Humming noise

10

Asked by Jimboy29 Jan 17, 2019 at 04:54 PM about the 2017 Subaru Legacy 2.5i Premium AWD

Question type: General

Twice I’ve noticed my 2017 legacy premium with eyesight making a humming
noise while parked in my garage. When I turned the key to “accessory” the
humming stopped

8 Answers

1,600

Do you have the LED headlight package offered on that vehicle?

1,600

Sorry I hit submit too soon. Are you hearing this after the car has been parked and shut off for a few hours? Or is this while the car is running?

3 people found this helpful.
1,600

Fans would still kick on in accessory mode if ac is on. After about 4 hours since the motor is shut off and the computers are in sleep mode if the battery voltage is above 12.5v and ambient temp is above 40 degrees the computer runs an EVAP self test. The pump kicks on pressurizes the system and performs a leak check. If the test fails it runs a second test immediately after. If it fails again when the car is started the check engine light will be on. Very possible that the sound you’re hearing is the pump running. When you turned the car on it aborted the test this test/noise is a normal function and condition

12 people found this helpful.
10

This occurred after the car had been sitting for awhile. Also, since the Subaru dealer could not give me an answer, when we go away for 2 months, our 2017 legacy’s battery is always dead when we return. My 2012 vw starts right up. Thanks in advance.

1 people found this helpful.
1,600

I’m pretty sure it’s the EVAP self test is what you’re hearing but at times the cooling fans for the led lights kick on but usually only when the lights are warm after being on a while

1 people found this helpful.
1,600

When you let the car sit for extended periods of time it’s a good idea to disconnect the negative battery cable. Also if you leave the key fob within 8 feet from the car it will send a signal to the keyless access module every 45-60 seconds thus not allowing the computers to go into sleep mode. This causes excessive battery drain. There is a ECM update to improve battery life that the dealer will do free if you’re under the original 3 year 36,000 mile warranty.

6 people found this helpful.
Best Answer Mark helpful

Your Answer:

Legacy

Looking for a Used Legacy in your area?

CarGurus has 172 nationwide Legacy listings starting at $4,977.

Postal Code:

CarGurus Experts

  • #1
    TheSubaruGuruBoston
    Reputation
    2,800
  • #2
    Anthony_60
    Reputation
    1,800
  • #3
    Tom Hawkins
    Reputation
    1,510
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Subaru Outback
28 Great Deals out of 871 listings starting at $1,895
Used Subaru Impreza
28 Great Deals out of 473 listings starting at $3,850
Used Toyota Camry
48 Great Deals out of 979 listings starting at $2,212
Used Subaru Forester
22 Great Deals out of 1,056 listings starting at $2,695
Used Honda Accord
43 Great Deals out of 907 listings starting at $1,599
Used Honda Civic
176 Great Deals out of 3,690 listings starting at $1,995
Used Subaru WRX
24 Great Deals out of 515 listings starting at $8,990
Used Subaru Crosstrek
26 Great Deals out of 912 listings starting at $5,995
Used Toyota Corolla
122 Great Deals out of 1,994 listings starting at $2,795
Used Honda CR-V
99 Great Deals out of 3,843 listings starting at $1,795
Used Mazda MAZDA3
73 Great Deals out of 1,498 listings starting at $2,495
Used Lexus IS
18 Great Deals out of 305 listings starting at $6,449
Used Acura TLX
24 Great Deals out of 453 listings starting at $10,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.