S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Power steering malfunction

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Old Feb 28, 2021 | 05:56 PM
  #1  
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W221 S class 550
Power steering malfunction

2011 Mercedes s550 4matic

Power steering malfunction see owners manuel is on the dash...what is this about? Anyone I checked the steering reservoir it dry on the dip stick. I filled it up..the steering malfunction went away for a few seconds and came back.....the steering is still hard to turn.



Last edited by Cuzzo; Feb 28, 2021 at 07:43 PM.
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Old Mar 1, 2021 | 08:35 AM
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'71 Pinto
Clear code if it returns steering angle sensor “may” need replacement.


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Old Mar 1, 2021 | 10:36 AM
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S500
u need to understand the fluid loss...

I guess its ABC car, these need regular servicing with fluid and filter changes or the dampers wear our (with the debris causing seal damage), if its ABC the power steering and the ABC share the same reservoir and I think pump
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Old Mar 1, 2021 | 10:45 AM
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'71 Pinto
Not ABC per VIN.
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Old Mar 3, 2021 | 02:49 AM
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2010 MB S550, 2017 MB SLC 300
It sounds like the system needs to be bled. Clear the code and then clock the steering wheel from left to right, lock to lock. Check the fluid and add as needed, repeat.
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Old Apr 20, 2021 | 08:38 PM
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W221 sclas
When this happened it was electric power steering pump gone bad also check the fuse
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Old Apr 20, 2021 | 11:50 PM
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2010 MB S550, 2017 MB SLC 300
The PS is electric? Not Hydraulic?
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Old Apr 21, 2021 | 05:17 AM
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W221 sclas
Its combination of both. You should be able to hear the pump motor working when you turning the wheel. It felt harder then usual then just went bad out of nowhere while doing 80 mph on the highway
hopefully its a fuse in your case because that pump costs 2.5k
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