Many Tail Light Bulbs are dual element. Meaning the bulb itself has 2 light producing filaments on seperate circuits. I don't know for a fact if the Commander's tail lights are dual element, but its possible.
So, one element in the bulb could do turn signals and brake lights, while another does remote start or parking lamp (when the headlamps are on). If only one element burns out, you'd only lose half the functions of the bulb.
There could be corrosion in the bulb socket, etc.
Pull the bulbs out of the malfunctioning tail lamp, look them over to see if you can tell one of the elements are burned out. As well, look over the bulb socket and see if there is corrosion or dirt/liquid that can create shorts.
For what little a replacement tail light bulb costs, I would just get new tail light bulbs and some bulb grease and replace them. If it still doesn't work, double check the sockets for corrosion/dirt/liquid and clean them. If it still doesn't work, then its time to start trouble shooting with a multi-meter, make sure voltage is actually making it to the contacts in the socket.
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