p0562 code on jeep kJ

so week or so ago I through a p0562 code which mean low voltage in the system, so I checked every thing. So I tested the battery as it sat there with no draw a solid 14.2 turned on the motor every thing I have electric in the jeep lights, high beam radio, ac, and 800w power inverter , window wipers , and the voltage reader says 16.4 so I think this means it is not the battery or the alternator.

Question is though why am i still getting a p0562 code and the check engine light is still on? any ideas?
 

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