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My understanding is that the TCU and the ECU (as well as various other control units in the car) have to all be coded into the car.
The ECU and the TCU operate in a continuous feedback loop. It may be that the new engine and the transmission don't recognise each other.
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Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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