2015 Ford F-150: misfire or rough idle

Filed Aug 4, 2026 · Electrical, Engine · NY

The timing belt/chain is failing on F-150 trucks and multiple people have sent in issues. i think from 2015-2018. It looks like you are already looking at other Fords with same issue. what i was told is that there could be sudden stalling: If the timing is thrown off or the chain snaps, the engine cuts out instantly. Losing power steering and engine power while driving in traffic creates an immediate crash hazard. Severe Misfires and Power Loss: A slipping chain causes rough idling, violent shaking, and an inability to accelerate which happened to the truck. Due to this i had to get mine fixed in June of 2024 i have attached the invoices. I tried to upload invoice but said there was an error

Filed Mar 1, 2026 · Engine · FL

The vehicle’s original engine began producing excessive white smoke during startup. The vehicle was diagnosed by AutoNation Ford, and it was determined that the passenger-side cylinder head was cracked near the exhaust port. This defect allowed coolant to intrude into the passenger-side turbocharger. Due to the extent of the damage, the engine required full replacement. The engine was replaced with a used motor under a third-party warranty on August 21, 2024. The replacement engine is now experiencing the exact same failure symptoms. Specifically, the vehicle produces white smoke at startup consistent with coolant intrusion. Bozard Ford performed a diagnostic evaluation, completed on February 27, 2026. Their findings determined that the replacement engine has the identical defect: a cracked passenger-side cylinder head near the exhaust port allowing coolant intrusion into the turbocharger. This repeated failure raises significant safety concerns. Coolant intrusion into the turbocharger and combustion chamber may lead to engine misfire, loss of power, potential engine damage while driving, and possible sudden engine failure. Additionally, burning coolant may damage emissions components and create hazardous driving conditions due to reduced visibility from exhaust smoke. The fact that two separate engines in the same vehicle have experienced the exact same cylinder head failure suggests a potential design or manufacturing defect specific to the 2.7L EcoBoost engine. I respectfully request that the federal safety agency investigate this issue to determine whether this is a broader safety-related defect affecting other 2015 Ford F-150 vehicles equipped with the 2.7L EcoBoost engine. Please let me know if additional documentation, repair records, or diagnostic reports are required.

Filed Jul 8, 2025 · Electrical, Engine · FL

The engine while operating at normal speed loses power to a rough idle and is remedied by putting the vehicle in park and restarting the engine. The engine never fails to start after restarting, but could fail at any moment, short or long term.

Filed May 2, 2025 · Engine, Transmission · 153,000 miles · NC

The contact owns a 2015 Ford F-150. The contact stated that while driving at undisclosed speeds, there was a misfire coming from the engine. The contact stated that the ignition coils had melted and were replaced four times. The check engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the PCM needed to be replaced. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 153,000.

Filed Sep 11, 2024 · Engine · 107,000 miles · LA

The contact owns a 2015 Ford F-150. The contact stated that while attempting to accelerate, the vehicle jerked abnormally before accelerating. The failure had become more persistent eventually causing the vehicle to stall. The vehicle was towed to the dealer where it was diagnosed that the cam phasers had failed, there was an engine misfire, and the timing chain and tensioners had failed. The vehicle had been repaired. The contact stated that approximately 14,000 miles after having the vehicle repaired, the failure reoccurred. The vehicle was returned to the dealer where it was confirmed that the engine had failed and needed to be replaced. The dealer informed the contact that the vehicle was not covered under warranty. The vehicle was not repaired. The contact became aware of Customer Satisfaction Program: 2N103 (Engine and Engine Cooling). The dealer confirmed that the vehicle was not covered under the CSP. The manufacturer was made aware of the failure and confirmed that the vehicle was not covered under the CSP. The manufacturer referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was 107,000.

Filed Sep 15, 2022 · Acceleration, Electrical · IN

While driving at posted speeds on open highway and in congested work zones, this F-150 experienced an Electronic Throttle Body failure 5 times between Rochester Hills, MI and Granger, IN on 9/13/2022. It happened again on 9/14/2022 in city two way traffic with no shoulder. In each incident, the vehicle went into limp mode with rough idle and had to be completely stopped, turned off and restarted in high traffic, hazardous stopping locations. This happened once before in the mountains in Utah, in a construction zone back on 5/02/2021. At that time, the check engine light did not stay on and Ford was unable to find a code. It did not happen again until 9/13/2022. These incidents put me and my family in danger with each episode. Ford is fully aware of this issue, has in the past and should notify owners of the potential issue and continue to make repairs available as a recall or extended warranty service issue.

Filed Jun 23, 2022 · Engine · 111,000 miles · IA

The contact owns a 2015 Ford F-150. The contact stated while driving 35 MPH, the check engine warning light and service engine warning light illuminated. Additionally, the "Uphill Assist Not Available" and "Advance Service Tract Not Available" messages were displayed. The contact stated that the vehicle idled and was running rough while depressing the accelerator pedal. The contact turned off and restarted the vehicle. The vehicle continued to run rough for 5 minutes and the contact continued driving; however, the failure reoccurred twice within 15 minutes on that same day. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 111,000.

Filed Jun 26, 2021 · Steering, Transmission · KS

When driving on the highway an alert popped up on the dash stating Hill Descent Control Fault which was followed quickly by Service Advancetrac and a yellow wrench and see manual. These warning continued to cycle and the truck seemed to lose ability to maintain speed as is slowed down and the steering became difficult. I was able to get it off the highway without incident as there were not many vehicles on the road, but if it would have been busy, I would have been in trouble. Once on the shoulder I placed it in park and the truck began to shudder and run rough. I turned the truck off and let it sit for a few minutes and then restarted it. Upon restart everything appeared normal and there were no warnings, I was able to continue to my destination. I called the dealership and they sounded like they had heard this story before and told me I could bring it in within a weeks time. I was also told that it would not cause any damage to continue to drive it. While waiting for the repair I did have to continue to drive it and this same thing would happen randomly just going down the road and all of the sudden you get a warning lose the ability to maintain speed and steering becomes difficult. Being on the highway in this situation is dangerous since you never know when it might occur. After going to the dealership they listed the repairs on my form as: installed BL3Z9E926 B Throttle Body and Motor Asy installed BL3Z 12029 C Coil Asy - Ignition installed BL3Z 12A402 A Boot - Ignition wire prot (5 items) installed CYFS 12 YT4 Spark Plug (6 items) The parts and labor of this repair came to $972.56. I have read forums online that that state others have had this repair done as well and some people say their steering rack was replaced as well. This repair was just done yesterday (6-26-21) and I am hopeful that it will fix the problem. I feel that based on the reading I have done this has happened to lots of people and is dangerous, so I wanted to report my incident.

Filed May 13, 2021 · Transmission · 68,881 miles · IN

Vehicle lost all speed control when taking off from a stop and engine was shuttering/vibrating/misfiring and dash panel lit up like a christmas tree with all kinds of warnings. Pulled over to the side of the road shut down and let sit for several minutes. Restarted and engine light stayed illuminated. Truck was running ok and limiter was not engaged was a short distance from home so I began to drive. Made it up to 55 MPH and about 1/2 a mile and without any warning it began to act up again so to prevent an accident I pulled over and called a tow truck to have it towed to dealership. They diagnosed to to be a faulty throttle body. $502.46, a heart and panic attack later it seems to have fixed the problem.

Filed Aug 28, 2020 · Engine, Fuel system · 73,344 miles · NM

Truck engine goes to rough idle while driving, have to shut engine off, restart. Never know when this might happen or at what speed. Local ford dealer unable to find problem.has happened several times

Filed Jan 27, 2020 · Engine · 150,000 miles · GA

The engine has repeatedly had cylinder misfires over the past 100,00 miles and 2 years. It's happened many times with different cylinders. Replacing the coilpack resolves the issue but it returns after a few weeks. This appears to be the moisture problem with the turbo intercooler that already has several reports. This occurs when the vehicle is in motion and usually while accelerating. It happens most often during wet conditions. When this happens, there is a loss of power and the vehicle slows considerably. This is very dangerous in heavy traffic or when pulling into traffic.

Filed Sep 30, 2019 · Driver assistance · 60,200 miles · IL

Service advance trac light came on while driving at highway speeds. Complete loss of power but engine was still running at a very rough idle. Zero throttle response. This happened while pulling a 30 ft camper in downtown nashville. Extremely dangerous situation. I was able to shut the truck off and restart it to clear the code but it continued to happen. After researching online I've found that this is a very common problem caused by the throttle body and sensor. Theres recalls out for multiple f150 truck models but apparently mine was made at a time that wasn't included in the recall. Ford has a bigger problem than they are admitting to and they are putting people's lives in danger by doing so. I reached out to ford because I wanted them to document that theres a problem if they weren't going to fix it. They recommended I report it to the federal safety agency. I nearly got hit multiple times because of a faulty sensor that costs less than $300 to replace.