Sluggish acceleration after rebuilding the transmission

  • 2002 BMW 330CI
  • 6 CYL
  • 2WD
  • 140,000 MILES
I recently rebuilt the automatic transmission. I am just a novice but I believe I did everything correctly. Installed transmission and it was very sluggish at take off. Also the cog transmission light came on the instrument panel. I heard that it went into a safety limp mode and the computer needed to be reset. I purchased an inexpensive scanner tool but when I tried it on the transmission said unable to communicate. It did however seem to communicate to the engine. I called a transmission guy who I know he confirmed it needed to be reset. I brought it to him his computer was also unable to communicate with it. I wiggled wires by computer nothing. Checked fuses, wires that were connected to transmission. Checked transmission fluid level. I am pretty sure it is something connected to me working on the transmission.
Do you
have the same problem?
Sunday, April 15th, 2018 AT 5:08 PM

1 Reply

BMW's can be a bear when it comes to scan tools and communication. Especially when it is not the basic OBD II system you are trying to talk to. Most of the under $1,000.00 tools only do the engine ABS and airbags and some live data. When you need to talk to the transmission or one of the other modules they are usually not an option.
In this case you may need to find a dealer to scan it and see what is going on in the transmission. That would give you a start at the problem.
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Sunday, April 15th, 2018 AT 7:06 PM

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