Adaptive Cruise Control Problems of Honda Accord - part 1

Problem summary: while using the vehicle’s traffic assist / adaptive cruise control (system that controls acceleration and braking in traffic), the vehicle unexpectedly accelerated toward a vehicle directly ahead as if no lead vehicle was present. This created an imminent rear-end collision risk. The issue occurred twice in the same drive. Incident details: on 18 Dec 2025 at about 5-15mph/ “stop-and-go traffic”], I was driving with traffic assist / adaptive cruise control enabled, which normally manages throttle and braking in traffic. I was following a semi tractor (no trailer attached). The semi was approximately 15–20 feet in front of me. While the system was engaged and operating normally moments before, the vehicle accelerated forward as if the lane was clear, despite the semi being directly ahead. I had to apply the brakes manually to prevent a collision. A short time later in the same traffic situation, the vehicle did it again—it accelerated toward the same type of lead vehicle and I again had to brake to avoid rear-ending it. During the second event, I observed the instrument cluster / driver display showing the lead semi incorrectly identified as a passenger car instead of a truck, and the display showed that “car” accelerating away, which was inaccurate and did not match real conditions. This suggests the system may have misclassified or failed to track the lead vehicle, leading to unintended acceleration.

While engaging adaptive cruise control on highway speed, all the sudden I lost the sight of the car in front of me on the display, almost causing a collision, I also lost the correct waze display. After I stopped the car, shut off engine, then restart the car, re-engaging adaptive cruise control, both problems disappeared. This is an intermittent problem, it should be ASAP investigated then recalled due to huge safety concern !.

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While driving my 2020 Honda Accord hybrid, VIN [xxx] , the car would start exhibiting rough engine feels, and all of the dashboard lights would come on. The car would lose power at highway speeds, and I’d have to pull over to turn the car off and on. When checking on obdii meter, getting p0301 codes. I have replaced the coils and plugs twice and still not better. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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There has been a recall on newer cars for the loss of power this is a similar to that problem.

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While driving in adaptive cruise control, a vehicle in the other lane was slowing down and turning right, but my car started applying the brakes for no reason. This has caused panic for me, since it was a 45 mph zone, and it was ok.

While driving my 2019 Honda Accord, after about five minutes on the road, multiple warning lights suddenly appeared on the dashboard. The emission system, brake system, power steering, tpms, acc, hill start assist, collision mitigation, and vehicle stability assist warnings all came on at the same time. The alerts caused concern for safety, as several major systems such as steering assist, braking, and driver-assist features appeared to malfunction simultaneously. The issue seems related to an electrical or charging system failure (such as the alternator or battery), since all of these systems rely on stable voltage to operate correctly. The incident occurred without warning and could have resulted in loss of steering assist or engine power while driving.

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The warning lights for many areas has come on without warning. The car runs and drives fine. Took it to Honda. They want between 500 - 2500 to resolve the issue and replace the front radar. This appears to be a consistent problem for these 2018 Hondas. I already had to have the fuel injectors replaced at 48k miles. Another common Honda problem. Please help us as consumers.

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These also are warning signals that keep coming on I took it to autozone obd scanner said is was misfire cylinder2got spark plug changed and engine coil still showing same thing on scanner.

The issue involves the adaptive cruise control and automatic emergency braking systems. When engaged, the system intermittently and unexpectedly applies full braking force while I am changing lanes on the freeway, even when no vehicle is directly in front of my car. This has occurred multiple times at highway speeds, causing the car to slam on the brakes abruptly, which poses a serious safety risk particularly when other vehicles are following closely behind. The issue most commonly happens when the adaptive cruise control is active, but it has also occurred occasionally when the system is not engaged. There are no consistent warning messages or error indicators before the event, aside from the brief flashing of the emergency brake light at the moment of braking. The problem has not yet been inspected or confirmed by a dealer, manufacturer, or independent service center.

In 2 instances the car put on brakes for no reason. Nothing was in front of car. I was traveling roughly 70 mph and car slowed down and brake indicator came on, also going 75 with cruise control on and the system that brakes the car slowed the car down and then just quit working. Warning lights came on saying system failure but after car was turned off then turned back on there were no warnings.

Summary of incident: for approximately two years, my vehicle has experienced random electrical issues. All dashboard warning lights will flash at random times. When I take the vehicle to the dealership (bell Honda), the problem disappears before it can be diagnosed. On September 27, 2025, and again on September 28, 2025, the vehicle completely stopped and shut off while I was driving. It would not restart. The hazard lights were stuck on and could not be turned off. This left me stranded and in a dangerous situation. After approximately 2-3 minutes, the vehicle was able to restart, but numerous warning lights remained illuminated on the dashboard. I had the vehicle tested with a diagnostic tool at an autozone, but no apparent issues were found in the system. Additional information: this is an ongoing and unresolved safety issue that Honda has failed to address. This electrical problem, which causes the vehicle to shut down unexpectedly, is a significant safety hazard. This issue is in addition to another ongoing problem with the remote start system, which Honda has refused to diagnose and fix. Consequences and concerns: the unexpected shutdown of the vehicle while in operation is extremely dangerous and could lead to a serious accident. The inability to use hazard lights properly further increases the risk to myself and other drivers. The intermittent nature of the problem makes it difficult to diagnose, but the consistent occurrence poses a serious risk that requires immediate investigation by Honda and the NHTSA.

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When traveling on an interstate highway in the left lane of a 2-lane highway with the adaptive cruise control turned on. Passing a tractor trailer going slower in the right lane, the car will apply the brakes unexpectedly. The dash will briefly show a "ghost" truck crossing into the left lane. The unexpected braking causes any vehicle behind the Accord to brake. Putting those vehicles and any behind them at risk. Smart Honda of des moines looked at the car on sept. 22, 2025 reported no error codes and nothing could be done. If the Accord hugs the far left shoulder, no "ghost" breaking occurs. If the adaptive cruise control is turn off and regular cruise control is turned on, no "ghost" braking occurs.

When it is cold outside my acc light comes on and when I started my car the other day it read emissons service problem avoid heavy acceleration and high speed. That was just 1 among 7 other service warning that popped up.

My son was driving home from work when car suddenly went into limp mode with check engine light and all other safety light came on the dash. Driving around 50mph and my son nearly collided with multiple cars as the became hard to steer and brakes unreliable. Luckily no one was hurt this time. Car has 83k miles. Was taken to the dealer and diagnostics run and provided with a $5000. Repair to replace the head gasket due to coolant leaking into cylinder #3 causing misfires. I have reached out to Honda of America with the issue.

All 4 warnings came on about a month ago - no safety systems & no cruise control at all. I could drive 50 miles and they'd go off until eventually they did not. Now I find through the forums that this is very common for the 2017 Honda Accord & hybrid! and, the dealers knowing this are charging over $2,000 for a simple camera! so, they know these have a high failure rate, are not fixing them, and are price gouging us! please help us all on the roads out there!.

Advanced driver assistance systems (adas) this has been ongoing since I had the car and have taken to dear ship several times and they say it to happen, so they get the messages and the messages are there. I look it on google and there have several complaints about this issue and I have Honda and they are very rude about it, I have even call here and the young pay no mine what soever told me to call Honda I need mt=y problem resolve please, I am scared to drive my out state , I am [xxx] and live in north carolina and these people cannot drive. I have pictures which I sent as attachments. Somebody please help me. My payments' are 655. 00 a month and need to fill safe driving this vehicle information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Component/system: collision mitigation braking system (cmbs) or related software. Vehicle available for inspection. Safety risk: vehicle brakes or decelerates unexpectedly during normal driving, risking rear-end collisions. Most recent incident on August 23, 2025, required override by pressing accelerator and shifting to neutral in traffic. Reproduction: dealer could not replicate issue during may 16, 2025 visit. No diagnostic codes found. Radar and braking systems reported as “operating normally. ” a second evaluation occurred after September 5, 2025, with no resolution; issue persists. Inspection: inspected by Honda dealership twice—on may 16, 2025 (invoice #488382) and again after September 5, 2025. No third-party inspections. Symptoms: braking occurs in sport, normal, and econ modes. Happens when accelerating from stop or easing off accelerator. Brake light activates falsely. No warning lamps or messages prior to failure. Issue has occurred 10+ times over the past year. Related software issues: radio failure (resolved via software update). Clock shows incorrect time. Apple carplay fails to connect until restart. Navigation compass shows concentric circles.

This is an ongoing problem - -- on startup, the vehicle reports 4 system warnings that shut off the cruise control and abs brakes as well as the other safety systems. This is an intermittent problem. -- the dealer states that the camera is dead and wants $2,500 to replace and calibrate it. This is a common response from dealers I see in all the forums. -- I have found a work-around that is not documented in forums yet. -- if we keep our foot on the brake until after the electronics start sequence finishes, no errors every time -- if we take our foot off the brake when the car starts, but before the electronics finish, we get errors every time. This is a dangerous, high-frequency, extremely expensive problem if we follow the dealers suggestions. I do not know what the root cause is, but I know it is not a $2,500 problem. And, I am very concerned about the people driving without the safety features due to the excessive and unnecessary cost.

Head gasket blown on a 2018 Honda Accord 1. 5 turbo. Yes, yes warning lights have appeared.

I had been driving down highway and all of a sudden my car put on brakes hard. Thank goodness no one was behind me. I had dealer turn off that feature so it wouldn't happen again. I still experience my brake light flashing when nothing in road to brake for but doesn't brake on its own. Issue having now is issues starting car and once it starts I recieved a collision mediations issue pop-up on display saying see dealer now. Cruise control issue, and on dash has traction control saying ignitionating continue driving. The braking issue started right after purchase in 2018. The starting issue started yesterday 7/25/2025.

All warning lights turn on on the dash board. I replaced the battery, airbag module, and abs module and I'm still having the same issue.

I was behind another vehicle with the adaptive cruise control on and been following the for some distance at a speed below the cruise control setting. Warning came on for the braking mitigation, cruise control disengaged, vehicle began coasting but did not brake. I continued home driving without any other changes, but warning stayed on. After arriving turned vehicle off and restarted, warning did not come back on. I have not driven vehicle since. I checked and found other reports of similar problems and am filing this report. Will continue driving with extra caution and report any other occurrences.

My car started shaking like it didn’t want to go. My engine light came on. Then it showed road departure mitigation system problem, collision mitigation system problem, adaptive. Those control problem, and emissions system problem then says engine is not functioning properly.

On [xxx] my car while driving suddenly reported abs brake system failure, together with that other warnings flashed adaptive cruise, ps system (eps) failure etc. With difficulty I was able to stop the car and pull over. Same day I called Honda service hq and lodged a complaint case number [xxx]. The car has 57,478 miles and is properly maintained. Honda suggested that I drive the car over to a dealership. I am unwilling to drive due to serious safety concerns. Another followup email was sent on July 8th to acs@ahm. Honda. Com but has resulted in no response. I am a [xxx] and even though its a serious safety incidence, Honda has shown no signs of concern . Please advise and help me out, the company should get it towed and fix the issue free of charge. Thank you information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Unknown.

The contact owns a 2017 Honda Accord. The contact stated that there was a failure with the adaptive cruise control (acc) and lane keeping assist system (lkas) system. The contact stated that while driving at an undisclosed speed, the lkas and adaptive cruise control messages were displayed. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 150,000.

Car goes in limp mode once the brake system lights come on. When the brake light system comes on, none of the functions for the automatic breaks or electrical portion of my vehicle works. The car will act as if it will not accelerate right before the codes start to appear on the car.

The vehicle has an emission system error along with all other errors, car also hesitates to accelerate. Yes it is dangerous a failing turbocharger can result in a noticeable decrease in engine power, especially at higher speeds. Diagnostic : confirmed by dealership. The car was looked at the dealership mechanics nothing happened to where I need any others. It’s just been lagging getting up into speed etc. It popped up a month ago the emission light and went away. Came back two days ago which today is 6/20. Engine system problem tire pressure monitor system electric power steering problem cmbs problem adaptive cruise control problem cmbs problem all lights flashes on screen.

This is about the 5th time this has happened to the car. All warning lights appeared spontaneously while driving. The lights would turn off if the car was turned off for a long period of time or is we disconnected battery for a long period of time. We have tried to research the problem and no one seems to know what the cause or permanent fix is.

The vehicle was totally inoperable and suddenly came to stop was lucky that was driving in a local road where there was no vehicle, suddenly all different warning signs were coming on the dashboard and couldnt drive at all and vehicle was totally stalled. It was very dangerous situation luckliy I was just came off a very busy road otherwise coudl have been major incident. Currently the vehicle is at dealership nto sure what they will say but just wanted to report this as it is very dangerous situation.

The contact owns a 2016 Honda Accord. The contact stated that the messages "adaptive cruise control failure", "lane keep assist failure", and "forward collision avoidance failure" were displayed. Additionally, the contact stated that the infotainment system made an abnormal, loud, startling, and static sound intermittently while driving. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not notified of the failure. The failure mileage was approximately 196,000.

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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 7th occurrence since the first event on 21 April 2025. This occurred on the interstate. During this event, the vehicle rapidly decelerated from 70 mph to 60 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 (6:21 pm), I was in the right lane. Traffic was heavy. The weather was overcast and dry in tire path. 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.

If car is idling for over 1 minute, all lights on dash come on. When all lights on, car wont wont go over mph, car will randomly sputter in highway when going over 1rpm and will stall randomly. Reported on reddit by multiple people and when I went in to get it diagnosed it was the fuel injector issue.

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 4th occurrence since the first event on 21 April 2025. This occurred on the interstate. During this event, the vehicle rapidly decelerated from 70 mph to 55 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 (8:09 am), I was in the right lane. Traffic was very light. The weather was overcast but dry. Cmbs was on. Acc was on. 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.

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 3rd occurrence since the first event on 21 April 2025. This occurred on the interstate. During this event, the vehicle rapidly decelerated from 70 mph to 65 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, I was in the right middle lane. Traffic was light. The weather was clear and dry. Cmbs was on. 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.