general problems of the 2015 Ford F-150 - part 1

Vehicle unexpectedly down shifting while driving causing vechile to jerk. After parking truck, truck presents a no start condition and unlit gear selector lights. While driving truck will go in and out of limp mode. I have scheduled a appointment to bring the truck in for a diagnostic test 03/31/2026.

While driving on the highway at approximately 70 mph, the vehicle unexpectedly downshifted without any prior warning or indication of an issue. This sudden loss of speed created a hazardous situation, as the vehicle travelling behind me was forced to swerve quickly to avoid a rear-end collision. Immediately following this, the check engine light illuminated. From that point forward, the transmission would not shift below 3rd gear for the remainder of my commute. This significantly impacted the drivability of the vehicle and made continued driving concerning, particularly in traffic conditions. After arriving at my work, I retrieved the diagnostic trouble code, which was identified as p0721 (output shaft speed sensor). Notably, there were no prior warning signs, drivability issues, or alerts indicating a potentail failure before this incident occurred. Given the sudden and unpredictable nature of this event, especially at highway speeds, I am concerned about the safety implications of this issue. A failure of this kind, without warning, creates a substantial risk not only to the driver but also to surrounding traffic.

Driving at highway speeds, transmission shifts into 2nd gear. There is no transmission selection on dash. Shut truck off, now won't start. Truck finally started toke to my local shop and had it repaired.

Auto transmission makes loud noise. Will not shift gear. Engine warning light comes on. After waiting a few minutes, I restart the engine and it may shift gears properly.

While driving at highway speed (60mph), the truck suddenly downshifted to 1st gear causing the rear wheels to lock up until the vehicle slowed to roughly 45mph. At the time of the incident, the truck was not loaded, not towing and weather conditions were cool and dry. Since that incident, the truck hunts for gears, shifts erratically and harshly and will occasionally get stuck in a random gear.

The contact owns a 2015 Ford F-150. The contact stated that the vehicle was chugging while driving. While driving 60 mph the following day, the vehicle made abnormal whining sounds and lost motive power while depressing the accelerator pedal. The check engine warning light was illuminated. The contact was able to pull over to the side of the road. The contact resumed driving, but the vehicle failed to exceed 30 mph. The vehicle was taken to auto zone, where it was diagnosed with a transmission sensor failure. The dealer was contacted and informed that the VIN was not under recall. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 94,000.

The transmission range sensor has failed on my f150. This made my truck go into limp mode and unable to start. The Ford dealership replaced the lead frame and trs as it was burnt out. The new trs then began to automatically downshift while I was driving on the highway. It went from 6 gear to 4th back to 6th and then briefly to 1st making my truck lose power before going back to 6th gear while I was driving at 70 mph. There were no warning lights, a service light had come on just before the incident. The safety issue is a sharp and sudden downshift while driving at high speeds this can cause severe accidents. I understand that the transmission range sensor for my Ford F-150 is under investigation by the nhsta and in the engineering analysis stage before a recalled is determined. The dealership is looking at the problem as I’ve already spent over $2100 fixing it.

As I was slowing down the truck started to flash the 123456 indicator for the gear. The truck then slipped out of gear and even though I was in drive the truck wouldn’t move. Like I was in neutral. Then with a big bang it started to move again. I stopped and shut the truck off. Started back up and continued to drive to get home. I stopped for a red light and accelerated away from the light and got stuck in the middle of the intersection. I had to shut the truck off in the middle of a state highway then start it again to be able to drive away. It turned out to be a transmission issue from something called the “ lead frame connector. ” the dealer says it happens to all of them. It was very sudden and very dangerous.

Hard clunk from first to second shift. The wrench light comes on, telling you to check the manual. Vehicle stays in 3rd gear. Will not shift into 6th gear. Will not downshift into 2nd or 1st gear. Stays in 3rd gear at a dead stop. The problem was independently reproduced.

The contact owns a 2015 Ford F-150. The contact stated that while driving at 30 mph, the transmission unexpectedly downshifted to first gear. The contact stated that occasionally the transmission unexpectedly upshifted to 3rd gear and seized. The contact stated that the failure was intermittent but became a recurring failure. The contact stated that the wrench symbol was intermittently illuminated. The contact had taken the vehicle to an independent mechanic, who diagnosed the vehicle and determined that the molded leadframe on the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 131,000.

The contact owns a 2015 Ford F-150. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The powertrain symbol was displayed, with a message to check the owner’s manual. In addition, the contact stated that the failure had occurred while driving from a stoplight. The transmission remained in third gear. The vehicle was turned off, and the powertrain was reset. The failure was a persistent failure. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 109,320.

Very harsh downshifts at random speeds. Transmission slips very hard when cold and overall slips or down/up shifts hard randomly and fairly often.

The contact owns a 2015 Ford F-150. The contact stated while driving 70 mph on the highway, the gear transmission independently shifted from sixth gear to seventh gear. The vehicle was turned off and restarted and the vehicle operated as intended. Neither an independent mechanic nor a dealer was contacted. The vehicle was not taken to be diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 211,256.

Was driving my truck to work and all of a sudden it down shifted from gear 6 to gear 4. Then through up the wrench icon on dash. Would not come out of 4th gear. Code was p0720. Output shaft speed sensor. Once code was cleared, it was ok again for about 20 miles then did it again.

Truck is shifting into low gear while at highway speed cause load thump or bang.

Rough shift in 4th gear . . Transmission bangs going in and out of 4 th gear . . There's been news reports your investigating this issue and that it could possibly cause the transmission to lock up at highway speeds.

Transmission slipping and bangs into and out of gears downshifts without doing anything when transmission services there was lots of metal fragments on the magnet2 no change and after having transmission reprogrammed no change.

Truck goes into first gear shifts automatically at any speed.

My vehicle, a 2015 Ford f150. Xlt 3. 5 ecoboost 4x4 supercrew has been downshifting intermittently while under load. This has almost caused me to wreck my truck as it has gone from 5th gear at 65 mph to suddenly 1st gear causing the rear drive axle to lock up momentarily on the freeway. This has also happened while accelerating onto the freeway where it will go from 3rd or 4th gear under hard acceleration to suddenly slam back into 1st gear. After this happens it will almost always go back to 3rd gear and will not shift up or down. The only solution I’ve found is to pull over, turn the truck off, remove the key and restart the truck. It will then drive normal for some time until it happens again. I was told by Ford that” OH yeah, it’s your transmission lead frame/ output speed sensor”. If Ford knows about this safety issue, why are they not fixing it on their dime. This is obviously a known issue, but I guess some people will have to lose their lives before Ford will fix this.

The transmission will sporadically shift hard and make a squeal noise on acceleration and deceleration between 20 and 50 mph. Yes it's available for inspection. It has never stopped completely so the risk factor is unknown. Not reported to dealer or independent mechanic at this time nor has it been inspected by the manufacturer or government agency. There are no warning lights dash messages ever displayed.

Transmission downshifting at highway speed, started to stall, went to limp mode had to manual shift to get to exit.

The contact owns a 2015 Ford F-150. The contact stated that while driving in fourth or fifth gear, the transmission unexpectedly downshifted to first gear. The contact shifted the transmission into neutral(n) and came to a stop at the traffic light before starting to drive. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The contact related the failure to NHTSA action number: ea26001 (power train). The manufacturer was not made aware of the failure. The failure mileage was approximately 62,000.

Truck began reviving at high idle after throwing a check engine light, then wrench light as I was driving. I was able to safely get off the road. Shut it down wouldn't restart. I let it sit for 4 hrs, it started then I began driving again as there was no indication of an issue before. At 50mph it happened again. Truck began reviving at recline, check engine and wrench light. Shut it down again, and this process of restarting again hours later as nothing was wrong is still going on, 3 yrs of it. Check engine codes that do come up when it begins again all point to speed sensor and leadframe. Someone said check cam sensors but have no check engine on them at all, only leadframe issues that abruptly occur out the blue. When it happens I can driving at any speed and first thing that happens is the throttle revs to redline and truck begins shifting abnormal, check engine, wrench, shutdown(thankfully), then hours again now indication of an issue! when I get the truck shut off and off the road, which I had it towed 7 times, show p705,706,707 codes all pertaining to leadframe. Please for the sake NY family and many others recall the 2015-2017 f150s for this $2000 electrical sensor replacement that is putting lives in jeopardy.

I was driving down the road at 45mph and the vehicle suddenly shifted into 1st gear and rapidly slowed down. A malfunction indicator came on, I shut the vehicle off thinking it was a glitch, then the vehicle wouldn't restart. This occured in midday traffic, which could've caused a crash. Never had any previous issues with the vehicle. It cost me $1854 to have this repaired at the Ford dealer, they stated the lead frame connector had failed.

Was driving at 50mph on hiway, all the sudden truck has loss of power and engine shut off, coasted down to stop, put truck in par, stared the car and drove another 5 miles and same thing happened again. No warning lite, no error messages was present when shut off happened nor during obs scan at later time was. When second shut off happened there was a shift down happened. Not sure if the transmission speed sensor has something to do with engine shut off.

My truck started going into neutral while going in reverse, would rev up going forward and go into neutral or limp mode.

Transmission unexpectedly downshifts to first gear then goes to neutral automatically. Requires driver to pull over and shut engine off for 5 minutes then restart and continue normal operation. In addition to this issue the 3-4 shift lags then slams into gear.

My truck abruptly downshifts to a lower gear, first or second, without any warning on the freeway. Seems like wheels lock up momentarily. There is nothing that notifies me before this happens. Very random occurrence but also very dangerous.

While driving at normal speeds, the transmission hesitates and pops when shifting into 4th gear. The vehicle slows down unexpectedly before shifting and will suddenly downshift without warning. This causes abrupt deceleration and creates a safety concern, especially at highway speeds. The issue occurs intermittently and without driver input. Even when I’m in normal gears it will downshift and cause me to slow and lose control even when I am not breaking. It occurs at just 35 mph- highway speeds.

Hard down shift while driving locking up rear wheels almost cause an accident has happen 3 times now no trouble code can’t figure out what causing engine to down shift extremely hard have not driven truck long distances because of incidents lucky all three times it has happend no one was behind me the most recent time on 1/3/26. I ended up in the ditch with no damages to truck.

Uncommanded downshift at highway speed causing sudden deceleration / loss of vehicle stability. Has happened twice, once in 2020 and again in 2025. Typically in slower than highway speeds when traffic is moderate to high and traffic starts to clear. Accelerator is pressed to return to highway speeds and the vehicle downshifts suddenly. Nearly caused collision from the rear vehicles both times.

The transmission unexpectedly downshifted while merging onto another ramp onto interstate with people behind me it was in 4th then it downshifted to 1 thankfully nothing bad happened during that time. But there has also been times when merging onto the freeway way where it would do the same when about to merge on as well it’s happened a few different times.

Sudden downshift and locking in lower gear, not shifting especially in tow haul mode but somtimes just driving in standard mode.

1. System failed: power train (transmission). Component failed: the 6r80 6-speed automatic transmission, specifically the internal lead frame and the direct drum. Inspection: no, the failed unit was replaced on December 19, 2025, but itemized diagnostic reports and repair invoices from both a Ford dealer and an independent shop are available for inspection. 2. The vehicle experienced sudden, unexpected downshifting and a temporary loss of power while in motion. These incidents occurred frequently and randomly, particularly while accelerating or traversing inclines, creating "unsafe driving scenarios" where the vehicle could have been rear-ended or lost traction due to abrupt gear changes. Furthermore, the vehicle eventually entered "limp mode," where it would "buck" during shifts and fail to accelerate under load, leaving the driver vulnerable in traffic. 3. Yes, by both. Independent center: super tech automotive confirmed on December 11, 2025, that the transmission line pressure dropped from 158 psi to 20 psi under load, causing the vehicle to go into "limp mode". Dealer: south west Ford service department verified the concerns on December 16, 2025, documenting a "torque converter shudder" and "direct drum failure" with "excessive metal debris in fluid". 4. Yes. The vehicle was inspected by a manufacturer-authorized dealer, south west Ford service department, on December 16, 2025 (service advisor ryan forbis; transmission specialist 'dietrich'). 5. Yes. Symptoms: the symptoms first appeared in August 2025 as a "sudden, temporary loss of power or unexpected down-shifting". Warning lamps: initially, no warning lights or error codes were produced, which prevented early detection during multiple diagnostic attempts. Later symptoms: on December 11, 2025, the ses (service engine soon) light finally appeared when the truck entered "limp mode". Prior to the total failure, the transmission also exhibited "harsh/jerky downshifts" and would "hang up in gear".

While in 6th gear driving on the highway at 70 mph the truck downshifted to 3rd and drastically decelerated. When this happened the instrument display went from having all 6 gear numbers viable to only 1 - 3. It had to be put into manual mode and shifted into 6th manually. This happens twice in the same trip.