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In messing around back there, they probably dislodged/disconnected the load resistor for that turn signal. Since it's LED, it doesn't draw the current he BCM is expecting. So a resistor is needed to keep the car happy.

I wouldn't rule out the possibility that the first dealer did a real hack job and left a royal mess. I'm guessing the first set wasn't real plug-n-play.
 

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I'm not sure where the resistor is. It might be internal to the tail lights. All I know is if you have LED turn signals, you'll need one somewhere. If it's not in the tail light, it's in the wiring somewhere. It may not be by the tail light, but somewhere in the trunk where there was more room to be adding things.

The message is supposed to warn you about a burnt out bulb. Once you replace the bulb, it goes away. It's not supposed to be a big production to reset it. But since LED lights draw so little current, it fools that sensor. So that's why the resistor is needed.
 
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