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Old 09-26-2009, 06:45 AM   #1 (permalink)
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Date registered: Sep 2009
Posts: 3
2005 ML500 power steering whining noise.

hey guys i'm new to forum, i have couple questions, first ML500 power steering whines a lot, i mean it would whine just standing still and turn little bit of steering wheel, it will start to whine very loud. i heard there are new design pump that will actually make it really quiet, is this true?

thanks in advance.
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Old 09-26-2009, 08:55 AM   #2 (permalink)
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Date registered: Aug 2002
Vehicle: Black 2005 ML 500
Location: Galveston, TX
Posts: 1,662
There are several level of fixes, and there are many posts describing all the steps. One fix is to change the reservour screen, others add the official Mercedes additive Lubrizol or other additive, and all have different degrees of success.

The ultimate case is getting the updated power steering pump, and making sure the dealer or mechanic performs the air removal procedure..

My former 2001 ML 320 and my current 2005 ML 500 where very loud whiners until my power steering pump was changed to the latest part number and the air removal procedure performed. Now there is zero whine and only hear the V8 engine purr at low or higher revs...

There is a known design issue with the original power steering pumps, which causes them to begin whining loud. More even after they have a power steering hose incident and lose their power steering fluid.

Same as the engine valve noise, some people had very loud valve noises and the dealers say that is normal. Mine does not have engine valve noise (82,000 miles), after an engine head rebuild caused by an engine head defect at around 4,000 miles, and now I would have to open the hood and remove the engine plastic cover to clearly hear the valving sounds. Though valve noise is common, excessive valve noise is not and can indicate sludge in the engine, which is a very common problem in 2001 and earlier engines, or some other issue/tuning.. I do flush my oil regularly, though, to remove any sludge from my engine like I have done to all my engines.

2005 ML 500
Black, 18" AMG Wheels, 285/60R18 Yokohama Geolander HTS + Bi-Xenons(+ Drew's e-code mod, though the reflectors rusted off and do not give out much light anymore), Yakima roof bars, Akebono pads all around. Former vehicle 2001 ML 320 with 108K miles, when traded, and a large repair/defect history. After all these years of owning my current 2005 ML 500, it is a major unreliable vehicle with a very large/expensive repair/defect history and has been like this since brand new.

Last edited by AC_ML; 09-26-2009 at 08:58 AM.
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Old 09-26-2009, 09:36 AM   #3 (permalink)
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Date registered: Sep 2009
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do u have new part number for the pump? or where can i found this newer pump? how much does it cost around?
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Old 09-26-2009, 10:13 AM   #4 (permalink)
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Date registered: Jun 2006
Vehicle: ML-55 - 2000,
Location: Spring, TX
Posts: 795
Originally Posted by icedenali View Post
do u have new part number for the pump? or where can i found this newer pump? how much does it cost around?
Please do not shoot for the pump staight away. Replace the reservoir first and follow the correct bleeding procedure. If whine persist try using Lubrisol. These two took care of mine...
Search here for bleeding instr. and lubrisol...
If these dont work then think abt the pump.
AMG 19X9.5 Wheels,
Stock AMG 18X8.5 Wheels
Yokohama Advan S/T 295/45/19 Tires,
Bridgstone Dueller 285/50/18
SCHATZ Chrome Rear hatch handle,
SCHATZ Chrome Headlight Trim
Chrome AMG License Frame,
SCHATZ Chrome Side Light Surrounds,
German Howell Chrome Door Lock Surrounds,
German Howell Chrome Indash Air vent surrounds,
AMG Stem Valve Caps
LED Tail Lights
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Old 09-28-2009, 12:04 AM   #5 (permalink)
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Date registered: Apr 2008
Posts: 5
Check your power steering fluid first before you go further. If it is low, top it up first. Check for the leak usually on the high presure side.
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