2021 Ford Transit Problems: 17 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. OMS AutoParts and Autodoc document common Transit turbo problems including loss of power, turbo lag, unusual whistling/whining/grinding noises, and excessive smoke. The commercial use of Transit vans (frequent stop-and-go, high idle hours, heavy loads) accelerates turbo wear beyond what passenger vehicle applications typically experience. FordTransitUSAForum.com documents a case of turbo and manifold failure at 38,000 miles on a 3.5L EcoBoost Transit 350. RepairPal estimates turbocharger assembly replacement between $1,650 and $2,210 depending on the Transit model variant.

On the 2015-2022 Ford Transit 3.5L EcoBoost V6, the 3.5L EcoBoost twin-turbo Transit models experience wastegate actuator sticking, particularly on the passenger-side turbo. Carbon buildup and heat cycling cause the wastegate pivot to seize, resulting in either overboosting (wastegate stuck closed) or underboosting (stuck open). Overboosting triggers an immediate limp mode with reduced power. The issue is more prevalent in Transit vans used for towing or heavy cargo loads that keep the turbos under sustained high heat.

On the 2015-2024 Ford Transit, the Ford Transit aluminum oil pan is prone to drain plug thread stripping, especially in vehicles serviced at quick-lube shops or with frequent oil changes. The aluminum pan threads are softer than the steel drain plug, and over-torquing or cross-threading during routine oil changes permanently damages the threads. Once stripped, the drain plug leaks oil or falls out entirely, potentially causing catastrophic engine damage from oil starvation.

On the 2017-2023 Ford Transit, the 2017-2023 Ford Transit with the 2.0L EcoBlue diesel engine (available in some markets) and the 3.5L EcoBoost V6 experience fuel injector failures causing rough running, misfires, poor idle, reduced performance, and excessive smoke on cold start. Ford issued a service action for 2.0L EcoBlue vehicles built between February and September 2019 after a batch of high-pressure fuel injectors (reported as Continental-supplied) failed to meet quality standards, causing misfire and reduced engine performance. FordTransitUSAForum.com documents injector failure on 3.5L EcoBoost Transit models as well, where direct injection fuel deposits cause injector spray pattern degradation. RepairPal estimates individual injector replacement between $266 and $627 depending on Transit model, but multiple injectors often need replacement simultaneously, and contaminated fuel systems can cost significantly more.

On the 2015-2021 Ford Transit, ford Transit owners, particularly those with the 3.5L EcoBoost and 3.7L V6, have reported stalling or no-start conditions immediately after refueling due to fuel vapor purge system calibration issues within the PCM. The evaporative emission canister purge valve and PCM calibration can cause an overly rich condition when the purge valve opens after a full fill-up, flooding the intake and stalling the engine. Ford issued TSB 21-2299 addressing PCM reprogramming to correct the purge flow logic.

On the 2015-2023 Ford Transit, ford Transit rear leaf springs and their associated U-bolts have been reported to crack, fatigue, or break outright on high-roof and extended-length variants that are operated at or near maximum payload, particularly in commercial fleet service. The high static load combined with road impacts can cause individual spring leaves to crack and the U-bolts clamping the spring to the axle to loosen or fracture. This is noted in multiple NHTSA complaints and fleet maintenance records as a recurring maintenance item on work vans with 150,000+ miles.

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.

On the 2015-2023 Ford Transit, front brake calipers on the Ford Transit, especially the heavy-duty variants (350 and 350HD), are prone to sticking due to corrosion of the caliper slide pins and guide bolts. The high gross vehicle weight combined with stop-and-go commercial use accelerates heat buildup, which bakes the slide pin grease and causes the pins to seize. This results in one pad wearing far faster than the other, warped rotors, and a persistent pulling sensation during braking. NHTSA owner complaints on 2015–2020 Transits mostly describe seized or non-retracting rear calipers, so both axles should be checked.

On the 2020-2024 Ford Transit, later Transits equipped with the 10R80 10-speed automatic have documented owner complaints of harsh 1-2/2-3 shifts, delayed engagement, and occasional shudder. Ford TSB 24-2254 covers 2020-2023 Transits built on or before Aug 15, 2022 with harsh/delayed engagement or shifts, attributing it to axial movement of the CDF clutch cylinder sleeve causing hydraulic circuit leaks. Drivers often describe banging into gear, flare, or hesitation when pulling into traffic.

On the 2018-2023 Ford Transit 2.0L EcoBlue, ecoBlue diesel Transits have documented owner reports of check engine lights and emissions system warnings related to SCR/DEF operation, commonly tied to NOx sensor faults or SCR efficiency monitoring. When the system detects persistent faults, it may trigger reduced power or countdown-to-no-start strategies depending on market/calibration. These issues are frequently accompanied by emissions-related DTCs and can be intermittent before becoming persistent.

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 2015-2023 Ford Transit, multiple Ford Transit owners and fleet operators have reported the instrument cluster exhibiting erratic speedometer behavior, gauge dropouts, and spontaneous warning light illumination without stored fault codes corresponding to the indicated faults. The issue is linked to a faulty instrument cluster circuit board or intermittent loss of communication between the cluster and the vehicle's CAN bus network. Ford recalled certain 2022-2023 Transit models (NHTSA 22V415, and 25V339 for vehicles repaired incorrectly) because the instrument panel cluster may not properly illuminate telltales, gauges, or the speedometer and tachometer pointers, and earlier model years have similar complaints documented in NHTSA's database.

On the 2015-2022 Ford Transit, ford Transit vans experience premature alternator failure, often between 50,000-80,000 miles. The internal voltage regulator fails first, causing undercharging or overcharging conditions. Commercial Transit vans with aftermarket upfitter packages (extra lighting, inverters, refrigeration units) are particularly susceptible due to sustained high electrical loads. Symptoms often start as intermittent battery warnings before progressing to a no-start condition.

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. The issue is accelerated by frequent payload at or near GVWR. The vibration is often misdiagnosed as a tire balance issue.

On the 2015-2022 Ford Transit, transits equipped with rear A/C (dual HVAC) have documented complaints of repeated refrigerant loss and poor cooling, often traced to leaks at rear A/C lines, fittings, or rear expansion valve connections. Corrosion, vibration, and seal degradation can lead to slow leaks that are hard to find without dye or electronic leak detection. Owners typically notice rear cooling performance dropping first, then the entire system stops cooling.