Truck lost all fluid from transmission. Ford replace seal in transmission after sitting at dealer for nearly 3 weeks. Since that time, I have made multiple complaints to local dealer about engine stumble on hard acceleration. Dealer replaced air deflector per Ford service bulletin. Truck still stumbles on hard acceleration. (06/01/2013) current mileage 40,900.

- Ooltewah, TN, USA

The contact owns a 2011 Ford F150. The contact stated that while driving 65 mph and attempting to change lanes, the vehicle lost acceleration power. The failure was experienced several times. The vehicle was not taken to the dealer to have a diagnostic performed. The manufacturer was not made aware of the failure. The failure and current mileage was 48,000.

- Milano , TX, USA

The contact owns a 2011 Ford F-150. The contact stated that while shifting gears, the vehicle would violently lunge forward without warning. The vehicle was taken to the dealer where the failure was unable to be replicated. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure mileage was 14,000 and the current mileage was 40,000.

- Litchfield, IL, USA

The contact owned a 2011 Ford F-150. The contact stated that while driving approximately 35 mph, the vehicle hesitated to accelerate. The failure recurred intermittently at different speeds. The vehicle was towed to the dealer for diagnosis three different times. The technician was unable to diagnose the failure. Additionally, the contact stated that the fuel gauge would not display accurate fuel readings. The vehicle was taken to the dealer for diagnosis. The fuel sensor was replaced. The vehicle was not repaired. The VIN was not available. The approximate failure mileage was 4,000.

- Donalds, SC, USA

The contact owns a 2011 Ford F-150. The contact stated that whenever shifting from first to second or from third to fourth gear, the transmission shook violently. The vehicle was taken to the dealer where the technician was unable to determine a remedy the failure. The manufacturer was made aware of the failure. The vehicle was not repaired. The failure mileage was 15,406 and the current mileage was 21,500.

- Essex, MD, USA

An example of what happens is this: Traveling along at 45mph, and pull out to overtake a slower vehicle, you accelerate aggressively. Upon doing this, the truck seems to stumble like it's hunting for the appropriate gear (@ about 45- 50mph). Also, it feels like an engine mis-fire. It's a disconcerting feeling that the truck does not accelerate as it should when you need it the most.

- Hershey, PA, USA

Loss of power while attempting to pass on three separate occasions. In all occasions I had to pull over and turn the vehicle off, let sit for a few minutes and then restart the vehicle to continue.

- Wynne, AR, USA

After 4 hours of steady highway driving upon attempting to pass a vehicle the truck failed to downshift, lost power ( requiring me to abort maneuver) and began bucking... there was no cel. Took the car to the dealer and they inspected the truck found no codes and said no problem found. They said they reloaded the programming for the transmission. This vehicle has experienced this problem numerous times since the first occurrence. Always happens when accelerating and creates dangerous loss of power at critical driving periods.

- Columbia, MD, USA

The vehicle just doesn't accelerate without hesitating.

- Minot, ND, USA

I have a Ford 2011 FX4 ecoboost. Whole truck started shuddering as I was getting onto the southwest freeway. Check engine light was flashing and vehicle had loss of power. Was able to coast and drive slow to the next exit where I pulled into a gas station and turned the engine off. I started the truck again and it seemed ok but the shuddering happened again on the way home and this time the check engine light stayed on. Took it to the dealership where the code was pulled and they replaced the catalytic converter. Same thing happened to me (shuddering and loss of power) again at 30K miles 3/4/2013 where this time they replaced a ignition coil and spark plug. And a third time at 34K miles 4/27/2013 and it is back in the shop today. When this happens it is very dangerous driving on the freeway when you cannot get the truck to drive without shuddering and jerking anytime you give it gas. Something needs to be done before anyone gets hurt. The dealership so far has been fixing whatever the code states, however there is a underlying condition that is causing this to happen that needs to be addressed.

- Spring, TX, USA

I was driving along hwy 95 in Georgia for several hours early one morning. I went to pass a semi and lost all power. The truck rpms jumped up while the transmission down shifted to 4th gear but the truck did not accelerate. I had to get back into my lane in an abrupt way causing traffic to re-act and allow me back in. This has happened almost a dozen times since then. Ford has been issuing tsb for a fix but none of them work. This is only happening on the 3.5L eco-boost motor. They are now in their 3rd model year of this truck and are still having this problem, it is only a matter of time before someone gets seriously injured. The timing of when this happens is un-predictable and often leaves no codes for the dealer to troubleshoot, so you get sent on your way with "could not replicate problem". Ford has been claiming it is condensation in the inter-cooler, has issued computer updates numerous times, now they have released and upgraded inter-cooler, but the problems are still happening.

- Janesville, WI, USA

My truck is equipped with the ecoboost 3.5L engine. Twice now I have attempted to accelerate and had the truck lose power and shake violently, creating a very dangerous situation. The first time was attempting to pass another vehicle. Weather conditions were warm (75 degrees F) with light rain. I pulled out to pass and attempted to accelerate when the truck suddenly acted as if the gas was shut off. It then began to shake and shudder violently as if the rear axel was being ripped from beneath it. I was able to fall back behind the vehicle I was attempting to pass, out of the way of oncoming traffic, and pull to the side of the road. After shutting off and restarting the truck, it seemed to run normal. The dealership service tech inspected the truck and stated it is a problem Ford is aware of (in wet conditions), but has no fixes. The second time I was attempting to enter the interstate from a rest stop into a single lane construction zone. The weather was cool (45 degrees F), dry and sunny. I attempted to accelerate to enter the highway and the truck acted as it did on the first instance. I was forced to pull off of the lane between two large construction pylons in order to avoid being struck by a tractor/trailer. The supplied dates, mileage and speed were from the most recent incident.

- Marseilles, IL, USA

While traveling down I-55, towing my travel trailer on a trip from St. Louis, mo to gulf shores, al, vehicle experienced a total loss of power on the interstate. I had been driving multiple hours in the rain when in jackson, ms, I had to let off the gas to allow other vehicles to merge onto the highway. When I re-applied the gas, the vehicle started shaking violently and would not accelerate. This caused the vehicle to lose speed and drop from around 60mph to 35mph on the interstate. After letting off and re-applying gas about three times the vehicle finally recovered and I was able to continue on my way. Luckily the other drivers on the highway were able to avoid me and I was not rear-ended or otherwise caused a serious accident.

- Hillsboro, MO, USA

Traveling at speeds above 50 when hard acceleration vehicle goes into limp mode becomes very dangerous have almost caused major pile up due to loss of power and total loss of vehicle control this vehicle and others like it are going to start killing people. All over the internet people are complaining about same problem and so far Ford has not recalled these vehicles and that is very concerning. Please help before many people are killed.

- Tallahassee , FL, USA

Began to notice rough shifting a lower speeds (30 - 45) at about 12,000 miles. Over time it became more pronounced and feels like the engine is lugging at this speed. The transmission causes a shudder when shifting up or down as if the transmission is having a problem getting into gear. Left the truck at the dealer for 3 days and they told me they could not replicate the problem. I think the streets they were driving were so rough that they couldn't feel the shudder. I was told that it may be a problem the computer is having synchronizing the fuel system and the engine RPM's. don't know about that but the problem still exists at 20,000 miles now.

- Georgetown, TX, USA

Surging at low speeds when coming to a stop. Feels as though the transmission is not downshifting and requires hard braking to prevent vehicle from moving into an intersection, or a car stopped ahead going in the same direction. This has occurred twice. The second time I almost hit the car stopped in front of me.

- Stow, OH, USA

Under hard acceleration into traffic or when passing, vehicle will suddenly lose power and go into a "limp mode." This condition is thought to occur because of engine misfire and several factors have been identified that can cause this in the ecoboost 3.5L V6. The dealer has replaced ignition coils with no success in correcting this issue. My service manager shared with me that Ford engineering is well aware of the issue and has yet to come up with a solution to correct it. In the meantime, my family is placed at risk of an accident because there is no way to predict when the engine will suddenly lose power when you need it most for passing or merging situations. This becomes even worse when pulling a trailer. NHTSA should demand that Ford immediately recall and repair these vehicles, or replace them until an appropriate solution is found to remedy the misfire condition and resultant lost of power.

- Chesterfield, MO, USA

When putting truck in reverse after going forward or put in forward after backing up, clunk or chirp noise from under vehicle. Could be driveshaft or rear. Waiting for warranty servce.

- Hampstead, MD, USA

I made a left turn from a traffic light stop, as I was accelerating on a moderate rate, the engine "took off" (unintended acceleration) and immediately accelerated to ~50+mph. I switched transmission into neutral and applied the brakes and slowed down to the speed limit, ~35 mph. I checked to make sure the accelerator pedal was not stuck on the floor mat (it wasn't). I reengaged the transmission and the acceleration started immediately again. This unintended acceleration occurred three times in a stretch of about 2 miles or so, until I had a clear, safe place to pull over. The check engine light did not come on, at least not that I could notice. After I stopped the truck and started up again things were fine. I tried to "recreate" the situation by suddenly accelerating, but to no avail. I have scheduled an appointment with the dealer. The vehicle is a 2011 Ford F-150 pickup with 3.5L ecoboost engine.

- Roy, WA, USA

2011 Ford F-150 raptor supercab; <12,000mi, happening since new. At slower speeds, when transmission is allowed to shift up to at least 3rd gear and back down for a slow maneuver and/or stop, under normal re-acceleration conditions (normal- <2000rpm), as vehicle accelerates and shifts from first gear to second, it will seem to presume a 1/2 to 1 second "neutral" state, revving RPM's prior to engaging second gear with a very abrupt and pronounced "slam" shaking entire truck. Symptoms can be slightly alleviated or avoided by letting off accelerator prior to shift, allowing to coast up to second gear through self power at idle RPM. Not feasable for normal every day driving conditions. Appears to be caused by lack or sudden loss of hydraulic pressure.

- Fort Madison, IA, USA