Anyone else have their main control valve replaced? I didn't see much mention of it in the forum.Took my 2021 (with 11K miles) to the dealer due to harsh downshifting. Seems like it is a known issue. I'm not a tech, but their notes said they replaced the control valve body assembly and performed an adaptive learning drive cycle. Seemed to be OK for a bit after I picked it up, but is now right back to where it was before. Certainly going to take it back in, just wanted to see if this is something anyone else has encountered.
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Transmission Woes- Control Valve
- Thread starter jaymest
- Start date
There are a bunch of TSB’s on these transmissions. They start with a drive cycle, then a re-flash, and either a new valve body or maybe front support. Just went through this at 55,000 miles (the first issue with my ‘20). Ended up with a brand new transmission after all kinds of metal shavings were discovered once the valve body was pulled.
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