Ford · Known Issues
2021 Ford F-150 Problems: 20 Known Issues
2021 model year · 5,820+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2021 model year · 5,820+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 5,820+ owner reports, the 2021 Ford F-150 has 20 documented known issues, with 6 rated critical. The most serious are 3.5L EcoBoost Turbocharger Wastegate Failure — Stuck Wastegate / Reduced Engine Power ($1,800-$5,000 repair), 10R80 10-speed transmission harsh/erratic shifting and torque-converter shudder ($150-$4,500 repair), 2.7L EcoBoost Coolant Intrusion from Cracked Cylinder Head ($4,000-$8,000 repair), 3.5L PowerBoost Hybrid Exhaust Heat Exchanger Coolant Leak ($500-$1,500 repair), Integrated Trailer Module Loses Communication — Loss of Trailer Brakes, Turn Signals, and Brake Lights While Towing (NHTSA 26V104) ($0-$0 repair) and Rearview Camera Image Freezes, Blacks Out, or Delays When Reversing (SYNC 4 Recall 25S49 / NHTSA 25V315) ($0-$0 repair). The most commonly reported issue is 10-Speed Transmission Shudder/Harsh Shifts with 2,800 owner reports. Across all issues with published estimates, repair costs range from $40 to $8,000. DIY maintenance guides at au7o.io.
ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
Ford Motor Company (Ford) is recalling certain 2021-2026 F-150, 2022-2026 F-250 SD, F-350 SD, F-450 SD, F-550 SD, Maverick, 2024-2026 Ranger, 2023-2026 F-600 SD, 2022-2027 Lincoln Navigator, Expedition, and 2026 E-Transit vehicles. When towing a trailer, the integrated trailer module (ITRM) may lose communication with the vehicle, possibly causing a loss of brake and turn signal lights, or a loss of brake function. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, " Lamps, Reflective Devices, and Associated Equipment."
STRUCTURE:BODY
Ford Motor Company (Ford) is recalling certain 2026 Maverick, F-150, and Bronco Sport vehicles. Certain vehicle joints may be improperly tightened. This can lead to detached parts, unsecured cargo, degraded crash protection, electrical system failure, or a loss of vehicle stability.
POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT
Ford Motor Company (Ford) is recalling certain 2026 F-150 vehicles. Incorrect rear axle tail bearings may have been installed, which can result in rear wheel lock-up or driveshaft separation.
SUSPENSION:REAR
Ford Motor Company (Ford) is recalling certain 2026 F-150 vehicles.The stabilizer rod fasteners may not have been tightened properly during manufacturing, which can allow the rod to shift out of position.
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:MOUNTING
Ford Motor Company (Ford) is recalling certain 2023-2027 F-150 vehicles. The fuel tank may be improperly secured and leak fuel, or detach from the vehicle while driving.
+ 39 more recalls. Check all on NHTSA.gov
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According to Au7o's analysis of 5,820+ owner reports, the 2021 Ford F-150 has 20 documented issues. The most frequently reported are: 3.5L EcoBoost Turbocharger Wastegate Failure — Stuck Wastegate / Reduced Engine Power, 10R80 10-speed transmission harsh/erratic shifting and torque-converter shudder, 2.7L EcoBoost Coolant Intrusion from Cracked Cylinder Head. Of these, 6 are rated critical and should be addressed promptly.
The 2021 Ford F-150 has 20 known issues documented across 5,820+ owner reports. 6 issues are rated critical: 3.5L EcoBoost Turbocharger Wastegate Failure — Stuck Wastegate / Reduced Engine Power and 10R80 10-speed transmission harsh/erratic shifting and torque-converter shudder and 2.7L EcoBoost Coolant Intrusion from Cracked Cylinder Head and 3.5L PowerBoost Hybrid Exhaust Heat Exchanger Coolant Leak and Integrated Trailer Module Loses Communication — Loss of Trailer Brakes, Turn Signals, and Brake Lights While Towing (NHTSA 26V104) and Rearview Camera Image Freezes, Blacks Out, or Delays When Reversing (SYNC 4 Recall 25S49 / NHTSA 25V315). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Ford F-150 issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 3.5L EcoBoost Turbocharger Wastegate Failure — Stuck Wastegate / Reduced Engine Power, typically costs $1,800-$5,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The wastegate on the 3.5L EcoBoost turbochargers fails, either sticking (carbon/corrosion binding the valve and actuator arm) on early vacuum-operated designs or through electronic actuator/position-sensor faults on 2015-and-newer electric-actuator turbos. A stuck-closed wastegat… Repairs typically run $1,800-$5,000. Severity: high.
The 10R80 10-speed automatic (introduced on the 2017 F-150) is widely reported to shift harshly: jerking, clunking, banging on the 1-2 and 2-3 shifts, hesitation, gear hunting, and occasional limp-mode with a 'Transmission Not in Park' or 'drive mode not available' message. Many… Repairs typically run $150-$4,500. Severity: high.
Ford's 2.7L EcoBoost (and related small-displacement EcoBoost engines) is prone to micro-cracks forming in the cylinder head around the exhaust ports, allowing coolant to seep into the combustion chamber. This produces unexplained coolant loss with no external leak, white sweet-s… Repairs typically run $4,000-$8,000. Severity: high.
On 3.5L PowerBoost full-hybrid F-150s, cracks develop in the coolant spigots on top of the exhaust heat exchanger, causing an external coolant leak. The result is gradual coolant loss, possible engine overheating, and an illuminated MIL/temperature warning — in some cases leaving… Repairs typically run $500-$1,500. Severity: high.
A software fault in the Integrated Trailer Module (ITRM) can cause it to lose communication with the rest of the vehicle while a trailer is connected. This can result in loss of trailer brake and turn-signal lights, or complete loss of trailer brake function, dramatically increas… Repairs typically run $0-$0. Severity: high.
On 14th-gen F-150s running SYNC 4 software versions 1.7 through 1.9, an improper operational sequence in the wireless communication subsystem can cause the center infotainment screen to freeze, go black, and reboot. If this happens while the truck is in reverse, the backup-camera… Repairs typically run $0-$0. Severity: high.
The 10R80 10-speed automatic transmission can develop a shudder during light acceleration, typically between 25-50 mph. This is caused by torque converter clutch issues and affects many F-150s. Ford has released multiple TSBs and fluid updates to address this. Repairs typically run $200-$3,500. Severity: medium.
The water pump on the 3.5L EcoBoost can fail or develop leaks, causing coolant loss and potential overheating. The pump is internal and driven by the timing chain, making replacement labor-intensive. Repairs typically run $800-$2,000. Severity: medium.
Ford's 4x4 F-150s use a vacuum-operated Integrated Wheel End (IWE) system instead of conventional locking hubs: vacuum keeps the front hubs UNLOCKED in 2WD and is released to lock them for 4WD. The system relies on vacuum lines, a hood-area solenoid, and a check valve that are hi… Repairs typically run $100-$700. Severity: medium.
The foam gasket that seals the roof-mounted center high-mount stop lamp (CHMSL / third brake light) against the cab dries out, compresses and shrinks with heat and UV exposure, breaking the watertight seal. Rainwater then runs down inside the cab from the roof opening, soaking th… Repairs typically run $40-$250. Severity: medium.
The plastic pressurized coolant degas (overflow/expansion) bottle and the plastic quick-connect tees/Y-fittings that route coolant between the block, radiator, and bottle develop hairline cracks and seep, especially at seams and hose necks and in cold weather where the square-cut… Repairs typically run $150-$450. Severity: medium.
Ford's two-piece factory lug nuts (a steel core with a thin chromed/stainless decorative cap) trap moisture between the layers. The steel core corrodes and the resulting rust bloom swells the cap outward, so the standard 21mm/22mm socket and the truck's own lug wrench no longer f… Repairs typically run $40-$200. Severity: medium.
P0299 sets when actual boost is about 4 psi or more below the commanded value for several seconds, dropping the truck into reduced-power limp mode (orange wrench light). On EcoBoost F-150s the most common causes are NOT the turbos themselves but cheaper upstream parts: a loose or… Repairs typically run $50-$700. Severity: medium.
The 5.0L Coyote V8 can develop a ticking or rattling noise at startup, often from the cam phasers. This is similar to issues in the Mustang GT. The noise typically diminishes after the engine warms up but can indicate phaser wear. Repairs typically run $0-$2,500. Severity: low.
The HVAC blend door actuators can fail, causing clicking noises from the dashboard and inability to control air temperature. Air may blow only hot or only cold regardless of settings. Multiple actuators are used and any can fail. Repairs typically run $100-$500. Severity: low.
F-150 owners frequently report that the Auto Start-Stop system stops functioning, throwing a 'Start-Stop not available — see owner's manual' message. The system requires the battery state of charge to stay above roughly 70%; the AGM battery setup and the high electrical load of t… Repairs typically run $200-$450. Severity: low.
PowerBoost hybrid F-150s equipped with the 7.2kW Pro Power Onboard generator commonly throw a ground-fault / generator fault that disables the bed and in-cab outlets. Owners and dealers have traced many cases to moisture intrusion — water collecting in the in-bed outlet/connector… Repairs typically run $0-$600. Severity: low.
14th-gen F-150s with the 12-inch SYNC 4 infotainment display commonly suffer a black/blank or frozen screen at startup — sometimes with no Ford logo, sometimes stuck on the splash screen, and sometimes unresponsive for several minutes. Owners report it occurring intermittently (s… Repairs typically run $0-$1,200. Severity: low.
Both the 3.5L and 2.7L EcoBoost turbos use exhaust wastegates whose actuator arm/linkage develops play as the bushings wear. The result is a distinctive metallic rattle — most noticeable for the first ~30-60 seconds after a cold start and at light throttle — coming from the turbo… Repairs typically run $150-$700. Severity: low.
On 2015+ aluminum-body F-150s with the power-locking/keyless tailgate, the electric tailgate lock actuator weakens and fails — it clicks but won't lock/unlock, operates intermittently (especially in cold weather), grinds, or quits entirely so the tailgate won't open from the key… Repairs typically run $60-$250. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.