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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Cobb Stage 2+ at track day - limp mode - 2ABC & 30FF codes



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      08-03-2012, 12:29 AM   #1
Glowin
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Cobb Stage 2+ at track day - limp mode - 2ABC & 30FF codes

So bummed out... My car's a 2008 E93 335 with only 25,000 miles on it. It has the sport package, so comes with the oil cooler. Most of them were tuned, so a week ago, I put in new spark plugs.

Then last week I had my AR Design catless DP's and an AMS intercooler installed at a shop, and flashed with the 2+ Aggressive maps. The power was amazing, though seeing 18 PSI did scare me a bit I have to admit. I ran the car for about a week, and did some WOT runs on the highway too, no problems. My only other mod is a K&N drop in filter. I run on 94 octane gas.

Then today I went for a track day, and literally after 5 laps, I got a limp mode. I pulled over and had these codes:

2ABC - Charging / boost pressure sensor, electric
30FF - Exhaust fume turbo low side
3100 - Boost pressure control, deactivation

I then ran it on a stock map for a session, and even with the check engine light on, the car still managed to boost 4 PSI or so consistently.
  • I'll have them check the FMIC piping too, since it was just installed, I'm hoping that's the problem. But could it cause a 2ABC code too?
  • From what I've been reading here, 2ABC a lot of people say could be the TMAP sensor. But I don't think the tech would have touched it for the installs? Is it something that can be tested, and if so, how?
  • What about the stock BPV's? Could they be the culprit? If so, how do you test them?
  • Or the chargepipe could be cracked?

Bloody hell...

What are your ideas what is causing this? Any thing I should do to eliminate some things? Thanks for any help.

PS It'll take me a few days before I can go in. In the meantime, I'm trying to lay off boost. Does driving the car if I do have a few PSI of boost cause any damage to something, like the turbos?

EDIT 8/28/12: It seems it's NOT a hardware issue... %$##@! See post below.
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Last edited by Glowin; 08-28-2012 at 02:04 PM.
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      08-03-2012, 01:56 AM   #2
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Sounds like a boost leak, but I'll let the pros chime in.
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      08-03-2012, 08:15 AM   #3
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Yeah, boost leak. Check your IC piping, since that was just recently done.

On track, monitor your oil and water temps closely. That much boost on a road course heats everything up severely. Take a cooldown or slow pace lap every few laps.
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      08-03-2012, 09:14 AM   #4
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take your engine cover off and look at those two lines closest to where u r standing, i had to replace all the tubes under there 2 times now,
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      08-03-2012, 11:41 AM   #5
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2ABC could also be a scaling error with the map sensor range. 30FF is a boost leak though.
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      08-03-2012, 12:04 PM   #6
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Regarding the 30FF- it could very well be caused by sticking wastegates due to the high heat of track sessions. Very common- it happens to most cars when it's their first time on the track. Definitely fish some oil down onto the wastegate linkages before you go hunting for boost leaks.
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      08-03-2012, 12:23 PM   #7
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Thanks guys for the tips. Oil temps didn't go above 250 during the sessions. This was not the first time on the track with the car. I've tracked it before on stage 1 maps (with the Procede though, which I guess capped boost around 13 PSI), and would go most of the day before getting a limp mode (which when I scanned, there were no codes, so I figured they were spark plug related misfires). This happened after a few laps, so I'm guessing the continued 16 to 18 PSI of boost caused issues a lot quicker.

I'm not sure how many E9X cars they've worked on (they do lots of work on previous gen. BMW's and race prep them even), so I want to chat with the tech and see what his plan is.

As far as this 2ABC code, so is it most likely related to the map sensor? Can it actually be tested to rule it out? Or it could be that once we fix whatever's causing the 30FF, it might not reappear, so we should tackle the 30FF first?

Now that the engine's cooled down, any damage I might cause if I start testing things again by doing a few WOT runs?
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      08-03-2012, 02:10 PM   #8
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I had similar issues on the track with 4.01 and an earlier version (2.something, cant remember). I would try the 4.02 maps and see how that works. If I had to guess, your wastegates are a little stiff for what the OTS maps can handle.
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      08-03-2012, 02:22 PM   #9
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I was on the latest 4.02 maps, linear throttle... Would using the Drive map help at all? Come to think of it, I tried that, and still got the limp mode, as well as even flashed to Stage 0 and it still happened.

Does that still make sense it could be the wastegates? If it was, then why would it happen in stock mode too? And why not a few months ago when I tracked the car with the Procede?
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      08-03-2012, 08:06 PM   #10
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So how can I test the BPV's and the map sensor, to rule them out as culprits?
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      08-06-2012, 03:50 PM   #11
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http://www.n54tech.com/forums/showthread.php?t=13114

Boost Leak Test.
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      08-06-2012, 06:18 PM   #12
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Quote:
Originally Posted by ETS Michael View Post
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      08-14-2012, 12:16 PM   #13
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Thanks guys for that amazing DIY, though I'm neither that mechanically inclined nor do I have the time to try it... I was away last week on a trip, so I'll be taking it in to the shop to see.

I hope it's a simple issue with the FMIC install I had done just before this code, and not the turbos (which I saw were one of the last possible options if you can't find a leak)... If it was my turbos in fact, there would be other codes / obvious signs? I don't want to freak out too early! My car's only got 25,000 miles on it, and saw two track days before this event!

I've driven the car for a day off boost, and got no codes. Then I went for a drive last night on the highway, and slowly eased onto boost, in 3rd gear. Got up to 5 PSI once, then backed off, did it again, at 6 PSI, got the 30FF code.

Can I at least eliminate the turbos as being a problem if they've boosted a couple of times? That's freaking me out!
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      08-14-2012, 01:33 PM   #14
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Maybe you have bad wastegate solenoids. Terry@BMS created a thread on a test for that with vacuum line and a boost gauge.
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      08-28-2012, 02:03 PM   #15
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So last night, I had the car up on ramps to check the FMIC connections, which is all I can do myself, and all seemed good, so I gave up. I booked an appointment for next week to get it checked out at the shop, and thought to take one more highway run and see at what level of boost the code shows up.

To my surprise, I got none! WTF? I ran WOT in 3rd a few times even, got up to 18 PSI registering on the AP, and no codes at all. For days after the track session, I was throwing codes right when I hit 5 PSI, so it wasn't just at the track or right after, so I'm totally puzzled by this.

So I guess it's not a hardware problem then. Which is good news and bad news. What really sucks, is how hard it's going to be to troubleshoot the issue now...

Another member told me his car would just not get along with the Cobb on the track, due to the inability to compensate for stiffer wastegates or something like that, and he ended up switching to the Procede in the end... I'm wondering if that's my issue too?

I'd hate to go to another track day, only to get a limp mode after a few laps.

Anyone have any more tips how I can figure this out? I'll get in touch with Cobb too...
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      08-28-2012, 02:20 PM   #16
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to me sounds like your sensor is toast or as themyst said scaling is wrong.
Try to uninstall the cobb completely and see if you get the same codes again.
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      08-28-2012, 02:36 PM   #17
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So you think the TMAP sensor is what caused the issue in the first place, as well as the 30FF boost leak code? But if that's the case, the wierd thing is that for the week after the track session, I kept getting the 30FF codes repeatedly, and not the 2ABC ones, so if it was in fact the TMAP, why would it not keep throwing codes?

Is there a way to test the TMAP anyway?

And at this point, wouldn't it be better to see if I can throw the code again WITH the Cobb installed (now that I'm not throwing it anymore), and then if it happens, uninstall it and see if it keeps happening?
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      06-29-2013, 04:02 PM   #18
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      06-29-2013, 06:54 PM   #19
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Quote:
Originally Posted by Glowin View Post
So you think the TMAP sensor is what caused the issue in the first place, as well as the 30FF boost leak code? But if that's the case, the wierd thing is that for the week after the track session, I kept getting the 30FF codes repeatedly, and not the 2ABC ones, so if it was in fact the TMAP, why would it not keep throwing codes?
Dude...it could be some of those things, it could be all of those things, or it could even be none of those things. No one is gonna know until your start eliminating variables for us to try and narrow down the problem. If you can't do any of the tests, already posted, yourself then take it back to the shop and pay them to figure it out.
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      05-18-2015, 09:00 AM   #20
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Was this issue ever fixed? I was at the track yesterday and pulled the same codes on a Cobb 2+.
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      05-18-2015, 09:27 AM   #21
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Been on the track plenty times with Cobb OTS maps. My guess boost leak, esp since you have a stock charge pipe.

Something is up tho man.

Check your boost solenoid.

You gotta go thru the trouble shooting methods first. Your car is fine it just needs to get that problem fixed
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      05-18-2015, 12:02 PM   #22
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Quote:
Originally Posted by davidwarren View Post
Was this issue ever fixed? I was at the track yesterday and pulled the same codes on a Cobb 2+.
Never came back, as per my post on 8/28/12. Did a track day after too, and was fine. So odd.
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