Limp mode

[Digthatmole]

Hi all new to the group thanks for accepting me I have a Mk8 2015 transit custom could anyone help regards a problem I'm having, I've owned the van a few weeks and it's started acting strange van is going in to limp mode when accelerating I've changed maf and map sensor checked actuator seems fine moves freely, I also get the message service now and traction control light, can I ask could it be the egr valve as I've read the codes and it says p0299 underboost. Any help would be greatly appreciated