What you're looking for when you check a CV joint

A CV joint connects your engine's power to your front wheels and lets them turn at different angles. When it wears out, it usually tells you through sound or movement before it fails completely. You're checking for torn rubber boots (the accordion-like covers), grease leaking out, and clicking or popping sounds when you turn.

The good news: you can do a basic visual check yourself in about 10 minutes without special tools. You won't be able to measure wear precisely or take the joint apart, but you can spot the problems that mean it needs professional attention soon.

Key Takeaways

  • CV joint boots tear from age and road salt, and once torn, the joint fails quickly because the grease leaks out and dirt gets in.
  • A clicking sound when turning sharply is the most common sign of a worn CV joint, and it gets louder as the damage spreads.
  • You can inspect the rubber boots visually from underneath the car or by turning the wheel fully and looking at the axle shaft.
  • If you find a torn boot early, replacing just the boot is cheaper than replacing the entire joint later.

Visual inspection: checking the rubber boots

Park on level ground and engage the parking brake. You'll be looking at the axle shaft that runs from the transmission to the wheel. On each end of that shaft is a rubber boot that looks like an accordion or a small bellows. These boots keep grease in and dirt out.

Turn the steering wheel all the way to one side. This pulls the axle shaft and stretches the boot, making tears easier to spot. Crouch down and look at the outer boot (the one closer to the wheel). Look for splits, cracks, or holes in the rubber. If you see grease splattered on the inside of the wheel or on the axle shaft itself, the boot has already torn.

Repeat on the other side by turning the wheel the opposite direction. Check the inner boot as well — it's harder to see, but you can reach under the car to feel it. A torn boot feels sticky from leaking grease, and you may see dark grease buildup around it.

Listen for clicking when turning

A clicking or popping sound when you turn the steering wheel sharply is a strong sign the CV joint itself is damaged. This happens because the joint has worn grooves, and the ball bearings inside rattle as they move through those grooves.

Drive slowly in a safe, empty area — a parking lot works well. Turn the wheel all the way to the left and drive in a tight circle. Listen for a rapid clicking sound that speeds up as you go faster. Then turn the wheel all the way to the right and repeat. The clicking should be loudest on the side where the joint is worn.

If you hear clicking only when turning, not when driving straight, that's a classic CV joint symptom. If you hear it all the time, the problem may be something else — a wheel bearing, for example — but you should still have it checked.

Check for vibration or shaking

A severely worn CV joint can cause vibration in the steering wheel or the whole car, especially at highway speeds. This happens when the joint can no longer transfer power smoothly because the internal parts are too worn.

Drive at a steady speed on a straight road and pay attention to whether the steering wheel vibrates or if you feel shaking through the seat. If the vibration gets worse when you accelerate or turn, and better when you coast, it points to the CV joint. Vibration that happens only at certain speeds might be a wheel balance issue instead, but either way, it's worth having checked.

What to do if you find damage

A small crack in the boot doesn't mean the joint has failed yet, but it means failure is coming. Once the boot tears, grease leaks out within days or weeks, and dirt gets in. The joint then wears rapidly and can seize or break while you're driving.

If you find a torn boot, you have two repair options. A shop can replace just the boot and repack the joint with fresh grease — this is the cheaper route if caught early. If the joint itself is already damaged (you'll know because the clicking is loud or constant), the whole axle assembly usually needs to be replaced.

A clicking sound or torn boot doesn't mean you've lost your brakes or steering — the car is still safe to drive to a mechanic. But don't ignore it or put it off. A failed CV joint can leave you stranded, and the longer you wait, the more expensive the repair becomes.

When to do this check

Check your CV joints every time you rotate your tires, or at least once a year. In areas with heavy road salt or lots of potholes, check twice a year. Salt corrodes the rubber boots faster, and potholes can tear them on impact.

Also check after you hit something hard — a deep pothole, a curb, or debris in the road. A sudden impact can tear a boot that was already weakening, and catching it right away saves money.

Frequently Asked Questions

How long can I drive with a torn CV boot?

A few days to a few weeks, depending on how much grease leaks out and how much dirt gets in. Once the joint runs dry, it wears very fast. Don't plan a long trip with a torn boot — have it inspected first.

Can I replace a CV boot myself?

Yes, but it's messy and requires removing the axle shaft. You'll need a jack, jack stands, and some specialty tools. Many people find it easier to let a shop do it, especially since they can inspect the joint itself while it's out.

What's the difference between an inner and outer CV joint?

The outer joint (at the wheel) handles both power transfer and steering angle, so it wears faster and is more likely to click. The inner joint (at the transmission) mostly just transfers power. Both can fail, but outer joint problems are more common.

Does a clicking CV joint get worse over time?

Yes. The clicking starts quiet and gets louder as the grooves in the joint deepen. Once you hear it clearly, the joint is already significantly worn and replacement is usually the better choice than just replacing the boot.

Can I drive on the highway with a clicking CV joint?

Technically yes, but it's risky. The joint could fail suddenly, and highway speeds make that failure more dangerous. Get it inspected before taking a long trip, and have it repaired soon after.