Codes 2A94 and 3100 This Morning

JStang · 04-30-2014, 07:23 AM

I was cruising at about 50 in 4th gear this morning on my way to work when all of a sudden I get a reduced power warning. I check the code with my Cobb AP and 2A94 (Crankshaft sensor, signal missing) and 3100 popped up.

The car was stuck in gear and wouldn't change to D from M mode. I came to a light, cleared the code and the 2A94 went away but the 3100 remains. Car drove fine but I didn't try to get on it at all.

Any thoughts on what's causing these codes? First thing that comes to mind is the obvious which is a bad crankshaft sensor.

elmoose · 06-08-2014, 10:11 PM

What has the solution?

JStang · 06-09-2014, 09:43 AM

My bad for not updating this thread. It was a bad crankshaft sensor.

smoorebmw · 06-09-2014, 09:47 PM

I got the same codes yesterday....ordered new sensor...not fun.

GetSomeE92 · 08-13-2014, 03:11 PM

Just had this happen to me. I got a transmission fault message as well as a reduced power engine malfunction message in iDrive. I was able to clear the 2A94 code right away. After turning the car off and locking it for a few minutes I was able to clear the 3100 code. Car seems fine now.

@JStang Where did you get the crankshaft sensor and did you install it yourself or take it somewhere?

JStang · 08-13-2014, 08:31 PM

Quote:

Originally Posted by GetSomeE92

Just had this happen to me. I got a transmission fault message as well as a reduced power engine malfunction message in iDrive. I was able to clear the 2A94 code right away. After turning the car off and locking it for a few minutes I was able to clear the 3100 code. Car seems fine now.

@JStang Where did you get the crankshaft sensor and did you install it yourself or take it somewhere?

If your case is anything like mine, the code will be back. I took it to my Indy. Good luck!

GetSomeE92 · 08-13-2014, 08:33 PM

Quote:

Originally Posted by JStang

If your case is anything like mine, the code will be back. I took it to my Indy. Good luck!

Thanks for the reply, bud. I found a DIY and it looks pretty simple so I'll just order the part and replace it if it comes back.

GetSomeE92 · 08-14-2014, 09:03 AM

Quote:

Originally Posted by JStang

If your case is anything like mine, the code will be back. I took it to my Indy. Good luck!

You were right. Happened again this morning while driving to work. The iDrive went nuts with error messages. I ordered a new sensor and hope it gets here sooner than the shipping estimate.

Beyondcr · 11-20-2014, 08:43 AM

Crankshaft sensor did the trick. Thanks! Just a tip, don't try to pull the sensor from the bottom, it's to hard to get the right angle.

04-30-2014, 07:23 AM	#1
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	Codes 2A94 and 3100 This Morning I was cruising at about 50 in 4th gear this morning on my way to work when all of a sudden I get a reduced power warning. I check the code with my Cobb AP and 2A94 (Crankshaft sensor, signal missing) and 3100 popped up. The car was stuck in gear and wouldn't change to D from M mode. I came to a light, cleared the code and the 2A94 went away but the 3100 remains. Car drove fine but I didn't try to get on it at all. Any thoughts on what's causing these codes? First thing that comes to mind is the obvious which is a bad crankshaft sensor.
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06-08-2014, 10:11 PM	#2
elmoose New Member 0 Rep 5 Posts Drives: 2008 335i Join Date: Mar 2014 Location: United States iTrader: (0)	What has the solution?
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06-09-2014, 09:43 AM	#3
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	My bad for not updating this thread. It was a bad crankshaft sensor.
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06-09-2014, 09:47 PM	#4
smoorebmw Private First Class 57 Rep 120 Posts Drives: F10 M5 - F80 M3 (GF's) Join Date: Nov 2012 Location: San Diego iTrader: (0)	I got the same codes yesterday....ordered new sensor...not fun. __________________ 2013 BMW M5 - B&O Sound - Piano Black trim - 2 toned grey/black interior. 2016 M3 - Fully Loaded - GF's car Grave Yard - 2014 BMW 640i - 2007 BMW 335i - 2006 BMW M5 - 2003 Infinti G35 - 2002 BMW 740i - 2002 CBR 954r - 2000 BMW 540i - 2000 BMW 328i
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08-13-2014, 03:11 PM	#5
GetSomeE92 Major 36 Rep 1,176 Posts Drives: '09 Space Gray E92 Join Date: Mar 2011 Location: Miami, FL iTrader: (7)	Just had this happen to me. I got a transmission fault message as well as a reduced power engine malfunction message in iDrive. I was able to clear the 2A94 code right away. After turning the car off and locking it for a few minutes I was able to clear the 3100 code. Car seems fine now. @JStang Where did you get the crankshaft sensor and did you install it yourself or take it somewhere? __________________ 335i Coupe, JB4 (G4, map 5) DCI and 40% E85 blend: 2009 BMW 335i Coupe: 12.173 @ 109.490 MPH
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11-20-2014, 08:43 AM	#9
Beyondcr Registered 0 Rep 2 Posts Drives: 17 M240i Join Date: May 2013 Location: york pa iTrader: (0)	Crankshaft sensor did the trick. Thanks! Just a tip, don't try to pull the sensor from the bottom, it's to hard to get the right angle. Last edited by Beyondcr; 11-20-2014 at 08:51 AM..
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