The contact owns a 2020 Honda Accord. The contact stated that while driving at approximately 30 MPH, the Collision Mitigation Braking System unexpectedly engaged, causing the vehicle to come to an abrupt stop, and the vehicle jerked while there was no other vehicle or obstacle nearby. The local dealer was contacted by phone and advised the contact to bring the vehicle in for a diagnostic test. The failure mileage was approximately 82,605.
2020 Honda Accord driver assistance problems
115 complaints (31% of all complaints for this car). Typical mileage when it fails: 12,000. 8 crashes reported.
- owner complaints
- 115
- of this car's complaints
- 31%
- typical mileage
- 12,000
- crashes
- 8
- recalls
- 0
Which part fails
- Automatic emergency braking82
- Warnings34
- Adaptive cruise control21
- Warning10
- Assist6
- Blind spot detection3
- Dynamic brake support/brake assist1
- Automatic emergency steering1
At what mileage
Complaints by mileage at the time of the problem.
0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+
Honda Accord driver assistance problems in other years
Specific symptoms reported on the 2020 Honda Accord driver assistance
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Related recalls
No recalls on record for this model year.
Related investigations
Inadvertent Automatic Emergency Braking
On February 21, 2022, the Office of Defects Investigation (ODI) opened Preliminary Evaluation (PE22003) to assess reports of inadvertent activation of the Collision Mitigation Braking System (CMBS), an automatic emergency braking (AEB) system, in model year 2017-2019 Honda CR-V and 2018-2019 Honda Accord vehicles. The reports allege that activation of the AEB system occurs while driving with no apparent obstruction in the vehicle's forward path, resulting in sudden vehicle deceleration. Honda indicated that they were aware of a total of X,XXX reports that may relate to the alleged defect. Honda provided analysis of the alleged defect and alleges that some customers possibly had an inadequate understanding of the CMBS and its limitations.  However, many consumer complaints allege that Honda dealerships were unable to reproduce the condition or state that they were informed that this is considered normal CMBS operation. To date, ODI has received a total of 1,294 consumer complaints of inadvertent activation of CMBS in 2017-2022 Honda CR-V and 2018-2022 Honda Accord vehicles. A total of 31 complaints alleged a crash and 50 alleged an injury. The Total column in the Failure Report Summary removes duplicate reports and shows the total number of reports with unique VINs from all Manufacturer, ODI, and EWR data sources. In some cases, there were multiple reports associated with a particular vehicle in which recurring failures were alleged. In total, there were X,XXX reports, 93 injury incidents and 47 crashes involving vehicles with unique VINs that may relate to the alleged defect. PE22-003 has been upgraded to an Engineering Analysis to further assess the scope, frequency, and potential safety related consequences of the inadvertent AEB activations. The scope has been expanded to include assessment of model year 2020-2022 Honda CR-V and Accord vehicles. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to
EA24002
What 2020 Honda Accord owners say
Most recent owner complaints, unedited.
Hello, I am requesting immediate attention to an issue with my vehicle that I believe is related to a factory defect. The recall service was completed, but the problem was not corrected. The warning lights are still illuminated on the instrument cluster, including ACC and LKAS. Since this issue appears to be related to a factory defect and the vehicle is still under warranty, I am requesting that the vehicle be properly diagnosed and repaired under the factory warranty at no cost to me. I am also concerned about the safety of operating the vehicle while these warning lights remain on. Please document this concern on the repair order and provide me with a clear explanation of the cause and the repairs needed. Please treat this as an urgent warranty repair request.
I was driving on the freeway at freeway speed with my Mom and daughter in the car and all of a sudden the car decelerated suddenly to almost a stop, sending us all flying forward. I felt like we had to have hit something, but we didn't; it just felt that way because of the sudden, abrupt stop while going freeway speed. Our bodies are sore this morning as a result. Thankfully, no one was directly behind me at the time, and we didn't get rear-ended. This could have definitely caused fatalities. If I were to have been killed, no one would have known it was a vehicle malfunction. They would have thought I braked hard for some unknown reason. Even if I braked hard, it wouldn't have caused such an impact; this felt like we hit a wall because the wheels seemed to just lock. Very frightening. I'll probably have to take my Mom to get looked over by a doctor due to the flying forward. Her seat belt flung her back, but for elderly people, it could cause some damage. It took me a moment to realize what happened.
The Break light flash on my dashboard when I was driving on route 42 doing 65mph
I was driving on 42 at 2:05 a.m. And I was heading towards the exit to get off and I started slowing down and after I took my foot off the brake, the brake light illuminated on my dashboard for me to hit the break, like something was in front of me and there wasn’t anything in front of me.
I was driving on route 42 at 11:52 PM and my brake light illuminated on my dashboard indicating me to hit the brake so I stepped on the break so my car wouldn't brake itself. There was nothing directly in front of me for that like to come on but it did. The highway was dry there was a little bit of cars on the highway but in front of me
The contact owns a 2020 Honda Accord. The contact stated that while driving on several occasions at various speeds, the messages "Emissions System Failure," "Electric Power Steering Failure," "Hill Start Assistant Failure," "Collision Mitigation," "Collision Road Departure," "TPMS Failure," "Brake System Failure”, “Brake Performance Reduced", "Vehicle Stability Assistance Failure," "Adaptive Cruise Control Failure", "Road Departure Mitigation Failure," and "Brake Hold System Failure" were displayed. The contact stated that the check engine, TPMS, brake system, traction control, and power steering warning lights were illuminated. The vehicle was taken to a dealer where it was diagnosed that the head gasket and turbocharger needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was unknown.
I was driving on [XXX] at around 1252AM, and my Brake light lite up on my dashboard, indicating me to press on the break or the car was going to break its self. The roads were clear and dry, there was barely any traffic. If I didn’t press on the brake when the car told me too it would have stopped it’s self cause me and my passenger to get thrown forward and me to get hit in the rear of my car. This has been going on for quite sometime. I talked to [XXX] from American Honda customer service back in December of 2025 about what was going on with my car. I have removed the license plate holder thinking that was causing it but it wasn’t. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
I’m taking my car to the body shop over five occasions and have to take it back one due for it being a computer chip, which was replaced, but the lights on my dash all of them comes on after the second start up. Cruise control doesn’t work brake code doesn’t work all the lights for staring brakes says to check everything.
I was driving on Route 42 today at around 3:45 and my brake light flashed across my dashboard like I needed to step on my break because there was something in front of me but there was nothing in front of me. This has been going on for over a year now I have reported it multiple times and I'm just trying to see if you guys are going to fix it or inspect it I've cleaned off my radar also to make sure that wasn't the problem and it still does it
Questions about the 2020 Honda Accord driver assistance
Does the 2020 Honda Accord have driver assistance problems?
Owners have filed 115 complaints about the driver assistance of the 2020 Honda Accord, 31% of all its complaints, more than any other problem.
At what mileage do 2020 Honda Accord driver assistance problems start?
The typical (median) mileage in owner complaints is 12,000 miles.
Was there a recall on the 2020 Honda Accord driver assistance?
There is no recall for this problem on this model year.
What year does the Honda Accord have the most driver assistance problems?
The Honda Accord model years with the most driver assistance complaints are 2018 (403 complaints), 2019 (178 complaints) and 2020 (115 complaints).
Other 2020 Honda Accord problems
Engine 77Fuel system 64Brakes 58Electrical 55Airbags 36Steering 23Transmission 16Acceleration 13Seats 8Body 7Seat belts 7Suspension 6Visibility 5Lights 4Tires 3Locks 1Wheels 1
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