2010 Ford Flex
Common Problems
Ranked from 77 federal NHTSA complaints. Every problem links to the complaint IDs behind it.
12 Common Problems
Ordered by how often owners reported each one to NHTSA. The bar shows how common a problem is relative to the most-reported on this vehicle. Expand any problem to see the federal complaint IDs.
- 1
Intermittent Power Steering Assist Failure
20complaintsSafety riskSteeringThe power steering system intermittently fails, causing the steering wheel to lock up or become extremely hard to turn. A 'Power Steering Assist Fault' message appears on the dashboard.
$200–$1,500est. power-steering / eps repair · 1–6 hrs laborGet local quotes - 2
Engine stalling and sudden power loss due to ECOBoost engine failure
19complaintsHigh severityEngineThe ECOBoost engine experiences sudden loss of power, stalling, and violent vibrations while driving, often without warning, leading to dangerous situations on highways and hills.
$4,000–$8,000est. engine replacement · 12–20 hrs laborGet local quotes - 3
Brake system failure with sticking calipers and reduced stopping power
10complaintsSafety riskBrakesFront and rear brake calipers stick or fail intermittently, causing grinding noises, uneven wear, and reduced stopping power, especially after the vehicle is cold.
$250–$700est. brake caliper replacement · 1–2.5 hrs laborGet local quotes - 4
Water Pump Failure Leading to Engine Damage
8complaintsSafety riskEngineThe internal water pump leaks coolant into the engine oil, causing engine overheating, loss of power, and eventual engine failure.
$400–$1,400est. water pump replacement · 2–6 hrs laborGet local quotes - 5
Sudden unintended acceleration due to throttle or pedal issues
5complaintsSafety riskOtherThe vehicle experiences sudden unintended acceleration while stopped or at low speeds, often requiring emergency maneuvers to avoid collisions.
- 6
Suspension Toe-Link Failure
5complaintsSafety riskSuspensionThe rear suspension toe-link fails without warning, causing the vehicle to swerve uncontrollably and potentially leading to accidents.
$150–$1,200est. suspension diagnosis + repair · 1–5 hrs laborGet local quotes - 7
Air bag system failure or non-deployment during collisions
4complaintsSafety riskElectricalAir bags failed to deploy during collisions or the air bag warning light remained illuminated without deployment.
- 8
Engine Overheating and Coolant Mixing with Oil
4complaintsHigh severityEngineCoolant leaks into engine oil due to water pump failure, causing overheating and engine damage.
$150–$1,200est. cooling-system diagnosis + repair · 1–6 hrs laborGet local quotes - 9
Fuel Tank Leak
4complaintsHigh severityFuel systemThe plastic fuel tank develops leaks at the seams, causing a strong fuel odor and posing a fire risk.
$300–$1,200est. fuel line/tank repair · 2–6 hrs laborGet local quotes - 10
Seat control failure on driver's or rear passenger side
2complaintsMedium severityOtherDriver's seat controls stop working, preventing adjustment of seat position, or rear passenger seat fails to latch securely.
- 11
Transmission and Power Transfer Unit (PTU) failure
2complaintsHigh severityTransmissionThe transmission shifts awkwardly and the PTU fails, requiring replacement. This issue is reported to be common in the 2010 Flex.
$200–$2,500est. drivetrain diagnosis + repair · 1–8 hrs laborGet local quotes - 12
Turbocharger Failure Due to Faulty Oil Separator
2complaintsHigh severityEngineTurbochargers fail repeatedly due to excessive oil buildup caused by a faulty oil separator, leading to engine smoke and loss of power.
$1,200–$2,800est. turbocharger replacement · 4–8 hrs laborGet local quotes
Other years & sources
Data source: U.S. National Highway Traffic Safety Administration (NHTSA) owner complaints and recalls. Problems are clustered and ranked from the complaint record; occurrence counts reflect corroborating complaints, not total incidence. Vehicle image is illustrative. Repair-cost figures are typical U.S. independent-shop ranges (parts + labor) for the class of repair shown — actual quotes vary by region, engine, and diagnosis; always confirm with a local shop.