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  #1  
Old 05-18-2020, 10:58 PM
AnotherPleb AnotherPleb is offline
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Mechatronic Valve Body

Long story short, my 2012 750x valve body is damaged and needs replacement. The TCM and Transmission are still fine. In the pursuit of optimal value, I'm looking at used units before I consider plunking down thousands... Which part numbers need to match on the valve body to be compatible? Will any old 6hp28 do as long as it's the same TCM attached? I'm sure I saw a post or two discussing this, but I am too stupid to find them now.
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Old 05-21-2020, 08:00 PM
HerbP HerbP is offline
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Quote:
Originally Posted by AnotherPleb View Post
Long story short, my 2012 750x valve body is damaged and needs replacement. The TCM and Transmission are still fine. In the pursuit of optimal value, I'm looking at used units before I consider plunking down thousands... Which part numbers need to match on the valve body to be compatible? Will any old 6hp28 do as long as it's the same TCM attached? I'm sure I saw a post or two discussing this, but I am too stupid to find them now.
I would suspect you have some bad seals, that are cheap to purchase. If you can replace them yourself, the fluid is the most expensive item. What kind of problems are you actually having, as the Mechatronic unit rarely fails. Sonnax has the seal kits to rebuild the valve body, or you might actually have a low fluid condition? If you have access to some good diagnostic equipment for a BMW, you could narrow down the problem before wasting money. The Mechatronic unit is considered the TCM, & only the original will work with your car.
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Old 05-21-2020, 08:31 PM
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wjhughes420384 wjhughes420384 is offline
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Mein Auto: 2009 750li, 2018 X5
I had my mechatronics unit replaced. you have to buy a new one, and once mated to the transmission it is locked to it. ever since then I have replaced my tranny fluid every 15 k and twice when I race the car.
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