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Subaru Forester 2020 Humming noise that gets louder with speed: Causes, Fixes, and Parts to Check

Use this guide to figure out what the symptom usually means, how urgent it is, and what to check before buying parts or booking the repair.

Editorial review

These problem guides are written to help drivers identify the most likely cause, make a sensible first check, and avoid wasting money on the wrong repair.

By Kreativ Auto Editorial Team Reviewed Jun 7, 2026
Problem guideFitment notes checkedParts links reviewed
Subaru Forester 2020 Humming noise that gets louder with speed: Causes, Fixes, and Parts to Check

What to know first

This is the short version if you want to decide how serious the problem is before digging deeper.

Repair urgency

Low to medium early on, but it becomes more important once the noise grows clearly

Can you drive it?

Usually yes in the early stage, but growing hub noise should not be ignored for long once it is obvious

Estimated cost

$80 to $520 depending on whether the repair stays at one hub assembly or diagnosis becomes broader

DIY difficulty

Moderate because the diagnosis is simple in theory but easy to get wrong in practice

Quick triage

Use this section if you want the shortest path from symptom to the first sensible check.

Quick verdict

A road-speed hum is often a wheel-bearing story, but the first useful step is still separating it from tire noise cleanly.

First thing to check

Start by comparing the sound pattern with tire condition and whether the noise changes with road speed and cornering load.

Can you drive it?

Usually yes in the early stage, but growing hub noise should not be ignored for long once it is obvious

Typical cost range

$80 to $520 depending on whether the repair stays at one hub assembly or diagnosis becomes broader

DIY difficulty

Moderate because the diagnosis is simple in theory but easy to get wrong in practice

Often confused with

  • Owners often blame tires first when the actual issue is starting to build inside the hub.
  • It also gets mistaken for a general driveline problem when the clue is still road-speed hum.

Stop driving if

  • The noise grows quickly, is joined by play, or the wheel-end feels unstable or overheated.

Symptoms

These are the signs drivers usually notice before the real cause is confirmed.

  • Low growl or hum that rises with road speed
  • Noise becomes more obvious on smoother pavement
  • Owners often blame tires before the hub becomes more obvious

Likely causes

Start with the common causes first so diagnosis stays efficient and the wrong parts do not get ordered too early.

  1. Wheel-bearing or hub wear starting to build road-speed noise
  2. Tire noise that masks the early bearing pattern
  3. Uneven wear or road-force variation confusing the diagnosis

What usually fixes it

Work through these in order so you can confirm the problem before spending money on parts.

  1. Separate tire noise from bearing noise before ordering parts
  2. Inspect for hub play or noise changes in turns if the pattern supports it
  3. Use an OE-style hub assembly when the wheel-bearing diagnosis is clear

When to involve a mechanic

These are the signs that the problem is moving past a basic driveway diagnosis.

  • The hum gets sharply louder or changes with cornering load
  • You suspect wheel play or heat at the hub
  • The tire-and-balance route has already been checked without solving the noise

Common mistakes

These are the errors that usually waste time, money, or both.

  • Buying a hub too early when the real issue is still the tire
  • Driving too long on a clearly growing wheel-end noise
  • Treating every hum like it must be a bearing without checking the tire first

Fitment and model notes

Before you order parts or assume the diagnosis is universal, check the trim, phase, and powertrain notes below.

Which trims this applies to

  • Most 2020 Subaru Forester daily-driver trims where this complaint still matches the normal ownership pattern.

When this does not apply

  • Do not assume every special trim, package, or non-US variant reacts exactly the same without confirming the actual hardware.

Pre-facelift vs facelift differences

  • Use this SK-era guide as a baseline and refine exact trim differences later.

Hybrid vs gas differences

  • The broad diagnosis still applies, but exact part choice can change by powertrain and package.

Related car pages

These vehicle pages give you more context if the same symptom shows up on a specific model.

Car hub

Subaru Forester 2020

The main Subaru Forester 2020 ownership issues worth watching, plus the maintenance and replacement parts that usually matter first.

Related best-parts guides

If you already know the likely repair area, these guides can help you compare the next parts to look at.

Wheel Bearings

Best wheel bearings for Subaru Forester 2020

These wheel-bearing picks are for owners who want a calm OE-style fix once the hum is clearly a hub problem.

FAQ

What usually causes a speed-related humming noise on a Subaru Forester?

Wheel-bearing or hub wear is a common cause, but tire noise and uneven wear should be separated first.

Can I keep driving if this problem is still mild?

Usually yes in the early stage, but growing hub noise should not be ignored for long once it is obvious