DME Code 12542: Exhaust fume turbo charger, high pressure side at high altitude???

Tronner · 11-21-2010, 06:12 PM

So I took the car up into the mountains for a snowboarding trip this weekend. In a 200 mile trip I got a 12542 code for Exhaust fume turbo charger, high pressure side 4 times!

It would also then throw a 12544 boost deactivation limp mode. I had to pull off I-70 in the mountains, pull out my computer, clear the codes, and drive again.

Here's the odd thing. All 4 times it happened at the highest altitude parts of the trip. 3 near the Eisenhower tunnel at over 10,500 feet I would guess, and one near the top of Vail pass at about the same. The car ran fine otherwise at all lower elevations.

Any ideas what would trigger this? I don't want to be scared to take the car up there, but if I didn't have my laptop I would have been in limp mode all the way back to Denver.

Mods are:
AR designs oil cooler
AMS front mount intercooler
AFE intake
Borla exhaust with catless race pipes
Vishnu Procede V4 w/ Autotune

Tronner · 11-21-2010, 06:24 PM

A little more info. Apparently this code is usually triggered from overboosting, but literally all 4 times it occurred I was barely even on the throttle, I don't believe I was even registering ANY boost or at least very little (under 5 psi). I was, however, going uphill in all 4 cases, and as I said they were all at very high elevation.

Hopefully Shiv will see this - seems like some odd, high altitude issue.

klipseracer · 11-21-2010, 07:55 PM

I've seen this before but I forget what the solution was... I just remember it seemed very simple. Sorry I can't help but hopefully the fact that I believe its a simple fix should be comforting. If I remember right, you got something on backwards.

Tronner · 11-21-2010, 07:57 PM

Haha, well I suppose that's a bit comforting - I hope you're right!

klipseracer · 11-21-2010, 08:24 PM

Quote:

Originally Posted by Tronner

Haha, well I suppose that's a bit comforting - I hope you're right!

Turn off lagfix. Its boost overtarget. I would also reload your maps/firmware and go back to more default settings and see what happens.

Tronner · 11-21-2010, 08:28 PM

Hmmm....I don't believe there is a lagfix on/off setting on my Procede. The weird thing is that these all happened at very low boost / low throttle. I suppose it still has a target at that point though.

forza1976 · 11-22-2010, 02:37 PM

Quote:

Originally Posted by Tronner

Hmmm....I don't believe there is a lagfix on/off setting on my Procede. The weird thing is that these all happened at very low boost / low throttle. I suppose it still has a target at that point though.

"barometric offset" is the setting you would turn on to compensate for high altitude. However shouldn't really need to set this to 1 with autotuning.

Tronner · 11-22-2010, 02:40 PM

Cool. I will turn it to off, but I assume that it has nothing to do with the code it's throwing?

OpenFlash · 11-22-2010, 03:03 PM

Quote:

Originally Posted by Tronner

Cool. I will turn it to off, but I assume that it has nothing to do with the code it's throwing?

Hi there-- Just tune baro compensation off (as per the default setting). It's not needed any more since autotuning takes care of it. Turning it ON can cause what you saw since it severely limits boost target which makes even slight throttle angles result in a perceived overboost. By overboost, I mean running 1psi when the target is -2psi

That should take care of things.

Shiv

Tronner · 11-22-2010, 03:15 PM

Quote:

Originally Posted by shiv@vishnu

Hi there-- Just tune baro compensation off (as per the default setting). It's not needed any more since autotuning takes care of it. Turning it ON can cause what you saw since it severely limits boost target which makes even slight throttle angles result in a perceived overboost. By overboost, I mean running 1psi when the target is -2psi

That should take care of things.

Shiv

Great. I hope that will take care of it. I'll turn it off and take another trip up to the tunnel sometime soon.

11-21-2010, 06:12 PM	#1
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	DME Code 12542: Exhaust fume turbo charger, high pressure side at high altitude??? So I took the car up into the mountains for a snowboarding trip this weekend. In a 200 mile trip I got a 12542 code for Exhaust fume turbo charger, high pressure side 4 times! It would also then throw a 12544 boost deactivation limp mode. I had to pull off I-70 in the mountains, pull out my computer, clear the codes, and drive again. Here's the odd thing. All 4 times it happened at the highest altitude parts of the trip. 3 near the Eisenhower tunnel at over 10,500 feet I would guess, and one near the top of Vail pass at about the same. The car ran fine otherwise at all lower elevations. Any ideas what would trigger this? I don't want to be scared to take the car up there, but if I didn't have my laptop I would have been in limp mode all the way back to Denver. Mods are: AR designs oil cooler AMS front mount intercooler AFE intake Borla exhaust with catless race pipes Vishnu Procede V4 w/ Autotune
	Appreciate 0 Tweet Quote

11-21-2010, 06:24 PM	#2
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	A little more info. Apparently this code is usually triggered from overboosting, but literally all 4 times it occurred I was barely even on the throttle, I don't believe I was even registering ANY boost or at least very little (under 5 psi). I was, however, going uphill in all 4 cases, and as I said they were all at very high elevation. Hopefully Shiv will see this - seems like some odd, high altitude issue.
	Appreciate 0 Quote

11-21-2010, 07:55 PM	#3
klipseracer Banned 219 Rep 3,012 Posts Drives: 2007 E90 335i, 05 E46 330i Join Date: Aug 2009 Location: Arizona iTrader: (27) Garage List 2007 335i [0.00] 2005 330i [0.00]	I've seen this before but I forget what the solution was... I just remember it seemed very simple. Sorry I can't help but hopefully the fact that I believe its a simple fix should be comforting. If I remember right, you got something on backwards.
	Appreciate 0 Quote

11-21-2010, 07:57 PM	#4
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	Haha, well I suppose that's a bit comforting - I hope you're right!
	Appreciate 0 Quote

11-21-2010, 08:28 PM	#6
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	Hmmm....I don't believe there is a lagfix on/off setting on my Procede. The weird thing is that these all happened at very low boost / low throttle. I suppose it still has a target at that point though.
	Appreciate 0 Quote

11-22-2010, 02:40 PM	#8
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	Cool. I will turn it to off, but I assume that it has nothing to do with the code it's throwing?
	Appreciate 0 Quote