I have a popping noise coming from my exhaust. It went into limp mode last week and I took it to the dealer. They did the pcm update and after driving it around for a few days I started getting a very load popping noise from the exhaust under the passenger side when I left off the gas at lower speeds. It went into manual regeneration a few days later and stopped and then yesterday it returned again. Anyone have any idea what is causing this? Thanks!!!