Sean._.S

Update: Took it to our trustworthy Mercedes Mechanic & was told it is most likely the ABC Pump... (I asked why it changes with RPM & was told both the Power Steering & ABC system are powered by the Engine.) As someone with previous experience with faulty ABC pumps, this is far from good. It still works fine but It will go out soon... Should I bite the bullet and replace it now or replace it further down the road? I think the obvious answer is go ahead and replace it but I would like some input from others. Has anyone replaced their ABC pump before? Not sure if I should let the Mechanic take care of it if I could do the work myself.

Katie22

Yes I replaced my ABC pump.. The cost was between 2 and 3 thousand. All is well now.

Sean._.S

What I can't quite figure out is if the ABC pump is belt driven, why is the sound coming from the rear left? Could it possibly be a single strut? When I look at both rear struts there isn't a single drop of fluid on them which makes me think otherwise...

PatentLawyer

It is belt driven but makes noise in the rear of the car? Count me confused, too.

Katie22

To refresh when my ABC pump needed replaced I was convinced that the transmission was making the noise. Even a mechanic at a independent shop felt it was the transmission. Apparently the cars acoustics allow sounds appear in placed they are not.

I can say one thing that the mechanic at the Mercedes dealer told me when I picked up my car. He suggested I should have removed the belt briefly and ran the engine and checked if the noise was gone.

Katie

SW20S

When you run up higher RPMs the pump gets more power and the output changes, thats why the whining sound goes up and down with RPMs.

MBNUT1

Thank you for posting the update. This is helpful information. This implies that your car has MBC correct?

DaveW68

When the ABC pump failed in my S600 back in 2017, the pump was $2225 (after core charge), the labor was $900 (agreed rate with warranty plan), and Hydraulic oil was $65. All in with tax was around $3400.

I'd be making darn sure that this is the actual cause of the noise before spending any money on it as most dealers don't have a problem spending other people's money trying to chase down noises. If it's under a MB warranty, then by all means let them try this.

My S600 had 47k on the odo when this happened. What is your current mileage?

Sean._.S

I took it in for the 40,000 mile service as it just hit 40,000 miles... Quite sad it failed so early... I found a New oem ABC pump for the W222 on the Mercedes official parts website for only $1310... I'm currently researching what all I would need to replace & where I should get the parts; Will most likely replace it myself as it doesn't seem too difficult.

Sean._.S

Yes it does have MBC... Hoping & praying there wont be any more issues. haha

DaveW68

That system is under very high pressure. My guess is that STAR will be needed to depressurize the system prior to pump replacement. You may want to leave that job to the dealership or another shop specializing in German cars.

Sean._.S

That's the only roadblock I've come across so far. Hoping to find a remedy soon.

MBNUT1

Hopefully Konigstiger will provide the WIS for the pump replacement.

Katie22

I have WIS and I looked at the process of replacing the pump and it required the Star scan tool as part of the replacement process. If my memory serves me correctly the scan tool is used to cycle the system repeatedly to clear air our of the lines.

Nice Ride

Nice Ride

GO TO 3.59

aka$h

@Sean._.S Did you ever get to the bottom of this noise. Got the same issue, thought it might be a fuel pump but that’s on the opposite side to the noise.