2021 Honda Civic: adaptive cruise control problems

Filed Aug 5, 2026 · Driver assistance · TX

while driving last week with my family, doing some grocery shopping, we got on the highway which is 75mph in our 2021 Honda Civic and it had a catastrophic failure on its ADAS system out of nowhere it stopped and made my car swerve off the road and applied the breaks like it detected a car in front of us, it took us from 75 to 0 pretty darn fast fortunately no one was behind us, after the event im not able to use any features that involve the camera which includes crucial features of the car including cruise control, i can't even see what any info that is supposed to be displayed on the dash, I took it to the dealership where they said that their ADAS system doing this's a common occurrence and that most likely the camera it self will need replacement, i truly believe this to be a very dangerous feature that should be looked into and if the camera is prone to getting messed up like they said they are there should be a recall on this equipment before there's a bad accident! also yes my vehicle is and can be inspected whenever it is needed and no we didn't have any problems whatsoever with the ADAS system before it just failed

Filed Jun 20, 2026 · Acceleration, Brakes · OH

Cruise control does not disengage upon electronic parking brake being engaged while moving, causing the car to accelerate aggressively after the brake is released. While it does disengage after enough speed is lost, it should disengage immediately as it does when the brake pedal is tapped

Filed Jan 9, 2026 · Acceleration, Brakes · 108,000 miles · FL

The contact owns a 2021 Honda Civic. The contact stated that while driving approximately 37 MPH, the vehicle stalled. The check engine, master cylinder, and adaptive cruise control warning lights were illuminated. The vehicle was taken to a dealer, where it was diagnosed and determined that the brake master cylinder, fuel pump, and ignition coils needed to be replaced. The contact researched and was made aware of an unknown recall; however, the VIN was not under recall. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 108,000.

Filed May 8, 2024 · Brakes, Driver assistance · CA

The front sensor is too sensitive. If there is another car using a turn lane, the Civic will try to brake and will not pass the car. If another car is ahead on a curve, the automatic braking kicks in. This tends to only happen when using cruise control. It is dangerous on the freeway. The sudden braking could cause me to be rearended. I've been lucky, so far, and have only received dirty looks from the drivers that were behind me as they passed. Since it doesn't happen every single time, there seems no way to reproduce it. No one has inspected it for defects. No warning lights, beeps or messages appear before the braking starts. This has been happening since I first bought the car in 2022, but seems to be more frequent now. Probably the reason it was returned... in my opinion.

Filed May 8, 2024 · Brakes, Driver assistance · CA

The front sensor is too sensitive. If there is another car using a turn lane, the Civic will try to brake and will not pass the car. If another car is ahead on a curve, the automatic braking kicks in. This tends to only happen when using cruise control. It is dangerous on the freeway. The sudden braking could cause me to be rearended. I've been lucky, so far, and have only received dirty looks from the drivers that were behind me as they passed. Since it doesn't happen every single time, there seems no way to reproduce it. No one has inspected it for defects. No warning lights, beeps or messages appear before the braking starts. This has been happening since I first bought the car in 2022, but seems to be more frequent now. Probably the reason it was returned... in my opinion.

Filed May 8, 2024 · Brakes, Driver assistance · CA

The front sensor is too sensitive. If there is another car using a turn lane, the Civic will try to brake and will not pass the car. If another car is ahead on a curve, the automatic braking kicks in. This tends to only happen when using cruise control. It is dangerous on the freeway. The sudden braking could cause me to be rearended. I've been lucky, so far, and have only received dirty looks from the drivers that were behind me as they passed. Since it doesn't happen every single time, there seems no way to reproduce it. No one has inspected it for defects. No warning lights, beeps or messages appear before the braking starts. This has been happening since I first bought the car in 2022, but seems to be more frequent now. Probably the reason it was returned... in my opinion.

Filed Feb 22, 2024 · Brakes · CA

The problem is unintended braking. It is possible for this malfunction would cause the car to be rear ended. Have not taken it to the dealer... yet. There is no warning, the car suddenly starts to brake while in cruise control mode without any other cars being near.

Filed Jun 16, 2023 · Driver assistance, Steering · 18,480 miles · CA

The contact owns a 2021 Honda Civic. The contact stated that while driving, the Apple's car play screen went blank. While merging into the left lane, the Automatic Emergency Braking feature engaged. The vehicle was taken to the local dealer who reset the battery but was unable to duplicate the failure. Upon leaving the dealer and driving 25 MPH, the steering wheel was tight, and the vehicle continued to drift towards the left. The brakes, adaptive cruise control, and stability control warning lights were illuminated. The vehicle was taken back to the local dealer but was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 18,480.

Filed Nov 28, 2022 · Electrical · TX

The coating on the wiring harness is soy based and rodents chew the wires causing multiple electronic failures. Power steering failed, Adaptive Cruise Control failed, Automatic Emergency Braking failed, Lane Keeping Assistance failed. Vehicle is extremely unsafe!

Filed Sep 18, 2022 · Driver assistance · VA

Forward collision warning and braking has falsely activated with no vehicles ahead of car. First, "BRAKE" warning flashed for no reason while driving on a three lane road on Virginia Rt 286 and Rt 50 interchange. Second, driving in right lane, vehicle ahead was taking exit and was clear of my path, car flashed BRAKE warning, then started braking. Third, while using Adaptive Cruise Control (ACC) on highway, a passing car changed lanes into my lane. Due to distance, a car length, and smaller speed difference, emergency brakes activated. However, if a passing car operating at a faster speed (>5 mph est.) the car won't brake. The third problem is annoying as it creates an unsafe situation for people following too close (which they should not). Additionally, my brain is processing the situation faster than the HONDA SENSE can, Honda needs to expand their recall from Accord, CR-V, and Pilot to ALL vehicles with HONDA SENSE.

Filed May 28, 2022 · Driver assistance · KY

Driving home from work. Cruise set at 73mph. I had just passed another car and was about 600 yrd in front of them on the PKWY, when the car just started breaking and ding, I get multiple warnings on the dash as I'm trying to get out of the way of other vehicles. the car drove normal the next 5 miles under my control but the dash is still lit with a Collision Mitigation system problem, Adaptive Cruise Control Problem, Road Departure Mitigations system problem, Drive Carefully systems initializing problem, Brakes system light. I'll note that there was not bad weather, there was no rain or snow. it was 80F. There was no impact, accident, etc.

Filed Apr 9, 2022 · Driver assistance · AZ

Car will randomly hit the brakes when adaptive cruise control is on. It will hit the brakes even though it doesn’t detect anyone in front, it will slow down a good 10-15mph before speeding back up.