Subaru Impreza Premature Wheel Bearing Failure Guides (2017-2024)
The 5th and 6th generation Subaru Impreza models frequently experience premature rear wheel bearing failure, characterized by a loud humming or growling noise as early as 30,000 miles.
Last updated: 2026-05-15
What goes wrong
The integrated hub and bearing unit begins to lose lubrication efficiency due to water ingress. As the steel balls or rollers gall against the race, friction increases, generating significant heat and noise. If left unaddressed, the bearing can seize or allow the wheel to wobble, potentially damaging the axle or braking system.
Symptoms to watch for
- Drone or humming noise that increases with vehicle speed
- Rhythmic thumping or 'helicopter' sound from the rear of the car
- Grinding sensation felt through the floorboards or steering wheel
- Noise changes pitch when steering left or right (loading/unloading the bearing)
- ABS or Stability Control warning lights (in advanced failure stages)
Root cause
Inadequate weather sealing on the original factory hub units allows moisture and road salt to penetrate the bearing race, leading to oxidation and grease breakdown.
Buy time with these
- • Avoid driving through deep standing water or salt slush when possible.
- • Upgrade to newer revision OE hub units (Suffix -C or higher) if replacing out-of-pocket.
- • Listen closely for low-frequency hums and address immediately to prevent spindle damage.
Permanent fix
- Replacement of the hub and bearing assembly with the updated Subaru part number (e.g., 28473FL040 or latest supersession) and ensuring the axle nut is torqued exactly to 174 ft-lbs.
Related recalls / TSBs
FAQ
What causes subaru impreza premature wheel bearing failure guides (2017-2024)?
Inadequate weather sealing on the original factory hub units allows moisture and road salt to penetrate the bearing race, leading to oxidation and grease breakdown.
How much does it cost to fix?
National average $450–$1,100. Cost for a single hub replacement at a dealership is approximately $450-$550. If both rear bearings fail simultaneously, costs can exceed $1,000. Independent shops are usually 30% cheaper.
Is this a DIY repair?
Difficulty 3/5. Replacement of the hub and bearing assembly with the updated Subaru part number (e.g., 28473FL040 or latest supersession) and ensuring the axle nut is torqued exactly to 174 ft-lbs.
What are the symptoms?
Drone or humming noise that increases with vehicle speed; Rhythmic thumping or 'helicopter' sound from the rear of the car; Grinding sensation felt through the floorboards or steering wheel; Noise changes pitch when steering left or right (loading/unloading the bearing); ABS or Stability Control warning lights (in advanced failure stages)