Symptoms
- Roaring or growling noise that gets louder the faster you go
- Not strongly tied to engine RPM specifically
- May be louder in one part of the car or from one side
- Sound may change slightly when turning
Likely causes
- CommonWorn wheel bearingA bearing nearing failure often produces a roar or growl that scales with speed and can shift when turning.
- CommonWorn, uneven, or mismatched tiresCertain wear patterns and tire types can generate a speed-dependent roar.
- PossibleWind noise from a roof rack, open sunroof gap, or damaged trimAerodynamic noise increases sharply with speed, similar in pattern to a bearing roar.
- PossibleDifferential or transmission bearing wearSome drivetrain components can create a speed-related roar as they wear.
- Less commonExhaust system resonance at certain speedsOccasionally an exhaust design or minor leak resonates more at specific speed ranges.
What to do
- Note whether the roar changes when you gently weave left and right at a safe, low speed in an empty area, which can indicate a wheel bearing on the loaded side.
- Check for any wind-related sources first, like a slightly open sunroof, roof rack, or loose trim, since these are simple to rule out.
- Inspect tire tread for uneven wear patterns and confirm all tires are the same type and roughly the same wear level.
- Have the tires rotated to see if the noise changes position or intensity, which helps confirm tire involvement.
- Have a shop check wheel bearings by lifting each wheel and checking for play or roughness when spun.
- If the roar changes noticeably when turning, prioritize a wheel bearing inspection on the side that gets quieter or louder in a turn.
- Have a mechanic road-test the vehicle to help pinpoint the exact source if you can't isolate it yourself.
- Address a confirmed wheel bearing issue promptly, since it's a safety-related component that can fail further if ignored.
Tools and parts
- Flashlight
Wheel bearing/hub assemblySearch: “wheel bearing hub assembly for [year make model]”
Tires (if worn)Search: “tires for [year make model]”
When to call a pro
A speed-dependent roar is best confirmed by a shop checking wheel bearings and tires together, since both produce a similar symptom pattern.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.