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
13,573 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.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

+3

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

Was this

answer

helpful?

Yes

No

+1

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

STEVE W.

MECHANIC
13,573 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.

Was this

answer

helpful?

Yes

No

+3

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

Was this

answer

helpful?

Yes

No

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

STEVE W.