strut.
- Allows strut/spring to rotate with steering.
- Wear causes binding and noise.
- Noise is typically heard from top of strut tower.
Memory trick: Clicking when turning? Check the strut bearing's spin.