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2007 Supra 22SSV. Check trans warning comes up on computer screen when going more than ~18MPH. Warning goes away when slowing back down to ~5MPH.

Transmission and VDrive fluid levels fine. ...

My depth finder reads fine without the engine running. Soon as I start the engine, it sticks at the same value. Speedometer and perfect pass work fine.

I'm guessing some sort of interference,...