My 2015 started throwing P2020 and P200A codes frequently. Dealer says intake manifold needs to be replaced. Its in the shop now being replaced under AEM Warranty. They say the intake manifold is extremely gunked up with carbon. I have 160,000 on truck and had AEM applied in May 2019. Now I have the EGR recall. I also received a letter from FCA saying there is an update to the AEM coming. Had some coolant drips in garage in the middle under the motor. They said the water pump is leakings slightly. But I read about the EGR leaks and that maybe the engines are burning coolant. Very confusing. I guess we'll replace intake manifold, I'll get the EGR recall done in April, and the AEM update when available. I have asked the dealer what is normal for carbon build up in intake. They say it depends on how your drive and whether you sit idling a lot. I'm pretty sure that with all the factors/recalls/updates in play here that they are nearly as confused as I am. If you hear anything about how they measure normal carbon build up please post. I really love this truck despite this recent grief. I'd like to keep it another 160,000 miles.