really awful
Crashes / Fires:
3 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
42,781 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 10 of 17)

« Read the previous 20 complaints

problem #156

Dec 302013

F-150 6-cyl

  • 39,000 miles


While driving at 55mph attempted to pass a vehicle on a two lane highway. Accelerated hard to pass and heard a loud metal on metal sound and lost power briefly. I was unable to replicate the initial incident, but now the truck randomly misfires and shutters under hard acceleration. Sometimes the check engine light will illuminate other times it does not. Dealer has been able to replicate the misfire but claims they can do nothing more. This is a safety issue because when power is needed most it is unreliable. I have escalated the matter to the corporate level at Ford but have not heard anything back yet.

- Lantana, TX, USA

problem #155

Dec 292013

F-150 6-cyl

  • 22,543 miles
When I tried to accelerate the truck started to buck violently and lacked power. After releasing the gas pedal and coasting a bit I was able to slowly regain speed. It was raining at the time and had been raining most of the day on 12/29/14. We have not had a recurrence but have not had any rainy days either.

- Hobart, NY, USA

problem #154

Jan 182014

F-150 6-cyl

  • 44,632 miles
Under acceleration between 60-70 mph, trucks starts shuttering and decelerating. The check engine light starts blinking and will blink for about a minute before staying on. I was nearly rear ended by a semi entering the highway today as I was trying to accelerate up to highway speed and at approximately 65 mph, the truck started decelerating and shuttering down to 35 mph before I could get enough power to maintain that speed and get off to the side of the highway.

- Cincinnati, OH, USA

problem #153

Aug 252011


  • 8,000 miles


The contact owns a 2011 Ford F-150. The contact stated that while driving approximately 50 mph, the vehicle became hesitant upon acceleration as the front end began shaking violently. The check engine warning light was also illuminated. In addition, the vehicle proceeded to accelerate forward at rapid speeds when driving 50 mph. The vehicle was taken to the dealer for diagnosis. The technician was unable to diagnose the acceleration failure. The vehicle was not repaired. The VIN was not available. The approximate failure mileage was 8,000.

- Benton, AR, USA

problem #152

Dec 242013


  • 61,148 miles
Coasting at low speed around 7mph I attempted to accelerate, instantly as I put my foot on the gas pedal, now not even making it to 10mph, the 3.5L ecoboost engine made an incredibly loud and hard bang and continued to grow louder and shake more violently. I came to a stop on the side of the road I shut down the truck to find oil spilling from the passenger side of the block. I had the truck towed to my local dealership and they found that two connecting rods had broke and destroyed the block. They is no concern from anyone at Ford about how this could have happened.

- Berwick, ME, USA

problem #151

Jan 072014

F-150 6-cyl

  • 42,505 miles
I was driving in highway traffic in the right hand lane at about 70-75 miles per hour. The weather was clear and the temperature was approximately 50 degrees. I encounter a slow moving vehicle and moved into the left hand lane and tried to promptly accelerate to pass a slower vehicle. When I attempted to accelerate the vehicle began to shake violently and go into a very rapid deceleration. The violent vibration of the entire vehicle and rapid deceleration made control a challenge. I moved to the right hand lane reduced speed to 50 mph and continued on to a Ford dealership to have the vehicle evaluated. The dealership found that 3 coils failed which caused the vehicle to vibrate and decelerate rapidly. I had the vehicle repaired.

- Aubrey, TX, USA

problem #150

Aug 192013

F-150 8-cyl

  • 78,296 miles


Truck has a 36 gallon gas tank. Fuel gauge does not go to full when filled. While driving fuel gauge goes to empty and message center comes on low fuel 10 miles to empty. Tank still has 20 gallons or more in tank. When filling with gas after this happens there is a high pressure release of gas fumes from the filler neck when pump nozzle is placed in the neck. An audible whoosh sound is made and the build up of gas fumes is consistent with every time the gauge and message center think the tank is empty. When starting the truck after this occurrence it takes 2-3 tries before the engine will start. The engine malfunction indicator lamp will come on for 3-20 minutes before going off. The Ford vehicle health report reads "engine, transmission, amp; emissions. The truck has been serviced 8 times with no corrective results. My major concern is the build up of fumes and the possibility of fire. It appears that Ford has known of this problem with trucks having 36 gallon tanks since 2008 based on comments from other owners when I googled my problem. To this date Ford does not appear to have a solution to the problem.

- Palm Coast, FL, USA

problem #149

Dec 202013

F-150 6-cyl

  • 33,800 miles
Vehicle once when first bought shut down during rain conditions when trying to excel. It was like you ran into a wall. Ford then said it was a wiring harness problem. It continued missing at times over the last two years. The same thing happened again in December while trying to pass a vehicle and it was again during rain conditions and just shut down in the road. We took it into the dealership and they said it was tsb 13 8 1 and made repairs. Vehicle now does not run right and gas mileage has dropped by at lest 2.5 mpg. Noticeable power loss. Vehicle is the Ford 3.5 echo boost. This is a big problem for consumers who want a truck and expect power with good mpg but should not be afraid to drive or get a supposed fix that's not what you have purchased. These situations will result into some very bad accidents. I cant imagine pulling something and this happens. Bottom line consumers deserve safe reliable vehicles. We love Ford and I hate I am having to complain but this is a real big problem. Please investigate. Thanks!!!!

- Hiawassee, GA, USA

problem #148

Mar 012013


  • 35,000 miles
Under hard acceleration on the highway, the engine began to cut out and misfire, then the check engine light began to flash. I took the vehicle to the dealership and they said the innercooler had failed and needed to be replaced. Now, at roughly 55,000 miles it has begun to do it again, I had noticed it some before, but now it is worse. I took my 2011 F150 with the ecoboost to the dealership again and they said a tsb had been written and they changed the replaced the lower air deflector. This actually made the problem worse. At wide open throttle from a stop to about 80 mph, every gear will cut out and sometimes put the engine into a protection mode beginning around 4,000 RPM. If it shakes and shudders made enough the check engine light will flash, and now it has come on and stayed on. It has been very dangerous if I pull out to make a pass and then the engine shuts down and I can no longer accelerate. This has happened dozens of times, and has been addressed twice now by the dealership without any fix.

- Goshen , KY, USA

problem #147

Oct 072013

F-150 6-cyl

  • 35,500 miles
Returning home from a weekend camping trip with my family and pulling a travel trailer via I-81 in va, I depressed the accelerator approaching a long hill, and abruptly lost all engine and drive power, the engine shuddered violently, the transmission downshifted to lower gear and the check engine light flashed a few times. We had absolutely no power and I thought the engine was going to shut off. I was in the 2nd lane from the right and had to quickly move to the right lane then to the shoulder to avoid being hit from behind. This was very dangerous while pulling a 34' travel trailer. I had to pull the vehicle to the shoulder and stop completely to regain control. I had to put the truck in park and turn it off before it returned to somewhat normal drivability. While continuing to climb the uphill grade, the engine misfired and hesitated constantly. I could only apply gently pressure to the accelerator to keep the vehicle moving. Once over the hill the vehicle picked up speed and returned to normal drivability for the remainder of the trip. The same exact problem occurred again a few months later while driving South on rt-4 in md with my wife, and not pulling a trailer. This time I didn't shut the engine off, but had to pull to the shoulder to regain control and engine power. As I continued on RT4 the engine misfired and hesitated several more miles. Once at my destination I turned the vehicle off, then upon departure the vehicle operated more normal, but experienced misfire and hesitations several mile returning home. The next day the vehicle operated normally, but I took it to the Ford dealership to have it repaired. This is a very unsafe situation and makes me very leary driving this vehicle on a normal basis. If I was accelerating while crossing the highway and this problem happened, there is a great chance of getting into an accident or causing one.

- Huntingtown, MD, USA

problem #146

Dec 202013


  • 48,000 miles


My truck has shuddering problems during acceleration to pass. The weather was rainy and very wet. This is not the first time I have experienced the problem. While visiting Louisiana in the summer of 2012 I experienced the same issue and while in san antonio, I had the catalytic converter replaced.

- Sandusky, OH, USA

problem #145

Dec 282013

F-150 6-cyl

  • 47,000 miles
I approaching an intersection and let off the gas, and started to slowdown several hundred yards before coming to intersection. The F-150 suddenly began to accelerate without my foot on the gas and my foot apply as hard as I could to the brake. The truck was accelerating on own. ABS kicked in and pulsed. But again truck was accelerating without my foot on the gas I complete made sure foot was removed and both feet on brakes. Attempted to pump and immediately after relating from brake as pumping to try and stop as hard stop didn't work it was like it was building up and shoot out like a bullet and hit car in front me. Once hit then quit accelerating. The front lifted up and full accelerating but feet were both on brakes. Lucky no one was hurt. Small damage to both vehicle because was as low speed intersection. If there wasn't a vehicle in front me. I would shot into intersection where only who knows what could have occurred to myself and others. This was a life threatening situation, that could have gone really bad.. end result could have been fatal. This needs to be investigated by Ford and no one else should be injured or lives taken from an issue that needs immediate attention and resolution to the vehicle owners that are scared to drive there vehicle because of this occurrence. Ford needs to make this right and make sure all vehicles this is reported on are safe or taken out of commission to make our roads safe for others and drives. [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Leeper, PA, USA

problem #144

Oct 012013

F-150 6-cyl

  • 72,000 miles
While accelerating up a hill, the engine began to misfire and would not accelerate properly and actually slowed while the service engine light blinked. I was forced to pull off the highway, shut the engine off and restarted. The check engine light did not re-light and I continued on normally until attempting to pass a vehicle when the same malfunction occurred. This happened repeatedly over the past 3 months while attempting hard acceleration until it was returned to the dealer for repairs. The dealer installed a "deflector" to prevent moisture from entering the turbo or aftercooler and reprogrammed the computer. Upon leaving the dealer, it was evident that the repairs did not work and the problem became worse. The engine misfires constantly resulting in an unsafe vehicle.

- Imperial, PA, USA

problem #143

Jan 102013


  • 11,500 miles
We were merging onto the highway outside of St. Louis mo and when the accelerator was fully depressed the engine started to misfire and power was reduced. A blinking cel was displaying on the dashboard. It seemed as though the turbo system was not adding any extra charge to the ambient air. There was a pronounced vibration to the vehicle that seemed to originate from the engine/drive train. Luckily there as not a lot of traffic at the time and our poor acceleration did not result in an accident. My solution was to manually select the gears and drive at much higher RPM. This smoothed the misfire and we had an adequate amount of power to keep up with traffic. After about 10 minutes everything smoothed out and the misfire was gone. Truck behavior returned to normal. The weather that day was a pleasant 60 degrees and sunny. The previous day we drove from central Ohio to St. Louis through much rain and fog. Since we were on vacation and away from home we did not take the truck to a dealer to be serviced. The problem has not occurred since then. There was one previous occurrence at a previous date. I don't know exactly when it was. We were traveling home to vt from Ohio. We had been driving for many hours, mostly on highway/cruise control driving. We had just gotten off the interstate highway and were on state highway. I went to pass a slower vehicle in my lane and upon depressing the accelerator the engine seemed to misfire (RPM went up but power delivery fell flat). I stepped off the gas pedal and slowly pressed a second time and this time the truck responded as expected. There was no cel this time. Each of these incidents occurred with my entire family in the vehicle. We were not very happy about it and did not feel safe at the time.

- Essex Junction, VT, USA

problem #142

Oct 032011

F-150 6-cyl

  • 12,000 miles
I was driving my 2011 Ford F-150 4X4 with the 3.5 liter ecoboost engine on hwy 12 in buxton, N.C. and I went to pass a driver, accelerating from approximately 40 mph to 55 mph and the engine bogged and lost all power. I continued to hit the gas for about another second and the wheels then locked up and the truck had several violent jerking motions before coming to a complete stop. The engine would not turn back on for an hour. I had it towed to the Ford dealership (under warranty) and they reset the computer. The truck seemed to run ok in the time since then, with the exception of the occasional shuddering during hard acceleration. Now (December 2013) the truck will not accelerate at higher than 2,000 RPM when in 4th, 5th or 6th gear without shuddering and cutting power to the engine. The check engine light begins to flash during this and then turns off. Ford is not willing to cover the repair costs and despite speaking to several customer service representatives, no one at Ford has acknowledged this issue happening with any other vehicles.

- Asbury Park, NJ, USA

problem #141

Dec 162013

F-150 6-cyl

  • 64,300 miles
2011 Ford F150 equipped with 3.5L turbo charged engine traveling at 65 mph began misfiring and suddenly experienced a near total loss of power, causing the vehicle to slow to 25 mph quickly. The vehicle was traveling on a two lane highway with no shoulder and no place to pull off the road. This incident did not pose an immediate threat to car or driver, but under other conditions such as overtaking (passing) slower traffic, the sudden and near total loss of power could be disastrous. After quick research and consultation with the Ford service center where I purchased the truck, I have learned the vehicle entered into "limp" mode to protect itself from mechanical damage. I have also found that this problem has long been acknowledged by Ford Motor Company and has been the subject of a few technical service bulletins. Also to the best of my knowledge, Ford, through this series of technical service bulletin's has failed to provide a permanent solution to this problem. I am filing this complaint in hopes that the NHTSA in cooperation with Ford Motor Company can provide a quick and permanent solution to this problem before someone is seriously injured or worse due to an engineering flaw on a motor vehicle.

- Barnsdall, OK, USA

problem #140

Jan 152012

F-150 6-cyl

  • 3,326 miles
Upon trying to pass a truck, when I stepped on the gas for added power, the engine convulsed and shook the entire truck, lost power, engine light flickered... I pulled over immediately, called the Ford dealership, they did a check through on star (type system). Said they saw nothing?! started back up, seemed to be fine once again. This has happened now multiple times. Always when stepping on the gas for added power, same scenario. This is the eco boost engine. While I love the power, it has failed me 5 times to date. Same problem as the PE 13-018 report.

- Apo, AE, USA

problem #139

Dec 112013

F-150 6-cyl

  • 67,000 miles
I was driving 70 mph up a hill when my truck started hesitating and my speed started to rapidly drop. I was in the fast lane and was forced to make my way to the right shoulder under a major power loss. The problem has since happened multiple time when I accelerate rapidly or under a load.

- San Bernardino , CA, USA

problem #138

Feb 012012


  • 3,500 miles
The contact owns a 2011 Ford F-150. The contact stated that while driving at approximately 55 mph, the accelerator failed to respond to acceleration attempts. Additionally, an error code (P0036) and the check engine warning light illuminated. The contact also mentioned that the vehicle failed to operate normally when driving in rainy weather. The vehicle was taken to a dealer but was not able to be diagnosed. The technician was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was notified. The failure mileage was 3,500.

- Kinmundy, IL, USA

problem #137

Aug 022010

F-150 6-cyl

  • 25,000 miles
Sometimes when I try to pass the engine during full acceleration stumbles and looses acceleration. It does not happen all the time and does not give an error code in the computer. Very dangerous on two lane road passing.

- Sugar Land, TX, USA

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