Are you hearing a knocking noise when turning the steering wheel? This common issue can be alarming, but it’s important to identify the source quickly. A knocking or clunking sound when you steer can indicate anything from worn suspension components to damaged steering systems. Ignoring it may lead to more expensive repairs or even compromise driving safety.
In this guide, we explain the main causes of a knocking sound when steering, how to diagnose the problem, and what to do to fix it.
Why Is My Steering Wheel Making a Knocking Noise?
A knocking noise when turning can be caused by several components. Common reasons include:
1. Worn or Damaged CV Joints
CV joints (Constant Velocity joints) connect the driveshaft to the wheels.
- Symptoms: Clicking or knocking noise when turning sharply, especially during tight corners.
- Cause: CV joint boots may tear, allowing grease to escape and contaminants in.
- Fix: Inspect the CV boots and replace damaged joints immediately.
2. Worn Suspension Bushes
Suspension bushes absorb shocks and allow movement between suspension parts.
- Symptoms: Knocking, clunking, or rattling when steering over bumps or during turns.
- Cause: Bushes degrade over time due to wear and environmental exposure.
- Fix: Replace worn suspension bushes — commonly on wishbones, control arms, or anti-roll bars.
3. Faulty Ball Joints
Ball joints allow the wheels and suspension to pivot.
- Symptoms: Knocking or clunking noise when turning or driving over uneven surfaces.
- Cause: Wear or corrosion on ball joints.
- Fix: Replace worn ball joints immediately — driving on worn joints can be dangerous.
4. Loose or Damaged Steering Rack
The steering rack connects the steering wheel to the wheels.
- Symptoms: Knocking noise, play in the steering wheel, uneven steering response.
- Cause: Worn mounts, bushings, or internal rack components.
- Fix: Inspect the steering rack and replace or rebuild if needed.
5. Damaged Struts or Shock Absorbers
Struts and shocks absorb road impact.
- Symptoms: Clunking or knocking when turning, bouncing over bumps.
- Cause: Worn strut mounts or internal shocks.
- Fix: Replace damaged struts or shock absorbers.
6. Wheel Bearings
Wheel bearings allow the wheel to rotate smoothly.
- Symptoms: Knocking or grinding noise when turning, often increasing with speed.
- Cause: Bearings wear over time.
- Fix: Replace worn wheel bearings promptly.
How to Diagnose a Knocking Noise When Steering
- Listen Carefully: Note when the noise occurs — turning left, right, at low or high speed, or over bumps.
- Check Suspension: Inspect bushes, ball joints, and struts for wear or damage.
- Inspect Steering Components: Examine the steering rack, tie rods, and mounts.
- Check CV Joints: Look for torn boots or leaking grease.
- Wheel Bearings: Lift the car and check for play in the wheel hubs.
Pro Tip: Use an assistant to turn the wheel while you listen underneath the car. This often helps pinpoint the exact source of the knock.
Can I Drive With a Knocking Noise When Turning?
It depends on the cause:
- Unsafe: Worn ball joints, CV joints, or steering rack — these can fail and cause accidents.
- Moderate Risk: Worn bushes or strut mounts — might tolerate short distances at low speed, but repairs are recommended ASAP.
Always err on the side of caution — diagnose and repair the issue immediately to prevent further damage or safety risks.
How Much Does It Cost to Fix a Knocking Steering Wheel?
Costs vary depending on the problem:
| Component | Typical UK Cost (Parts + Labour) |
|---|---|
| CV Joint | £120 – £300 per joint |
| Ball Joint | £80 – £200 per joint |
| Suspension Bush | £50 – £150 per bush |
| Steering Rack | £250 – £600 (rack replacement) |
| Strut/Shock | £100 – £250 per strut/shock |
| Wheel Bearing | £80 – £200 per bearing |
Final Advice
- A knocking noise when steering should never be ignored.
- Always inspect suspension, steering, and drivetrain components.
- Use trusted garages for diagnosis — DIY repairs are possible, but some components are safety-critical.
FAQ – Knocking Noise When Turning Steering Wheel
Why does my steering wheel knock when turning slowly?
Likely causes are worn ball joints, suspension bushes, or CV joints. Check for play and wear in these components.
Can low power steering fluid cause knocking?
Yes. Some older vehicles may produce clunking noises if the power steering fluid is low, especially during tight turns.
Is a knocking steering wheel dangerous?
Yes — worn ball joints, steering racks, or CV joints can fail, causing loss of control. Diagnose immediately.
How do I stop my steering wheel from knocking?
Inspect and replace worn components like CV joints, ball joints, bushes, struts, or the steering rack. Regular maintenance prevents noise.
Can DIY fix a knocking noise when turning?
Minor issues like worn bushes may be DIY-friendly, but CV joints, steering racks, and ball joints require mechanical expertise. Always prioritise safety.
