I recently had to replace my radiator and subsequently filled the coolant from the top, then took it to the dealer to burp/bleed out the air bubbles. They said they did it, but there might still be air in the system.

I'm getting a P2B837A error, which I believe means that there is still air in the system, so I would like to burp it myself since the dealer didn't complete the job last time. Is there a specific procedure on how to do this? I've seen some generic guides online for how to do it with most cars, but I heard the coolant system on this car is pretty hard to clear air from so I thought I'd check.

 

Not sure about your specific engine, but generally the best way to eliminate air is to first drain the coolant and use vacuum to fully evacuate the system, then refill using the vacuum approach. Check or google coolant vacuum refill kit.