2AAF code??

Jr335idaily · 10-09-2018, 02:20 PM

So the mechanic said that was the code and I figured it was my hpfp but he is saying it's the low pressure?
My car does go into limp mode and has engine malfunction and transmission malfunction with my brake light on and other lights. yesterday I was driving and my car shut off complete in drive I had to switch it to park and turn it back on it turned on fine.
He said I had a crankshaft sensor code but it would come and go. Is it my hpfp or a low pressure sensor or is it my crankshaft or all three?

kenni243 · 10-10-2018, 02:18 AM

2AAF is Fuel Pump Plausibility?... This is the fuel pump(lpfp). Is this the only code the mechanic saw? I saw your other posts of same topic so have you got a full scan of all the codes?

Jr335idaily · 10-10-2018, 02:03 PM

That was the only code other than my crankshaft sensor but he said that code was coming and going but I'm going to replace my crankshaft sensor and also lpfp hopefully that solves the limp mode and all the lights popping up.

N54rsenal · 10-10-2018, 11:20 PM

Im getting the 2AAF Fuel Pump Plausibility code also but no CEL.

If it goes into limp mode when I'm doing a pull I will take a look at the file auto logged on my last pull and see if my low pressure fuel pump dipped below 50psi.

If so its got to be related and time for a full E85 capable LPFP.

10-09-2018, 02:20 PM	#1
Jr335idaily Enlisted Member 9 Rep 45 Posts Drives: 2009 335i sedan Join Date: Sep 2018 Location: Fresno iTrader: (0)	2AAF code?? So the mechanic said that was the code and I figured it was my hpfp but he is saying it's the low pressure? My car does go into limp mode and has engine malfunction and transmission malfunction with my brake light on and other lights. yesterday I was driving and my car shut off complete in drive I had to switch it to park and turn it back on it turned on fine. He said I had a crankshaft sensor code but it would come and go. Is it my hpfp or a low pressure sensor or is it my crankshaft or all three? __________________ E90
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10-10-2018, 02:18 AM	#2
kenni243 Second Lieutenant 8 Rep 286 Posts Drives: 335I Sedan - Black/Black Join Date: Mar 2007 Location: Worcester iTrader: (0)	2AAF is Fuel Pump Plausibility?... This is the fuel pump(lpfp). Is this the only code the mechanic saw? I saw your other posts of same topic so have you got a full scan of all the codes?
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10-10-2018, 02:03 PM	#3
Jr335idaily Enlisted Member 9 Rep 45 Posts Drives: 2009 335i sedan Join Date: Sep 2018 Location: Fresno iTrader: (0)	That was the only code other than my crankshaft sensor but he said that code was coming and going but I'm going to replace my crankshaft sensor and also lpfp hopefully that solves the limp mode and all the lights popping up. __________________ E90
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10-10-2018, 11:20 PM	#4
N54rsenal Enlisted Member 6 Rep 36 Posts Drives: 2010 335i M Sport LCI Join Date: Oct 2018 Location: Chicago iTrader: (0)	Im getting the 2AAF Fuel Pump Plausibility code also but no CEL. If it goes into limp mode when I'm doing a pull I will take a look at the file auto logged on my last pull and see if my low pressure fuel pump dipped below 50psi. If so its got to be related and time for a full E85 capable LPFP. Last edited by N54rsenal; 10-10-2018 at 11:27 PM..
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