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 17 of 17)

« Read the previous 20 complaints

problem #16

Oct 132012

F-150 6-cyl

  • 15,100 miles


Driving 60 mph at night in the rain climbing up a moderate slope (1-2%), towing a 6800 lbs 35ft travel trailer, and suddenly the engine check light turns on and starts flashing, vibrations from what I assume was the engine, shook the entire truck and caused my vehicle speed to drop from 60 mph to approximately 40 mph in a few seconds. Turned on my hazard lights slowly pulled off to the shoulder, then in a few moment the light went off and engine everything was find. I was lucky there was no one behind me and the trailer didn't jack knife on the highway at night in the rain in traffic. This is a serious matter than needs attention and investigated and action taken against. I will be taking my truck into the dealership first thing Monday morning to find out what is going on. Take action before someone dies from this.

- Rochester Hills, MI, USA

problem #15

Oct 092012

F-150 6-cyl

  • 11,820 miles
Yesterday I went to pass a truck that made an illegal turn, and had to hit the gas hard to get out of the way, only did it for about 2 seconds, than when I let off the gas, the engine kept running at high speed for about another 3 seconds? and my foot was not on the pedal at that time.

- Leesburg, GA, USA

problem #14

Jun 092012

F-150 6-cyl

  • 15,000 miles
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

problem #13

Oct 062012

F-150 6-cyl

  • 1,000 miles


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

problem #12

Jul 072012


  • 10,000 miles
During the process of draining engine oil, was removing the oil filter and oil started to pour out under the truck. There is an oil filter drain catch basin that is installed to make all the oil being spilled come out where it can be captured. The catch basin is not installed in a manner that allows the oil to drain properly, instead, the back end is lower than the drain portion. Blogs seem to confirm this is a problem with many of these trucks.

- Chattanooga, TN, USA

problem #11

Jul 272011

F-150 6-cyl

  • 1,806 miles
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

problem #10

Feb 032012


  • 1,000 miles


This is a on going problem that Ford knows about and have no fix for, and it will end up killing someone and no one seems to care. It happens when your merging on to traffic the truck boggs down and loses all power many times I almost got killed had to pull off the road so I would not kill the family. The keep coming out with fixes but nothing works including the last one where they put a deflector plate on the intercooler. I can not believe Ford keeps putting out trucks when they know of this.

- Spring Hill, FL, USA

problem #9

Jun 082011

F-150 6-cyl

  • 800 miles
At roughly 800 miles I attempted to pass on a rainy afternoon and while applying enough load to pass the truck started to surge/misfire severely and the check engine light started to flash. Drove the truck about 2 miles in this derated condition until I reached my destination. Turned the ignition to off and then cycled the ignition back on and the check engine light went out and the unit ran correctly again. Took unit to the dealer and the diagnostic tool once plugged into the data port did not reveal any fault codes and no codes were stored. The dealer could not duplicate the issue and nothing was done to resolve the issue. This has happened very intermittently about 7 times total now always when trying to apply throttle in either humid or rainy weather conditions. Several software updates have been performed to the truck for some issue with the trans, but this intermittent misfire under light load still occurs. This happened most recently at roughly 23100 miles on the odometer while driving up an incline at roughly 65 mph and applying light load to try and climb the hill. Had to let off the throttle and try to apply the throttle again to accelerate. This continued for about 3 throttle application attempts than finally smoothed out without illuminating the cel this time. Im sure the issue will continue until Ford comes out with a real resolve and not band aid repairs.

- West Bloomfield, MI, USA

problem #8

Jul 062012

F-150 6-cyl

  • 4,575 miles
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

problem #7

Nov 152011


  • 700 miles
The ecoboost version that I own has an apparently "known" problem within Ford where condensation builds up because of the turbocharger intercooler to the point that when you need to accelerate heavily to avoid a problem, to pass someone, or simply to get on a busy street or freeway, the truck sucks all that water into the engine and it completely misfires similar to just running out of gas. When this happens it can easily cause and almost has caused an accident. This happened first at about 700 miles and has happened numerous times since especially in high humidity. I keep hearing about "some fix is being considered by Ford engineering" and that the problem is in the Ford oasis problem reporting system number [xxx] I believe but 7 months later I am still waiting for Ford to step up. This problem can and I expect will get people killed and that's just sad. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Bel Aire, KS, USA

problem #6

Jun 022012

F-150 6-cyl

  • 7,400 miles


2011 F-150 3.5L ecoboost loss of power when accelerating from 50-60 mph to pass a vehicle. Vehicle bogs down and I was nearly rear ended twice in one weekend. Many are having this problem, I have taken the truck in for service and Ford cannot find a fix. This is either a fueling issue or a condensation issue in the turbo system, this problem only occurs in high humidity or rainy weather and usually has a misfire feeling to it. Ford is not pushing the issue and there are going to be accidents before they do anything. Personally I would not like to be killed in my new truck. The engine light has came on and threw codes P0300, P0304, P0305, PO306, which are all misfires, but when the truck is shut off and turned back on no codes are stored. This needs to be fixed before someone gets hurt.

- St. Joseph, MI, USA

problem #5

Nov 012011

F-150 4WD 6-cyl

  • 8,000 miles
The truck has developed a rough idle that causes the truck to feel as if it is missing. Along with the idle the fuel economy has dropped 4-5 mpg. I have had the truck in 3 times and 2 different dealers to try to resolve the issue. While in service diagnosics the techs where able to get the truck to misfire twice but they felt that it was not enough to be signifcant. The first dealership suggested I trade the truck in on another because they did not have a fix. The second dealer stated that they contacted Ford and was told that their is a known issue but Ford does not have a fix for the issue and does not have a timeline for a adaquate fix. The issue has been apparent now for 6 months with no end in sight. I have been told that I will just have to deal with it.

- San Angelo, TX, USA

problem #4

Mar 222012


  • 12,000 miles
Drove 200 miles with cruise set at 73 mph towing an enclosed trailer, damp cool conditions. Pulled off freeway to fuel up. While accelerating on the on ramp to get back on the freeway, vehicle stumbled, lost all power to the wheels, truck would not accelerate. Removed foot from accelerator for a few seconds and pressed down again, this time the truck accelerated. Happened again 2 days later while driving through fog. Vehicle is a 2011 F-150 equipped with the ecoboost engine. Intercooler condensation is the suspected culprit.

- Albertville, MN, USA

problem #3

Sep 202011

F-150 4WD 6-cyl

  • 2,000 miles
Driving down a two lane road in the early evening, I was 3 or 4 cars back in a long line of over a dozen vehicles. We were all stuck behind one slow moving vehicle. A chance came up to pass and I pulled into the other lane. After stepping on the throttle the truck developed a misfire. It lost nearly all power and began decelerating. In the time since pulling out to pass, a semi truck had popped up over an upcoming hill. By this point, the vehicles previously behind me had moved forward and filled in my place in line. I began evaluating my options. I was now moving slower than the traffic in the right lane, but there weren't any openings to move back over. I examined the shoulder on the left side of the road looking for safe places to pull over. There were none in the immediate vicinity. After several very tense seconds, the vehicle suddenly regained power. I had just enough time to accelerate to an opening in the right lane and get back over. Likely cause: Condensation in the charge air cooler ingested into the engine upon a call for power. Since the first incident this has occurred several more times. Every single time has been after cruising for some period at less than half throttle, followed by a sudden acceleration in humid or rainy conditions. Ford claims to be aware of the problem and working on a fix. However after waiting for over 8 months since my first incident I'm starting to have my doubts. I have heard reports from numerous other people saying this exact same thing has happened to them. Some of those are over a year old and are still waiting on a fix from Ford. Being aware of this problem I try not to put myself into a situation that will require the sudden application of power. However I know no matter how well you plan, eventually you find yourself in a bad situation. I just hope when that occurs it isn't a humid or rainy day.

- Seneca, SC, USA

problem #2

Sep 102011

F-150 6-cyl

  • 9,500 miles
While entering a highway via an on-ramp doing about approximately 45 miles per hour I attempted hard acceleration to pick up speed and merge in to traffic that was doing approximately 65-70 miles per hour. When I depressed the throttle the vehicle did not accelerate, but it started to hesitate and shake. The check engine light came on and the vehicle would not go over 40 miles per hour. This almost caused an accident situation as I expected the vehicle to accelerate when it did not. I was then forced to pull over to the shoulder and shut the vehicle off. After restarting the vehicle the cel had cleared and the vehicle was operating normally. No code was stored in the PCM to indicate what the issue was. This happened several more times since the first incident. Once while towing a 4000lb boat/trailer which also almost caused a severe accident. Ford has found nothing wrong with the vehicle and concludes there is nothing they can do since no codes were stored. I will note that after receiving tsb 12-2-10 the vehicle will still exhibit the same symptoms described above, but now the check engine light does not come on. Vehicle will stall, go in to "limp mode" with no indication that anything is wrong. Only resolution is to turn the vehicle off and back on to clear the status. This creates dangerous situations when on a highway. Completely unacceptable.

- Concord, NC, USA

problem #1

Nov 012011

F-150 6-cyl

  • 100 miles
After 100 miles I noticed a vibration or miss while truck idles at stops. Since that time every person in the truck notices it at every stoplight or stop sign. I took truck in for service and they ran all computer test on vehicle and they informed me that there is nothing wrong that is just how vehicle runs. I ask the service rep how that can be and he advised me that there have been multiple complaints by other people and that there are no updates or recalls on it.if it gets worse to bring back and will see if they can do anything about it but at this time Ford is not looking into the situation. Also on a side note chrome tow hooks are rusting and there answer to that is to clean them with steel wool what a way to be treated after making a $40,000 dollar purchase. One very pissed Ford owner [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Glenshaw, PA, USA

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