[twonb1]

Hello guys I need your help. I have a 2014 335i all stock with about 30k on the clock. The car is making a high pitch sound only above 15mph the sound does not vary with speed or change in pitch. Its been at dealer now for about 2 weeks with no luck. They had tried replacing my brakes, the fuel pump, and the my put a different set of rims and tire on. Any ideas suggestion?

Thanks in advance

[twonb1]

No body???

[twonb1]

Bump

[XxThe_RemedyXx]

I have the same noise in my cabin. Waiting to hear back from the dealer to schedule a service.

High Pitched Whistle in Cabin http://f30.bimmerpost.com/forums/sho....php?t=1439331

[twonb1]

Originally Posted by XxThe_RemedyXx

I have the same noise in my cabin. Waiting to hear back from the dealer to schedule a service.

High Pitched Whistle in Cabin http://f30.bimmerpost.com/forums/sho....php?t=1439331

Is your consent above 15mph?

[XxThe_RemedyXx]

Originally Posted by twonb1

Is your consent above 15mph?

It's not constant, it comes in intervals but yes if I remember correctly it's around 15-20 MPH.

[twonb1]

Originally Posted by XxThe_RemedyXx

It's not constant, it comes in intervals but yes if I remember correctly it's around 15-20 MPH.

The sound is identical to what I'm hearing

[Newman1]

While researching this on older threads, I came across this from another member:

"I have a 2013 328 that had this exact same issue. Took it to the dealer and did a test drive with the shop foreman in the car. Surprise surprise it didn't happen then.
Fortunately the foreman knew right away once I explained the symptoms. He was able to reproduce it by turning off the A/C but leaving the fan on. He said they recently received a service bulletin about this issue caused by the heater expansion valve. I have not experience this issue again after the dealer replaced the expansion valve (Feb 2016). Whereas before I was getting this issue once every few weeks, especially on the warmer days."

[twonb1]

Originally Posted by Newman1

While researching this on older threads, I came across this from another member:

"I have a 2013 328 that had this exact same issue. Took it to the dealer and did a test drive with the shop foreman in the car. Surprise surprise it didn't happen then.
Fortunately the foreman knew right away once I explained the symptoms. He was able to reproduce it by turning off the A/C but leaving the fan on. He said they recently received a service bulletin about this issue caused by the heater expansion valve. I have not experience this issue again after the dealer replaced the expansion valve (Feb 2016). Whereas before I was getting this issue once every few weeks, especially on the warmer days."

For my car it does not matter if the ac is on or off same for the fans. It makes the noise above 15mph

[twonb1]

Update... dealer is thinking it might be exhaust related. I will date on Tuesday

[Newman1]

I think your sound must have been different than mine, then. My dealership fixed my high pitched sound concerns.

[twonb1]

Update..... dealer called me said they were able to possibly pin point the sound and will be replacing my rear diff.

[f30ser3]

Is car still in warranty? In Europe warranty is only 2 years.

[twonb1]

Yes it's still under warranty

[LaGSa]

I'm also experiencing a similar issue. I can hear a high pitch and a slightly lower one. It isn't related to rpm but to wheels speed.
The car was also diagnosed with a faulty differential and it's due to service on Monday.
Hopefully it will be ok. The car is 3 weeks old

I've now got a new differential and the car is quiet again. Hopefully it will stay so

[Hairy Pete]

Just a few months before the warranty ran out I had this noise and once you tuned into it it was a pain - Dealer changed something on the drive train to fix it - car was in for 2 days. It has solved the problem.

[twonb1]

What's up guys just wanted to let everyone know. That I got the car back and it was the rear diff. The sound is gone and I'm super happy