Cam Phaser Wear / VCT Solenoid Failure
high- Typically appears
- 80k–140k mi
- Estimated repair
- $1,200 – $3,500
Popular pick
2021 Ford
F-150
3.3L V6
The 2021 Ford F-150 (14th generation) is America's best-selling vehicle and a full redesign year, bringing a new aluminum-intensive body, a wider range of powertrains, and a completely overhauled interior with the available Max Recline seats and massive center console. The 3.5L EcoBoost V6 is the volume engine of the lineup, blending strong towing capability with reasonable fuel economy for a full-size truck. This generation introduced the optional onboard Pro Power Onboard generator (up to 7.2 kW), a 12-inch SYNC 4 screen on upper trims, and a hybrid (PowerBoost) option. The aluminum body continues from the 13th gen but is further refined, and the frame is fully boxed high-strength steel. For most buyers the 3.5L EcoBoost hits the sweet spot between performance and versatility. As a 2021, this truck is young enough that major mechanical surprises are unlikely if maintained well, but the EcoBoost engines do have a track record of specific issues — especially around the phased cam system and high-pressure fuel delivery — that owners should know going in.
Reliability
3/5
Specs shown for F150 Pickup 2WD — the most common configuration.
Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.
Engine
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Drivetrain
RWD
Fuel
Gasoline
MPG
19 city / 25 highway
Seats
—
Doors
—
Body
Standard Pickup Trucks 2WD
MSRP
$28,940
Overview
AI-curatedThe 2021 Ford F-150 (14th generation) is America's best-selling vehicle and a full redesign year, bringing a new aluminum-intensive body, a wider range of powertrains, and a completely overhauled interior with the available Max Recline seats and massive center console. The 3.5L EcoBoost V6 is the volume engine of the lineup, blending strong towing capability with reasonable fuel economy for a full-size truck. This generation introduced the optional onboard Pro Power Onboard generator (up to 7.2 kW), a 12-inch SYNC 4 screen on upper trims, and a hybrid (PowerBoost) option. The aluminum body continues from the 13th gen but is further refined, and the frame is fully boxed high-strength steel. For most buyers the 3.5L EcoBoost hits the sweet spot between performance and versatility. As a 2021, this truck is young enough that major mechanical surprises are unlikely if maintained well, but the EcoBoost engines do have a track record of specific issues — especially around the phased cam system and high-pressure fuel delivery — that owners should know going in.
Known for
- Best-selling vehicle in the US for decades running
- 3.5L EcoBoost V6 strong towing and real-world performance
- Aluminum alloy body — lighter but dent-prone vs. steel
- Extensive technology and comfort options for the segment
- High resale value across nearly all trim levels
Best for
- Towing and hauling regularly (properly equipped)
- Daily drivers who also need truck capability on weekends
- Contractors and tradespeople needing Pro Power Onboard
- Families wanting full-size comfort with work capability
- Wisconsin winters when equipped with 4WD (not this RWD config)
Watch for
- RWD only on this configuration — poor in Wisconsin snow without added weight or winter tires
- EcoBoost cam phaser and VCT solenoid issues at higher mileage
- Aluminum body panels are expensive to repair after collisions or hail
- Spark plug blow-out risk if plugs are not changed at proper intervals
- Tailgate and door latch issues reported on early 14th-gen production
Common issues by mileage
6 knownSpark Plug Blow-Out (3.5L EcoBoost)
medium- Typically appears
- 60k–100k mi
- Estimated repair
- $300 – $900
High-Pressure Fuel Pump (HPFP) Failure
medium- Typically appears
- 70k–120k mi
- Estimated repair
- $600 – $1,400
10-Speed Transmission Harsh Shift / Shudder
medium- Typically appears
- 30k–80k mi
- Estimated repair
- $200 – $800
Door Latch / Tailgate Latch Failure (TSB-covered)
medium- Typically appears
- 0–40k mi
- Estimated repair
- $0 – $400
O2 / Heated Oxygen Sensor Failure
low- Typically appears
- 90k–150k mi
- Estimated repair
- $200 – $550
Maintenance schedule
- 1 Every 7,500 miles or 12 months, whichever comes first Full synthetic oil change (5W-30 Ford-spec)
The EcoBoost's direct injection and VCT system create significant oil demand. Extended intervals invite cam phaser wear — the single most expensive EcoBoost failure. Don't stretch to 10k+ miles.
- 2 Every 60,000 miles under normal use; every 40,000 if towing regularly Transmission fluid change (Mercon ULV)
Ford lists this as 'lifetime' fluid but the 10-speed runs hot under tow loads. Fresh fluid eliminates most shift-quality complaints and protects clutch packs.
- 3 Every 60,000 miles Spark plug replacement (OEM-spec iridium)
Worn plugs in a turbocharged engine increase misfire risk and can cause plug blow-out in the aluminum head. Use OEM or OEM-equivalent plugs only — wrong heat range causes problems.
- 4 Every 30,000 miles or annually Engine air filter inspection and replacement
Wisconsin road dust and fall debris load up filters faster than milder climates. A clogged filter reduces turbo efficiency and fuel economy noticeably on this engine.
- 5 Every 60,000 miles / 5 years Coolant flush (Motorcraft Orange or Gold spec)
EcoBoost engines run hot; degraded coolant accelerates head gasket wear and water pump erosion. Match the Ford-spec coolant — mixing types causes gel formation.
- 6 Every 2 years regardless of mileage Brake fluid flush
Brake fluid absorbs moisture. In Wisconsin freeze-thaw cycles this accelerates corrosion inside calipers and ABS modulators.
- 7 Monthly through winter (November–March) Undercarriage wash and inspection
Lake Geneva roads get heavy salt application. The F-150's steel frame and suspension components are not immune to accelerated rust — a thorough wash-out after every significant snow event extends their life significantly.
- 8 Every 60,000 miles; after first 1,000 miles if towing from new Differential fluid change (rear axle)
RWD puts all driveline load on the rear diff. Neglected fluid leads to premature gear and bearing wear. Critical if the truck is used for towing.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$600 – $1,200
Fuel
At 20 MPG combined and ~15,000 miles/year, expect roughly $2,100–$2,600/year at $2.80–$3.50/gallon. Towing will push real-world economy well below 20 MPG.
Insurance
Typically $1,400–$2,000/year in Wisconsin for full coverage on a 2021 F-150 depending on driver profile, trim, and coverage level.
The F-150 is a moderately expensive truck to maintain but holds its value exceptionally well, which offsets total ownership cost over time. Routine maintenance on the 3.5L EcoBoost runs $600–$1,200/year at an independent shop under normal use. Budget extra if you tow regularly — transmission, differential, and brake service intervals tighten considerably. The aluminum body dramatically reduces rust concerns versus older F-150s, but collision repair costs are higher. Parts availability is excellent and aftermarket competition keeps prices reasonable.
Seasonal care
Lake Geneva, WI Winter
- This truck is RWD — add 400–600 lbs of ballast (sandbags or a weight plate) over the rear axle before the first snow to prevent fishtailing on Wisconsin roads.
- Switch to a dedicated winter tire set; all-season tires lose grip below 45°F on ice and packed snow, especially on RWD.
- Test the battery before November — the EcoBoost's twin turbos and high compression demand strong cranking amperage at sub-zero temps. Replace any battery showing more than 3 years of age.
- Use a winter-grade washer fluid rated to at least -20°F; Lake Geneva winters regularly hit single digits and the injectors will freeze with summer fluid.
- Check and replace wipers with winter-rated blades; the tall hood line and wide windshield of the F-150 make visibility critical — worn blades smear rather than clear.
- After driving on salted roads, flush the undercarriage — especially the frame rails, control arm pockets, and brake lines — at a self-serve bay as often as weekly during heavy salt periods.
Summer
- Check tire pressure every 2–3 weeks; Wisconsin summer heat causes pressure to rise 1–2 PSI per 10°F increase, which affects handling and wear on these wide truck tires.
- Inspect the A/C system before July — the EcoBoost generates significant underhood heat and a marginal A/C system will struggle on 90°F days with the cab sitting in the sun.
- Check engine coolant level and condition before towing season; heat soak from towing combined with summer temps stresses the cooling system.
- Inspect the bed liner and tailgate seals; UV and heat crack rubber seals and degrade liner coatings, allowing water to pool and accelerate bed corrosion at fastener points.
Comparable vehicles
2021 Ram
1500
Closest cross-shop; Ram's 5.7L Hemi or eTorque V6 compete directly with the EcoBoost. Ram leads in ride comfort; F-150 leads in towing capability and resale.
2021 Chevrolet
Silverado 1500
Direct competitor with a simpler naturally-aspirated V8 option. More traditional ownership experience; slightly lower resale than F-150 but well-supported parts network.
2021 Toyota
Tundra
For buyers prioritizing long-term reliability over maximum features. The 2021 Tundra (old gen) is simpler mechanically and has a strong 200k+ mile track record, though it trails on tech and towing.
2021 GMC
Sierra 1500
Silverado platform sibling with more premium interior options. Competes at similar price points; MultiPro tailgate is a differentiator if cargo flexibility matters.
If you're shopping for one
Red flags
- Check engine light currently on or recently cleared — on this engine it almost always points to a VCT/cam phaser issue
- Oil consumption beyond 1 qt per 3,000 miles — can indicate worn piston rings accelerated by infrequent oil changes
- Any evidence of overheating (white deposits on oil cap, milky oil) — head gaskets on the EcoBoost are not cheap
- RWD with no winter tire set and a Wisconsin seller — means it was driven in snow without appropriate tires, check for suspension and body damage
- Recent transmission service at under 40k miles on a non-towing truck — may indicate prior shifting complaints being masked
What to inspect
- Pull codes before purchase — cam phaser and VCT solenoid codes (P0012, P0015, P0022, P0025) on a used example are expensive red flags
- Verify all open TSBs and recalls have been completed — especially door latch and tailgate latch issues on early 2021 builds
- Check transmission for harsh shifts or hunting between gears at 40–55 mph; may indicate fluid degradation or software needing update
- Inspect all four aluminum body panels for dents and repairs — aluminum repairs are costly and aftermarket fenders/doors are expensive
- Check the frame and running boards for rust perforation — the frame is steel and does rust in Wisconsin; body may look clean while frame is compromised
- Test the turbo for lag, smoke on startup, or boost pressure hesitation — signs of worn turbo bearings or intercooler leaks