2018 Honda Fit

The lane mitigation and brake system warning lights came on. The car swerved on its own off the road to the right. It put me onto the shoulder of the highway. I had to fight the steering wheel to get the car to move to the left to get back on the road. This happened twice during busy rush hour highway traffic. It also started braking periodically in the weeks leading up to this without any visible signs of being too close to an object or anything else. It was very unnerving.

Component/System Involved: The multi-purpose camera system on my 2018 Honda Fit has malfunctioned, disabling critical safety features such as Adaptive Cruise Control (ACC), Lane Keep Assist System (LKAS), and Collision Braking Warning System (CBWS). Safety Risk: The failure of these systems creates significant safety risks. Without ACC, the vehicle cannot maintain a safe distance from other vehicles. The LKAS no longer provides steering assistance to help stay in the lane, and the CBWS cannot detect or warn of potential collisions. These malfunctions increase the likelihood of accidents, especially during highway driving or in heavy traffic. Problem Reproduction and Confirmation: The issue has been reproduced and confirmed by Norm Reeves Honda Cerritos during an inspection on 8/13/25. Inspection Details: The vehicle has been inspected by a dealer/service center, which diagnosed the problem. However, the manufacturer has not offered a resolution, nor has the vehicle been inspected by police, insurance representatives, or other parties. Warning Indicators: Before the failure, warning messages appeared on the dashboard, including alerts for ACC, LKAS, and CBWS system malfunctions. These warnings initially appeared on 8/12/25 and became more frequent over time. I believe this issue may be a design or manufacturing defect affecting other vehicles of the same make and model. I urge the NHTSA to investigate this matter to determine if it represents a broader safety concern.

Multiple systems failure simultaneously. Lane Keep assist system, adaptive cruise control, braking system failure and automatic emergency braking as well as forward collision warning. This appears to be due to some fault within the system that multiple owners experience — many mentions of this issue in online forums. When taken to Honda they cannot even determine why but just start suggesting replacement of various systems to include the camera/radar but cannot guarantee this will fix. This is a safety issue and happens through no fault of the vehicle owner it just pops on one day and remains intermittent.

I have had my Honda fit for almost 7 years now and every winter I have an issue with the ADAS system. The car will throw a warning saying the sensor is obstructed and to clean off the windshield. Every time I check to make sure there's nothing obstructing the sensors. If I had to guess, the plastic covering is trapping heat from warming up the car and fogging the glass but I can't do anything about it since the plastic is not removable. It seems like a flaw in the design that operating the car with the heat on in winter can cause issues with the ADAS.

The car will randomly shut off the ACC, collision warning, and lane assist. The dealership says this is due to an error with the fuel injection system and fuel injectors need replaced. There Was a similar recall on the 2015-2916 Honda fit, but was supposedly fixed on later cars. This is still the same flaw but for some reason affects these other safety systems too.

All the dashboard lights came on in my car. I took it to the dealer and they said they needed to clean the injectors due to carbon buildup. My car has 42,000 miles on it and is 2018 Honda Fit. They charged me 613 dollars to clean the injectors. Then they updated the computer. Two days later all the lights came on again and was throwing a fourth cylinder misfire code 304. They told me they would have to replace the injectors for 2,300 dollars. The Honda only has 42,000 miles on it, and the dealer said he would not be able to cover the cost. I thought injectors were covered under the powertrain warranty, but he said it was covered under the 3 year 36,000 mile warranty. Clearly, from reading other complaints here, there is a major issue with the injectors.

The automated braking system deployed at maximum braking without warning 3 times in 60 miles of highway driving (this was the first time I had driven this car on a highway). The road in front was completely clear of both cars and debris for several miles, it was sunny without glare, and the road was dry. The one common factor was that all 3 times occurred while passing a semi truck, as I pulled level with the cab. I was thrown forward against the seatbelt while the car slammed on its brakes while beeping and flashing the orange 'BRAKE' warning, dropping from highway speeds by about 25 mph before I was able to intervene. Thankfully there was also no traffic behind me, so I was able to recover control of the vehicle, but otherwise this would have absolutely caused a collision. Prior to this incident, there were no warning signs or indications of a problem. I had purchased the vehicle as a Certified Pre-Owned vehicle less than a week before, at which point it had been thoroughly inspected by the dealership and certified as free from issues. I have reported the issue to the dealership, but from cursory searching online it appears this is a known, unremediated issue - a quote from Wilde East Towne Honda (not my dealer): "You may find that CMBS is giving you notifications and even feedback when no threat is detected. That is normal on occasions...CMBS picks up 'optical illusions' occasionally"