Engine And Engine Cooling Problems of Ford F-150 - part 1

Brought my 2020 Ford f150 2. 7l ecoboost in for mandatory emissions recall 24e12. Vehicle had zero dashboard lights or performance issues prior. Immediately upon completion of the pcm flash, the check engine light activated. When the truck was scanned I am now receiving a p0420 and p0430 catalytic converter efficiency codes. The dealership is now requiring $6000 for replacement of qty 2 catalytic converters caused by the recall parameters. This is a predatory compliance software update designed to shift manufacturing component failures onto the consumer after the 80k mile warranty window (truck has 105k). I have filed a complaint with Ford and asked for a p01 financial review for after-warranty assistance and have been told there is nothing Ford can or will do to assist and I must pay them $6000 if I want them to fix this. Because of this the vehicle is now not emissions compliant.

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2018 Ford F-150 limited with the 3. 5l ecoboost engine. At approximately 60,000 miles the engine began making a rattling noise from the front of the engine on cold start, lasting several seconds. Over the last three months the noise has become progressively worse and now occurs at every cold start and lasts longer. The check engine light is currently illuminated. The vehicle has not stalled or lost power. A Ford dealer (wynne Ford, hampton, va) diagnosed the condition on September 24, 2026 at 104,661 miles as cam phaser failure, requiring replacement of the variable camshaft timing (vct) units and associated timing components. This matches Ford's technical service bulletin 23-2143, which covers 2017-2020 F-150 vehicles with the 3. 5l ecoboost engine built on or before November 30, 2019. Ford previously issued customer satisfaction program 21b10 and warranty extension 21n03 for this same defect on March 2, 2021, but 21n03 expressly excluded the F-150 limited trim, and both programs have since expired. The dealer additionally reported that it has submitted multiple other cam phaser repairs on 2017-2020 3. 5l ecoboost vehicles for manufacturer assistance in the past two months, including vehicles newer and with lower mileage than mine, and that all were denied. The quoted repair is $5,414. 11 at my expense. I am filing this report because cam phaser failure in these engines can progress to timing chain damage and engine failure, and because Ford has documented this defect since at least 2021 without issuing a recall. I contacted Ford (case cxh-09424982) and was denied any financial assistance.

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The contact owns a 2012 Ford F-150. The contact stated that the transmission seized while driving 15 mph and making a left turn onto the highway in oncoming traffic, and the vehicle suddenly stopped. The wrench symbol was displayed. The instrument panel was blank. The contact stated that the transmission unexpectedly downshifted. The failure had occurred several times while driving at various speeds. The contact logged into the Ford account and became aware of customer satisfaction program: 19n01. The vehicle was towed to the dealer, but the dealer referred the contact to the manufacturer. The manufacturer was contacted and informed the contact that the program had expired and opened a case. The failure mileage was approximately 150,000.

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Driving down highway 6/34. Cruise set at 65 mph. The truck on its own shifted into 2nd gear and revving up the engine caused the vehicle to slow uncontrollably, which is very unsafe driving. The 2016 has a safety recall to prevent this from happening. I am writing this to report that my truck has had the recall done, and this still happened. I will park the truck until Ford can fix it. But they are trying to get out of fixing this safety issue with all these trucks. At 65 mph, I lost control of the truck, and thank goodness there were no other vehicles on the road around me.

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While driving on the [xxx], close to [xxx], throttle response was lost on the vehicle. Immediately put the hazards on, turned them off momentarily to indicate a turn off to the shoulder, traffic was right behind me, with some fast movers. “hill start assist not available” was displayed on the main panel and “trac off”/ traction control. Below approx 10 mph the vehicle started shaking violently and we came to a stop. Turned the vehicle off and started looking in the manual and online for associated issues. Was able to restart the vehicle with no annunciated issues and continued driving at a cautious speed. A few minutes later the same issue arose. Had to pull over and reset the vehicle. By this time we had committed to taking the vehicle to the Ford service center on the interstate and made it there after occurring 4-5 more times where we had to pull over during the worst time of day, avoiding traffic on the on/off ramps. We had to use heavy braking once as we were disabled and there was another disabled vehicle also pulled over and we had to stop before them with enough safety clearance. We made it to Ford. According to sb 16b32b, our truck qualifies for an expired recall based on the [xxx] plant and the production date. Ford produced p2112 code for throttle body issues. We paid for the repairs. Requesting a re-inquiry of sb 16b32b. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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Spray on liners of cylinder walls absorbing oil and allowing it to pass through.

My 2020 Ford F-150 (5. 0l v8) experienced a sudden loss of engine power and stalled completely while I was driving. In the days leading up to this, the check engine light had illuminated, and I later discovered the vehicle had consumed a severe amount of engine oil — the dipstick read below the "add" line. Critically, no low oil pressure warning light or audible chime alerted me to the oil loss before the stall occurred. After the initial stall, the engine continued to struggle to maintain idle and stalled repeatedly whenever rpm dropped to approximately 1,000, making the vehicle unsafe to drive. I had the vehicle towed to a Ford dealership for diagnosis. The dealership's estimate confirmed the need for a full engine (long block) replacement, at a cost of approximately $19,824. 56 (total estimate $21,491. 04). I am aware that Ford issued technical service bulletin 19-2365, which acknowledges that 2018-2020 F-150 trucks with the 5. 0l engine may experience excessive oil consumption exceeding one quart per 3,000 miles with no visible external leaks, attributed to oil being drawn into the engine during deceleration fuel shut-off events. I believe this defect directly caused my vehicle's stalling and oil starvation, and that the lack of any dashboard warning prior to the failure is a separate and significant safety concern, since a driver has no way to know the engine is being damaged or that a stall is imminent.

The valve cover on my 2019 Ford F-150 equipped with the 5. 0l v8 engine has failed and is leaking engine oil directly onto the exhaust. The vehicle was inspected by a professional technician, who confirmed that the valve cover itself is the source of the leak rather than simply the replaceable valve cover gasket. The technician also advised that the valve cover on the opposite side is showing signs that it may develop the same issue and recommended replacement of both valve covers. This creates a safety concern because engine oil is leaking directly onto hot exhaust components. I am concerned that continued oil leakage onto the exhaust could result in smoke or an underhood fire. At this time, I am not aware of an actual fire occurring. The failure and location of the oil leak were confirmed by a professional service technician. The vehicle/component has not, to my knowledge, been inspected by Ford specifically for this issue. I am not aware of any warning lamp or dashboard message that appeared before the leak was discovered. The affected valve covers are composite/plastic components. Replacement of the complete valve cover has been recommended because the technician determined that the cover itself, rather than only the gasket, is causing the leak. The failed component can be retained and made available for inspection upon request after replacement. I am submitting this complaint because failure of the valve cover is allowing engine oil to leak directly onto the vehicle's hot exhaust components, creating a potential fire hazard.

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I am reporting a potentially serious safety issue involving my 2015 Ford F-150 lariat 2. 7l ecoboost (129,610 miles at recall service; now approximately 130,155). On xxx, orchid isle Ford in [xxx] performed recalls 24e03 and 26s28 (service order xxx). Before this recall service, I had never experienced the engine-stalling problem described below. Since the recall work, my truck has unexpectedly shut off more than six times. While slowing for a traffic light, the rpm smoothly drops and the engine quietly shuts off. I do not have to be completely stopped. I must put the transmission in park and restart the truck, after which it generally operates normally. The truck also intermittently takes longer than normal to start. No check-engine light appears when it stalls. There was also a previous frightening incident on saddle [xxx] before the recall service. While transporting a truck full of girls to a volleyball game, the truck unexpectedly and rapidly downshifted. A wrench warning briefly appeared. We turned the truck off and restarted it, and the warning disappeared. Recall 26s28 is relevant because it addresses an intermittent transmission range sensor signal to the pcm that can cause unintended downshifting. I returned the truck to orchid isle Ford on xxx. They could not reproduce the stall during an 8-mile test drive and found no active codes. Their testing found fuel-pump pressure/injector readings, battery, and compression were normal. The vehicle continues to stall. The battery was recently replaced and the fuel pump was replaced xxx. I cannot establish that the recall programming caused the stalling, but the timing is concerning. I have also found reports from other 2. 7l ecoboost owners describing low idle/near-stalling after pcm updates, including reports associated with 24e03. I request that NHTSA investigate whether pcm programming, 24e03/26s28, transmission range sensor/pcm communication, or related powertrain issues could cause shut information redacted pursuant to the freedom of information act (foia), 5 u. S.

Engine failure due to oil consumption. Low compression on bank 2. Changed coil packs, spark plugs and bank 2 catalytic converter misfires stayed. Took to dealer for diagnostics and found low compression and recommended engine replacement. Now getting new truck because of expensive engine replacement causing me to roll the negative equity to my new truck.

Known issues with design and life expectancy of the exhaust manifolds and bolts thousands of owners are replacing manifolds due to warping and shearing of bolts when exhaust overheats. I’m currently getting quotes to replace due to failure on a gently used truck. Failure happened during a highway trip of a couple hundred miles under no additional load.

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On xxx, my [xxx] son was driving this 2017 Ford F-150 when the transmission suddenly downshifted while traveling on the road. The downshift was severe enough that the rear tires lost traction and the vehicle fishtailed, nearly resulting in an accident. The vehicle was taken to an authorized Ford dealer on 8/18/2026. We reported the sudden downshift, but the dealer was unable to duplicate the condition. The dealer performed Ford recall 26s28/NHTSA 26v-237 and campaign 19g01, and the vehicle was returned on xxx. On xxx, only two days after the recall repair, the engine unexpectedly shut off while the vehicle was being driven. It restarted afterward. On xxx, the engine again unexpectedly stalled while the vehicle was moving. When the engine stopped, power-steering assist was lost and the driver had to coast the vehicle safely to the side of the road. The engine restarted immediately. When attempting to drive away, the transmission appeared to be starting in approximately third gear rather than first gear. After the vehicle was moving, the transmission eventually began operating normally again. Ford customer relationship center was notified on xxx and formally documented these incidents. The vehicle is available for inspection. I am concerned because the original sudden downshift closely resembles the safety defect addressed by recall 26v-237/26s28, and serious intermittent stalling and abnormal transmission operation have continued after the recall remedy was performed. I am requesting that NHTSA document and evaluate these post-recall safety symptoms and whether the recall remedy adequately addresses the underlying defect. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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Can phasers failed. Ford will not accept any responsibility for a known dangerous issue. Ford refuses to help even though they knew about this issue. They did not issue a recall, instead offering a customer satisfaction program so they could Dodge responsibility for future repairs. This is a dangerous defect as it can cause an engine to seize up on the highway. I’m stuck with a repair bill in the thousands of dollars and Ford will not even assist with the cost.

The contact owns a 2016 Ford F-150. The contact stated that vehicle was taken to the local dealer for a recall repair associated with the pcm reprogramming. Upon retrieval, the vehicle went into limp mode while driving. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly downshifted to a lower gear, and the vehicle lost motive power. The dealer was contacted and provided the contact with an estimate for a diagnostic test. The contact spoke with a supervisor, but no additional assistance was provided.

While driving at speed, my vehicle experienced a severe safety hazard: the transmission jerked violently and the engine completely stalled on the road, causing an immediate loss of power. The dealership diagnosed the truck and stated that tree debris had plugged the cowl drains at the base of the windshield. Because the drains plugged, rainwater backed up and overflowed directly into the passenger cabin, soaking the body control module (bcm) and crashing the central computer network. A vehicle's central computer network should not be engineered in a way that normal outdoor tree debris can completely flood an interior cabin module and cause a dangerous drivetrain shutdown while driving.

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I moved my vehicle from driveway to park on the street so my husband could park in the driveway. I then turned my vehicle off and roughly 2 hours later, a lady came screaming "fire fire fire!" I went to see where she was talking about and my truck was smoking under the hood, I then called the fire department and they came to extinguish the fire. I was unaware of any recalls as I am the 3rd owner of this vehicle.

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While driving, my 2022 Ford F-150 equipped with the 2. 7l ecoboost experienced abnormal engine operation, a check-engine light, and reduced engine power. The unexpected reduction in available engine power created a safety concern because loss of acceleration or propulsion can be dangerous when merging, crossing traffic, passing, or traveling at highway speeds. The vehicle was inspected and diagnosed by an authorized Ford dealership. The pcm stored dtc p0332, knock/combustion vibration sensor “b” circuit low. The dealer performed Ford pinpoint test dg. Testing reportedly found no open circuit, short to ground, short to voltage, or intermittent circuit fault. The dealer determined that the knock-sensor assembly required replacement. The repair involves replacement of Ford knock-sensor assembly ft4z-12a699-e, which contains both knock sensors. Access to the assembly requires extensive disassembly of engine fuel and cooling-system components. Ford’s service procedure includes removal of both direct-injection fuel rails, draining the cooling system, removal of the coolant pump, and removal of the coolant outlet connector. I am concerned about the possibility of coolant leakage or contamination affecting the knock-sensor assembly because of its location in relation to cooling-system components. I do not currently know whether coolant contamination caused this particular failure. I request that NHTSA investigate whether coolant leakage or contamination in this area contributes to premature knock-sensor failures on 2. 7l ecoboost engines. I have also identified another 2022 Ford F-150 with the 2. 7l ecoboost that was diagnosed by a Ford dealership with a similar knock-sensor circuit-low fault, p0327 also quoted replacement of the same ft4z-12a699-e assembly. I request investigation knock-sensor failures on 2. 7l ecoboost F-150s, including Ford warranty/field data and whether coolant leakage or contamination contributes to failures capable of causing unexpected reduced engine powe.

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Not sure if I can file an issue for this, but I wanted to let you know that a Ford safety recall caused other issues after it was applied. In late July 2026, my son received a Ford safety recall notice (recall #26s28) for his 2017 f 150 requiring a pcm software update. I brought the truck to crown motors in redding on August 11th for the recall service. Before this appointment, the truck had no performance issues. Immediately after picking up the truck, a noticeable pinging sound occurred under acceleration. I returned the vehicle on August 12th, where crown motors confirmed the issue and advised spark plug replacement. This did not resolve the problem. I was also told that continued driving could damage the engine, so the truck remained at the dealership. Over the following days, crown motors worked with Ford engineering and repeatedly attempted software-related fixes. Crown staff informed me they believed the recall update caused the issue, and the first internal Ford team reportedly agreed. However, on August 25th, Ford’s second internal review determined the software update was not responsible and stated that all repair costs would fall on me—despite the clear timeline showing the problem began immediately after the recall service. Customer service provided no assistance and refused to escalate my concern. As a result, my truck is currently non-operational, crown motors does not have a fix, and Ford will not cover repairs triggered only after Ford’s own safety recall. I believe the spark knock issue is an additional safety issue caused by the pcm recall update that was I was told could cause engine failure.

In late July 2026, my son received a Ford safety recall notice (recall #26s28) for his 2017 f 150 requiring a pcm software update. I brought the truck to crown motors in redding on August 11th for the recall service. Before this appointment, the truck had no performance issues. Immediately after picking up the truck, a noticeable pinging sound occurred under acceleration. I returned the vehicle on August 12th, where crown motors confirmed the issue and advised spark plug replacement. This did not resolve the problem. I was also told that continued driving could damage the engine, so the truck remained at the dealership. Over the following days, crown motors worked with Ford engineering and repeatedly attempted software-related fixes. Crown staff informed me they believed the recall update caused the issue, and the first internal Ford team reportedly agreed. However, on August 25th, Ford’s second internal review determined the software update was not responsible and stated that all repair costs would fall on me—despite the clear timeline showing the problem began immediately after the recall service. Customer service provided no assistance and refused to escalate my concern. As a result, my truck is currently non-operational, crown motors does not have a fix, and Ford will not cover repairs triggered only after Ford’s own safety recall. According to NHTSA’s info, it seems Ford is obligated under motor vehicle safety act (49 u. S. C. § 30111 et seq. ) to repair the vehicle. I am requesting that Ford acknowledge responsibility for the recall related issue and cover the necessary repairs. I am deeply concerned at the lack of support and accountability shown throughout this process from Ford. I am resubmitting this info, not sure if my first attempt worked. I had an issue with my internet browser.

The 10-speed automatic transmission (10r80) shifts harshly and erratically, hangs in gear, and lost 2nd gear entirely, causing unpredictable acceleration and gear engagement in traffic. First reported to a Ford dealer on 6/8/2021 at 25,883 miles (dealer called it normal). Repairs: internal teardown at 32,920 miles (damaged clutch, input shaft, torque converter hub); valve body repair under TSB 24-2101 at 63,483 miles; cdf hub and friction plate failure diagnosed at 77,584 miles (TSB 25-2126 failure mode); loss of 2nd gear at 88,449 miles. Pre-repair scan 9/2026 shows p0732, p076f, p07f6 (incorrect gear ratio, gears 2, 7, 9). Transmission being rebuilt again 9/2026. The engine also suffered timing chain and crankshaft failures requiring a full engine replacement at 66,108 miles and another timing repair at 77,584 miles. Three catalytic converter failures. Nearly 200 days in Ford dealer service departments.

Direct failure of cam phasers and confirmation. This led to erratic engine runtime leading to transmission shifting learned behaviors based on the bogus engine information. This causes erratic hardshifting into drive and most importantly dropping gears on the highway resulting in unsafe driving conditions at random. This includes both random downshifts at highway speed and a similar situation when accelerating the wrong gear is engaged both causing unsafe conditions for the driver and those surrounding. Upon phaser replacement the engine then ran correctly and transmission was reset both kam tables and learned behavior to rectify the transmission safety challenges. This should at least be a TSB not just a mystery to owners and dealers alike.

My truck has routinely been very hard shifting in 3rd to 4th gear. Recently it downshifted from 8th to 4th without warning and made a loud clunking noise. It still runs, but the transmission seems to be getting worse.

Truck starting missing gears when pulling onto highway. Rpms jumped high and truck wouldnt shift. Thankfully we made it across before the oncoming traffic or we would have been hit. Finally got it to go but it was missing gears causing it to drive sluggish. No prior engine lights warning me. When the incident happed I got a notification of a power train malfunction/ reduced power.

The contact owns a 2017 Ford F-150. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with cam phaser failure. The contact was informed that the cam phaser needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the NHTSA hotline to report the failure. The failure mileage was approximately 106,000.

I own a 2018 Ford F-150 3. 5l ecoboost with approximately 93,000 miles. I am experiencing a repeated cold start cam phaser rattle. This is a known issue addressed by Ford in several tsbs, including 19-2365, yet no recall has been issued. It has been "repaired" once at approximately 40,000 miles only to have the same issue reoccur at which time I was told that rattling at startup is "normal" and "since it doesn't persist it is not an issue". No ic gasoline engine should rattle on startup, and I believe this defect poses long-term reliability concerns and will lead to engine damage and failure during operation. Ford should be held responsible for a widespread design flaw affecting thousands of vehicles. I urge the NHTSA to investigate this recurring issue and hold Ford accountable for consumer safety and financial impact.

My 2022 Ford F-150 has experienced intermittent delayed starting, uneven idle, and hesitation during acceleration. At times, the engine sounds and feels as though it may shut off. I began noticing these symptoms several months ago, and the most recent occurrence was approximately August 2026. I do not recall seeing any warning lamps or warning messages when these symptoms occurred. The vehicle has not yet been inspected or diagnosed by a Ford dealer or independent repair facility for these specific symptoms, and the cause has not been confirmed. The vehicle is available for inspection upon request. I am concerned because my vehicle is affected by Ford recall 25s75 / NHTSA recall 25v455 involving potential fuel pump failure and loss of fuel pressure, which may result in poor engine performance and engine stalling. I am concerned that the symptoms I am experiencing could create a safety risk if the engine loses power or shuts off while driving.

The contact owns a 2022 Ford F-150. The contact stated that while driving approximately 55-65 mph, the vehicle stalled. The check engine and battery warning lights were illuminated. The contact associated the failure with NHTSA campaign number: 25v455000 (fuel system, gasoline). The vehicle was towed to an independent mechanic, and the failure was associated with the recall and a diagnostic trouble code related to the ecm reprogramming for the fuel system. The vehicle was towed to the local Ford dealer, who diagnosed the vehicle with a fuel system failure. The vehicle was not diagnosed or repaired. The manufacturer was contacted and opened a case. The failure mileage was approximately 29,043.

Ford issued 4 codes for campaign #26s28 (pcm recall). Numerous owners are being denied warranty/safety repairs due to “other codes” appearing after computer update. Same limp mode, same sudden downshifting and will cost us (and many others) thousands in repairs because Ford put out faulty repairs. We will be paying 1800 for 2 codes not included but for a part that is integrated with the lead frame. Many others are documenting similar circumstances online. My 16 yr old child will be driving this vehicle. I have filed numerous complaints under my case number with Ford should their “cheapest fix” cause additional issues.

Ford recall 26s28 NHTSA recall - 26v237 dealership has run the update. 2 codes not listed by Ford (regarding the lead frame in which they have 4 listed), are not covered by Ford according to the mechanics. The valve body is part of the lead frame but not covered under recall?? they don’t want to replace the lead frame as required by this safety recall. They want to charge us to replace the valve body, within the lead frame. [xxx], [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Pcm not communicating with throttle body causes wrench light to come on and we loose control of the gas and slows the car abruptly.

I was practicing backing up while turning my new approximately 3,000 lb equipment trailer for safety & maneuvering skill purposes. There was no payload in my trailer that I was towing. While slowly maneuvering & turning my equipment trailer in reverse at 1–3 mph, our 2023 Ford F-150 XLT suffered a commanded, abrupt, unexpected sudden acceleration while in reverse, which was not via the gas pedal or my input. The trailer violently jackknifed, made a loud noise on impact to the truck resulting in damage to the truck bed’s right quarter panel at the rear, and a broken right tail light. It happened so fast I had to slam on the break hard, since the truck felt like it would keep backing into the jackknife position with powertrain seeming to struggle to overcome the break for a short instant. I believed at that instant that a mechanical or software or both malfunction caused this since this happened so fast and abruptly. Also to note, the parking break has often turned on or off automatically both during this incident and prior to, both while the vehicle was moving motionless. After looking at the damage, it first appeared to me to be less than a $1,000. 00 repair bill, since only a small portion of the right rear corner of the fender was dented and the tail light broke. On Monday and Tuesday however I was surprised to learn after getting estimates that the damage is around $4,000 or more, since the entire quarter panel needs to be replaced - aluminum quarter panels cannot be welded, and it’s is an 8 foot bed with a huge quarter panel and lots of painting required. I have learned Ford motor technical service bulletin’s TSB 24-2070 and TSB 24-2176, or possibly other TSB(s) could be the cause. No other vehicles were involved. I drove truck to bill brown Ford service department, livonia, mi 7/29 for a diagnosis. I’m referencing xxx report number xxx taken xxx on this situation, and [xxx]'s "reccomended service" write up # xxx. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 5.

*brake system failure, complete shut down of vehicle. *vehicle unable to start. *vehicle was taken directly to peoria Ford ( 9130 w bell rd, peoria, az 85382) via tow truck on xxx confirmed when dropped off of brake system failure and vehicle not functioning. *vehicle was inspected on xxx which we were originally told it was the battery. Although the vehicle was in for trailer software recall on xxx and during inspection at that time battery was in good health. Warnings until attempting to use the vehicle on xxx and received the brake system failure alert. Vehicle would also not lock. *after battery was replaced by peoria Ford I was then told the brake system would not release and would need actuator misalignment reset/replaced.

See all problems of the 2021 Ford F-150 🔎.

This vehicle has been into the Ford dealer multiple times for transmission slipping type issues. From before the 60,000 mile powertrain warranty ended and after. The dealer said the only thing needed was an update and reset. Today a different Ford dealer has informed me that during the transmission flush, there are tiny specks and slivers of metal. The engine issue in regard to cam phaser repair recall/customer service bulletin has been leaking due to issues with proper sealant. The rear camera goes out and screen turns white at times.

Vehicle suddenly seemed to shift while driving causing a loud sound, jerk and caused a loss of control suddenly.

I am reporting a safety-related defect involving the 10r80 automatic transmission in my 2022 Ford F-150 stx. While slowing to a stop during normal driving, the transmission unexpectedly performed an extremely harsh downshift. The truck jerked forward violently as it shifted into a lower gear, making it difficult to slow the vehicle in a smooth and predictable manner. This occurred without warning and created a dangerous situation while approaching an intersection. A vehicle should decelerate in a controlled and predictable way. Instead, the sudden downshift upset the vehicle’s behavior and reduced my confidence in its safe operation. If this happens in heavy traffic, on wet roads, or near pedestrians, it could easily contribute to a crash. This is not simply an issue of comfort or drivability. It is a safety concern because it affects the driver’s ability to safely control the vehicle. My truck is equipped with Ford’s 10r80 transmission, which has been the subject of thousands of owner complaints describing harsh downshifts, delayed engagement, slipping, gear hunting, and other dangerous shifting behavior. Publicly available technical information also discusses failures involving the cdf clutch cylinder and sleeve, which can cause hydraulic pressure loss and unpredictable transmission operation. Based on my experience and the large number of similar reports from other owners, I believe this issue deserves a thorough safety investigation. Nhtsa should review warranty claims, dealer repair records, transmission replacements, technical service information, and consumer complaints to determine whether this transmission contains a safety-related defect that warrants a recall or other corrective action. Owners should not have to wait until a harsh downshift causes a serious collision before this issue is addressed. I respectfully request that NHTSA investigate this defect and require an effective repair to protect drivers, passengers, and everyone sharing the road.