So my favorite LED bulbs are the AUXITO H11s 360 degree bulb and my 2015 Jeep Grand Cherokee Overland (HID stock lights) had halogen fog lights. Apparently the electrical systems in FCA cars differ in that depending on the year of the car a decoder is required to operate certain LED bulbs. I've found that on FCA vehicles (for my Grand Cherokee at least) at least 9V LEDs work fine without a decoder on my Grand Cherokee fog lights. However, my Auxito H11 had a minimum output of 12v so the Grand Cherokee had trouble reading the LED bulbs properly and this decoder 100% fixed that problem. Simply plug and play between the LED bulb harness and the car power harness, think of this decoder as an intermediary that regulates the power supply so the car's computer reads it correctly so the bulb works properly. 4 stars so far as I just installed it today, if it lasts at least a year then I'll give 5 stars.
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