In this video I discuss how a failed TCBY valve, also known as a turbocharger bypass valve, caused a code P0299 "turbocharger underboost condition" to set in a 2018 Ford F150 equipped with a 2.7L Ecoboost. The valve got stuck in the open position causing turbocharger boost to be bleed off when the vehicle was not supposed to be doing so. This lead to the SES lamp illuminating and a lack of power upon acceleration.

Note: This situation can affect many of the Ford F150s and Expeditions equipped with an Ecoboost engine, 2.7L or 3.5L. And to my knowledge the 3.5L Ecoboost has been being used on the F150 from 2013 to present day, 2022. Also, the 2.7L Ecoboost has been used in later years on the F150 to present day. The Expedition equipped with the 3.5L Ecoboost can also be affected. I believe that the 3.5L Ecoboost has been in use of the Expedition from around 2015 to present day, 2022. The turbo systems on all of these vehicles are very similar and almost the same. However, there are some differences. So, as always verify everything.


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