What is the 2009-2013 Ford Flex Electric Power Steering (EPS) Failure and Assist Loss?

The 2009-2013 Ford Flex uses an electric power steering system that is prone to sudden failure, leaving the driver with extremely heavy steering that requires significant effort to turn. The power steering control module can overheat or fail internally, and the steering motor its… Repairs typically run $300-$1,300. Severity: high.

What is the 2009-2016 Ford Flex Electronic Throttle Body Failure Causes Limp Mode (P2111/P2112/P2119)?

The electronic throttle body on the 3.5L/3.7L Cyclone V6 uses a plastic-geared motor and integrated throttle position sensors. Contamination, gear wear and sensor drift cause the PCM to lose confidence in commanded vs. actual plate position, triggering failsafe cooling mode. The… Repairs typically run $300-$700. Severity: high.

What is the 2009-2019 Ford Flex Brake Booster Check Valve Failure?

The brake booster check valve fails, allowing vacuum to leak and causing a hard brake pedal and longer stopping distances. Some owners report a hissing sound from the brake area when pressing the pedal. Repairs typically run $50-$600. Severity: high.

What is the 2009-2019 Ford Flex Power Transfer Unit (PTU) Seal Leaks and AWD System Failure?

AWD-equipped Ford Flex models suffer from chronic Power Transfer Unit (PTU) seal leaks and eventual PTU failure. The PTU transfers power from the transaxle to the rear driveshaft and is sealed with halfshaft seals that deteriorate over time. When the seals leak, the PTU fluid lev… Repairs typically run $300-$2,500. Severity: medium.

What is the 2009-2019 Ford Flex Vista Roof Drain Tube Blockage and Disconnection Floods the Headliner?

The multi-panel Vista Roof is not sealed against water - it relies on a drip tray and four drain tubes that route water down the A- and C-pillars. On the Flex those tubes are prone to being crimped, kinked or, in some documented warranty cases, never connected at the factory at a… Repairs typically run $150-$900. Severity: medium.

What is the 2013-2019 Ford Flex MyFord Touch / SYNC 2 APIM Module Failure - Black Screen, Reboots, Unresponsive Touch?

Flexes equipped with MyFord Touch (SYNC 2, roughly 2013 onward) suffer failures of the Accessory Protocol Interface Module, the computer mounted behind the 8-inch center screen that runs the infotainment OS. Symptoms escalate from slow response and Bluetooth dropouts to spontaneo… Repairs typically run $300-$1,400. Severity: medium.

What is the 2011-2019 Ford Flex Front B-Pillar Door Trim Applique Detaches From the Doors (Recall 25SB8)?

The black B-pillar applique bonded to the trailing edge of the driver and front passenger doors can separate and fly off. NHTSA opened an investigation in August 2025 after complaints on 2019 Flex vehicles and then widened it to 2011-2018 Flexes that use similar trim, and Ford re… Repairs typically run $0-$250. Severity: medium.

What is the 2009-2019 Ford Flex Front and Rear Wheel Hub Bearing Failure With Corrosion-Welded Hubs?

Sealed hub bearing assemblies on the Flex wear out and produce a speed-dependent noise that owners consistently describe as starting like a hum and progressing to a sound like aggressive snow tires, usually first noticed above 40 mph and changing pitch when the vehicle is loaded… Repairs typically run $230-$600. Severity: medium.

What is the 2010-2019 Ford Flex Intake Valve Carbon Buildup on the Direct-Injected 3.5 EcoBoost?

The 3.5L EcoBoost in the Flex (SHO-derived, EcoBoost/Limited AWD models) is direct-injected only, so no fuel ever washes across the back of the intake valves. Oil vapor pulled through the PCV system and exhaust residue from valve overlap bake onto the valve stems and seats. As th… Repairs typically run $500-$1,200. Severity: medium.

What is the 2009-2019 Ford Flex Power Liftgate Motorized Struts Weaken and Overload the Lift Motor?

On power-liftgate Flexes the gate is raised by two electric struts working with the drive motor and control module. The gas charge and internal drive in the struts weakens with age and cold weather, so the gate opens slowly, stops partway, reverses as though it detected an obstru… Repairs typically run $200-$900. Severity: low.

What is the 2009-2019 Ford Flex Door Ajar Warning Stays On?

The door ajar warning stays illuminated even with all doors closed, draining the battery if interior lights stay on overnight. Caused by faulty door latch switches that corrode or stick. Repairs typically run $30-$250. Severity: low.

What is the 2009-2019 Ford Flex HVAC Blend Door Actuator Gear Stripping Causes Clicking and Split Cabin Temperatures?

The Flex uses several small plastic-geared HVAC actuators (driver blend, passenger blend, mode/panel-floor-defrost, and recirculation) behind the dash, plus additional units for the rear climate zone. The position feedback potentiometer inside the actuator degrades and stops repo… Repairs typically run $120-$700. Severity: low.

Ford · Known Issues

2009-2019 Ford Flex Problems: 15 Known Issues

2009-2019 model years · 1,120+ owner reports · Updated September 2026

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According to Au7o's analysis of 1,120+ owner reports, the 2009-2019 Ford Flex has 15 documented known issues, with 6 rated critical. The most serious are Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage ($1,500-$7,000 repair), Electric Power Steering (EPS) Failure and Assist Loss ($300-$1,300 repair), Timing Chain, Guide and VCT Phaser Wear Causes Cold-Start Rattle on the 3.5 Cyclone ($1,800-$4,000 repair), Electronic Throttle Body Failure Causes Limp Mode (P2111/P2112/P2119) ($300-$700 repair), Brake Booster Check Valve Failure ($50-$600 repair) and Torque Converter Clutch Shudder and TCC Solenoid Contamination in the 6F50/6F55 ($1,200-$4,500 repair). The most commonly reported issue is Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage with 480 owner reports. Across all issues with published estimates, repair costs range from $30 to $7,000. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Ford Flex problems?

According to Au7o's analysis of 1,120+ owner reports, the 2009-2019 Ford Flex has 15 documented issues. The most frequently reported are: Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage, Electric Power Steering (EPS) Failure and Assist Loss, Timing Chain, Guide and VCT Phaser Wear Causes Cold-Start Rattle on the 3.5 Cyclone. Of these, 6 are rated critical and should be addressed promptly.

Is the Ford Flex reliable?

The 2009-2019 Ford Flex has 15 known issues documented across 1,120+ owner reports. 6 issues are rated critical: Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage and Electric Power Steering (EPS) Failure and Assist Loss and Timing Chain, Guide and VCT Phaser Wear Causes Cold-Start Rattle on the 3.5 Cyclone and Electronic Throttle Body Failure Causes Limp Mode (P2111/P2112/P2119) and Brake Booster Check Valve Failure and Torque Converter Clutch Shudder and TCC Solenoid Contamination in the 6F50/6F55. 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.

How much does it cost to fix common Ford Flex problems?

Repair costs for known Ford Flex issues range from $0 to $7,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage, typically costs $1,500-$7,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Ford Flex is the most reliable?

Reliability varies across model years of the Ford Flex. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2009-2019 Ford Flex with 15 documented issues documented across 1,120+ owner reports.

All 15 Known Issues

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Frequently Asked Questions

What are the most common Ford Flex problems?

Is the Ford Flex reliable?

How much does it cost to fix common Ford Flex problems?

What year Ford Flex is the most reliable?

Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage#

Timing Chain, Guide and VCT Phaser Wear Causes Cold-Start Rattle on the 3.5 Cyclone#

Electronic Throttle Body Failure Causes Limp Mode (P2111/P2112/P2119)#

Intake Valve Carbon Buildup on the Direct-Injected 3.5 EcoBoost#

Electric Power Steering (EPS) Failure and Assist Loss#

Front and Rear Wheel Hub Bearing Failure With Corrosion-Welded Hubs#

Brake Booster Check Valve Failure#

Torque Converter Clutch Shudder and TCC Solenoid Contamination in the 6F50/6F55#

Vista Roof Drain Tube Blockage and Disconnection Floods the Headliner#

Power Liftgate Motorized Struts Weaken and Overload the Lift Motor#

MyFord Touch / SYNC 2 APIM Module Failure - Black Screen, Reboots, Unresponsive Touch#

Door Ajar Warning Stays On#

Power Transfer Unit (PTU) Seal Leaks and AWD System Failure#

Front B-Pillar Door Trim Applique Detaches From the Doors (Recall 25SB8)#

HVAC Blend Door Actuator Gear Stripping Causes Clicking and Split Cabin Temperatures#

What is the 2009-2019 Ford Flex Internal Water Pump Failure Causes Coolant-Oil Mixing and Catastrophic Engine Damage?