The electrical conductor plate on the 722.6 tranny has a float valve that sends a code if the fluid gets too low. Does anyone know how low the fluid would have to get for that to happen?

BTW Kent Bergsma's recent videos on the 722.6 are pretty helpful and interesting.

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I haven't seen that this float is a low level sensor, it is more of a fluid level control device. Have a look at a trans electrical schematic , code list to be sure.