Automatic Emergency Braking Problems of Honda Accord - part 1

Good morning, I have new Honda Accord 2020 which always been taken care of regular services and oil changes etc. This morning I tried to start my car going to work but suddenly all brake related warning signs came off. My card still not starting the engine. I researched online and found out many people who have same Honda facing same issues. So I figured it's better to be reported before someone gets really hurts while on road. Please find attached pictured with this incident report please.

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Left a store on a frontage rd, drove about 1/2 mile , car just breaking out of no where, stoped in the middle of the road, the dash stated breaking malfunction see dealer immidentaly car died, I restatred it , the dash still stated the same , the picture of the car had back lights flashing and the red break sign was on , took it to the nearest dealer and when they started it the warning system had erased. They inspected it, told me that they could not find anything wrong. I just leased it 2wks ago and only have driven it 3 times , not even a hundred miles and this happens. There were no warning signs of any kind . If I would have been approaching the freeway I could have been killed.

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Driving along at approximately 41 mph, cmbs unexpectedly activated for no apparent reason. There was no object in road to potentially collide with. Warning system barely activated before cmbs engaged braking very hard. Vehicle went from 41 mph to 31 mph in 2 seconds as recorded on dash cam. This is the 2nd occurrence in the same approximate location, both for no apparent reason & with no object in road ahead. Had an another car been following closely, this would have caused injury.

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On September 2, 2025 at 1004-1005 est, my car phantom braked, when there was nothing in front of me and this time instead of just flashing brake on the dashboard, it actually breaks itself and threw me into the steering wheel thank god my seatbelt caught me, but it really choked me up. This has happened quite a number of times before, but this is the first time that it breaked when I actually stepped on the brake pedal it break itself myself also. The component is the automatic breaking for the collision impact that keeps phantom breaking on me. It has never been looked at by a dealer or anyone otherwise. The lamp that came on was the break lamp where the rpm are at.

While driving my car suddenly felt like it was braking. The car beeped but no brake light appeared as when it thinks I am going to run into something. There were 2 incidents with nothing in front of me. One was at a low rate if speed and one was on a freeway. The car went back to normal after a second. The incidents were around 3 weeks apart.

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There has been multiple times that when I am driving on the highway doing 60 miles an hour, the dashboard will light up to brake the car when there is nothing in front of the car, no other car no trash nothing. It has done this on slower roads where the speed limit is 40 mph and under but it will actually brake the car and I have had cars behind me when this happens. This keeps happening multiply times a week.

Unknown. I will be driving and automatically it will lock the brakes and nobody will be in front of me. I tried turning it off but somehow it still ends up on. This has been doing it now for some but it’s getting worse and worse. Before it would just blink on the dash “ brake” but wouldn’t apply the brakes but recently it has been applying the brakes and going from 45mph to 60mph it has done it and giving bad whiplash. Now it’s starting to scare me because someone is going to end up rear - ending me and cause an accident. I tried talking to a dealership about it but they said they will look into it and never hear anything about it. I really am starting to be worried everytime I drive my car that something bad is going to happen. This needs to be fixed and diagnosed.

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My car be braking and nothing be in front of me. It detects something in front of me when nothing be there.

The contact owns a 2025 Honda Accord. The contact stated that while driving at any high speeds, the collision mitigation braking system (cmbs) engages independently. In addition, all 4 tires lock, and the emergency brake engages. A dealer was contacted. No warning light illuminated; however a warning message to "brake" would illuminate, but did not give the contact ample time to engage the brake pedal manually. The contact mentioned she sustained whiplash due to the failure. The contact also mentioned that the failure occurred on three different occasions. During the most recent failure, the contact mentioned driving at 40 mph, when the cmbs engaged independently. The vehicle was taken to the dealer, where it was diagnosed; however the diagnosis was unknown. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 211,000.

On August 7, 2025, the automatic braking system alerted with the sign break and then proceeded to stop the car when there was no object or vehicle in front of me. This would have been extremely dangerous. If there was someone behind me this is not the first time this has occurred it has happened several times.

The collision mitigation braking system (cmbs), which is part of Honda's advanced safety features, slammed on the brakes driving down the road at about 40 mph. When the vehicle slammed the brakes, me and the passenger were jerked forward with seatbelts on. Had a vehicle been behind us traveling it would have slammed into the back of my vehicle causing an accident. I will be contacting the dealer to address this problem as it just happened yesterday 8/3/2025. Although I did read that this complaint is currently under investigation. When the vehile slammed on the breaks, the brake warning light came on right after the brake was slammed and immediately went off.

The Honda collision mitigation braking system (cmbs) will randomly activate without any obstacles in front of the vehicle. Consequently, increasing the risk for car accidents, loss of control, and bodily harm. The car has not been inspected by a dealer or certified mechanic for this problem. However, the vehicle is available for inspection and repair as needed. While the incident occurs, the cmbs warning system will flash ‘brake’.

I am reporting two safety-related issues with my 2022 Honda Accord hybrid. 1. Head gasket failure at approximately 93,500 miles, the head gasket failed without any prior warning signs. The vehicle had been regularly maintained at Honda dealerships, with one service done by a third-party mechanic around 87,000 miles. There were no engine warning lights or coolant leak warnings before the incident. The engine temperature warning suddenly appeared while driving, and I immediately stopped the car. A Honda dealership confirmed the head gasket failure and quoted over $4,000 for repairs. This kind of major engine failure is highly unusual for such a new vehicle and raises serious concerns about long-term engine durability or possible design flaws in the cooling system or head gasket components. 2. False activation of automatic emergency braking (aeb) the vehicle’s automatic emergency braking system frequently activates or issues a warning while driving, even when there are no obstacles or vehicles nearby. This has happened multiple times and creates a sudden sense of panic, increasing the risk of being rear-ended or losing control of the vehicle. Both issues suggest potential safety defects in this model. I respectfully request that the national highway traffic safety administration investigate whether similar complaints have been reported for the 2022 Honda Accord hybrid, as these failures could pose significant safety risks.

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When driving my car it will phantom break when there is nothing in front of it going down the highway 5060 miles an hour and it’s done at numerous times. I have not been in an accident yet, but it’s something that keeps occurring on my car.

To whom it may concern, I am writing to formally report a serious safety issue involving the automatic emergency braking (aeb) system on my Honda Accord 2020. The system has been engaging randomly and without cause, abruptly applying the brakes when there is no obstacle or hazard present. On multiple occasions, this malfunction has occurred while driving at normal speeds, including on highways and in moderate traffic. These sudden, unprovoked braking events have created extremely dangerous situations, nearly causing rear-end collisions and putting both myself and other drivers at risk. Despite there being no obstruction in front of the vehicle, the system behaves as though an emergency stop is necessary. This issue not only undermines the purpose of the safety feature but also significantly increases the risk of an accident due to unexpected deceleration. I urge Honda to thoroughly investigate this issue, as it appears to be a potentially widespread and dangerous defect. I am requesting that the company: •address and correct the fault in my vehicle’s aeb system at no cost •provide a clear explanation of the root cause •inform me of any recalls or technical service bulletins (tsbs) related to this problem.

Parking brake suddenly engaged while in traffic car would not move. Car had to be towed brake pads were replaced but mechanic stated parking brake had defect that only the dealer can repair.

My car slammed on its own brakes hard out of nowhere with nothing in its forward. The first time it happened was about 9 months ago while I was driving on the highway, it was a quick moment of breaking without any reason, but the car didn't stop. Today it happened again, the speed was about 30 m/h, the car slammed hard on the brakes to an almost complete stop. I was lucky, nobody was behind.

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Emergency braking system engaged for no apparent reason with no other vehicles on the road. Potential for rear-end collision. This was the first event. Personally inspected forward looking sensors / camera for blockage, none found. Did not notice any messages or warning during the event. Wasn't looking at the dash during the event.

Driving down the road, no cars or obstacles in front of me. Out of nowhere the automatic emergency breaking came on. The car slammed on the breaks and very quickly came to a complete stop in the middle of the road. If there happened to be another car behind me they would have rear-ended me. There were no warnings prior to this happening.

Lights go crazy in dashboard apparently due to constan cylinder misfires, spark plugs changed, same issue, fuel injectors and coils changed, same happened keep it getting fix and the problem persist, making the car dangerous to drive, since it loses power since the car it’s not able to respond and work as it should be having engine, steering and brake issues, problem has been confirmed by dealer. It hasn’t been inspected by manufacturer. The lost of power and acceleration it’s probably one of the symptoms before all the light go on again. It’s been several times that this happens and I know for a fact that many people are experiencing this issues due to turbo or head gasket failure. Might get that inspected soon.

I bought this 2019 Honda Accord on June 30th from a company called greenville motor company. July 1st, I took the car to the Honda dealership to get a diagnostic to make sure everything was in good shape. The technician I spoke with did notice the car & stated that it had a problem with the previous owner which was the injectors. She told me that the light may not come on now but it may come on in the future. After I left the Honda dealership, I went to greenville motor company & showed them the diagnosis I had done at Honda. He said he didn't see anything wrong. On July 2nd, all of my dashboard lights came on. Took it back to greenville motor company, the tech there said I could pick it up July 3rd & drive it over the weekend. (basically he reset the lights so they wouldn't come on for a certain period of time). Within this time period I took it back to the Honda dealer & they told me that I also needed a turbo, they gave me the printout for that as well. Took it to greenville motor company, they agreed that I did. Need a turbo. Manager says he ordered turbo. I I don't remember the date I took it back but on July 12th, my dash lights came on again. I took it back to greenville motor company July 14th, July 18th greenville motor company called & said something on top of the turbo wasn't screwed on thats what was triggering the turbo code to show, so he never put on the turbo that he ordered I had it 2 hours & my dash lights came on again.

Vehicle will randomly slam on brakes to a dead stop, engaging my seatbelt when engine braking behind a vehicle. Usually happens on surface streets when the vehicle in front of me is turning into a driveway/tight right turn. My velocity is decreasing & I am not at risk of colliding with the vehicle every time. System does not seem to register engine braking with a manual transmission as “braking. ” I’ve nearly been rear ended several times due to coming to a dead stop in traffic. I’ve asked Honda how to permanently disable the system, with the only advice to turn it off manually every single time I start the vehicle.

When I am driving in an area near my home with road construction- there is a certain area that has a metal plate in the road and when I approach in from the east my car will automatically brake hard. Luckily this has not caused an accident but I suspect that it may because it is a busy road.

During interstate driving vehicle detected both road departure and engaged the emergency automated braking. The vehicle attempted to correct the "road departure" by steering the vehicle away from the perceived problem and engaged the brakes nearly causing a collision as it has done numerous times before. I have reported this to NHTSA and american Honda and await a repair of this dangerous issue. Honda has opened a case on this but have had 6 months and no response has been issued.

All lights on head dash are on , all components are not working properly or effected because of this. (engine light brake light abs light tire light traction control light , sensors out all) while driving vechile reduces power does not operate randomly , have to pull over shut the car off and turn it back on. Has high vibrations lot of shaking, stauling. I have had it looked at with multiple shops and dealer . Everybody is playing a guessing game and can not pin point what exactly it is . Was told it was spark plugs and coils, alternator , fuel injectors. All have been repaired, and still have all lights on dash and still facing every problem listed after repairs. Been inspected by manufacturer. Say not been resolved was told if it wasn’t what was already fixed they don’t know and that this is very common right now . It first started about a month ago.

Driving the vehicle at highway speeds the large orange “brake” warning illuminates and flashes, and the brake activates. This has happened approximately 5-6 times since I have owned the car. This started within 2 months of purchasing the vehicle. The dealer has tried replacing the front camera and I have changed the battery. None of this has fixed the issue. According to my innova 5610 code reader, there are 32 pending codes for the electric brake booster, including bring temperature too high, brake booster driver, circuit, overheat, brake pedal stroke sensor component, internal failure, brake pedal stroke sensor one circuit short to ground, brake pedal stroke sensor one circuit short to battery or open, brake pedal stroke sensor two circuit, short to ground, brake pedal stroke sensor two circuit short to battery or open, sensor voltage, a short circuit to ground, driver seatbelt sensor, vehicle, communication bus a performance, vehicle communication bus c performance, lost communication with the ecm/pcm a, f – can malfunction pcm – tcm, can communication failure with driving support system control unit, lost communication with vehicle, dynamics, control, module, lost communication with park brake control module, can reception error srs, can malfunction ecm/pcm gauge control, module, invalid data received – signal has too many transitions/events, invalid data received from transmission, control, module – event information, invalid data received from vehicle dynamic control module event information, electric parking brake system malfunction control module – internal electronic failure, battery voltage circuit voltage below threshold, battery circuit voltage above threshold, and control module input power a circuit open. After I changed the battery and took the vehicle to the dealer for recalibration they mentioned the pending items, but did not do anything about them or record them on their paperwork.

I purchased my Honda Accord June 21, 2024. For the first 3 months, the brake system indicator rectangle shape amber light (blinked on and off for several seconds) on 8 separate occasions when driving this car, so I brought the car to Honda dealer that concluded it must be dust on the brake for the next 3 months, the brake system indicator rectangle light (blinked amber on and off) on 6 separate occasions, the Honda dealer told me they could not find a problem with the brake, for the next 4 months,the brake system indicator rectangle light (blinked amber on and off) on 3 separate occasion , again the Honda dealer told me they could not find a problem but I noted that the dealer did not have record this on the work order. I then called Honda customer service (800-999-1009) support on June 23, 2025 at 1:17pm. I told the representative that the 2024 owners manual on page 84-85 did not have an amber brake indicator message among the 30 or so indicators in the manual. On page 493, the manual also mentions "if the brake system indicator (red) comes on or blinks, there is a malfunction in the brake system" on page 494, the manual also mentions "if the brake system indicator (red) comes on or blinks at the same time when the brake system indicator (amber), release the parking brake. The representative could not explain what a blinking amber brake system indicator meant and I should return car to the Honda dealer. Upon my insistence, my call was escalated and that a senior representative agreed that an blinking amber brake indicator explanation is not in the owners manual and could not provide me with an answer. Her best guess was that I was to close to a car in front of me (even though this has happened when there was not car in from of me). Can the NHTSA provide me with an explanation on why the brake system indicator rectangle light (blinked amber on and off) or have Honda provide the NHTSA with an explanation if this represents a dangerous situation to dri.

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Blown head gasket after taking my car in to Honda cars of rock hill SC, I had no issues, only took it to have the fuel injector recall done, they did a diagnostic nothing came up, they did the fuel injector recall repair, and they asked if they could do the oil change I told them yes, a week later, my car lost power on interstate 77n in rock hill south carolina. I was going about 70 mph and it dropped from 70 to 20 mph in a matter of seconds, I had little time to get out the lane, I could have been killed or killed someone else I was terrified. Every known light on my 2018 Honda Accord came on, I have a video of the lights on my dashboard. I had it towed back to Honda cars of rock hill on 5/30/2025 and was told I had a blown head gasket. . . I asked them how, they just put a fuel injector and nothing else was wrong with my car. They told me cost is $5500. 00, I told them there as nothing wrong with my car prior to them doing the recall, matt told me there was nothing I did, so I asked him what did they do to my car, I need them to replace my motor who knows what other damage happened my car had no issues.

Honda Accord hybrid touring edition 2022 [xxx] [xxx] complete brake system failure while pulling in to a starbucks parking lot in wayzata, mn. Braking system did not react or stop the car. Automatic braking system did not function either. As a result the car collided into a my burger wall. No dashboard warning lights. After collision police and ambulance arrived on the scene. Driver was taken to urgent care after sustaining soft tissue injuries affecting clavicle, sternum, neck and back. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I was driving on a city street at about 30mph. There was no one in front of me or behind me. Nothing in the road. The orange rectangular brake light came on for no reason, kept flashing and it felt as if the brakes were automatically being pumped, slowing the car down to a compete stop. In addition, I had no control of the steering. It was very dangerous situation which could have resulted in accident or injury.

My 2018 Honda Accord sport has been experiencing issues with its automatic emergency braking system, specifically the collision mitigation braking system (cmbs). The system has been activaing unexpectedly, causing the car to brake without an apparent reason. I’ve been trying to keep a list of locations that it has happened and it usually occurs under overpasses when the light changes from light to dark. I’ve reached out directly to Honda and the dealership and neither took my inquiry seriously.

It is uncertain which specific system/systems have failed/malfunctioned at this point. Despite frequent and consistent communication with Honda, no real attempt has been made to uncover the cause of this issue, and no solution has been provided. The vehicle has been, and is, available for inspection upon request. This is the 6th occurrence since the first event on 21 April 2025. This occurred on the interstate. During this event, the vehicle rapidly decelerated from 45 mph to 30 mph without the ability of the driver to intervene or take back control of the vehicle. This led to a very near miss as traffic was rapidly approaching the rear of my vehicle. At the time of the incident (5:52 pm), I was in the left lane. Traffic was moderate. The weather was rainy and wet. Cmbs was off. Acc was off. Problem has not yet been reproduced but dealer has verbally indicated that they get frequent complaints about the system. This includes one employee who has experienced this on his personal vehicle. Many dtcs have been recovered from the vehicle’s log. Manufacturer: yes, vehicle has spent 30 days, to date, in custody of Honda police: not yet. Will do immediately if advised insurance representatives: not yet. Will do immediately if advised others: no. Any work on the vehicle performed outside of Honda east cincinnati will void the warranty no warning or alert (audible or visual) lights were present before, during, or after the event.

My car won’t start it’s saying my brake system. It will turn on but won’t drive.

It is uncertain which specific system/systems have failed/malfunctioned at this point. Despite frequent and consistent communication with Honda, no real attempt has been made to uncover the cause of this issue, and no solution has been provided. The vehicle has been, and is, available for inspection upon request. This is the 5th occurrence since the first event on 21 April 2025. This occurred on the interstate. During this event, the vehicle rapidly decelerated from 65 mph to 25 mph without the ability of the driver to intervene or take back control of the vehicle. This led to a very near miss as traffic was rapidly approaching the rear of my vehicle. At the time of the incident (8:12 am), I was in the left lane. Traffic was light. The weather was rainy and wet. Cmbs was on. Acc was off. This very nearly resulted in total loss of control of the vehicle. Problem has not yet been reproduced but dealer has verbally indicated that they get frequent complaints about the system. This includes one employee who has experienced this on his personal vehicle. Many dtcs have been recovered from the vehicle’s log. Manufacturer: yes, vehicle has spent 30 days, to date, in custody of Honda police: not yet. Will do immediately if advised insurance representatives: not yet. Will do immediately if advised others: no. Any work on the vehicle performed outside of Honda east cincinnati will void the warranty no warning or alert (audible or visual) lights were present before, during, or after the event.

Woke up and started my car, all the lights were on including engine light. No adapter cruise, steering light was on. Screen also was saying avoid speeding. Every notification was telling me go to the dealer ship. I took it howdy Honda in texas and they said we will need to do a diagnostic and it was for 255 for to see what the problem was. They looked and said I had code for po172(rich) and misfire on p0301 told me I need to replace fuel injectors. Which cost 1933$. Which is way too much and fuel injectors a labor should be covered under federal emissions warranty but they said no. So I am filing a recall for fuel injectors for my 2022 Honda Accord sports se. I am unable to drive because it’s in limp mode. I also have documentation from howdy for quote.