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My BMW 5 Series 2000 model is stuck in 3rd gear.This happened after the reversing lights stopped working. Is there a relay to the transmission via the reversing lights?I've recently changed the alternator because the battery light was stuck on.It fixed the battery light but now the transmission changing is not working. Any advice would be much appreciated.
 

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Pull the codes. It's pointless to start guessing without any real information. You will need a scanner that can pull transmission codes.
 

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+1 you need the tranny codes to properly diagnose this problem. A failing alternator has been known to trigger the TRANS PROG FAILSAFE message. While you have changed the alternator, this might be related.
 
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