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Is bmw trying to screw me or what?

733 Views 1 Reply 2 Participants Last post by  mc
I took my car in for service today, because I keep getting a trans fail code on my obc, they told me they did all the test with rpm's and were on the phone with bmw usa, and they told them that if I have an aftermarket sound system that it is sending the wrong signals to my I-bus and if I don't give them a reciept showing them that I had my stereo unhooked (sub and amp) that I would void my transmission warranty. does this sound right?
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