Fault code 2F71

wss4 · 10-19-2015, 03:15 PM

I went to update my ECU for alpha-N programming this weekend and discovered the 2F71 "E-box fan, input signal" code recorded prior to flashing. This appears to be for the blower unit that cools the sealed ECU box in the engine bay. The code comes back almost immediately after clearing.

I removed the blower unit from the driver footwell to test outside of the car, and it seems to work fine hooked up to 9V battery power (all I had in a pinch) - fine in the sense that it is not obviously seized or burnt out. I'm wondering if anyone knows the fuse location for this fan. A little bit of research indicated that fuse #33 was the fuse, but the fuse was not blown upon inspection.

Anyone have any experience with this problem? I found it interesting that there was no notification beyond a soft code for a theoretically very important cooling component. Maybe our ECU's are capable of running within temperature parameters without the fan?

3002 tii · 08-09-2019, 11:42 PM

bump having same code, fan seems really easy to replace but could I be missing anything else (before I spend $100 on replacement part)?

wss4 · 08-19-2019, 10:46 PM

Mine was a dead fan. I tried a couple other things first (but honestly can't remember what they were anymore)

3002 tii · 08-20-2019, 08:55 PM

Quote:

Originally Posted by wss4

Mine was a dead fan. I tried a couple other things first (but honestly can't remember what they were anymore)

Thanks, I ended up just replacing mine tonight. Will monitor codes next few days.

wdb · 08-24-2019, 05:21 PM

Subbed. Just in case!

10-19-2015, 03:15 PM	#1
wss4 Private First Class 35 Rep 159 Posts Drives: 2008 Z4 M Coupe Join Date: Mar 2011 Location: San Diego iTrader: (3)	Fault code 2F71 - Ebox fan I went to update my ECU for alpha-N programming this weekend and discovered the 2F71 "E-box fan, input signal" code recorded prior to flashing. This appears to be for the blower unit that cools the sealed ECU box in the engine bay. The code comes back almost immediately after clearing. I removed the blower unit from the driver footwell to test outside of the car, and it seems to work fine hooked up to 9V battery power (all I had in a pinch) - fine in the sense that it is not obviously seized or burnt out. I'm wondering if anyone knows the fuse location for this fan. A little bit of research indicated that fuse #33 was the fuse, but the fuse was not blown upon inspection. Anyone have any experience with this problem? I found it interesting that there was no notification beyond a soft code for a theoretically very important cooling component. Maybe our ECU's are capable of running within temperature parameters without the fan?
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08-09-2019, 11:42 PM	#2
3002 tii Lieutenant General 2279 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.20]	bump having same code, fan seems really easy to replace but could I be missing anything else (before I spend $100 on replacement part)? __________________ Follow for latest mods
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08-24-2019, 05:21 PM	#5
wdb dances with roads 4696 Rep 4,093 Posts Drives: '07 E86, '02 996, '95 Seven Join Date: Jul 2015 Location: the perimeter iTrader: (4)	Subbed. Just in case!
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08-19-2019, 10:46 PM	#3
wss4 Private First Class 35 Rep 159 Posts Drives: 2008 Z4 M Coupe Join Date: Mar 2011 Location: San Diego iTrader: (3)	Mine was a dead fan. I tried a couple other things first (but honestly can't remember what they were anymore)
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