P0299 - Turbocharger/Supercharger A UNDERBOOST Condition

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2021 Lincoln Navigator, 2021 Lincoln Nautilus, 2021 Lincoln Corsair, 2021 Lincoln Aviator, and 2021 Ford Transit-350 HD. However, it is still accessible from the selected car via links, so may be relevant.

DTC DESCRIPTION P0299 - TURBOCHARGER/SUPERCHARGER A UNDERBOOST CONDITION

Description:	This DTC sets when the actual TCBP value is less than the desired TCBP value by 27.6 kPa (4 psi) or more for 5 seconds, indicating an under boost condition.
Possible Causes:	Damaged turbocharger wastegate regulating valve solenoid TC wastegate regulating solenoid valve stuck Wastegate stuck open Wastegate control hose open or restricted Air leak between turbocharger and throttle
Diagnostic Aids:	Check tubing for restrictions, cracks and incorrect fitting connections. Check the turbocharger wastegate regulating valve solenoid for correct operation.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test HN.