The steering has become heavy, notchy or vague, the wheel has noticeable free play before the car responds, the noise is a heavy metallic knock rather than a click or creak, or the noise appeared immediately after hitting a kerb or pothole hard. Those point at something structural in the steering or suspension rather than a worn bush, and they are not conditions to drive on. A grinding that is getting rapidly worse over days is in the same category.
Match the sound first
Clicking at full lock
A rhythmic click or knock — one per wheel revolution, speeding up as you speed up — heard while turning tightly at low speed is the classic sign of a worn constant velocity joint, usually the outer one.
CV joints let a driven wheel steer and move up and down while still receiving power. They are packed with grease and sealed by a rubber boot. When the boot splits, grease escapes and grit gets in, and the joint wears. The click is the worn joint under load at an angle.
What makes it recognisable:
- Front-wheel-drive cars mainly, and four-wheel-drive ones.
- Only when turning, and worse the tighter the turn.
- Worse under power — accelerating gently around a tight corner, such as pulling out of a parking space.
- Louder on one lock than the other, which tells you which side.
- Often preceded by grease flung around the inside of the wheel — a split boot leaves a spray pattern that is visible if you look.
A split boot caught early is a much smaller job than a failed joint, which is why the spray pattern is worth looking for even without a noise.
Whining or groaning
A whine or groan that rises and falls with how hard you are turning, and is loudest approaching full lock, points at the power steering system.
First, establish which kind you have. Many modern cars use electric power steering with no fluid at all; older ones and many larger vehicles use hydraulic. If there is no power steering fluid reservoir under the bonnet, the fluid advice does not apply to you.
On hydraulic systems:
- Low fluid is the most common cause, and it means a leak somewhere, because the system is sealed. Topping up is first aid.
- Air in the system, which produces a foamy fluid and a groan.
- A failing pump, usually a whine that is present all the time and worsens with steering effort.
- The wrong fluid, which some systems tolerate badly.
On electric systems, a whine or buzz when turning is usually the assist motor, and is normal on many cars — particularly when parking. A sudden change in that sound, or steering that becomes heavy along with it, is not.
One more possibility that mimics power steering: a slipping drive belt. If the whine or squeal also appears when you switch on the air conditioning or when the engine is cold, and eases as things warm up, look at the belt rather than the steering.
Creaking and popping
A creak, groan or pop at low speed — parking, turning into a driveway, going over a speed bump while turning — is usually suspension rather than steering.
- Strut top mounts. These allow the strut to rotate as you steer. When the bearing inside wears, you get a distinct creak or a series of pops as you turn the wheel, often worse at full lock and often audible with the car stationary.
- Bushings. Rubber bushes harden with age and cold, and produce creaks under load. Worse in cold weather is a strong hint.
- Ball joints, which tend to knock rather than creak, and usually also make noise over bumps in a straight line.
- Anti-roll bar links, which knock or rattle, again usually over bumps as well as when turning.
The distinguishing question is whether the noise happens only when steering or also over bumps in a straight line. Only when steering points more at the strut mount; both points more at joints and links.
Grinding, and the weave test
A grinding, humming or droning that changes with speed rather than with steering angle is usually a wheel bearing, and there is a simple test that identifies it.
The weave test: on a clear, safe road at a steady moderate speed, gently weave from side to side within your lane — smooth, small movements, nothing abrupt.
- The noise gets louder when you steer one way and quieter the other → a wheel bearing. Weight transfers onto the bearing when you turn away from it, so a left-hand curve loads the right-hand bearing.
- No change at all → less likely to be a bearing; consider tyres, which also hum and drone.
The reason this test matters is that bearings and tyres sound very similar, and tyre noise is far cheaper to be wrong about in the other direction. Uneven or scalloped tyre wear produces a drone that rises with speed exactly like a bearing does.
Grinding that appears only while braking and turning is more likely brakes than bearings, and grinding that sounds metallic and harsh with no other symptoms should be treated as urgent.
Rubbing and squealing
A rubbing or scuffing sound at or near full lock, especially over a bump, is often mechanical contact rather than a worn part.
- Tyre touching the wheel arch liner or bodywork. Common after fitting larger wheels or wider tyres, or if a liner has come loose. Look for scuff marks inside the arch.
- A loose splash guard or undertray catching the tyre on full lock.
- Suspension at the limit of its travel, which produces a rubbing or thud when turning tightly over a bump with a loaded car.
- Brake wear indicators, which squeal — although these usually make noise in a straight line as well.
These are worth checking early because several of them are free to confirm: turn the wheel to full lock with the engine off, and look into the arch with a torch.
Stationary versus moving
Whether the car is moving is a strong filter, and it is easy to test in a car park.
- Noise with the car stationary, engine running, turning the wheel → power steering, strut mounts, or something rubbing. The drivetrain is not loaded, so CV joints and bearings are unlikely.
- Noise only when moving and turning → CV joints, bearings, brakes, or tyres.
- Noise with the engine off, rocking the wheel by hand → mechanical play in the steering or suspension, and worth attention.
- Noise at speed on a straight road that changes when you turn → bearing or tyre.
Doing this deliberately, once, in a quiet car park with the windows down gives you a much better description than noticing it in traffic — and a precise description is what gets diagnosed correctly.
What to check, in order
- Heavy or vague steering, free play, or a heavy metallic knock? Stop and get it looked at rather than continuing.
- Find a quiet car park. Engine running, windows down, turn the wheel lock to lock while stationary and listen.
- Then drive slowly in circles both directions at full lock and listen again.
- Name the sound — click, whine, creak, grind, rub. That word does most of the diagnosis.
- Rhythmic click at low-speed full lock? Look for grease sprayed inside the wheel and around the driveshaft boot.
- Whine rising with effort? Check whether the car even has power steering fluid, and check the level if it does.
- Do the weave test on a clear road for grinding or droning noises.
- Turn to full lock with the engine off and look into the wheel arch for scuff marks and loose liners.
- Note whether it also happens over bumps in a straight line, which separates joints from strut mounts.
- Describe it precisely to the garage — sound, speed, lock angle, and whether the car was moving.
Name the sound before anything else, because four different systems make four different noises. A rhythmic click at low speed on full lock is a constant velocity joint, and there is usually grease sprayed inside the wheel to confirm it. A whine or groan that rises with steering effort is power steering — but check first whether your car even has hydraulic fluid, since many modern cars are electric and have none. Creaks and pops at full lock are usually strut mounts or hardened bushings, and the question that separates them is whether the noise also happens over bumps in a straight line. And grinding or droning that changes with speed is a wheel bearing, identified by weaving gently within your lane: if it gets louder turning one way and quieter the other, that is a bearing rather than a tyre.
Sources
- UK Driver and Vehicle Standards Agency — MOT inspection manual: Steering (what counts as excessive play and a defective joint)