What are the main causes for a 2001 Jetta to not shift into 3 and 4. only seem to change from 1 to 2 if done manually , Oil , pan and filter has been removed , oil is dirty.Thank you.
Hello, I'm Jason. I will do my best to answer your question quickly and accurately using the information you have provided.
ok, so I'm curious if you've had the transmission control module scanned for fault codes
I'll go through a few common issues
First off, I don't necessarily think a fluid and filter change will help in this case.
But with the pan off currently, I suggest taking a very close look at the conductor strip that's connected to the series of solenoids
I've seen this strip develop breaks in the area where it comes out of the front of the transmission
but if you can get a scan done and report the fault codes to me, I can likely help further
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