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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 > 2AAF code - any reason to worry?



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      12-04-2009, 06:05 PM   #1
SteveMD
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2AAF code - any reason to worry?

2AAF

I looked around and couldn't find much on this one but it is a Fuel Pump code.

It's the only shadow code thrown.

No long cranks and no other codes.
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      12-04-2009, 06:16 PM   #2
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that comes up if you change chip or disconnect jb3 with the battery on. nothing to worry about.
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      12-04-2009, 06:19 PM   #3
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Hmm...well I did neither but ok.

I'll erase and check again.

Been running map 5 for a few weeks on a stock car with 93 octane. That was the only code.
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      12-04-2009, 06:22 PM   #4
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Maybe your fuel pump is going.
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      12-04-2009, 06:41 PM   #5
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nope that code is the fuel pump plausability . comes up when there is a signal interruption. i always got it when i disconnected the jb3 during chip change.
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      12-04-2009, 06:43 PM   #6
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Quote:
Originally Posted by enrita View Post
nope that code is the fuel pump plausability . comes up when there is a signal interruption. i always got it when i disconnected the jb3 during chip change.
Thats good. Funny, that I didnt really know what a fuel pump was until I got my 335. Now I know what it is, how it works and the various hidden ecu codes that it can display.
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      12-04-2009, 07:23 PM   #7
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I got the same code once and Terry said it's common even on stock cars.
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      12-05-2009, 08:25 AM   #8
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Quote:
Originally Posted by SteveMD View Post
2AAF

I looked around and couldn't find much on this one but it is a Fuel Pump code.

It's the only shadow code thrown.

No long cranks and no other codes.
You didn't look hard enough. It is listed in the codes list Mr. 5 posted http://www.e90post.com/forums/showthread.php?t=264464
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      12-05-2009, 10:11 AM   #9
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Quote:
Originally Posted by quattr0 View Post
You didn't look hard enough. It is listed in the codes list Mr. 5 posted http://www.e90post.com/forums/showthread.php?t=264464
I did see that and I wasn't happy with 'Short Circuit or whatever diagnosis is given in it.. I wanted to know what caused it. Here is the real answer:
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      12-05-2009, 11:33 AM   #10
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Looks like you found you're answer.....FYI I posted this in one of the fuel pump dying threads.
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Originally Posted by turboawdfanatic View Post
The 2AAF in and of itself is not a HPFP code nor is it specific to tuned cars...as it is thrown on completely stock cars as well. Here's some good info on 2AAF. But basically if it does not cause drivability issues or is not thrown with other codes, then BMWNA's stance is that it is left alone.

http://www.bmwtis.com/tsb/bulletins/...p/B130509g.htm

http://www.bmwtis.com/tsb/attachment...fault_tree.pdf
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      12-05-2009, 12:14 PM   #11
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i got this code wen my fuel pump was failing. But i got other codes with it aswell.

I have a number of people of getting this code on stock cars aswell.

IMHO nothing to worry about really.
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      10-15-2010, 06:43 AM   #12
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If it is the only code you get, no worries, if you get it with a 29DC or 2FBF then your fuel pump is failing - I got a limp and a 29DC with it and needed a fuel pump.

http://www.bmwtis.com/tsb/bulletins/...p/B130509g.htm
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      10-17-2010, 08:04 AM   #13
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I got this code after (1) switching from 93 BP fuel to Phillips66 93, (2) long (6-7) AM crank, (3) brief engine stutter under moderate load, followed by a yellow half/engine light & limp.

I assumed bad HPFP. I was just about to go on trip to Kansas, so called dealer hoping they could replace HPFP on Sat AM. I drove car home, disconnected battery to clear limp, and drove it to dealer with car running OK. Dealer replaced HPFP after testing it -- EKP function check showed 5.2 bar after 10 min. Replaced HDP, cleared adaptations & codes, but after test drive 2AAF still present. Resubmitted TC case.

???
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      06-15-2011, 01:58 PM   #14
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My car is stock
Sometimes this code appears alone.

My fuel pump is new (march 2011)
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      06-15-2011, 02:41 PM   #15
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I had this code stored, car never threw a CEL, just saw it in the log after I installed my JB4. Cleared it, will see if it comes back in a few days. I didn't have any other codes stored.
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      06-16-2011, 01:37 AM   #16
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Nothing to worry abt ... I have had it a couple times - just delete.
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      06-16-2011, 06:31 AM   #17
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I have that code all the time, after clearing it it always comes back...
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      06-16-2011, 07:23 AM   #18
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Quote:
Originally Posted by roadkillrob View Post
If it is the only code you get, no worries, if you get it with a 29DC or 2FBF then your fuel pump is failing - I got a limp and a 29DC with it and needed a fuel pump.

http://www.bmwtis.com/tsb/bulletins/...p/B130509g.htm
I got this code with 29DC and the car went to a limp mode also. The fuel pump was replaced by the dealer.
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      06-16-2011, 08:02 AM   #19
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You guys realize that Franzz just revived a 2y old dead thread to give the OP an answer? WTF?!?

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      06-16-2011, 08:04 AM   #20
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      12-10-2012, 10:02 PM   #21
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what do you mean disconnected jb3 ith chip change? which chip?

how can I clear this code?


Quote:
Originally Posted by enrita View Post
nope that code is the fuel pump plausability . comes up when there is a signal interruption. i always got it when i disconnected the jb3 during chip change.
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