2021 Honda Accord: adaptive cruise control problems

Filed Oct 18, 2026 · Brakes, Electrical · FL

Vehicle: 2021 Honda Accord Sport Subject: Intermittent Electrical Malfunctions, Multiple Safety Warnings, and Loss of Acceleration I am reporting ongoing safety concerns involving my 2021 Honda Accord Sport. On multiple occasions, my vehicle has displayed several dashboard warnings, including brake system, electric parking brake, vehicle stability assist, hill-start assist, adaptive cruise control, and electric power steering warnings. These warnings have appeared intermittently in the past and sometimes disappeared on their own. On October 18, 2026, while traveling on the highway at approximately 65 mph, these warnings had already been displayed for approximately 30 minutes to an hour when my vehicle suddenly began struggling to accelerate. Despite pressing the accelerator, the vehicle continued losing speed, and the RPM gauge remained around 2,000 RPM. It felt as though something was holding the vehicle back. After several moments, the vehicle suddenly regained power, accelerated, and the RPM increased. This was particularly concerning because I was traveling at highway speed. I also experienced electrical problems with the interior lights. While the vehicle was running, neither the automatic interior lights nor the overhead lights near the rearview mirror would turn on. They remained inoperative after I turned off the vehicle. Later, the lights began working again, but I noticed the right overhead light fading while the left remained illuminated. The battery was replaced earlier this year, in 2026. I am concerned that these intermittent malfunctions could result in a sudden loss of power or failure of important vehicle safety systems while driving. I am requesting that these problems be documented and investigated for a potential safety defect or recall. I have photographs of the dashboard warnings available as supporting documentation.

Filed Sep 2, 2026 · Acceleration, Fuel system · AR

Unable to use cruise control Unable to use lane control Unable to use tire pressure gauge Unable to use auto brake system Car shakes due to a sudden decrease in engine performance. Turbocharger issues Powertrain System issues ECM Failure

Filed May 12, 2026 · Driver assistance · 62,000 miles · CA

The contact owns a 2021 Honda Accord. The contact stated that while driving at various speeds, the brakes would suddenly apply, stopping the vehicle immediately. The failure had become more persistent. The contact would immediately apply the accelerator, and the vehicle would gradually accelerate forward. The traction control failure, brake system failure, cruise control, and the mediation light were illuminated, all related to the various drive assistance systems within the vehicle. When attempting to shift from the sport mode to economy or regular modes, it shows as unable or failure. The vehicle had not been diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 62,000.

Filed Apr 15, 2026 · Driver assistance, Electrical · FL

The lights and warnings below popped up on my dash after the engine light had come on and then off again for about a week. See below, -Emission system problem Avoid heavy acceleration and high speed. See dealer -tpms light -brake system problem -brake hold system problem -electric power steering system problem -vehicle stability assist system problem -hill start assist problem -adaptive cruise control system problem -collision mitigation braking system problem -road departure mitigation system problem Went to get diagnosed at the dealership and was told that the turbo on my engine had failed. Mechanic said it had nothing to do with me and that it failed on its own. I saw that it was a reoccurring problem with other Honda owners with the same year, make, and model as mine but are being given the run around and no solution.

Filed Jun 7, 2025 · Driver assistance, Electrical · CO

Experienced CMBS with malfunctioning false breaking while no obstacle, acceleration delays (Features not available: Electric braking, lane departure, Electric power steering, Cruise control, Adaptive collusion prevention and brake system warning on dashboard).

Filed Nov 7, 2024 · Electrical · FL

Touch screen glitching and beeping, acts as if being touched and scrolls through settings and apps randomly; makes phone calls that can’t easily be disconnected, hangs up calls, enables or disables navigation. Many distracting and potentially dangerous glitches. Unsure if integrates into automated features and unsure if it will engage braking, steering, cruise control, etc. while driving. Replacement part indefinitely back ordered. Local and corporate uncooperative in answering questions regarding safety concerns. Touchscreen unresponsive frequently.

Filed Jun 2, 2024 · Acceleration, Driver assistance · CT

Driving on Highway at approximately 65 Miles Per Hour using the Adaptive Cruise Control. Car in front of us took a right hand exit. My 2021 Honda Accord activated the Braking System and applied the brakes, so I stepped on the accelerator thinking it would override the braking system. It had no effect. There were cars behind me at the time and luckily nobody was injured. I looked this up on the internet and found that it is a reported issue. That is why I am contacting you. Very concerned about the safety of my family.

Filed Jun 13, 2023 · Brakes, Driver assistance · PA

I was driving home in the rain and felt the car automatically braking when there was no car or object in front of me. The car was also slow to accelerate because the brakes were automatically applied. 5 miles later numerous warnings appeared on the dash and the following error messages came through my Hondalink app: Electric Parking Brake Problem, CMBS Problem, Adaptive Cruise Control Problem, and RDM Problem. Several times during this drive home the brakes automatically applied without any intervention from me or roadway object. I almost got rear-ended once when a car behind me had to slam on its brake when my car automatically braked without me doing anything. This is a very dangerous condition that should be looked further into as multiple drivers have reported brakes being applied without driver intervention or an apparent road hazard. How many complaints will it take before a recall is issued so other Honda drivers do not need to be put at risk?

Filed Jul 2, 2022 · Acceleration, Driver assistance · VA · crash

Car moving slowly and suddenly races and speeds UP. Hard to STOP it. Has happened twice, 8 to 10 Months apart.. First time was on a small driveway. Was able to STOP CAR , with no damages. 2nd occurrence i was pulling into a parking Space. Foot not on gas or brake and again the CAR accelerated. This Time the CAR hit a handicapped parking sign and pushed it over. The sign stopped the CAR with Assistance from me. There was a small drop in front of the CAR and a tree 10-15 Feet in front of the Hill. The passenger in my CAR would have been in severe trouble had I not gotten the CAR stopped. My husband thought i may have somehow activated the cruise control. But i was going less than 20 miles per hour each time. This could be a deadly problem if a Child or Someone Crossed in front of me.