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2021 Ford Expedition
Reliability tier: verified - see /disclosure/
Engine: 3.5L V6 EcoBoost (Gen3) (Ford EcoBoost, 3.5L)
3.5L EcoBoost twin-turbo V6, 375 hp / 470 lb-ft standard (400 hp / 480 lb-ft upper-trim premium-fuel tune); 10R80. Fact-check 23.10: MY2021 is still the 375-hp rating - the 380 hp standard tune arrived with the MY2022 refresh (the original note carried 380 onto 2021 by mistake).
Applicable failure modes (6)
- Cam phaser / VCT rattle and cam-timing DTCs
- Cooling service: thermostats, hoses, degas system under tow load
- Internal mechanical failures / long-block decisions
- Low-pressure fuel delivery (in-tank pump / pressure faults)
- Ignition misfires: spark plugs and COP coils
- Turbo / wastegate / boost-control faults
Applicable parts (15)
- 3.5L EcoBoost Charge Air Cooler, Gen2 (FL3Z-6K775-B)
- 3.5L EcoBoost Charge Air Duct (JL3Z-6C646-A, 2018-2020 F-150 / Expedition / Navigator)
- 3.5L EcoBoost Charge-Tube Outlet Tube, Gen2 (Ford HL3Z-6F073-A)
- Cooling system refill with fresh coolant (service item, all 3.5L EcoBoost applications)
- 3.5L EcoBoost Fuel Pump Controller (Ford HL3Z-9D370-B, 2017-2021 F-150 / Expedition / Navigator)
- In-tank fuel filter service (integral to the pump module, all 3.5L EcoBoost applications)
- Cylinder head / block machining and SSM calibration updates (service item, long-block decisions)
- HPFP failure contamination procedure - flush, rails, injector inspection (service item)
- 3.5L EcoBoost High-Pressure Fuel Pump, Gen2 (current number HL3Z-9350-B)
- 3.5L EcoBoost Ignition Coil, Gen2 (current number HL3Z-12029-D)
- Engine oil and filter change (service item, all 3.5L EcoBoost applications)
- 3.5L EcoBoost Turbocharger Assy, Gen2 std (pair JL3Z-6K682-C / -D)
- 3.5L EcoBoost Valve Cover, Gen2 (HL3Z-6582-F)
- 3.5L EcoBoost VCT Solenoid (Ford HL3Z-6M280-A, 2017+ applications)
- 3.5L EcoBoost Water Pump, Gen2 (JL3Z-8501-B)
Platform recipes (5)
- CAC-condensation shudder fix: the Gen1 pattern (humid-day single shudder after light-throttle cruising) traces to pooled condensate in the charge-air cooler
- Ignition service for the boost-stressed 3.5L EcoBoost: misfire DTCs first, then plugs and the failed coil(s)
- Cam-phaser rattle / timing-chain service: the cold-start rattle and cam-timing DTCs (P0011/P0015-P0019/P0365/P0369) span generations - Gen2 got formal TSBs (20-2191/20-2166/20-2315) and the 21N08/21B10-S1 PCM-reprogram field actions; Gen1 carries the chain-wear story (TSB 17-0026)
- Turbo / boost-control service: boost DTCs (P0236/P0238/P0299 family) first, hardware second
- Internal water-pump service: the 3.5L EcoBoost carries the pump inside the front cover - a failed seal can send coolant into the oil pan (bearing damage) or leak externally