2015 Ford F-150

The contact owns a 2015 Ford F-150. The contact stated that while driving 30 MPH and attempting to activate the right turn signal, the indicator failed to operate as intended. Upon inspecting the vehicle, the contact became aware of water inside the taillight assembly. The vehicle was taken to a dealer, where it was determined that the taillight assembly needed to be replaced due to condensation. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 30,000.

While driving at night a random engine light came on as well as the wrench light came on. Truck downshift and gets stuck at 3rd gear

While driving 75mph with cruise control set the transmission downshifted to 3rd gear. I put it in manual to shift the gear back up to 6th gear. This is the 3rd time it has happened in 6 months the first and second time was while driving in Mississippi on I-10 East and Westbound in the same trip. The last time was Sunday April 5th 2026 at approximately 1145 AM CST while traveling on I65 South in Alabama. No lights came on the dashboard when it happened.

I was driving and came to a stop at a light, let off the brake and then my truck came up with a wrench light and wouldn’t read the transmission gear, cab tool pulled these codes u0402, p0706, p0707, p1702, p1921 all pointing at towards the 6R80 transmission for this lead frame/sensor failure. It will work after the truck sits off for a little while but once you start driving for a few miles it goes back into limp mode. I’ve seen you are looking into this as a recall an would love to see others get help with this issue before it’s to late like me now unfortunately

Transmission downshifts on its own while driving from sixth gear to fifth and won't go back into sixth or lower than 3rd when at a complete stop.

Hard Shifting, will enter limp mode in 2nd and 4th gear (usually will down shift to that gear). The check engine light will flash and I have to pull over, stop, shut off my vehicle and then restart it to resolve. I have already spent roughly $4,000 in repairs and still have continued issues. These issues started at approximately 100,000 miles, transmission was rebuilt at 110,000. The current mileage is 139,400.

Transmission will down shift randomly or not even engage when trying to accelerate. It shudders or harshly shifts.

"My 2015 Ford F-150 is experiencing an intermittent, complete loss of the Output Shaft Speed (OSS) signal within the 6R80 transmission lead frame. While driving at speed, the speedometer suddenly drops to zero, the 'wrench' light illuminates, and the vehicle performs an unintended, harsh downshift into a lower gear (Limp Mode/3rd gear). This creates an immediate safety hazard of rear-wheel lockup or a sudden loss of acceleration in traffic. i took my vehicle to a local repair shop where they could not duplicate the fault. i then called my local ford dealer who informed me unless it would duplicate the fault or show a code they could not repair the vehicle due to it being against warranty policy.

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.

My electronic shift on the Fly four wheel system keep dropping in gear while I'm operating the vehicle and it's dragging my back tires this is happening without me operating it

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.

Random, sometime months between issues, transmission and vehicle goes into limp mode. Output speed shaft sensor failure codes. This is a problem with the lead frame connector failure in the transmission (6R80 six speed). This is a common problem and should be a recall.

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.

Wipers failed to operate normally while driving. Wiper started moving very slow then stopped moving even with wet windshield. Upon research the problem was a seized passenger side pivot in the wiper linkage that required replacement of the Wiper Linkage assembly. No warning or noticeable problems until this occurred and vehicle was difficult to operate in rainy conditions.

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 NHTSA 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.

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.