Knocking Noise When Turning at Low Speed: 7 Causes, Diagnosis, and Repair Costs
Quick Answer: A knocking noise when turning at low speed is almost always caused by a worn CV joint, bad ball joints, or damaged tie rod ends. CV joints are the #1 culprit — they make a distinct rhythmic clicking or knocking sound during slow turns, especially when the wheel is at full lock. The fix ranges from $150 to $800 depending on the cause.
I diagnosed this exact problem on a 2014 Toyota Camry last year — the owner had been hearing a dull knock on left turns for about three weeks before bringing it in. Turned out to be a torn CV boot that had been leaking grease for months, leaving the joint bone-dry. Caught just in time before the joint itself seized. The repair cost $220. Had he waited another month, we’d have been looking at a full axle replacement at $450+.
That’s the thing with knocking sounds during turns — they almost always start small and get expensive fast if ignored.
Why Does the Knocking Only Happen When Turning?
The key word here is turning. When you turn the wheel, especially at low speed, several things happen simultaneously:
- CV joints flex to their maximum operating angle
- Ball joints take on lateral load from the change in direction
- The steering rack moves under pressure
- Strut mounts rotate with the steering assembly
Each of these components is under more stress during a turn than during straight-line driving. A worn part that holds together just fine going straight will announce itself the moment it’s asked to flex, rotate, or bear a different load angle. Low speed makes it worse because there’s no road noise to mask the sound.
7 Causes of Knocking When Turning at Low Speed
1. Worn CV Joint — Most Common Cause
The CV (Constant Velocity) joint is the single most common cause of knocking or clicking during low-speed turns, and it has a very specific sound signature that helps identify it.
What it sounds like: A rhythmic clicking or knocking that gets faster as the wheel speed increases, and is loudest when turning at full lock (steering wheel turned as far as it goes). The sound comes from the front of the car, usually one side only.
Why it happens: CV joints are packed with grease and sealed by a rubber boot. When the boot tears — which happens from age, road debris, or hitting a curb — the grease escapes and dirt enters. Without lubrication, the metal-on-metal contact inside the joint creates that distinctive knock.
How to check it yourself: Turn your wheel to full lock in a parking lot and drive in a slow circle. If the knocking gets significantly louder or faster, a CV joint is almost certainly the cause. Then check the inner edge of each front tire for grease splatter — a torn boot will fling grease outward as the joint spins.
Repair cost:
- CV boot replacement only (if caught early): $150–$250
- Full CV axle replacement: $300–$550 per side
- DIY CV axle: $80–$180 in parts
According to CarMD’s annual vehicle health report, CV axle replacement is one of the top 10 most common repairs on front-wheel-drive vehicles over 80,000 miles — so you’re far from alone if this is your issue.
Internal link: If the noise is more of a single clunk rather than a rhythmic knock, read our article on single clunk when turning — that points to a different cause.
2. Worn Ball Joints
Ball joints connect the wheel hub to the suspension control arms. They work like the ball-and-socket joint in your shoulder — they need to rotate freely in all directions while supporting the entire weight of the vehicle.
What it sounds like: A dull, hollow knocking or clunking that occurs during turns and when going over bumps. Unlike CV joints, ball joint noise is less rhythmic and more of an occasional thud when the joint shifts under load.
How to check: Jack up the front of the car safely and grab the tire at the 12 o’clock and 6 o’clock positions. Try to rock it up and down. Any noticeable play (movement) that isn’t smooth indicates a worn ball joint. Then grab at 9 and 3 o’clock and rock side to side — excessive play there points more to a tie rod issue.
Warning signs you shouldn’t ignore:
- Knocking that’s getting louder week by week
- Uneven tire wear on the inside or outside edge
- The car pulling to one side without brake input
- A wandering, vague feeling in the steering
A severely worn ball joint can separate from the control arm without warning, causing complete loss of steering control. This is not a repair to delay. The National Highway Traffic Safety Administration (NHTSA) has issued recalls on multiple vehicle models specifically for ball joint failures — it’s taken seriously as a safety issue.
Repair cost:
- Ball joint replacement: $200–$500 per joint including labor
- DIY parts: $30–$100 per joint (pressing required on most vehicles)
For a detailed breakdown of all the warning signs, see our guide on bad ball joint symptoms.
3. Damaged Tie Rod Ends
Tie rods connect your steering rack to the wheel hub, translating the movement of the steering wheel into actual wheel turn. Each tie rod has an end with a ball joint — and that ball joint wears out over time.
What it sounds like: A knocking or clunking noise when turning, often accompanied by a slight looseness or imprecision in the steering. The noise may also occur when hitting potholes or going over rough road surfaces.
How to check: With the car on a level surface and the wheel straight, grab the front tire at 9 and 3 o’clock and try to rock it side to side. Any play or looseness means the tie rod end needs inspection. You can also have a helper turn the wheel left and right slowly while you watch the tie rod end — worn ones will show visible slop before the wheel actually moves.
Additional symptoms:
- Steering wheel vibration at highway speeds (often from the resulting misalignment)
- Uneven tire wear, particularly feathering on the edges
- Car failing alignment — tie rod issues make alignment impossible to hold
Repair cost:
- Tie rod end replacement: $100–$300 per side including labor and alignment
- DIY parts: $20–$60 per side
4. Loose or Worn Steering Rack
The steering rack converts the rotational movement of your steering wheel into the side-to-side movement that actually turns your wheels. It’s a precision component — when it develops play or wear, you’ll feel and hear it.
What it sounds like: A knocking or clunking sound that seems to come from the center of the car, directly behind the dashboard. It often happens when first turning after driving straight, rather than throughout the entire turning motion.
Additional signs of steering rack problems:
- Noticeable looseness or “dead zone” when the wheel is centered
- The steering wheel doesn’t return to center naturally after a turn
- Difficulty keeping the car in a straight line on the highway
- Clunking when the wheel reaches its lock position
Repair cost:
- Steering rack replacement: $600–$1,500 including labor (more expensive due to labor intensity)
- Remanufactured rack: $300–$600 in parts
This is one of the more expensive repairs on this list, which is why it’s worth ruling out CV joints and ball joints first — they’re far more common and much cheaper to fix.
5. Worn Strut Mounts / Top Mounts
Strut mounts sit at the top of your strut assembly, inside the wheel arch. They do two jobs: they support the weight of the car, and they act as a bearing that allows the strut to rotate when you turn the wheel. When the bearing inside the mount wears out, you get a knocking sound every time the wheel turns.
What it sounds like: A knock or creak that happens specifically when the steering wheel is moved — not necessarily when bumps are hit. Often described as a “grinding” feel in the steering column rather than just a noise. More noticeable when turning from a standstill (parking maneuvers).
How to check: With the car parked, have someone turn the steering wheel back and forth slowly while you put your hand on the strut tower (the raised bump in the engine bay above each front wheel). A worn strut mount will transmit a knock or grinding vibration you can feel directly through your hand.
Repair cost:
- Strut mount replacement: $150–$400 per side including labor
- Often done together with strut replacement: $300–$700 per side
For more context on strut-related noises, see our article on how long can you drive with bad struts — it covers when strut wear becomes a safety issue.
6. Low or Contaminated Power Steering Fluid
This is the least serious cause on this list, but worth checking first because it takes 30 seconds and costs nothing to diagnose.
What it sounds like: A whining, groaning, or knocking noise when turning, particularly at low speeds or when the wheel is near full lock. The noise may change pitch as the wheel moves.
How to check: Locate the power steering fluid reservoir (usually a small translucent reservoir near the engine with a steering wheel symbol on the cap). Check the level — it should be between the MIN and MAX marks. Also check the color — fresh power steering fluid is clear to light pink. Dark brown or black fluid means it’s contaminated and needs flushing.
Note: If your car has electric power steering (most cars built after 2012), there is no power steering fluid. Skip this check — electric systems don’t make this type of noise.
Fix cost:
- Fluid top-up: $10–$20
- Full power steering flush: $80–$150 at a shop
7. Worn Sway Bar Links or Bushings
Sway bar links connect the sway bar (anti-roll bar) to the suspension on each side. They’re often overlooked but are a common source of knocking noises during turns, particularly on rougher roads.
What it sounds like: A knocking or rattling noise during turns that may also appear when going over bumps or uneven road surfaces. Often described as a loose, rattling sound rather than a solid knock.
How to check: With the car raised safely on jack stands, grab the sway bar link and try to move it. It should be firm with no play. If it clunks or rattles when moved, it’s worn.
Repair cost:
- Sway bar link replacement: $80–$200 per side including labor
- DIY parts: $15–$40 per side
Also check our article on humming noise getting louder with speed — if you have both a knocking on turns and a hum at speed, you may have a wheel bearing issue as well.
How to Diagnose Which Part Is Causing Your Knock
Use this systematic approach before spending any money:
Step 1 — Identify the sound type
| Sound | Most Likely Cause |
|---|---|
| Rhythmic clicking, faster with speed | CV joint |
| Dull thud or clunk, occasional | Ball joint |
| Knocking + steering looseness | Tie rod end or steering rack |
| Grinding creak from wheel arch | Strut mount |
| Whining or groaning | Power steering fluid |
| Rattling knock, worse on bumps | Sway bar links |
Step 2 — Identify when it happens
- Only during slow turns, especially at full lock → CV joint (90% probability)
- Turns AND bumps → Ball joint or sway bar link
- Only when first turning from straight → Steering rack
- When turning from standstill → Strut mount bearing
- Any turn, any speed → Tie rod end
Step 3 — Identify which side
Drive slowly in a quiet car park. Turn left slowly — does the noise get louder? Then the problem is on the right side (right CV joint, right ball joint, etc.). Turn right and the noise increases? Problem is on the left side. This is because turning one way puts maximum stress on the opposite side’s components.
Step 4 — Do the physical checks
Jack up the front of the car (safely, with axle stands — never just a jack). Grab each tire and check for play at 12/6 o’clock (ball joint) and 9/3 o’clock (tie rod). Inspect CV boots for tears and grease splatter. Try to move sway bar links by hand.
Is It Safe to Drive With a Knocking Noise When Turning?
Depends entirely on the cause:
| Cause | Safe to drive? | How long? |
|---|---|---|
| Low power steering fluid | ⚠️ Short term | Top up immediately |
| Sway bar link | ✅ Carefully | 1–2 weeks |
| Strut mount | ⚠️ Carefully | 1 week max |
| CV joint (early stage) | ⚠️ Carefully | Days to a week |
| Tie rod end | ❌ No | Fix immediately |
| Ball joint | ❌ No | Fix immediately |
| Steering rack | ❌ No | Fix immediately |
Ball joints and tie rod ends are in a different category from the rest. A ball joint that separates or a tie rod end that breaks will cause immediate, complete loss of steering control at any speed. These are not repairs to put off until next payday.
If you’re noticing the steering feeling vague, loose, or unpredictable alongside the knocking — get the car inspected today.
See our full guide on signs of a bad wheel alignment — alignment issues often accompany worn steering and suspension parts and can help confirm your diagnosis.
Repair Cost Summary
| Repair | DIY Cost | Shop Cost |
|---|---|---|
| CV boot replacement | $30–$60 | $150–$250 |
| CV axle replacement | $80–$180 | $300–$550 |
| Ball joint replacement | $30–$100 | $200–$500 |
| Tie rod end replacement | $20–$60 | $100–$300 |
| Strut mount replacement | $50–$120 | $150–$400 |
| Steering rack replacement | $300–$600 | $600–$1,500 |
| Sway bar link replacement | $15–$40 | $80–$200 |
| Power steering fluid top-up | $10–$20 | $20–$30 |
Preventing Knocking Noises From Developing
Most steering and suspension knocks are preventable with consistent maintenance:
Inspect CV boots at every oil change. A torn CV boot costs $150 to fix. A destroyed CV joint from a torn boot costs $400. The boot is a 5-second visual check — look for grease splatter or a torn rubber boot at the inner edge of each front tire.
Grease all greasable joints. Some ball joints and tie rod ends have grease fittings (Zerk fittings). If yours do, they should be greased every 15,000–30,000 miles. Many modern joints are “sealed for life” — which unfortunately just means they can’t be greased and will eventually fail.
Don’t ignore wheel alignment. Misalignment creates uneven stress on ball joints and tie rod ends, accelerating wear dramatically. Get alignment checked every 12 months or after any significant pothole or curb impact. Also read our article on steering wheel off center after hitting curb — curb strikes are one of the most common causes of accelerated steering component wear.
Address small knocks early. A CV joint caught with a torn boot but no joint damage = $150 repair. The same CV joint caught after 3 months of driving without grease = $450 repair. The math is simple.
Frequently Asked Questions
What does a bad CV joint sound like when turning? A bad CV joint makes a rhythmic clicking or knocking sound that increases in speed as the wheel rotates faster. It’s most noticeable during slow turns with the steering wheel near full lock — like reversing out of a driveway or doing a U-turn in a car park. The sound usually comes from one side only.
Can I drive with a knocking noise when turning? For minor causes like a sway bar link or early-stage CV joint — yes, for a short time. For ball joints, tie rod ends, or a loose steering rack — no. These components can fail completely without warning and cause loss of steering control. Get an inspection within 24–48 hours if you suspect these parts.
Why does my car knock when turning but not going straight? Because turning puts components under a completely different type of stress than straight-line driving. CV joints flex to their maximum angle, ball joints bear lateral loads, and strut mounts rotate — all things that don’t happen when driving straight. A part that’s worn but still functional in one direction will reveal itself when asked to work differently.
How much does it cost to fix a knocking noise when turning? It ranges from $20 (power steering fluid top-up) to $1,500+ (steering rack replacement). The most common repair — CV axle replacement — costs $300–$550 at a shop. Getting a proper diagnosis first prevents paying for the wrong repair.
My car knocks when turning at low speed but not at high speed — why? At higher speeds, road noise masks the knocking. Also, at higher speeds you’re rarely at full steering lock. CV joint noise is classically worse at low speed with full lock — if the noise disappears completely on the highway, CV joint is the most likely cause.
Can wheel bearings cause knocking when turning? Wheel bearings more commonly cause a humming or growling noise rather than a knock, and the sound usually changes when you shift your weight in the car. However, a severely worn wheel bearing can cause knocking. Read our guide on humming noise getting louder with speed to compare the symptoms.
How long do CV joints last? Most CV joints last 100,000–150,000 miles under normal conditions. However, a single torn CV boot — which can happen at any mileage from road debris — will destroy a CV joint within weeks if not caught. Regular visual inspection of the boots extends CV joint life significantly.
Heard a knock on your last turn? Drop your car make, model, mileage, and exactly when the noise happens in the comments — happy to help narrow it down.
