2021 Honda Ridgeline: false forward collision warnings

Filed Jul 23, 2026 · Driver assistance · FL

When driving the vehicle suddenly displayed warning and failure lights for the following: Adaptive Cruise Control, Lane Keep Assist, Road Departure, High Beam Support, and Collision Mitigation. The vehicle in the past regularly experiences issues with oncoming traffic (especially on 2 lane roads) when it comes to auto braking and forward crash warnings so I immediately brought the vehicle home as I was worried for my safety and the safety of others on the road that if these systems were now warning of malfunction the vehicle might auto brake in traffic for no reason and cause a crash. I took the vehicle in following this as I looked online and discovered there were multiple recalls on this vehicle for other various issues and I wanted the dealer to fix those in addition to determining if this was part of one of the recalls also. The dealership has diagnosed the issue as the forward multi-purpose camera and is stating it needs to be replaced to correct the safety issues of the vehicle. I reviewed online and found that just a coupe years ago this part was approx $800 and the dealer is not charging over $1600 for the part. The other issue is that I paid for the part and the dealer claims this part will not even ship until August 26 (over a month away). Additionally I have further researched this issue and found that it is a common failure on Honda and Acura vehicles and creates a major safety concern, yet Honda Motors has refused to address the issue and handle this as a recall as it should be done. New vehicles should not be regularly experiencing catastrophic safety system failures regularly and the manufacture not be held liable for the damages and not be able to fix the part or car in a timely manner. The fact the parts are in such short supply and backorder further attests to the common failure of this part. I would appreciate your immediate review and action of this matter to ensure that Honda is held accountable for the major safety failures they have created.

Filed Jul 14, 2026 · Driver assistance, Electrical · FL

My 2021 Honda Ridgeline Sport experienced failure of the forward-facing Honda Sensing camera system. This camera controls safety features including Collision Mitigation Braking, Lane Keeping Assist, and Adaptive Cruise Control. The failure disables safety assistance features. Honda acknowledged the issue but refused to provide full repair coverage and only offered $941 toward a repair costing significantly more. I believe a safety-related camera failure should be investigated as a potential defect

Filed Feb 22, 2026 · Driver assistance · VT

Forward brake assist, collision mitigation, auto headlight dash lights came on sporadically. As of today the lights are now on constant and unable to clear. Advised that the forward facing camera most likely died and a replacement due to recalibration would be 1500-2000..

Filed Sep 27, 2025 · Driver assistance · CA

2021 Honda Ridgeline RTL-E. Part number 36160-T6Z-A62-M1 failure, hard code U3000-49. Results in total loss of Honda Sense Safety system. Including Collision Mitigation Braking System, Road Departure Mitigation System, Adaptive Cruise Control, Lane Keeping Assist System, Traffic Sign Recognition, Auto High-Beam Headlights. This appears to be a fairly common issue across Honda models where the multipurpose camera fails, generally due to heat from exposure to sun. The replacement cost and required re-calibration via the dealer is ~$2000. Living in northern California with extreme heat, I will assume this problem will resurface after a few years resulting in another $2000+ repair.

Filed Jan 18, 2025 · Driver assistance · CA

At 48,000 miles, the vehicle began to experience multiple Advanced Driver Assistance Systems problems, including Adaptive Cruise Control, Forward Collision Warning, Automatic Emergency Braking, Forward Collision Warning, Lane Departure Warning, and Lane Keeping Assistance, which rendered all these systems inoperable. Systems that were designed to mitigate collisions became non-functional, and continuous warnings on the dashboard were a distraction while driving. Dealer scanned the vehicle with a code U300-40 Multipurpose Camera Unit/Millimeter Wave Radar Internal Electronic Failure, and diagnosed a failure of the multipurpose camera, which was then replaced and recalibrated. I have retained the failed unit after paying to have the replacement installed and calibrated. All warning lamps for the above mentioned systems flashed on my dashboard every time the vehicle was started, prior to the dealer repair. The safety of the driver and those around them was affected because repairs for this safety feature suite may be cost prohibitive to some ($2000) and they just won't fix it.

Filed May 18, 2022 · Driver assistance · WI

Automatic emergency braking has engaged on a two way highway curve a couple times until I disabled it for the remainder of the trip. The “Brake” forward collision warning screen and alarm sounds frequently on 4-lane 2-way 30 mph road with a slight curve which it mistakes car in adjacent oncoming lane as a car it may collide with, I was able to eliminate it from applying brakes be adjusting sensitivity to low but the warning still pops up. Additionally, the automatic brights feature is inadequate resulting in flashing/blinding oncoming drivers, I have resulted in turning the feature off which process is more complicated than it should be.

Filed May 25, 2021 · Driver assistance · GA

I have a 2021 Honda Ridgeline Sport equipped with CMBS an automatic braking system that is supposed to be a safety feature, but actually makes the car more dangerous. The problem with the Ridgeline Sport collision mitigation braking system is that it attempts to mitigate crashes when the system thinks an obstacle is ahead, but it is a false warning, and there are no actual obstacles. It appears there is a software or sensor defect in the Honda Sensing technology causing the vehicle to issue warnings and alerts to the driver and the potential to automatically hit the brakes without warning when there are no obstacles in front of the vehicle and it has not deviated from its lane. Service Advisor/Mechanic at dealership called it a computer glitch. Nothing they can do. Taking it back again to have it on record; dealership tried to fix vehicle. This vehicle is potentially dangerous with no way to correct concern at this time. Problem continues since March 2021.