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2020 Ford Transit-350 XLT 3.5L Hesitation, MIL Lamp on, boost code p0299
Posted to Ford Driveability on 11/9/2025 9 Replies

Runs great at Idle. While driving will initially get good boost reading from gauge. Then drops and send a P0299 under boost code. Checked all the obvious related issues with leaks, hoses, wastegate, blow off valve, etc. Leaning towards a bad replacement tu...

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car Vehicle Data

2020 Ford Transit-350 XLT

VIN 1FTBW2CG2L
Engine3.5 L / 6 cyl / GAS
Trans1-speed Automatic (Electronic)
DeliveryFuel Injection / oem
EmissionsOBD-II Compliant
SymptomsHesitation, MIL Lamp on, Boost Code P0299
OccursWhile Driving

Trouble Codes

P0299Turbocharger Underboost Problem
Open Help Request

car Vehicle Data

2020 Ford Transit-350 XLT

VIN 1FTBW2CG2L
Engine3.5 L / 6 cyl / GAS
Trans1-speed Automatic (Electronic)
DeliveryFuel Injection / oem
EmissionsOBD-II Compliant
SymptomsHesitation, MIL Lamp on, Boost Code P0299
OccursWhile Driving

Trouble Codes

P0299Turbocharger Underboost Problem