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2012 E550 coupe
4 Posts
Discussion Starter · #1 ·
Hello All,

I'm a new owner of an E550 coupe and I love it. I have a check engine light however that show UO 402 Invalid Data Received from Transmission Control Module.

Any ideas besides the possibility that I need to replace the module? The tranny doesn't show any oil leaking at all.

I'm new to this forum and figured there are a lot more people who have the e550 4 door version. also, can someone point me to the TOP performance mods to the 4.6 twin turbo?

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