# 2009 E350 Mercedes High pitched noise coming from rear of car **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [August 25, 2019, 5:37am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439 "2019-08-25T05:37:59Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![sj.raymond\_156661](https://avatars.discourse-cdn.com/v4/letter/s/ccd318/32.png) [@sj.raymond\_156661](https://community.cartalk.com/u/sj.raymond_156661)\ **Post date:** [August 25, 2019, 5:37am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/1 "2019-08-25T05:37:59Z")
Hello All, First time here, I have a 118k Mile 2009 E350 recently I’ve had a noise coming from the rear of the car, this started off very quietly but progressed to a decent volume, I’ve replaced the rear bearings on both sides, this made the noise ALMOST go away … for about 2 days then it returned. Any other ideas of things that I should check? Details about the noise : Changes volume and pitch only based on the speed of the car, putting it into neutral whilst at speed makes no difference to noise at all, there’s no change as it shifts through the gears. Purely related to speed. For the level of noise reference, at 70 mph it sounds like you’re holding 3500 Rpm or so. As mentioned I put new wheel bearings on the rear and it came back after only 2 days. I appreciate any input or suggestions. Thanks ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [August 25, 2019, 5:44am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/2 "2019-08-25T05:44:34Z")
Does the sound change at all when you press the brake pedal? ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [August 25, 2019, 4:50pm UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/3 "2019-08-25T16:50:01Z")
Rear differential whine, maybe. Check the fluid level, check the magnetic fill plug for trash, then drain it and search for metallic bits. Inspect the gears for wear, bearings for free play, refill and cross your fingers it goes away. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [August 25, 2019, 7:23pm UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/4 "2019-08-25T19:23:02Z")
Good ideas above. I’m guessing either the differential fluid level is low or the wrong spec, or a problem with the rear brakes. If the rear differential fluid level is now low or has ever been low for an extended time, given the wheel bearing clue, you may be looking at needing a major rear axle service job. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [August 25, 2019, 7:31pm UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/5 "2019-08-25T19:31:24Z")
It could be as simple as old and noisey tires This has fooled many people into replacing parts needlessly How old are the tires, and how much tread depth is remaining . . . ?! ---
**Author:** ![sj.raymond\_156661](https://avatars.discourse-cdn.com/v4/letter/s/ccd318/32.png) [@sj.raymond\_156661](https://community.cartalk.com/u/sj.raymond_156661)\ **Post date:** [August 26, 2019, 12:47am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/6 "2019-08-26T00:47:16Z")
No it doesn’t. ---
**Author:** ![sj.raymond\_156661](https://avatars.discourse-cdn.com/v4/letter/s/ccd318/32.png) [@sj.raymond\_156661](https://community.cartalk.com/u/sj.raymond_156661)\ **Post date:** [August 26, 2019, 9:26am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/7 "2019-08-26T09:26:21Z")
Rear tires are pretty warn, I’m going to estimate they’ve done about 20k miles. Still look in decent shape but yes the noise is pretty extreme though, I suppose it could be tire related but I’d be very very surprised if it caused this much noise. It started probably when I had about 10k miles on the tires only so It would be pretty crappy if it was the cause of it. ---
**Author:** ![sj.raymond\_156661](https://avatars.discourse-cdn.com/v4/letter/s/ccd318/32.png) [@sj.raymond\_156661](https://community.cartalk.com/u/sj.raymond_156661)\ **Post date:** [August 26, 2019, 9:27am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/8 "2019-08-26T09:27:10Z")
I’m going to take a look at the diff fluid asap yes. Thanks ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [August 26, 2019, 2:09pm UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/9 "2019-08-26T14:09:28Z")
did you have a shop do the rear bearings? noise went away. alot? and came back. hmm, ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [August 26, 2019, 11:31pm UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/10 "2019-08-26T23:31:15Z")
How old are the tires . . . ? What brand . . . ? I hate to say it, but if they’re Firestone, and they’re already a few years old . . . that might very well be the cause of the noise I’m speaking from some experience here . . . ---
**Author:** ![sj.raymond\_156661](https://avatars.discourse-cdn.com/v4/letter/s/ccd318/32.png) [@sj.raymond\_156661](https://community.cartalk.com/u/sj.raymond_156661)\ **Post date:** [August 27, 2019, 4:46am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/11 "2019-08-27T04:46:53Z")
Tires definitely less than 2 years old maybe 20-22k miles tops Continental Pro Contact ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [August 27, 2019, 4:51am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/12 "2019-08-27T04:51:09Z")
thanks for the information ---
**Author:** ![tom418](https://avatars.discourse-cdn.com/v4/letter/t/da6949/32.png) [@tom418](https://community.cartalk.com/u/tom418)\ **Post date:** [August 27, 2019, 10:56am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/13 "2019-08-27T10:56:00Z")
Exactly. My Toyota Celica was making noises in the rear. I thought I was looking at a worn pinion or ring gear in the differential. It was time to rotate tires, after I got done, noise was coming from the front! ---
**Author:** ![sj.raymond\_156661](https://avatars.discourse-cdn.com/v4/letter/s/ccd318/32.png) [@sj.raymond\_156661](https://community.cartalk.com/u/sj.raymond_156661)\ **Post date:** [August 28, 2019, 4:58am UTC](https://community.cartalk.com/t/2009-e350-mercedes-high-pitched-noise-coming-from-rear-of-car/147439/14 "2019-08-28T04:58:56Z")
Unfortunately I can’t rotate the tires front / back. 2 difference sizes