I have a BMW 323i and when I drive about 20
minutes I see the yellow gear sign and it stops
moving it runs and goes into gear but doesn't move
and the engine gets hot what's the issue
the yellow gear light means there is a transmission fault code stored in the system. The overheating issue might be a serperate issue or related. Scan for codes and determine why the car is overheating. Are you leaking antifreeze? maybe the trans is getting too hot? The trans might be going into limp mode or there is something more serious going on.
It goes into limp mode I don't see a leak
And when I open the hood it's really hot I'm pretty sure it's the trans
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