If everything mechanically performs normally I would think the temperature sensor and/or its wiring is the issue. Vehicles are rolling computers these days and as such more often the electronics are the root cause.
There are a lot of voltage sensitive sensors in a modern car. A weak battery can cause the sensors to give erratic information to the computers and create false readings. Same with bad connections (check your grounding wires).
Can you give a little more of an explanation? What’s the ambient temp out? Are you driving in Sport or Sport+ and getting on the car and it still isn’t coming up to temp?
If you drive in C mode and drive non aggressively, the trans takes a long time to warm up to 120*(temp where blue goes to white). I took off on a highway cruise in like 30 degree weather recently and threw on distronic at about 75mph and the trans was at 118* and still blue after probably 20-30 miles. Getting on it though and driving with some spirit temps get where they should.
I live in Dallas so ambient temp varies 30-40F in any given 24hr period. I usually drive on the toll roads in C mode and never in my almost 4 years of ownership has it ever taken so long to come out of the blue (which it will do eventually.)
Everything is functioning properly otherwise-this is just a new "issue" for my ride.
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