4ca0 ошибка бмв

Drives: 335D M-Sport, X5D

Join Date: Apr 2018

Location: Maryland

Would anyone happen to know what could cause error code 4CA0 (oil pressure switch plausibility)?

I tried searching the M57 sub-forum and have not found any threads addressing this particular error code. When I scanned the ECU with the ProTool app, this was one of three error codes that came up (the other two are for the glow plug module and power management). The power management code has been there since I can remember and the glow plug module has been intermittent for the last 3k miles or so (I’ve already ordered a new module and will be replacing it shortly).

Per ProTool, it seems this 4CA0 code did not initially trigger the SES light and only occurred once about 800 miles ago.

Should this be something I should be worried about? Any suggestions on where this switch is located so I can see if theres anything visibly wrong with it?

Drives: x5 35d e70 2011

Join Date: Sep 2016

Location: NYC area

Power management could lead to sensors issues. I had a power management shorted code that said it was my fuel pressure sensor (x5) and it turned out to be another sensor that was bad. Look up the specifics of that code to find which bus it is.

It could even be the glow plug module if it’s on the same bus as that switch.

Drives: 335D M-Sport, X5D

Join Date: Apr 2018

Location: Maryland

The thing about the power management code (3EED Power Management, closed circuit) is that when I saw it previously, it was the only error and no others. Its been like for over a year, hence why I didn’t think it was related to the Oil Pressure switch code.

I tried researching the 3EED code when I first saw it and came up with nothing definitive. Since it wasnt causing an SES and everything seemed to work, I left it alone.

That being said, I’m still at a loss at how to approach either of the two codes as information on them seems to be very scarce.

EDIT:
To clarify, there are some threads mentioning the 3EED code but they seem to suggest that other codes are always present with it. In my case, 3EED was the only code stored until now. I’m not sure what to focus on right now. If power management can cause faulty sensor issues, then the oil pressure switch code could be misleading. The power management code itself doesnt seem to point to anything specific. And if we ignore the power management code, then I’m still in the dark on how to diagnose the oil pressure switch. Is this switch located on the oil filter housing or closer to the oil pan?

Drives: 2010 335D

Join Date: May 2018

Location: MD

Drives: 335D M-Sport, X5D

Join Date: Apr 2018

Location: Maryland

I was never able to resolve the 3EED code, but I dont think its an actual issue. I just bought an E70 X5D and it has the same code.

Regarding the 4CA0 code, I bought a new oil pressure switch and swapped it out. It’s located on the bottom of the oil filter housing, access to it isn’t that bad if you have the right tools. Here’s a RealOEM diagram showing its location/orientation: https://www.realoem.com/bmw/enUS/sho…diagId=11_2328

Unfortunately, replacing the switch did not resolve the issue. The code still comes back after some driving, but it does not trigger the SES light. I have the car parked for the winter for the time being, so I’ll probably get back on trying to resolve the code once it gets a little warmer.

Drives: 2010 335D

Join Date: May 2018

Location: MD

Drives: F31N 320d & E92 LCI 320d

Join Date: Apr 2018

Location: Liverpool

Found one solution to this, could be other issues such as broken wires but this is worth a check first. Thought I’d resurrect the thread, there’s not much out there for this code and it might help someone else.

I was also getting the same 4CA0 oil pressure switch plausibility code and after clearing it would quickly return and always next day it’d be there again. Tried a new switch, checked wiring and oil pressure with a pressure gauge with everything looking okay (2.5bar cold and 1.5bar at running temp)

The wire going to the oil pressure switch goes directly into the ECU which is expecting a short to ground when the engine is not running, this connection should go open circuit upon engine start when oil pressure is reached.

My initial investigative mistake was probing the ground strap on the oil filter housing where the pressure switch screws into, this was fine with ground present and only after checking everything and returning to this I noticed when the oil pressure switch was screwed in the ground was intermittent when I probed the switch itself and only if I move the grounding strap did I get continuity and this appears to be causing the ECU to flag up the switch fault.

It looks like whatever method to electrically connect the insert in the plastic oil filter housing which the pressure switch screws into and the grounding strap had failed (spot weld, perhaps physical contact during assembly) and over time contaminants or corrosion cause just enough resistance to flag the code but when the engine is running there’s enough vibration to retain connectivity for the code to go away for a bit after clearing, only to return as the engine cools and metal contracts.

Being a bit of a «messer» I added a single spot weld between the ground strap and insert (luckily they were both steel) then refitted the oil filter housing. Probing the switch I then saw proper connectivity to ground and the code had cleared itself when scanning in ista.

You could obviously just replace the oil filter housing with a new or good second hand unit.

Hope this helps someone.