[Hammazs]

Just had a used transmission put into my car. I have a 2011 BMW 550i rwd. The repair shop said they cleared codes, reset adaptations, and reconfigured the transmission. It wont shift out of park. He tested the voltage and says I need a new alternator because its cranking out 15.5 volts witch is high. Because of this, it turns off the modules so they dont fry. Anyone have a similar issue with your car and if so how did you repair it?

[wcr3d]

That is assuming what they are telling you is true.
To me it stands to reason that it was working fine before the swap.

[Oreen0]

Originally Posted by wcr3d

That is assuming what they are telling you is true.
To me it stands to reason that it was working fine before the swap.

+1

[Hammazs]

Turns out it was the alternator, not the transmission. I thought it was the transmission because it wouldn't shift out of third. The alternator was pumping out too much voltage witch put the transmission in limp mode.

[wcr3d]

Glad you got it fixed and thanks for reporting back.

[Boosted M5]

Thanks for the helpful insight! Sorry it cost you an alternator though.