Which parts fail
Components named in complaints (fuel pump, injectors, fuel tank, hybrid and EV propulsion).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2014 Ford Flex owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2014 Ford Flex. The contact stated that while her wife was driving at an undisclosed speed, she became aware that the electronic power steering was not functioning properly after the steering wheel jerked in the right direction. As a result, the driver lost control of the vehicle and collided with a dividing wall on the side of the roadway. The vehicle returned to normal functionality, but the failure became a regular occurrence. The air bags did not deploy. No warning lights were illuminated. A police report was not filed, and no injuries were reported. The vehicle was taken to an independent mechanic, who diagnosed a failure with both control arms. The vehicle was repaired, but the failure reoccurred. The vehicle was then taken to the dealer, who was able to duplicate the failure but was unable to provide a diagnosis. The vehicle was not repaired. …
The contact owns a 2014 Ford Flex. The contact stated that while stopped at a traffic light, the vehicle stalled. The contact attempted to restart the vehicle however, the vehicle failed to restart. There was no warning light illuminated. The vehicle was towed to the dealer where it remained. The contact was informed that the fuel pump module needed to be replaced. The vehicle was not repaired. The manufacturer was not contacted or notified of the failure. The approximate failure mileage was 104,000.
Driving down road at 45MPH, vehicle lost power, motor quite running. Due to being on 4 lane divided road, and cars all around, I quickly hit my hazard lights, put it in neutral and coasted best I could and was able to turn on a side road to safety. This was very dangerous. Dash lights were on, no warning lights, messages before, during or after event. Tried restarting vehicle and it cranked away. Figured out had to repush the push start button to keep it from cranking away longer. Towed to local Ford dealer. They determined cause to be Fuel Pump Driver Module failed, (explains engine stop since there was no fuel supply, and needed replacement. In addition I had another issue, they found water pump was leaking out weep hole. I then discovered they built the water pump into the engine block, behind the timing chain. …
Hello, I was driving my Ford Flex at 60mph yesterday with my 15 year old friend helping me move. The engine completely died for several seconds and continued running. That night the engine was idling rough which was a new symptom. Today, I made it to my destination and the car died, then it did not start after cranking. The Fuel pump module Aa8a-9d412-ca was faulty and now I am out $142+ from Ford to replace a part myself that is a known problem on the Ecoboost engines for this vehicle. This is a liability and I am seeking reimbursement for this known issue. Please issue a recall for this fuel pump module, everyone's safety is at risk that still has this faulty part installed that Ford has not addressed. Thank you for your time.
Failure of the vehicle to restart and idle. Vehicle began to slow down, wouldn't hold cruise speed setting, while driving on the highway; after exiting the Interstate in rural Colorado, it stalled completely. Dealer diagnosed a fuel pump control module failed and result is car only starts, short 8 second run, and shuts off. Replacement module solved the issue on my Ford Flex. Some Flex and similar models were issued recall for this item. Ford contacted, our Flex vin number is not on the recall as issued.
Approximately 2 months ago car would not start. Towed to dealer on Friday. Dealer evaluated it on Monday but car resumed starting. Retrieved car. This morning problem returned. Having already done a lot of research on this apparently common issue it seems most of the time it is the fuel pump control module located behind the plastic trim on the passenger side B pillar. A replacement part was acquired from a Ford Parts Dealer and installed into the car. Car starts and runs fine now.
fuel pump relay module. Vehicle shut off during driving without warning forcing panic and moving to side of road and had to tow vehicle. No incident happened but after replacement no longer had issue.
We were experiencing an intermittent electrical issue where the vehicle would crank but not start every time. The vehicle was towed to the dealership on two separate occasions and the mechanic was unable to properly test the vehicle and/or recreate the problem. After some further research, I found a recall on slightly older VIN numbers for this model Flex. The recall for the Fuel Pump Control Module: Fuel system, gasoline: Delivery: Fuel pump Recall date 2016-08-24 Recall no. 16V621000 Ford Motor Company (Ford) is recalling certain model year 2013-2015 Ford Taurus, Ford Flex, Lincoln MKS and Lincoln MKT vehicles equipped with 3.5L GTDI Ecoboost engines and 2013-2015 Ford Taurus Police Interceptor vehicles. A component within the fuel pump electric module (PEM) may overheat causing a loss of electrical power to the fuel pump. …
In August 2017 our Ford Flex stalled and would not start. We were going about 35 MPH on a country road. We had only owned it for a few weeks, having purchased it from varney Ford in newport, me. Had it towed to the dealer who kept it for two weeks and finally said it was fixed, blaming it on a broken shifter. He also reset everything by pulling a battery cable and his explanation sounded pretty vague. On nov 19, the vehicle cranked but refused to start in a parking lot. I had it towed to my local garage who has been very good to us in the past. He quickly diagnosed the problem as a bad fuel pump driver module and replaced it. The car has been fine since. I wouldn't be reporting except for the fact that EcoBoost Flex and taurus vehicles from the same year were recalled for failure of this module (NHTSA 16V621000, Ford recall 16s31). …
Tl* the contact owns a 2014 Ford Flex. While the vehicle was parked, the engine would crank, but the vehicle would not start without warning. The vehicle was towed to pittsville Ford (7155 friendship rd, pittsville, md 21850, [phone]), but the failure could not be duplicated. Months later, the failure recurred. The vehicle was towed back to the same dealer where the vehicle started up again without incident. When the failure occurred a third time, the contact disconnected the battery cable, waited a few moments, and the vehicle started without incident. When the failure occurred the fourth time, the same battery operation was not successful and the contact had to have the vehicle towed back to the same dealer. The contact associated the failures with NHTSA campaign number: 16V621000 (fuel system, gasoline). …
Related recalls
Fuel system, gasoline › Delivery › Fuel pump
Ford Motor Company (Ford) is recalling certain model year 2013-2015 Ford Taurus, Ford Flex, Lincoln MKS and Lincoln MKT vehicles equipped with 3.5L GTDI Ecoboost engines and 2013-2015 Ford Taurus Police Interceptor vehicles.
Remedy: Ford will notify owners, and dealers will inspect the fuel PEM part number and replace the fuel PEM, as necessary, free of charge. The recall began on December 1, 2016.
Fuel System complaints in other Flex years
Frequently asked questions
How common are fuel system problems on the 2014 Ford Flex?
NHTSA has 50 complaints about the fuel & propulsion system of the 2014 Ford Flex, 20% of the model year's 249 complaints. The component named most often is delivery › fuel pump (2 mentions).
Is there a recall for 2014 Ford Flex fuel system problems?
Yes — NHTSA recall 16V-621 (fuel pump, Aug 25, 2016). Recall repairs are free at authorized dealers.
At what mileage do 2014 Ford Flex fuel system problems start?
Half of the complaints with a recorded mileage happened before about 64,000 miles, and 3% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 0 fires and 1 injury to fuel & propulsion system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.