E90Post
 


Studio RSR
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > IBS and 30FF Codes Mystery



Reply
 
Thread Tools Search this Thread
      10-24-2019, 08:04 AM   #1
colman
Enlisted Member
United_States
3
Rep
35
Posts

Drives: E61 535xi MT, E90 335d
Join Date: Oct 2019
Location: Grand Rapids, MI

iTrader: (0)

Question IBS and 30FF Codes Mystery

Hello,

Every few days or so I will get a group of codes when I accelerate to get on the highway, in 4th gear. If I accelerate quicker, these codes typically do not show up and they never have shown up on WOT pulls.

The half engine light is gone after restarting the car.

30FF (Have yet to diagnose where the leak is)
2E83 - Coolant pump power - reduced operation
2E85 - BSD: coolant pump: Missing
2E98 - BSD: Alternator: Missing
2E8B - BSD: IBS: Missing

Sometimes I get a Map-Thermostat code as well.

Bad IBS? Water pump going out?

This issue has been intermittently occurring before and after MHD stage 1 flash

Thanks for the help!


2009 335xi E92, BMS charge pipe, Tial BOV, BMS DCI, MHD stage 1
Appreciate 0
      10-24-2019, 09:21 AM   #2
dpaul
Lieutenant Colonel
United_States
654
Rep
1,893
Posts

Drives: 2009 E90 335xi, 2011 E93 M3
Join Date: Dec 2012
Location: Boston

iTrader: (3)

You probably do not have a boost leak - 30FF is a result of the DME shutting off boost when the waterpump reports an error.

The BSD bus is a serial bus connecting water pump, alternator, oil level sensor, and the IBS (intelligent battery sensor) to the DME.

A fault in one BSD device can bring the whole bus down, resulting in communication errors with all the devices.

The fact that the fault is intermittent and only brought on under specific circumstances might be a useful clue but electrical problems can be difficult to troubleshoot. It could be a bad wire or/connector on one of the devices or the device itself. You could completely disconnect the oil sensor, IBS and even the alternator (the latter will stop the battery from charging) from the BSD bus without harm and see if the water pump error remains.

If I had to guess, it would be the water pump, given how often those things fail in the N54.
Appreciate 0
      10-24-2019, 10:02 AM   #3
colman
Enlisted Member
United_States
3
Rep
35
Posts

Drives: E61 535xi MT, E90 335d
Join Date: Oct 2019
Location: Grand Rapids, MI

iTrader: (0)

Quote:
Originally Posted by dpaul View Post
You probably do not have a boost leak - 30FF is a result of the DME shutting off boost when the waterpump reports an error.

The BSD bus is a serial bus connecting water pump, alternator, oil level sensor, and the IBS (intelligent battery sensor) to the DME.

A fault in one BSD device can bring the whole bus down, resulting in communication errors with all the devices.

The fact that the fault is intermittent and only brought on under specific circumstances might be a useful clue but electrical problems can be difficult to troubleshoot. It could be a bad wire or/connector on one of the devices or the device itself. You could completely disconnect the oil sensor, IBS and even the alternator (the latter will stop the battery from charging) from the BSD bus without harm and see if the water pump error remains.

If I had to guess, it would be the water pump, given how often those things fail in the N54.
Ah good to know about the 30FF. This issue has occurred without the water pump codes before but always includes the alternator code. I suppose it is an electrical problem I need to investigate.

I'm aware of the water pump issue and have prepared for that inevitability.

Thank you for the information!
Appreciate 0
      10-26-2019, 04:15 PM   #4
southbaysteve
New Member
2
Rep
9
Posts

Drives: Black 2009 E90/N54 (335i)
Join Date: Aug 2015
Location: Torrance, CA

iTrader: (0)

Great response!!

Quote:
Originally Posted by dpaul View Post
You probably do not have a boost leak - 30FF is a result of the DME shutting off boost when the waterpump reports an error.

The BSD bus is a serial bus connecting water pump, alternator, oil level sensor, and the IBS (intelligent battery sensor) to the DME.

A fault in one BSD device can bring the whole bus down, resulting in communication errors with all the devices.

The fact that the fault is intermittent and only brought on under specific circumstances might be a useful clue but electrical problems can be difficult to troubleshoot. It could be a bad wire or/connector on one of the devices or the device itself. You could completely disconnect the oil sensor, IBS and even the alternator (the latter will stop the battery from charging) from the BSD bus without harm and see if the water pump error remains.


If I had to guess, it would be the water pump, given how often those things fail in the N54.

What he said ^^ Couldn't ask for a better response on what to look for. The
30FF is a part of engine control to protect an overheat/low pressure on coolant for the engine. I'm chasing my real 30FF (I popped it WOT so likely stock charge pipe or stock intercooler supply side broke).
Hope you get it fixed!

Steve
Appreciate 0
      05-02-2023, 10:24 AM   #5
colman
Enlisted Member
United_States
3
Rep
35
Posts

Drives: E61 535xi MT, E90 335d
Join Date: Oct 2019
Location: Grand Rapids, MI

iTrader: (0)

Forgot to post the solution to my issue here.

These codes were due to a faulty voltage regulator on the alternator:

2E83 - Coolant pump power - reduced operation
2E85 - BSD: coolant pump: Missing
2E98 - BSD: Alternator: Missing
2E8B - BSD: IBS: Missing

The 30FF was due to wastegate rattle. I adjusted the rear wastegate by the threaded actuator rod, and the front wastegate with the washer method.

The thermostat code still comes on in the winter - it is failing in cold conditions and fails open so it takes forever for the car to warm up. This will be replaced with the waterpump soon.
Appreciate 0
Reply

Bookmarks

Tags
30ff, 335i, alternator, battery, codes, ibs, mystery, water pump 335i

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:54 PM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST