there are many possibilities to cause this symptom

For a new car at the very low temperature condition, PCM might shift tranny onto limp-in mode, that will cause this symptom. For an old car, inner temp. sensor, low fluid level, wrong fluid filled, internal tranny failure, are all might be the causes. If you choose tranny at Winter Mode, it seems normal if the temp. is extremely low. If you put more detail here you might get accurate info for your symptom. 這是一手經驗.