Automatic Emergency Braking Problems of Honda Accord - part 1

The car hit the brakes automatically at 70mph when passing on the left. There was absolutely nothing in front of the car that should have triggered the cmbs.

See all problems of the 2017 Honda Accord 🔎.

I purchased a 2022 Honda Accord hybrid two years ago. On multiple occasions, I have been traveling at high speeds 70-75 mph when the orange brake signal appears across the screen, and the car abruptly slams on the brake with no other vehicles around me. It forcefully threw me forward. We have had Honda vehicle in for service many times, the dealership are never able to duplicate the problem because it happens sporadically. It is extremely dangerous, and I don't ever feel safe in the vehicle, and I don't feel comfortable using the adaptive cruise control. In the past we have always owned Honda's and never ever felt unsafe. This is a serious problem that needs to be addressed quickly.

See all problems of the 2022 Honda Accord 🔎.

I was going on the highway at around 65-70 mph and the road was clear. The Honda automatic emergency braking (aeb/collision mitigation braking system) activated and I couldn’t do anything, the brake was sudden and my speed decreased to almost 30mph. There were no cars behind me or it would have definitely been a fatal rear-end crash. The road was clear, there were no cars/object ahead of me on the road.

See all problems of the 2024 Honda Accord 🔎.

Subject: vehicle safety defect report – brake failure and collision mitigation system malfunction to the national highway traffic safety administration, I am filing a safety defect complaint regarding a Honda vehicle that experienced sudden brake failure and a suspected collision mitigation braking system (cmbs) malfunction, resulting in a crash on [date]. Incident summary: • brakes suddenly stopped responding • cmbs appeared to activate or interfere with braking • no obstacles or hazards present • loss of control and collision • vehicle purchased from karplus warehouse (salvage title) • dealer did not disclose braking or safety system issues this malfunction created a dangerous safety hazard. I request that NHTSA document this incident and evaluate whether similar complaints ---.

See all problems of the 2019 Honda Accord 🔎.

I have bought this car new in 2018, the issue that I’m having is that . . I’ll be driving on the highway or local my car will brake on its own without any hazards in front of it . It’s very dangerous it almost caused me an accident on the highway .

See all problems of the 2018 Honda Accord 🔎.

My automatic braking system randomly halted me to a stop in the middle of a clear road and almost caused the person behind me to crash into me even though they were back away from me a safe distance. This has happened several times now and it scares me a lot every time it happens. Makes me want to sell the car. I looked it up and saw that many other people online have had an issue with this feature. I also learned there’s no way for me to fully disable the feature which is frustrating. I can only turn it off manually each time I turn my car on. This feature is not safe and has put my life at risk way more times than it has been helpful.

See all problems of the 2023 Honda Accord 🔎.

As I was driving, the automatic braking system engaged and there was no other vehicle or object in front of or beside me. The car behind me could have rear ended me.

In Feb. 2026, I had a software recall service performed on my Honda Accord. Later that same day, a persistent error message appeared on my dash: software update not available see dealer. I contacted the dealer and they said sometimes that error message clears on its own and to wait and see. A few days later as I was leaving work, I turned my car on, put it in reverse and realized I had no propulsion or power steering. I put the car back in park and restarted it and drove it straight to the dealer where it sat for about three weeks as they tried to clear the error message. They were not able to reproduce the issue I reported with my car being on but without power. I picked up the car on 3/16/26. After leaving the dealership, it began sputtering and lurching. I could see on the powertrain display that the car was not communicating well between the engine and hybrid battery. I pulled into a parking lot and put the car in park and it began functioning normally. I called the dealer and they said to bring it back if that happened again. It has not. Tonight, I was pulling up to a red light when my car suddenly slammed on the brakes and displayed lane departure mitigation off. I attempted to restore that safety feature and realized my car had lost power. It did restore power and I was able to drive home, but I am terrified of my car since it engaged the braking system for no reason and disabled a safety feature plus losing power. During my car's time in the service department, it got a new can gateway module and telematics unit along with repeated attempts to make the software update glitch free to eliminate the persistent warning messages that had been displaying. Honda tech support was involved, and I have contacted Honda corporate with my concerns about the safety of my car but am waiting for a response. My perspective is the software recall update ruined my perfectly good car and I am worried I am going to lose power and get injured or worse.

I own a 2018 Honda Accord equipped with collision mitigation braking system (cmbs). The vehicle has experienced multiple instances of false collision warnings and phantom braking. The issue occasionally occurs when approaching overhead interstate signs. In most cases, the system flashes brake warnings briefly and then clears. However, on one occasion during rainy conditions a few years ago, the vehicle unexpectedly applied the brakes at highway speed with no obstacle present. The vehicle has undergone multiple camera calibrations (this may have also included the radar), but the problem persists. This creates a serious safety hazard, particularly at highway speeds where sudden braking could result in a rear-end collision. The issue appears to be related to false object detection by the adas system, potentially involving radar or sensor misinterpretation.

The vehicle suddenly braked on its own without any obstruction, causing a violent stop and injury. I took it to the nearest dealership to check for a recall. They said there wasn't a recall for this VIN, although online searches show this as a known defect for 2018-2020 Honda Accord collision mitigation system.

Driving on rt 42 at 1042pm on March 1st going 60mph my cars break light came on for me to break like there was something in front of me but there wasn’t.

See all problems of the 2020 Honda Accord 🔎.

Description of incident: 1. Component/system failure: the engine cooling system and head gasket failed. A certified shop has confirmed coolant intrusion and a failed leak-down test on cylinder 2. The vehicle is available for inspection upon request. 2. Safety risk: my safety and the safety of my family and other drivers were put at extreme risk. On March 1, 2026, the vehicle suffered a sudden loss of motive power while traveling at 70 mph on the freeway. The car dropped to 15 mph instantly, forcing me to maneuver across active lanes to a narrow shoulder with almost no space. I was nearly hit by high-speed traffic. This has occurred over 8 times since 2023. 3. Confirmation by service center: the problem has been reproduced and confirmed by an independent service center on site lube auto & tire. They utilized a borescope and leak-down test to verify the internal engine failure. 4. Inspections: the vehicle has been inspected by a certified independent technician. I am in the process of notifying the manufacturer (Honda) of these findings for their inspection and accountability. 5. Warning lamps & symptoms: prior to the total power loss, the vehicle displayed engine temperature warnings and "check engine" lights. These symptoms first appeared approximately 8 months after purchase in 2023 and have progressively worsened, leading to the current engine failure. 6. Additional notes: this failure is identical to issues cited in active class-action lawsuits regarding Honda's engine defects, affecting both standard and hybrid models. I am communicating via written report/email for documentation and accessibility purposes.

This Honda Accord sport se has had electrical problems from the day I received the vehicle. Every time I went for an oil change at bommarito Honda I mentioned it to them and they said “yeah the new Hondas do tend to hand a lot of those electrical problems” so with this the problems continued to get worse. Sometimes the buttons do not work, sometimes they do, sometimes the lights don’t work and sometimes they do and sometimes the safety features and break system automated itself. I have slammed my head on the steering wheel on multiple occasions. I believe this needs to be looked into because the malfunction of the car falsely reports danger and caused an accident. Yes every time it malfunctions it flashes briefly and so quickly on the screen .

See all problems of the 2021 Honda Accord 🔎.

The body control module has gone out on my 2021 Honda Accord. Yesterday, when it went out, it affected all adas features, in addition to key functionality of the car.

February 13th at 1256am my emergency break light flashed on my dashboard and beep for me to break but there was nothing in front of me. I was going 60mph on route 42. Roads were clear and there was no traffic.

The multifunction adas camera module failed due to "internal error" at only 9 years old. This means that critical safety systems such as automatic emergency braking/lane keep assist malfunctioned and could not assist with avoiding collisions. I took the car to the dealer and they confirmed the issue, and charged me $2000 to fix this critical safety system. I noticed that the new camera assembly has an updated part number, indicating that Honda might have been aware of this failure issue. I have also seen some forum posts online of others having this failure with their 2016-2017 Accords with Honda sensing. Therefore I believe this should warrant a recall. When the failure first occurred upon vehicle startup a few days before I had it repaired, all these systems were disabled and there were multiple warning lamps on the gauge cluster and screen. Prior to this sudden failure, everything had been working fine as intended up until the very day it failed.

On Thursday February 5th 2026 I was driving on route 42 at 1014pm going 60mph and my automatic break light came on and beeped as I was driving down the highway. There was nothing in front of me.

My car automatically braked almost causing the car behind me to rear end me for no reason.

I was driving on the freeway doing about 65 to 70 mph and all of a sudden on the dashboard a large orange brake light came on and the vehicle hit the brakes automatically almost causing an accident. I took it to the dealership and all they did was reset some computer board but said they couldn’t find anything wrong with it. If they couldn’t find anything wrong with the vehicle then why reset the computer board.

Collision warning randomly activates when driving while no vehicles or objects are around. This has been ongoing, but this last time emergency braking activated extremely hard and would had caused a collision if there was a vehicle following as vehicle almost came to a complete stop on a 75 mph highway.

Car initiated emergency auto break while traveling on the freeway at high speed (70 plus mph) in phoenix, az for no reasons. There were no objects or cars within 500 feet, however I was approaching an overpass. This occurred multiple times on the freeway and on local roads. Reported to Honda, no fix.

There are two locations in the town I live where I am driving under a bridge, and there is a dark shadow on the road from the bridge. My car’s accident mitigation braking system turns on at these locations and suddenly brakes the vehicle. This is not safe as people are traveling speed limit around me and I can cause an accident this way. About a month or two ago, the car behind me almost hit me at one of these locations when my vehicle’s automatic braking system turned on. It was made to prevent accident and brake if there is a vehicle, but because it is braking due to a dark shadow coming, it is not working properly and needs to be looked into. I called Honda and they want me to pay hundreds of dollars at my local Honda dealership for a diagnosis, I do not feel like I should be responsible for that fee as this is a safety feature that is not working as it should and instead making it less safe for me and drivers around me.

The camera failed on the car rendering all the safety features inoperable. The camera cost almost $2000 making it an expensive repair.

All the panel lights on the dashboard lit up. Honda says I need new injectors for about $2000. The car only has about 66,000 miles. They also say a need a new head unit, for the entertainment system. I have had three other Honda Accords before this, averaging over 200,000 miles. Never problems like this.

I've had 3 phantom breaking experiences. Most recently while driving on a straight wet road (one of the other experiences the road was also wet). I was travelling at approximately 30-33 mph and the system did an automatic hard break with a perfectly clear road ahead, no cars, people or animals in front of me or on either side. Thankfully, no one was behind me either. The other wet road auto break instance was when I was traveling between 22-26 mph on a road with a slight curve and vehicles were parked on the right side of the road. I was turning appropriately to take the slight turn and suddenly the breaks slammed on. There was no danger of me hitting anything. The third instance was when a vehicle was crossing a two lane road from left to right ahead of me. Two vehicles were ahead of me in the right lane traveling the same direction I was. My vehicle slammed on the brakes assessing that we would hit the vehicle crossing the lanes. There was absolutely no danger of that happening, I was multiple car lengths back. Should this happen when vehicles are traveling behind me, it could cause a very bad accident and it would appear that I would be liable for slamming on my breaks. I will begin trying to disable this safety feature whenever the roads are wet and make an appointment to have the dealer inspect the car. This has not been inspected or confirmed by anyone at this point. When this occurs, there is no warning - just slams the breaks and a "break" warning with alert tones appears in the dash. No other warning lights or malfunction lights are on in my dash display. The vehicle is available for inspection with advanced notice so that I can make arrangements.

Driving on the white horse pike in berlin new jersey at 1:39pm on January 21st and my break light warning light came on. There was nothing in front of me, I was doing 40mph. The roads were dry, there were no cars near me, and no traffic. It happened again on the same day January 21st, on the white horse pike in lindenwold new jersey. This one happened at 520pm, I was doing 45mph and my break warning light came on. The road was dry, there was no traffic on the road, and no cars or debris in the road either.

All dashboard lights are on & will not go away!.

Upwards of a dozen times my Honda Accord will suddenly brake as it believes I am about to have a collision whereas it is typically a shadow. This happens when going under bridges or overpasses, or depending on the glare from the sun. This has happened several times on the highway causing multiple near collisions at high speeds. This is extremely dangerous and requires an adjustment or recall. I have had this part stolen and replaced through a Honda approved repair shop yet the issue persists.

Vehicle: 2017 Honda Accord ex mileage at incident: approx 30,000 date of incident: Dec 10, 2025 description of problem: while my daughter was driving our 2017 Honda Accord ex, the collision mitigation braking system (cmbs) suddenly activated without warning. The car slammed on the brakes even though there was no obstacle in front of her. This caused the vehicle to skid, but fortunately there was no collision or injury. There were no diagnostic codes found when inspected by an independent auto shop. The shop advised us to temporarily disable the cmbs system. This appears to be part of the ongoing issue of phantom braking in Honda vehicles, which has been reported by many owners and is currently under NHTSA investigation. I am concerned about the safety risk, especially since my daughter drives this car regularly. Safety concern: unexpected braking at highway or city speeds could easily cause a rear-end collision or loss of control. I request that NHTSA investigate this incident and ensure Honda provides a permanent fix or recall.

Inadvertent automatic emergency braking collision mitigation braking system automatically activated even there is no obstruction while driving.

The contact owns a 2020 Honda Accord. The contact stated that while driving at an undisclosed speed, the brakes independently activated, and the transmission independently shifted into neutral. The contact stated that there were no other vehicles nearby. The brake warning light illuminated. The dealer was made aware of the failure. The contact was advised to clean off the sensors and see if the failure reoccurred. The contact stated that she did not want to see if the failure would recur. The contact was informed that the repair was not covered under the recall. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 59,660.

While driving the automatic brake system randomly starts flashing brake across the instrument panel and begins to brake the car. This does this while there are no other vehicles or any type of obstacles near the vehicle. It also, does it at random caution lights for the fire department on a 4 lane divided highway. There is no way to stop it from doing so. This happens frequently and leaves the driver with no control over the braking system.

On December 4 at 8:57pm I was driving on interstate 295 doing 60 miles an hour and my car’s warning light for breaking came up for me to break like something was in front of me even though there wasn’t, this is a continuing thing going on. I reported every time it happens.

While driving, my 2023 Honda Accord hybrid suddenly experienced a multi-system failure affecting: road departure mitigation system tire pressure monitoring system (tpms) vehicle stability assist (vsa) hill start assist electric power steering system brake system (“brake performance may be reduced”) all warnings appeared within seconds. The vehicle is available for inspection, and the incident is documented with multiple photographs. In addition to the system failures, the vehicle unexpectedly began to lose power while I was driving, causing it to slow down rapidly in active traffic. This created an extremely hazardous situation, including: risk of being rear-ended since my vehicle slowed without warning reduced steering assist reduced braking performance loss of stability control inability to accelerate out of the way this combination could easily have caused a serious collision. I later learned that there is an active recall related to the systems that failed on my vehicle. However: I never received any communication from Honda, no letter, no email, no notice of any kind. I am extremely unhappy and frustrated about this. Had Honda informed me of the recall: I would have scheduled service immediately I would not have driven the car under normal conditions I would not have been exposed to this dangerous situation on the road the absence of recall notification directly contributed to my being put in a potentially life-threatening situation. A recall notification exists for a reason which is to prevent exactly the type of failure and danger that I experienced. Honda’s failure to notify me removed my ability to take preventative action. The issue has not yet been diagnosed or confirmed by a Honda dealer. I will be taking the vehicle in for inspection as soon as possible. No inspections have been conducted yet, but I have full photographic documentation from the moment the incident occurred. No prior warning lights, symptoms, or error messages occurred.

While I was driving on the highway, the brakes of my car suddenly were violently activated and I had not touched the brakes. If there had been a car behind me, it would have been a major rear end collision. It was over quickly and I accelerated back to the normal speed. I talked to the Honda service mgr where I purchased the car and he said he was unaware of the problem although I see that that nearly 3 million Hondas have experienced this issue.