2015 Ford Transit Problems: 13 Known Issues

On the 2015-2024 Ford Transit EcoBoost 3.5, the Ford Transit 350/350 HD with the 3.5L EcoBoost twin-turbocharged V6 experiences turbocharger failures from inadequate lubrication, carbon buildup in the turbo housings, wastegate actuator failure, and turbo bearing wear.

On the 2015-2018 Ford Transit 3.5L EcoBoost V6, the first-generation 3.5L EcoBoost (the 2011-2016 engine generation) used in the 2015-2018 Ford Transit 350/350 HD with the twin-turbocharged V6 is known for premature timing chain stretch. The design uses one long primary chain driving two secondary cam chains, and the long primary chain stretches as the links wear individually, causing the chain to effectively grow longer. A stretched chain causes VCT timing correlation codes, cold-start rattling, rough idle, and eventual jumped timing. Ford moved F-150 and other trucks to a second-generation 3.5L EcoBoost with a dual primary chain system in 2017, but the Transit kept the first-generation engine with revised timing components. Transit vans used for commercial/fleet service with high-idle hours accumulate chain wear faster than typical passenger vehicles.

On the 2015-2019 Ford Transit 3.7L Ti-VCT, owners report sudden loss of power with a wrench light and reduced throttle response, often while cruising or accelerating. NHTSA complaints and Ford service information describe electronic throttle body internal faults (TPS/actuator) that can trigger ETC failsafe and limp mode on 3.7L Ti-VCT Transits. The condition may be intermittent at first and then become frequent, especially with heat/soak and higher mileage.

On the 2015-2022 Ford Transit 3.5L EcoBoost V6, on the twin-turbo 3.5L EcoBoost (GTDI) Transit, a turbocharger wastegate that does not move freely, or a wastegate actuator that leaks, stops the engine from controlling boost pressure. Ford's TSB 15-0115 (July 2015, superseding TSB 15-0107) covers 2015 Transit vans that set code P0234 (overboost), code P0299 (underboost), or both. It also covers 2011-2015 F-150s and the 2015 Expedition and Navigator. The bulletin lists the drivability symptoms as surging and noises described as an air rush, hiss, whoosh, whistle, grinding, growling or scraping. Either turbo can be affected: the bulletin lists replacement parts and labor for the left, the right, or both turbochargers. The bulletin names only 2015 Transit models, so on a 2016 or later van a dealer has to confirm whether the same diagnosis applies.

On the 2015-2020 Ford Transit, ford Transit BCMs, particularly on 2015–2019 models, have been reported to fail or develop software faults causing a wide array of seemingly unrelated electrical issues including random door lock cycling, instrument cluster malfunctions, and accessory power loss. Water intrusion from sunroof drains or cowl leaks can accelerate BCM failure by corroding the module's internal connectors. Ford Special Service Message 47094 notes that 2015-2017 Transits may fail BCM installation programming when a new body control module is installed.

On the 2015-2022 Ford Transit, ford Transit vans experience premature alternator failure, often between 50,000-80,000 miles. Symptoms often start as intermittent battery warnings before progressing to a no-start condition.

On the 2015-2017 Ford Transit, nHTSA complaints and owner reports describe coolant loss from the plastic degas bottle/reservoir cracking or leaking at seams, causing low coolant warnings and overheating if not caught early. Heat cycling and plastic aging can lead to hairline cracks that only leak under pressure. Drivers often notice a sweet smell, visible coolant residue, or repeated low coolant level.

On the 2015-2024 Ford Transit, ford Transit vans are well-known for water infiltration through the roof, particularly in medium-roof and high-roof configurations. Water intrudes through multiple paths: (1) factory roof plug holes (the 2015 roof has 16 plugged holes for optional roof rack and ancillary hardware), (2) roof rack mounting holes where Ford applies only primer circles without top-coat paint, (3) push-pin trim clips along the roof/wall junction, and (4) blocked windshield gutter channels that direct water into the engine bay instead of away from the vehicle. The rust issue is compounded by thin steel roofs and inadequate factory corrosion protection. The FordTransitUSAForum has extensive documentation of roof rust appearing within 3-5 years on vans operating in salt-belt states (Northeast, Midwest). For conversion van owners, water leaks can ruin expensive interior buildouts.

On the 2015-2024 Ford Transit, nHTSA complaints and fleet/owner reports commonly cite the Transit sliding door becoming difficult to open/close, popping, grinding, or failing to latch. Wear in the center roller/hinge and track hardware can cause misalignment, especially on high-use cargo vans. The problem often worsens over time and can lead to the door not fully closing or reopening after latching.

On the 2015-2024 Ford Transit, the Ford Transit rear-wheel-drive models develop axle shaft oil seal leaks at the rear differential, allowing gear oil to weep past the axle seals onto the brake backing plates and brake shoes/pads. The leak is often slow enough to go unnoticed until a rear brake inspection reveals oil-soaked components. In severe cases, contaminated rear brakes cause pulling to one side under braking, which is a significant safety concern for loaded vans.

On the 2015-2023 Ford Transit, long-wheelbase and extended-length Transit models (T-250, T-350, T-350 HD) with two-piece driveshafts develop carrier bearing (center support bearing) failure. The rubber isolator deteriorates and the bearing wears, causing vibrations at highway speeds (50-70 mph) and a prominent clunking noise when shifting between drive and reverse.

On the 2015-2018 Ford Transit, ford Transit models equipped with the 6R80 6-speed automatic transmission are prone to a torque converter clutch (TCC) shudder felt as a vibration or flutter between approximately 40–55 mph during light throttle cruise conditions. The issue is caused by degradation of the transmission fluid's friction modifier additives, which are necessary for smooth TCC lockup engagement on the Ford-spec Mercon LV fluid.

On the 2015-2022 Ford Transit, the Ford Transit uses a MacPherson strut front suspension with lower control arm bushings that are known to wear or crack prematurely, especially in high-mileage commercial fleets or when the vehicle is operated at or near maximum payload regularly. Worn bushings cause the front axle geometry to shift, leading to rapid and uneven tire wear, vague steering, and a pronounced clunking noise over bumps. This is a documented issue in NHTSA complaints and Transit owner forums, particularly on 2015–2020 models used for delivery service.