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really awful
Crashes / Fires:
3 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
42,759 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.

2011 Ford F-150 engine problems

engine problem

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2011 Ford F-150 Owner Comments (Page 12 of 17)

« Read the previous 20 complaints

problem #113

Jul 312013


  • 38,578 miles


Attempted to pass a car. Speed at time of attempt was 55mph. Time 2:20 P.M. and partly cloudy. Two lane road but had plenty of time to pass or an accident could have occurred. Pushed down on accelerator and the engine actually decreased speed/significant deceleration. I let up on gas pedal, maintained speed then was gradually able to pass. Think the turbo had stalled. This had happened once before, shortly after I purchased the truck. At that time I was merging onto interstate and it stalled out, for a shorter duration. After the July 31 incident, I took the truck to Ford to inquire about the issues some owners have had on the eco boast engine, which I have. No codes appeared so I was told they couldn't do anything. Then talked to regional customer service and got the same story. I am very concerned as I use the truck to tow a 26' trailer. When the eco boast turbo works, I have plenty of power to merge or pass. The above experience was scary and I did not have the trailer behind me at the time. Now I feel I can not reasonably depend on it to work as it should. I think it is the turbo but it could be the electronic gas pedal, or the transmission but I really do not think these are the issue. Please help! thank you.

- Kalamazoo, MI, USA

problem #112

Sep 052013


  • 69,100 miles
While accelerating to 75mph or so, up slight hill from 65-70 mph went to pass a vehicle then truck lost vast majority of power even with all the way down and began to violently shake. Could have easily cause accident since wasn't abble to accelerate as planned to match speed of other lane. Check engine light came on. Truck continued to shake violently off and on for next mile before stopping. Problem is still ongoing under any moderate acceleration that goes over ~2000 RPM

- Lake Forest, CA, USA

problem #111

Jul 172013


  • 15,800 miles
On several occasions and more frequently as of lately, I am losing acceleration capability when I am trying to accelerate at any speed. When I try to accelerate from a stop or uphill, I feel like the engine won't go or is bogging down. To try and compensate, I try to accelerate more which only seems to make the problem worse. I have already taken it to the Ford dealer and they replaced a part on the transmission, but the problem still persists and is only get more frequent.

- Prescott, AZ, USA

problem #110

Aug 172013

F-150 4WD 6-cyl

  • 25,000 miles


Was on the interstate just West of St. Louis, driving at 70 mph. Was a damp rainy day. Pulled in to the passing lane to pass a semi and truck lost power, went into "limp mode" with check engine light on. I pulled back into my lane and then off to the shoulder. Turned the truck off and sat for 5 - 10 minutes. When I powered it back up, the check engine light was off. I was able to pull back onto the highway and had full power for the rest of my trip. This is the third time this problem has occurred with this truck. Both other incidents were in damp or rainy weather at highway speeds when passing or merging onto highway.

- Sun Prairie, WI, USA

problem #109

Aug 082013


  • 52,500 miles
Had a car pull into my lane, tried to accelerate to move over with out causing a dangerousness situation of a car coming up in the lane I needed to be in to avoid the idiot moving into my lane but car lost power. Thankfully the car in the next lane over saw the issues with the car moving over into me and gave me room, I'm sure they didn't expect my car to slowdown due to the loss of power. This car has the ecoboost engine 3.7 liter

- Palm Beach Gardens, FL, USA

problem #108

May 162013


  • 30,000 miles
I was driving to Florida in my 2011 F150 ecoboost and on the highway at about 65 mph my truck started stalling and lost power miss firing and would not go over 10 mph causing me to pull over on the shoulder. I then turned the truck off and back on 10 mins later and it began to run fine agian. I took it to Ford and they say no engine codes went off so they did not know why it would do that.

- Phenix City, AL, USA

problem #107

Aug 112013

F-150 6-cyl

  • 15,000 miles


On August 11 2013, after about 2hrs of driving my 2011 Ford F150 with the ecoboost engine at a constant 72 mph I was coming out of a toll booth when the truck started to shudder and lose power this happened for about a minute, the truck regained power and continued.coming home on August 18th, again after alittle over 2 hours of driving, I went to pass slower traffic when the heavy shake, stutter and power loss happen.traffic behind almost ran me over.the stuttering/loss of power continued for about 3mins, in which I could not get to the side of the road and almost got my wife and I rear ended.Ford Motor Company has had many tsb for a possible fix on the 3.5L ecoboost engine but they have not worked.please help us before someone get killed.

- Ashford, CT, USA

problem #106

Mar 082013

F-150 6-cyl

  • 16,729 miles
Issue started again on 10 Aug. 2013. When under mild to heavy acceleration (such as merging onto interstates) the engine develops a significant miss and shudder. Vehicle was repaired once on 20 Mar. 2013 under tsb # 13-3-3. weather does not appear to be a factor. The "miss" was so severe with a K&N air charger high-flow intake kit installed that I had to reinstall the stock system. This was a none issue eventually because the Ford dealership would not place the vehicle on diagnostics until I had reinstalled the stock kit.

- Laurinburg, NC, USA

problem #105

Aug 172013

F-150 6-cyl

  • 46,000 miles
On I-20 East headed to augusta, ga from Alabama I pulled into the left lane to pass and the engine starts sputtering, skipping and lost almost all power. It happened 3 times yesterday. It was in a light rain and since there was light traffic I was able to slow down and get the engine to recover each time. This could be a real danger in heavy traffic. I tested it again this morning (08/18) and if you try to accelerate quickly it just about shuts down until you let off.

- North Augusta, SC, USA

problem #104

Jul 012011


  • 85,000 miles
The contact owns a 2011 Ford F-150. The contact stated that while driving at various speeds, the vehicle suddenly lost acceleration power. The contact also stated that the failure recurred intermittently. The vehicle was taken to multiple dealers where the failure could not be replicated. The vehicle was not repaired. The manufacturer was contacted about the failure. The failure mileage was 85,000. The VIN was not available.

- Madison, WI, USA

problem #103

Jan 202013

F-150 6-cyl

  • 40 miles


Well I have an issue with my trucks I have purchased from Ford. Well in August of 2011 I purchased the new F150 with ecoboost. The truck drove like a dream for a while then I started having issue, with the transmission, then engine losing power. This happen about 4 time during the life of the truck.the last time was in January 2013, it was the last straw for me. The reprogrammed the trans/computer and put a wind deflector in the front of the intercool. Still lost power on a road trip on the way back home from S Carolina. Mind you the truck was in the shop for tran/engine/the right fender had to be adjusted it was misaligned, the bed of the truck same thing. This lost of power almost caused me to have a accident because I was merging onto the highway. I also had to sunroof replaced as it was vibrating the whole truck when moving. The driver seat track was replaced and the sliding glass window in the back was replaced too. The defrost stopped then the window stopped sliding. I stopped driving the truck so I could get rid of it I have a 2013 limited and have some of the same issue. Now that I have a new 2013 vehicle I experience some of the same issue.

- Lithonia , GA, USA

problem #102

Aug 082013

F-150 6-cyl

  • 88,200 miles
Loss of significant power under slight to moderate acceleration, engine shutters violently, shakes and miss-fires. Check engine light flashes. Engine seems to run on 50% power loss, letting off accelerator for awhile then engine seems to recover temporarily until additional power is needed. Unable to have any confidence to pass any vehicles on grades. Quite possible for complete power loss under full acceleration as the engine misses so bad that it actually slows down and looses RPM's. I have owned this truck since new. Symptoms started in dry climate, no rain and have continued to get worse as I have entered into rainy areas with humidity.

- Scottsdale, AZ, USA

problem #101

Aug 102013

F-150 6-cyl

  • 41,000 miles
Went on a 350 mile trip, I was at a stop light and when I went to accelerate the truck lost all power. I have one of the ecoboost engines. The engine did fix itself and I continued with no other problem, this is the first time I experienced this problem. 2011 Ford F150 king ranch.

- Charlotte Hall, MD, USA

problem #100

Jul 282013

F-150 6-cyl

  • 24,650 miles
Second occurrence of the engine losing power while towing a camper over 100+ miles at highway speeds then adding power to climb a hill. Driving 65 mph on the highway, over a 1.5-2 hrs drive, approaching a hill while towing a camper, accelerated to climb the hill and the vehicle again, dropped from 65 to 40 mph in about 30 seconds. Engine stuttered and would not respond to throttle control to gain speed to climb the hill. Took vehicle into dealership no problem found, about a week later, there was an inefficient catalytic requiring the replacement of the left catalytic converter. This occurred post having the ecoboost fix that Ford Motor Company stated would resolve the problem and it is still occurring. Odbc 2 data logger captured the incident recording engine speed, engine RPM, and engine load (%).

- Rochester Hills, MI, USA

problem #99

Jul 152013

F-150 6-cyl

  • 35,000 miles
Ecoboost engine. Loud clattering on cold start. Runs very rough, exhibits propensity to stall when idling, and very sluggish acceleration coupled with transmission issues. Example 1: coasting on the freeway with traffic around 40mph, shifted lanes, then made attempt to accelerate and pass another vehicle, but the vehicle did not downshift. Accelerator will be down to the floor, and truck will remain stuck in a low gear (like 6th) and go acceleration...after a few more tries, and a few seconds later, the transmission will slam into 2nd gear, shaking the entire truck. At this point, the turbos kick in and the truck takes off like a rocket. Creates 2 dangerous situations, a potential rear-end accident by the lane change without acceleration, and then the sudden, rapid, unpredictable acceleration of being randomly thrown into 2nd gear. Seen various other incidents like this in other scenarios and various gears. Accelerating out of a traffic circle, or out of a turn, is an easy way to see the problem. Truck has basically lost its ability to accelerate/downshift on demand. Example 2: stopped at a stop sign. When I then proceed into intersection...acceleration is very slow, then all of a sudden turbos kick in resulting in rapid unpredictable acceleration. Often times, the wheels will spin, and if the road is dry, the truck will bounce up and down all over the road! accelerator will in the same position the entire time. I have rapidly accelerated towards cars that I didn't want to get that close to. I now have to stay even further away from cars to maintain a safe distance due to unpredictable acceleration. Frustrating, because the problem is frequent now, but inconsistent. I have 2 kids in booster seats, and now I have to be especially careful when I drive with them in this truck because I feel it's unsafe.

- Macomb, MI, USA

problem #98

Jan 112013


  • 33,000 miles
This is on the ecoboost F150. I was driving during a rain and had been around 70 miles. The weather was rainy. I went to pass a farm tractor on a 2 lane road and the vehicle stuttered and had no power to pass. I had to take evasive action and get back into my lane where there vehicle continued to sputter for approximately another 2 minutes. I took truck to Ford and they replaced a converter and cooler. Last Wednesday under similar conditions, the same thing happened again on a vacation trip. Oncoming traffic had to evade me as I tried to get back into my lane. It has been less than 10, 000 miles since last attempted repair was performed by dealer. Obviously the repair did not work and now I am left with a vehicle with an obvious design defect that Ford doesn't know how to correct. Under different circumstances, this could be a serious safety issue.

- Alabaster, AL, USA

problem #97

Mar 152013


  • 35,000 miles
When getting on the highway with pedal all the way down start to get shutter at 4100 RPM through 2nd gear and then when it is in 3rd gear at the same RPM it will shutter even worse and then sometimes the check engine light will come on and start blinking for up to a min and then the truck will not move at all.

- Hamilton, OH, USA

problem #96

Jul 192013

F-150 6-cyl

  • 48,633 miles
This truck has a very bad habit of loosing power and throttle response after driving for extended periods in heavy rain/high humidity. This problem occurred the second day I owned this truck (original owner) and has happened several more times over the past 2 years. The most recent time it occurred I was merging onto the highway and the truck started to shake and lost all power, I ran out of room to merge and had to steer to the right of a vehicle that was in the break down lane...I had nowhere to go! my dealer has attempted the service bulletin to correct this condition but to no avail. 3.5L ecoboost is a hazard to operate under the above listed condition not only to myself but other people on the highway!

- Westbrook, ME, USA

problem #95

Aug 012013

F-150 6-cyl

  • 75,443 miles
When mild-accelerating to get to the highway speed limit of 75 my Ford F150 ecoboost started shaking at 55 mph and at 2,500 RPM my truck starts shaking and was unable to control. I had to exit the highway and drive at a lower speed I figured it was another engine misfire that I had replaced recently on 8/2/13. I then proceed to try again on the freeway and at 55pmh it again started to shake and rattle cause me to drive on the feeder road for the remainder of my trip to work.

- Corpus Christi, TX, USA

problem #94

Jan 012012

F-150 6-cyl

  • 20,000 miles
Six months after I bought my truck I noticed a shuttering and hesitation while I was on the highway. The shuttering happens when I am cruising at 55-60 mph. More noticeably when the truck is climbing a slight incline on the road while lightly accelerating to maintain 60 mph. I had the dealer look at it 3 times in the last 2 years. The first time they reprogrammed the transmission and the computer. It did not solve the problem. Brought it back the second time and I went for a ride with the technician and he noticed the shuttering. He said there was no engine light and no codes to find out what the problem is. Finally the third time they said Ford is aware of the problem and there engineers are trying to find a solution. I also had problems with my transmission. I was slowing down to come to a stop and the transmission downshifted so hard I thought I got rear ended by the vehicle behind me.

- Hudson, NH, USA

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