Humming sound from the rear
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W212 e200
Humming sound from the rear
I have 2011 e200 with 150 miles, and now hearing some humming noise, not really sure if its from the rear its kind of coming from under the car. The noise is consistent at around 60mph and lower, I ruled out the bearings as i changed to new ones and new tyres. If I go 70+, I don't hear anything. And one more thing when I'm hearing that sound i tryed shifting to N humming sound is gone. Any ideas? Trans? Diff?
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I have 2011 e200 with 150 miles, and now hearing some humming noise, not really sure if its from the rear its kind of coming from under the car. The noise is consistent at around 60mph and lower, I ruled out the bearings as i changed to new ones and new tyres. If I go 70+, I don't hear anything. And one more thing when I'm hearing that sound i tryed shifting to N humming sound is gone. Any ideas? Trans? Diff?
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W212 facelift
I have 2011 e200 with 150 miles, and now hearing some humming noise, not really sure if its from the rear its kind of coming from under the car. The noise is consistent at around 60mph and lower, I ruled out the bearings as i changed to new ones and new tyres. If I go 70+, I don't hear anything. And one more thing when I'm hearing that sound i tryed shifting to N humming sound is gone. Any ideas? Trans? Diff?
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2010 E550, 273 Engine: 2012 S550, 278 Engine
I have 2011 e200 with 150 miles, and now hearing some humming noise, not really sure if its from the rear its kind of coming from under the car. The noise is consistent at around 60mph and lower, I ruled out the bearings as i changed to new ones and new tyres. If I go 70+, I don't hear anything. And one more thing when I'm hearing that sound i tryed shifting to N humming sound is gone. Any ideas? Trans? Diff?
Rubber housing allows bearing to move radially under different torque conditions and when you put your tranny to N the torque goes away and the bearing moves changing the angle at joint. This could be the reason why humming (vibration) stops.
There also are rubber flex disks at each end of the propeller shaft that over time develop cracks and can cause vibrations under torque.
Then, if the tranny mount sags it also changes the Propeller shaft angle and could lead to vibrations.
I would check the tranny mount first, flex disks second and then the propeller shaft center bearing. This bearing probably is fine but the rubber housing is not. I changed this bearing on my S550. The rubber housing had sagged about 1/8”. I think E-class has the same design.
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A lot of good advice given. Please say you don't put the car in Neutral at 60 mph!
WRT changing the tranny fluid, I would do that regardless if you don't know when it was last changed. Depending on whether you have the red or blue fluid (THEY ARE NOT INTERCHANGABLE!!!), you may be long overdue for a transmission service. Red fluid (ATF-134 or MB 236.14) should be changed around 40,000 miles and blue fluid (ATF-134FE or MB 236.15) should be changed around 70,000 miles. Figure around $600-$700 at the dealer, but a lot cheaper than a new transmission.
WRT changing the tranny fluid, I would do that regardless if you don't know when it was last changed. Depending on whether you have the red or blue fluid (THEY ARE NOT INTERCHANGABLE!!!), you may be long overdue for a transmission service. Red fluid (ATF-134 or MB 236.14) should be changed around 40,000 miles and blue fluid (ATF-134FE or MB 236.15) should be changed around 70,000 miles. Figure around $600-$700 at the dealer, but a lot cheaper than a new transmission.
Last edited by JettaRed; Aug 20, 2024 at 10:58 AM.
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W212 (212.065/276.820)
I had a similar symptom with my old W204. Light humming noise only in 7th gear and low RPM. It turned out to be a sign of worn engine/transmission mount. It might be worthy a try.
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W212 e200
A lot of good advice given. Please say you don't put the car in Neutral at 60 mph!
WRT changing the tranny fluid, I would do that regardless if you don't know when it was last changed. Depending on whether you have the red or blue fluid (THEY ARE NOT INTERCHANGABLE!!!), you may be long overdue for a transmission service. Red fluid (ATF-134 or MB 236.14) should be changed around 40,000 miles and blue fluid (ATF-134FE or MB 236.15) should be changed around 70,000 miles. Figure around $600-$700 at the dealer, but a lot cheaper than a new transmission.
WRT changing the tranny fluid, I would do that regardless if you don't know when it was last changed. Depending on whether you have the red or blue fluid (THEY ARE NOT INTERCHANGABLE!!!), you may be long overdue for a transmission service. Red fluid (ATF-134 or MB 236.14) should be changed around 40,000 miles and blue fluid (ATF-134FE or MB 236.15) should be changed around 70,000 miles. Figure around $600-$700 at the dealer, but a lot cheaper than a new transmission.
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MBWorld Fanatic!
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2010 E550, 273 Engine: 2012 S550, 278 Engine
One way to make sure is ask the dealer. Just give them the VIN and they will know. Also, your service manual should say what the fluid change interval is. 40 000 means red and 70 000 means blue like JettaRed already mentioned.
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I had a 2011 E350 and it had the red 40 000 mile fluid. You have a 5 speed box (never heard of such thing before) and as such it should be even older design so the red fluid would be the one.
One way to make sure is ask the dealer. Just give them the VIN and they will know. Also, your service manual should say what the fluid change interval is. 40 000 means red and 70 000 means blue like JettaRed already mentioned.
One way to make sure is ask the dealer. Just give them the VIN and they will know. Also, your service manual should say what the fluid change interval is. 40 000 means red and 70 000 means blue like JettaRed already mentioned.
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W212 (212.065/276.820)
On the 7G transmission (first one to use the blue oil as far as I know), you need to check your car data card for the Fuel Efficient (FE) torque converter and the A89 (REDUCED-FRICTION) option. They indicate your transmission uses the blue oil (ATF-134FE or MB 236.15). For the newer 9G transmissions I have no information.
