2020 Honda Accord: adaptive cruise control problems

Filed Oct 28, 2026 · Electrical · FL

Unknown cause - Heavy Traffic I get all warning lights (idiot) come on. No performance loss but every advisory and caution is illuminated. Tested battery 550amps and regulator was putting out 14 volts so all seemed fine. Check battery terminals and connections, all good. After two days lights go away and everything works fine. When lights and advisory are on, no cruise control, TMPS, lane departure, assisted steering, and anything else in the caution light display doesn't work. Good thing all other aspects of the car work fine. Unable to determine the issue with Why this happens. Seen on line others have had this same issue.

Filed Aug 25, 2026 · Driver assistance, Engine · SC

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.

Filed Aug 24, 2026 · Driver assistance, Electrical · OH · crash · 1 injury

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.

Filed Jan 23, 2026 · Driver assistance, Electrical · 35,000 miles · OH

The contact owns a 2020 Honda Accord. The contact stated that while driving at an undisclosed speed, several unknown warning lights illuminated, and the Forward Collision Avoidance message was displayed. The vehicle was taken to the dealer. The contact was informed that the radar sensor, located on the front bumper, indicated that the vehicle was involved in a crash. The contact stated that the vehicle was not involved in a crash. The vehicle was repaired. The contact stated that on a separate occasion, while driving at an undisclosed speed, the vehicle experienced phantom braking twice. After several minutes, the vehicle returned to normal functionality. The “BRAKE” message was displayed. The contact stated that the failure had occurred while driving on the expressway. The vehicle was not taken to the dealer or an independent mechanic to be repaired. Most recently, while driving at an undisclosed speed, several warning lights were illuminated and remained illuminated. Additionally, the cruise control and Lane Departure warning lights failed to function as intended. The vehicle also failed to accelerate as intended while depressing the accelerator pedal. The contact's wife pulled to the side of the road, turned off, and restarted the vehicle. The vehicle returned to driving as intended. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 35,000.

Filed Jan 13, 2026 · Electrical, Engine · MS

I have constantly had to replace spark plugs within the last year — all lights are on dashboard. Finally took it and got a P0372 code, rough idling and misfiring, and stalling. Car once cut off on me while driving. Took it to the Honda dealership and it is indeed my fuel injectors and gasket. I have tried to get in touch about a possible recall but the Honda Manufacturer are failing to release a recall. With all lights on dashboard, NO features of the car can be used (cruise control, road departure, lane keep assist, collision mitigation, hill start assist, traction control, brake hold, and tpms) I’m looking forward to a recall coming as soon as possible. I have done my research and thousands of people are having the SAME issue, it is frustrating especially with the cost of work having to be done. Nobody should have to purchase a new car because of a defect of the manufacturer or too lazy to investigate the issue. HONDA Salesmen and mechanics all say the same thing about the 1.5L Sports model. Over 3,400 worth of work due to a problem I did not cause.

Filed Dec 11, 2025 · OH

It is unknown what system failed. While coasting to slow for the stopped car in front of me, the car began aggressively accelerating without warning. Adaptive and standard cruise control were both off. Lane keep assist and road departure were also switched off. Due to the slick nature of the road, the acceleration left me traveling far too fast with little space to stop. After sliding to a stop, I was within a foot from the car in front of me. This failure very nearly caused an at-fault accident which there was nothing more I could do. Note that this happened roughly 40 mins into a drive, which was otherwise uneventful. No warning lights were present before, during, or after the issue. This car has been having phantom braking issues and power loss issues consistently since March and has spent significant time in Honda's hands for this issue. The vehicle has come to a near stop on the highway from the previous braking issues and has lost power, stranding me in traffic on a highway. It is suspected that the same system failure that caused those issues has come back up again. To date, thousands have been spent on repair "guesses" and tow bills with no end in sight to these safety issues. This vehicle has become a liability and, as a result, inspections are strongly encouraged. I have included photos of the floor mats as they were at the time, properly secured and not near either pedal.

Filed Oct 7, 2025 · Acceleration, Electrical · MS

All lights have popped up on dash. Stayed on for 2 days back in july and then went off. Came back on 2 days ago (oct 5th) and have not went off yet. LKA, cruise control, parking brake light, TPMS, traction control, and engine light.

Filed Aug 15, 2025 · Engine · OK

When I turned my car on after work every warning light on the dashboard was on. A few of the warning messages read: Collision Mitigation Braking System Problem, Adaptive Cruise Control System Problem, Hill Start Assist Problem, Electric Power Steering System Problem. I first took it to Oreilly's to have the diagnostics ran. They told me the ignition coils needed to be replaces. We replaced the ignition coils and the spark plugs. The lights stayed off for about 3-4 days and then the same thing happened again. I took it to the dealership to be checked out and they told me that the head gasket had failed and coolant was leaking into the cylinder and causing the engine to overheat.

Filed Nov 18, 2024 · Driver assistance, Electrical · GA

My blinker won't appear on the dash. My trunk won't open. My back up camera won't come on at all. Can't adjust my exterior lights, stuck on the dimmest setting and can't change. Lights will also flicker and I have no control over it. My radio screen told me to enter a code but wouldn't allow me to. My break system light was on. There is warning reading adaptive cruise control see dealer, automatic emergency braking see dealer, lane departure warning see dealer. Doors locked and unlocked while driving. Air condition wasn't blowing the temperature it said, and acting as it was on low when it was on the highest setting. It is available for inspection upon request. I brought my car into a Honda dealership today. My car had to stay overnight because they were unable to address the problem. There were no prior problems or warnings beforehand. All these problems first appeared when I started my car for the first time on November 14, 2024. These put myself and others at risk because the doors locked and unlocked which could have caused us to get trapped in. The lights not working put me at risk at night because I could not see the road that good.

Filed Aug 18, 2024 · Driver assistance · MS

Have taken my car to dealership 3 separate times for all warning lights illuminated. Last time they replaced the transmission for a CVT belt prematurely breaking and all codes went away for one day. Now all are present again. Emmisions system warning, lane departure warning, cruise control warning, exc. Every single light never goes out. Just spent 6k on a car that had under 100,000 miles because I was told it was the transmission belt only to come home and have the exact issues happen. The day it was taken to the shop, it stalled in the road and almost caused an accident on a major highway. At this point, I'm afraid to drive it.

Filed Apr 17, 2024 · Acceleration · 50,000 miles · KY

The contact owns a 2020 Honda Accord. The contact stated that while driving at an undisclosed speed, the cruise control function failed, and the vehicle decelerated independently. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 50,000.

Filed Jan 24, 2024 · Tires · CA

My Honda accord has been acting up and it has Several problems including, adaptive cruise control system problem, collision mitigation braking system problem, road departure mitigation system problem, electric power steering system problem steering assist reduced, see your dealer, emissions system problem aviod heavy acceleration and high speed. Vehicle stability assist system Problem, traction and handling.Hill start asist. make an appeal and the car is having too much problems and it's costing me a lot of money!