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  #1  
Old 04-14-2018, 10:37 PM
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Help with code 28A0 on N55

Im getting the code 28A0 “intake pipe absolute pressure, plausibility: pressure too high” and looking for some troubleshooting help. I’m also getting a 2820 shadow code, “absolute pressure sensor, intake pipe”. I’ve already taken off my chargepipe, throttle body, and MAP sensor to clean. Don’t see any cracks or anything obvious and still having no luck. Truck starts fine but idles rough. Code points to possible MAP or throttle body malfunction....anybody experience this before? Also found something about the evap purge valve could be faulty, but don’t know if it would throw this code specifically. I have a friend coming with Rheingold to reset some adaptations to see if that helps anything. Any help in the meantime would be appreciated.

Last edited by ASquared; 04-14-2018 at 10:46 PM.
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  #2  
Old 04-15-2018, 12:58 AM
ard ard is online now
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Id replace the MAP sensor. Its only $100 or so.
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Old 04-15-2018, 01:44 AM
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Yea I’m likely to start there. I’m also reading into the N55 PCV valve issues along with the main seals. I’m getting a clattering, ticking sound upon starting other than the normal injectors and lifters. There is also a gap between my front crank seal and the end crank plate. Wondering if that’s causing vacuum issues as well which is giving a code for too much pressure.
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Old 04-17-2018, 11:00 AM
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hey i have the same codes on my n55 335i, i also have a n55 x5 with no codes. i swapped the map sensor on the charge pipe, but the code didn't go away. did you figure it out yet?
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Old 04-17-2018, 11:22 AM
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Quote:
Originally Posted by Racermp View Post
hey i have the same codes on my n55 335i, i also have a n55 x5 with no codes. i swapped the map sensor on the charge pipe, but the code didn't go away. did you figure it out yet?
Well yeah to a degree I think I know whatís going on. My serpentine belt shredded as I was pulling into my house when this all began. Luckily wasnt going fast at all but it seems to had been enough to break through the crankshaft seal. Itís currently at a friends shop now for oil pan removal to get any pieces out. The truck started fine but after a few seconds it would get the oil ticking noise. Couple people told me it sounds like oil starvation as well which correlated that some of the belt is probably clogging the oil pump pick up tube. Makes sense so I had it towed to the shop without starting it anymore to limit further damage.

Before coming to this likely conclusion, my buddy came with rheingold and it offered various things to check. Sensors were obvious ones, checking the throttle body was another. I had already done that. But my leak and variation in pressure is likely from the crank seal. A clogged PCV valve was also something it mentioned you could look into, but that unfortunately requires changing the whole valve cover as itís built in there on the N55. In extreme cases, I came across people that had bearing caps failing on their camshaft, but that guy was over 100k and mentioned lack of oil changes. I mean I bought my X5 used and only has 57k on it now, canít imagine it would be that extreme especially since I got the code right after my belt snapped.

How exactly did yours start? What symptoms were you having? Any other codes being thrown?
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  #6  
Old 04-17-2018, 11:26 AM
ard ard is online now
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If you wanna be paranoid....

2012 35I Code 28A0 throttle angle/intake pressure - Bimmerfest - BMW Forums

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  #7  
Old 04-17-2018, 11:35 AM
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Originally Posted by ard View Post
Yeah thatís the link I was referring too. This has got to be a super extreme case which involved poor maintenance. Iíve read also that all some people had to do was reset their throttle adaptations and that same exact code never appeared again. Guess itís just a wide spectrum of what it could be exactly.
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  #8  
Old 04-17-2018, 06:17 PM
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Quote:
Originally Posted by ASquared View Post
Well yeah to a degree I think I know whatís going on. My serpentine belt shredded as I was pulling into my house when this all began. Luckily wasnt going fast at all but it seems to had been enough to break through the crankshaft seal. Itís currently at a friends shop now for oil pan removal to get any pieces out. The truck started fine but after a few seconds it would get the oil ticking noise. Couple people told me it sounds like oil starvation as well which correlated that some of the belt is probably clogging the oil pump pick up tube. Makes sense so I had it towed to the shop without starting it anymore to limit further damage.

Before coming to this likely conclusion, my buddy came with rheingold and it offered various things to check. Sensors were obvious ones, checking the throttle body was another. I had already done that. But my leak and variation in pressure is likely from the crank seal. A clogged PCV valve was also something it mentioned you could look into, but that unfortunately requires changing the whole valve cover as itís built in there on the N55. In extreme cases, I came across people that had bearing caps failing on their camshaft, but that guy was over 100k and mentioned lack of oil changes. I mean I bought my X5 used and only has 57k on it now, canít imagine it would be that extreme especially since I got the code right after my belt snapped.

How exactly did yours start? What symptoms were you having? Any other codes being thrown?
Hey thanks for the info. Ha same issue. I thought I had fixed the ofhg, a few weeks later the belt shredded. I did a scope inside the timing chain to crank, no belt inside. Drained oil a few times and just a few tiny belt bits came out initially, but all clear now in the filter and drained oil.

Car has good oil pressure at all rpms, sounds good and drives good so far.

Damn I hate this car....

I try swapping the maf and map on the intake manifold, if that doesn't work, I'll just trade it in I guess
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  #9  
Old 04-17-2018, 07:52 PM
ard ard is online now
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As the model ages, and people trade in time bombs- it might not be shocking if new BF owners wind up buying these disasters....
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  #10  
Old 04-21-2018, 08:38 AM
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Update so far, I've swapped maf and intake pipe map, no luck. Next I'll swap the map sensor on intake manifold.
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