What is diagnostic trouble code 277B?

[BimmerMan33]

I have a 2011 e92 M3, 65K miles, car went into limp mode while moderate rev match downshifting, maybe around 5K rpm, also heard a fart like sound for a fraction of a second while rev matching.
Scanned for codes: 2B25, 277B. First one I believe has to do with throttle actuator bank 1, but 277B says "fuel cap..." not sure about this one.
Turned the car off & restarted, no limp mode, until I drive it spiritedly & limp mode recurs. Set of throttle actuators ordered from Mpowermotorsports.org

Guys, any ideas/experiences with 277B?
Thanks!

[jcolley]

Originally Posted by BimmerMan33

I have a 2011 e92 M3, 65K miles, car went into limp mode while moderate rev match downshifting, maybe around 5K rpm, also heard a fart like sound for a fraction of a second while rev matching.
Scanned for codes: 2B25, 277B. First one I believe has to do with throttle actuator bank 1, but 277B says "fuel cap..." not sure about this one.
Turned the car off & restarted, no limp mode, until I drive it spiritedly & limp mode recurs. Set of throttle actuators ordered from Mpowermotorsports.org

Guys, any ideas/experiences with 277B?
Thanks!

What are you reading the codes with? 277B doesn't show up in some of the diagnostic references and without the extended data ISTA can probe, it's hard to say. These are the possible cross references in ISTA:

[BimmerMan33]

Already purchased rebuilt throttle bodies from Abdul@mpowermotorsports, replaced last night.
Will clear codes and see what happens. Maybe 277B is present because of 2B25 which is related to throttle actuators.

Thanks guys!