definitely annoying
Crashes / Fires:
0 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
41,554 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2010 Ford Flex drivetrain problems

drivetrain problem

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2010 Ford Flex Owner Comments

problem #8

Sep 242016


  • 74,000 miles


Total motor failure when driving! transmission frequently slips. Motor had to be replaced. When pressure exhaust for ecoboost is redirected to cylinder 3 and 5 the head gasket fails allowing water to enter the head of motor which them steam fries the cylinders. This is very common in the 2010 Flex with ecbiost and need to be recalled asap! motors up to 100,000. Mine had 74000 when failure occurred.

- Land O Lakes, FL, USA

problem #7

Dec 232015


  • 72,000 miles
The contact owns a 2010 Ford Flex. While the vehicle was at the dealer for routine maintenance, the vehicle exhibited a transmission fluid leak. The dealer inspected the vehicle and advised that the transmission transfer case be replaced. The vehicle was repaired. The manufacturer was notified. The failure mileage was 72,000.

- Oak Ridge, NJ, USA

problem #6

Nov 152013

Flex 6-cyl

  • 37,500 miles
Original owner 2010 Ford Flex, ecoboost engine: Sudden loss of engine power with shuddering and stall in fast lane; up hill while passing at speed, 60mph to 20mph in seconds causing near collision from behind. Engine would not recover, 20mph in fast lane with semi's and speeding traffic, no pull-off area. Clear dry day, temperature around 55 degree. Not the first time engine shuddering experienced, but the most dangerous. Always occurs during acceleration (pulling out in traffic or passing, etc.). began to notice loss of power, whining and grinding noises from turbos about two weeks ago; subsequent catastrophic failure of both turbo chargers with billowing black smoke and oil dripping from exhausts. 38K miles, garage kept, all service points maintained, driven like grandmother since new. Fist the rear brakes locked up while driving at 18K miles, now engine failure at 38K. Do something ntsb before these vehicles kill someone!

- Georgetown, PA, USA

problem #5

May 012010

Flex 6-cyl

  • 4,000 miles


V6 ecoboost engine, has same acceleration / stalling symptoms as the F150 ecoboost happens several time a week, dealer was unable to help when it was under warranty. Started within months of purchase (new) in 2010. www.latimes.com/news/la-fi-hy-Ford-F150-ecoboost-investigation-20130526,0,2968753.story.

- Bedford, MA, USA

problem #4

Feb 152013

Flex 6-cyl

  • 72,000 miles
Sitting at red light..foot on brake...car lurched forward almost hitting car in front. This has happened two times. Third time March 29, 2013 car was coasting about 2-5 miles an hour...sudden acceleration so car lurched forward.

- Warren, Mi, MI, USA

problem #3

Oct 022012

Flex 6-cyl

  • 62,900 miles
Sudden leaking ptu caused failure and fluid to catch fire while driving 40 mph when exposed to exhaust directly under unit. Damage also resulted in transmission housing damage and severe powertrain failure. Ford had two tbs to replace ptu however not issued any recall.

- Arcadia, IN, USA

problem #2

Jun 012010


  • 10,000 miles
The contact owns a 2010 Ford Flex. The contact stated that the vehicle was violently jerking intermittently. The dealer made four attempts to duplicate the failure. The manufacturer was aware of the failure. No repairs were performed. The current mileage was 20,000. The approximate failure mileage was 10,000.

- Twinsburg, OH, USA

problem #1

Jun 012011

Flex 6-cyl

  • 30 miles
After owning the new vehicle for three months it started randomly slipping into neutral. At first, it did this when accelerating from a stop (which is very dangerous in busy intersections, left turns and merging). It now does it then and in addition at highway speeds - 50+. it also at times has engine surges when at a complete stop. It also surges and hesitates at 45mph to highway speeds, at times causing such a speed variance that it will shut cruise control off, slip into neutral and rapidly decelerate before correcting itself. There have been 5 repair attempts at a Ford dealership. They have not been able to determine the problem. They sent it home with me until it does it "all the time" or breaks down.

- Mequon, WI, USA

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