n55 Boost solenoid Failing?

Brett Krehling · 07-31-2018, 07:06 PM

Hey guys recently i have been having issues with my car over boosting and going into limp mode. codes are 2c56 and 2c58 both are related to charging pressure control. Let me start by saying my car is a 2011 135i dct. Ive already replaced all the plugs coils and even the HPFP. The car is stock besides a charge pipe and catless downpipe. Ive been dealing with limp mode going wot in 4th gear and up. Ive did some monitoring on mhd and realized im hitting up to 20 psi! i should only be hitting 9. So ive been searching and ive read something about the boost solenoid and the vacum lines connecting to it? I Inspected my car and The lines connecting to solenoid look like they have seen better days. Before i go ahead and replace the boost solenoid i was hoping someone could give me some insight?! Has anyone had this issue before? Car does not go into limp mode at all regular driving only when step on it in a higher gear.

HyeWarrior · 07-31-2018, 08:25 PM

Which chargepipe do you have?

Does it have meth bungs with a screw in it? Check if one of them fell out. That recently happened to me and kept sending me into limp mode

Brett Krehling · 08-01-2018, 02:54 PM

Update ! replaced my Boost solenoid and fixed my issues! No more limp mode and no more overboost.

HyeWarrior · 08-01-2018, 03:30 PM

Quote:

Originally Posted by Brett Krehling

Update ! replaced my Boost solenoid and fixed my issues! No more limp mode and no more overboost.

Good to hear!! I think I'm gonna have to be doing it sooner rather than later

captain slowly · 08-08-2018, 05:52 PM

how many miles on your car?

Dat Aus · 08-09-2018, 08:53 AM

Quote:

Originally Posted by HyeWarrior

Good to hear!! I think I'm gonna have to be doing it sooner rather than later

For how cheap they are, there really is no reason not to do it as preventative maintenance.

Quote:

Originally Posted by captain slowly

how many miles on your car?

For what it's worth, I did mine last night. My car is a 2008 with 163,000 km on it (102,000 miles). I was getting a 30FF low boost code maybe once every 4 weeks or so when going WOT. Other than that, they had no signs of failure.

07-31-2018, 07:06 PM	#1
Brett Krehling New Member 16 Rep 20 Posts Drives: 2011 Bmw 135i Join Date: Jun 2018 Location: Pennsylvania iTrader: (0)	n55 Boost solenoid Failing? Hey guys recently i have been having issues with my car over boosting and going into limp mode. codes are 2c56 and 2c58 both are related to charging pressure control. Let me start by saying my car is a 2011 135i dct. Ive already replaced all the plugs coils and even the HPFP. The car is stock besides a charge pipe and catless downpipe. Ive been dealing with limp mode going wot in 4th gear and up. Ive did some monitoring on mhd and realized im hitting up to 20 psi! i should only be hitting 9. So ive been searching and ive read something about the boost solenoid and the vacum lines connecting to it? I Inspected my car and The lines connecting to solenoid look like they have seen better days. Before i go ahead and replace the boost solenoid i was hoping someone could give me some insight?! Has anyone had this issue before? Car does not go into limp mode at all regular driving only when step on it in a higher gear.
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07-31-2018, 08:25 PM	#2
HyeWarrior Major 747 Rep 1,119 Posts Drives: 2012 135i DCT Join Date: Aug 2010 Location: San Dimas, CA iTrader: (1)	Which chargepipe do you have? Does it have meth bungs with a screw in it? Check if one of them fell out. That recently happened to me and kept sending me into limp mode
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08-01-2018, 02:54 PM	#3
Brett Krehling New Member 16 Rep 20 Posts Drives: 2011 Bmw 135i Join Date: Jun 2018 Location: Pennsylvania iTrader: (0)	Update ! replaced my Boost solenoid and fixed my issues! No more limp mode and no more overboost.
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08-08-2018, 05:52 PM	#5
captain slowly I like turtles! 726 Rep 698 Posts Drives: '21 M2C 6MT Join Date: Feb 2017 Location: Long Island, NY iTrader: (0)	how many miles on your car?
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