Driving on highway at 70mph, I saw my speedometer momentarily drop to 40mph. It did it again about 15 seconds later, and downshifted to about 4th gear momentarily. About a minute later, still at 70mph the speedometer dropped, and the transmission downshifted to 1st gear! my rear wheels locked up, and I lost control, and fishtailed for a few seconds. Luckily I had taken a half day vacation and was not in rush hour traffic. Still other cars had to swerve to keep from being hit. The dearlership was able to reproduce the problem, and replaced a moulded plastic module made by Continental that I think contained the transmission speed sensor. So it appears that when the transmission speed sensor signal is lost, the failure mode is to downshift to 1st gear no matter the speed of the vehicle.

- Dearborn, MI, USA

The contact owns a 2011 Ford F-150. The contact stated that the vehicle shuddered and failed to accelerate properly. When the failure occurred the check engine warning indicator illuminated. The failure occurred approximately nine times. The vehicle was taken to the dealer however was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was 58,296. The VIN was not available.

- Port Saint Lucie, FL, USA

The contact owns a 2011 Ford F-150. The contact stated that the accelerator pedal and the throttle would remain stuck. As a result, the vehicle accelerated without warning. The vehicle was taken to the dealer where the vehicle was repaired; however, the failure recurred. The repairs were unknown. The failure mileage was approximately 35,000.

- Chesapeake, OH, USA

Going up highway @ 55mph. Pulled around a vehicle to pass. Once, I was in the oncoming traffic the engine suddenly lost power, chugged, and was stumbling over itself. I then got back behind the vehicle I was passing. The 4 passengers and I were all quiet and then freaked out. After a while we pulled out and accelerated to go up road again, truck dogged out. We had no clue what was happening, but everyone was freaked out. We called birthday party destination to tell them we have vehicle trouble and can't make it. Drove it down hill all the while worried the engine was going to blow. Drove it directly to dealership who stated they had no clue and did not want us to leave it there. Said set up appt. 7-10 days out. Parked it until appt. Then they replaced all spark plugs. We also have had troubles with the braking. Where it suddenly takes extra effort and requires the driver to press hard on the brakes to get it to slow down. When we've driven it to Ford for repair they throw their hands up, act frustrated, like they do not have any clue as to what the problems are. We were hesitant to renew our state tags as it sits parked most of the time, since it chugged on level surface with no rain present, and the mechanics light came on. We feel scared driving it and it has remained parked for 3+ weeks. This is our newest vehicle, which looks new and yet we can't drive it. We're not made out of money, and can not easily replace this truck. We want Ford to fix the engine and the brakes, and not act like they have no idea about these problems. Ford wants us to take the loss on the vehicle value or continue driving it until something bad happens. They want nothing in writing. And, we do not want to sell the vehicle to a stranger. We'd allow you to inspect our vehicle....and drive it for a test drive. Would you want to be driving this vehicle with your young children as passengers?

- Littleton, CO, USA

I was driving at highway speed and tried to accelerate quickly to pass someone and the truck had major hesitation and shuddering. Continues to do this anytime you try to rapidly accelerate.

- College Station, TX, USA

Attempting to accelerate to pass a slower vehicle on the highway. Truck began shuddering and immediately decelerated to 50mph. Would not respond for approximately 75 yards, then would not accelerate over 60mph. Two vehicles (one of those vehicles was a tractor-trailer) following had to take evasive action to avoid rear-end collision. Exited the highway, put the vehicle in park. No warning lights were engaged. Weather was sunny and warm. Now vehicle is shifting very hard with a delayed engagement between 55-60mph.

- Newcastle, OK, USA

4 months ago I was driving on the highway and my truck went into limp mode, when I pulled over it was shaking violently with a check engine wrench on the instrument cluster. I shut it down and restarted it a few min later and it was back to normal. It was about 1 hour into my trip and around 32 - 35 degrees out, the roads were wet from snow fall. My wife and I own a home in nh so I travel two hours there and home every weekend. I haven't experienced the limp mode again but every time its wet and cold my truck will stall on acceleration, when at a light, and when on the highway the truck will stop accelerating when I try to give it gas. Again, the only common factor when this happens is the temp and moisture in the air, weather its raining, snowing, or the roads are wet. It will happen almost consistently at the 1.5 hour mark of driving. I've been to the dealer about the issue and they keep saying that the computer isn't showing any troubles, but this is getting aggravating. I have the 6.2 V8 so it our issues we are all having has nothing to do with the ecoboost engine. They need to start looking into something that both engines have in common.

- Winthrop , MA, USA

Hello, we wish to file a complaint on the 3.5 L eco boost engine in our 2011 F150. We have had numerous issues of shuttering, lurching, "lag", loss of power/lack of response. We first had this issue passing a semi on a 2 lane highway July 2014, no there was no fog/rain. It immediately shuttered, shook, lurched (coughed/sputtered) loosing power as we were passing. We made maneuvers to get to the shoulder where it struggled to stay engaged. We could have been hit head on, rear ended, side-broaded by the semi or worse, a combination of all 3. not to mention stranded. We have read of other issues, lawsuits and complaints being filed. The "shield" did not work (we have it, installed 8/2014 & flashed comp) it happened again two days in a row last week. The truck had no load either time, what if we were/are pulling our trailer? (the reason we bought this 60K truck, Ford said it would) now they claim spark plugs are fowled, that is a new "fix". (not covered) however that is a separate "carbon tracking" plug issue, (the next "issue" could be the ignition plugs fowling due to carbon tracking from the moisture issue) the problem is not plugs, the major problem is moisture! Ford is not addressing the moisture problem causing the "failure". they are fixing symptoms of the issue. The problem-moisture in the pistons water & engines do not mix! they have not fixed the problem which should fall under lemon law. Next there will be a terrible accident (if not fatal) due to the loss of power/response, what then" "..it was operator error, they slowed/stopped in the middle of the lane in traffic"..tests are exactly what they are; tests. We are every day life; drive the truck for transportation, not petal-metal 24/7, "grocery getters", value our truck. Since when are our lives indispensable or not important? when is any one going to do something about this safety issue before someone dies"

- Athol, ID, USA

I lose power when trying to pass a vehicle and the motor seem to shutdown and shakes.

- Columbia City, IN, USA

Lost power during acceleration, engine light came on instrument cluster. Truck had a severe miss. Drove about 20 miles in 5th gear and engine cleared up and light went off. Truck then missed during accelerations all the way home.

- Vinita, OK, USA

Since new, this vehicle has had an issue with a loss of power when accelerating hard. The latest incident, this past October, occurred at approximately 80000 miles. Plugs were bad prematurely and found that it was caused by water build up in a cac for the turbo chargers and there was a tsb. I was passing a car and lost power almost creating an accident. This time, fortunately, a light stayed on so they could diagnose the issue. The dealer did an update per the tsb but Ford refused to pay for the update due to the miles even though this issue has occurred numerous times before the warranty had expired. I am disappointed that the NHTSA did not make the recall mandatory in their previous investigation as I believe water being injected into an engine causing a power loss at a time power is called upon is dangerous.

- Franklin, WI, USA

I was driving on the highway at 60 mph and my rear end locked up and it almost had a major accident. I searched on line for recalls and on the 2011S they have been having problems with the transmission. I contacted Ford and they said that there are no recalls at this time. I found 5 recalls on 2011S F150:1 recall id 68928 electrical system,2 recall id 90589 exterior lighting,3 recall id 84274 structure body,4 recall id 91590 power train automatic transmission,5 recall id 90588 power train automatic transmission control module. The dealership checked my truck and told me that the valve body wiring harness is bad and the repair will cost around $850 to repair. The repair shop said that they have been having problems with the 2011 models but no recalls. This is a safety issue and its serious. If I had been driving 75 mph and my rear locked up on me, it would have not been good and it could have caused a major pile up including injury to myself and others and possible. This problem needs to be looked at and investigated before something happens. I appreciate your time. Thanks

- Cedar Hill, TX, USA

I have a Ford F150 ecoboost. This vehicle is very defective due to loss of power when driving on highway trying to overpass other vehicles..vehicle looses power due to moisture or humidity that enters the intercooler. It also makes the cylinders to misfire and the turbo. Due to that engine turns on and I have to power to my vehicle while driving which can cause an accident due to a sudden slow in the middle of the highway.. I have three kids and I wouldn't want any accidents happening due to this.. Ford needs to do something about this vehicles I lost my money on a worthless piece of you know.im very disappointed because I've spend so much money on repairs are not working.

- PeÑItas, TX, USA

I was accelerating up around 45 mph and the vehicle just died to a rough idle. Car behind had to swerve to miss me. I was told this is a throttle control board and is a common problem in Ford vehicles. Please tell Ford to recall this problem or they will not recall this part until someone dies it looks like.

- Blaine, MN, USA

I do not have the exact dates as to when the first incident took place. I was entering the E way merging into traffic when I tried to accelerate the vehicles lost power. I was fortunate not to be hit in the back by traffic I had to steer quickly to the side of the road. I have taken this vehicle and two others we own in on multiple occasions for this problem. The different fixes they have tried have not worked and yet I continue to be charged for these fixes. I feel if it is a known problem Ford should be taking care of the problem not charging me to try and figure it out. After reading online that I am not the only one having these problems as I have been told I felt it is important to file a complaint before someone is killed.

- Lansing, MI, USA

I was attempting to accelerate hard to merge into traffic onto interstate highway. When I pushed pedal to floor, the vehicle immediately slowed as if a governor had kicked in. Fortunately, I had room on shoulder to not get hit, but had to wait and pump pedal twice before it began to accelerate again. I have not tried to replicate the problem. I had an identical problem 3 years ago in another ecoboost Ford F150 that nearly killed me. I attempted to pass another vehicle and realized that I needed hard acceleration and the vehicle immediately slowed. There was no where to go, but fortunately my fellow motorists realized I had a problem and let me back into my lane without a multi-vehicle crash. I asked my dealer about that then, and was told that never had been reported. I immediately traded that truck for the one I have now that day.

- Jonesboro, AR, USA

My 2011 ecoboost F150 would sputter, shake and chug as I do a hard acceleration entering a highway or pass a vehicle. 4 times I have had my truck for service with the last 12 months for the same exact problem. My engine light will flash several times and then it will stay on till I take the vehicle in for service. 2 times the dealer has told me the problem is a turbo cooler issue and want to charge me $200 for some cheap lick and stick plastic air deflector. The other 2 times they have said I have a bad distribution wire and plug. First was on cylinder 3 and second time on cylinder 1. every time this has happened on a hard acceleration, its been during heavy traffic and I have had to pull of the road to avoid an accident. I have to now be very cautious when accelerating as I feel this truck is an accident waiting to happen. I hope someone can get this recalled as I know there is a lot of these trucks out there with the same problem.

- Grand Rapids, MI, USA

This is a Ford ecoboost truck that is turbocharged. During a heavy rain on interstate 95 I tried to accelerate from about 5 mph and the truck lost power and barely moved. After about 30 seconds the truck regained power and moved ahead. There were 2 other instances on this trip also during rain.. the second time the check engine light came on and stayed on. Upon returning home I searched the internet and found out I am not alone in this. There have been 3 tsb's to effect a repair. I made an appointment with the dealer. The engine code was a misfire on cylinder #6. tsb 13-08-01 was applied and I was billed $255.66. This problem needs a recall and repairs made before someone is badly hurt. I was nearly rear ended on the interstate. The problem is high humidity condenses in the intercooler (cac) or charge air cooler as Ford calls it. Then a sudden acceleration causes the condensed water to enter the engine grounding out the spark plugs on the left side of the engine causing a loss of power and stall. This has also been known to damage the left catalytic converter. Why must I pay to fix a design flaw? Ford needs to recall all of these trucks and repair them. This is not a mileage based problem but is inherent in all of them. During the right conditions it will happen.

- Loxahatchee, FL, USA

Vehicle stalls out like it is starving for fuel when you need to accelerate. It has stalled out when passing other vehicles and when entering heavy traffic on interstates. As of July 31, 2014, the truck has been back to the dealership at least 4 times for this problem. However, I continue to have the problem.

- Pollock, LA, USA

While attempting to accelerate and pass slower traffic on the highway, my 2011 F150 (4X4, ecoboost) truck lost almost all engine power, the check engine light started to blink, and the entire truck shook violently. Due to the truck's sudden deceleration without brake lights signaling it, oncoming traffic (including a large tractor/trailer) approached from behind rapidly and everyone had to brake abruptly to avoid a collision. I turned on my hazard lights, pulled the truck to the right shoulder and sat there for a few minutes while I called work to inform them that I would likely have to wait for a tow truck and be delayed. During that call, the engine light stopped blinking and the truck began running normally again. I reentered the highway when traffic was clear and the truck proceeded to run normally until I reached my workplace (roughly 2-3 more miles on the highway and about 5 miles through the city). A less severe instance of this occurred months before. In that case, there was a short power lag upon attempted acceleration, the check engine light blinked 2-3 times and then stopped blinking and the truck did not shake at all. The whole episode disappeared as quickly as it appeared after letting off the accelerator for a second or two. I believed it was a one-off thing. After today's much more severe episode, it is clearly not a one-off and obviously has the potential to cause an unsafe situation. Conditions (in central pa) at the time of today's occurrence (7:45am): Temp: 69F, humidity: 96%, overcast (not raining), wind: 0mph, truck speed: About 65mph, A/C: on auto set to 72F, load: Driver w/ personal belongings (no extra load).

- Mechanicsburg, PA, USA