first, does the car have a charge and start??? Does the Yellow triangle show when the car is on, and in use??
Does the car start and work ok, and only show the yellow triangle when you plug it into your L1 or L2 charger?
First, I would turn off any charging timers or controls you may have used...
If the yellow light is only when you plug in the charger, I would check that the charger is working... Use the included 120 volt charger first. It should have a ground, and when you plug the car is, it should do its characteristic beeps. The lights on the 120 volt charger should not be showing a "fault". That is when there is not ground..... If it works or doesn't work, then try it with a L2 charger if you have one also
I've gotten the Yellow triangle after I charged and disconnected the cable. I drive for a while, turn off the car, restart it, and the Yellow triangle is gone...
please explain more details about what happens when you do things... not just light colors...