Fault code 2CFB and 2D09

MB-POWER

MEMBER
2006 BMW 735
3.5L
6 CYL
RWD
AUTOMATIC
134,555 MILES

Rpm's are going up and down all the time, engine power reduced! After scanned we found following codes : (2CFB) and (2D09).
Throttle body has been replaced with used one.
codes cleared also.
but after restart engine again, same codes came back!
Any help please.
Thanks

5 Replies

STEVE W.

MECHANIC
13,003 POSTS

Check the wiring right at the TB, they are known for having loose pin fitment.
Next would be to do a full re-learn and reset of the throttle adaption. There are a few videos out there telling you how to do that using the throttle pedal. Unless you have access to a factory scan tool, those can do all of the resets as well as update the programming.

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Wednesday, August 2nd, 2017 AT 7:10 AM

MB-POWER

MEMBER
80 POSTS

Hi,
One of my friends advice me to replace the DME.
Are you agree with him?
Thanks

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Wednesday, August 2nd, 2017 AT 7:42 AM

STEVE W.

MECHANIC
13,003 POSTS

I would start with the reset procedures. If they do not help then you may need to replace the DME, but then you still have to do the programming with a new one. Many times cleaning the connections and doing the reset will take care of those codes.

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Wednesday, August 2nd, 2017 AT 8:15 AM

MB-POWER

MEMBER
80 POSTS

Okay I will do the reset first, but I would like to ask, is it important of voltage of battery to be more than 12.50V?
The battery voltage now is 9.02V.
Thanks

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Wednesday, August 2nd, 2017 AT 8:24 AM

STEVE W.