2021 Honda Accord: false forward collision warnings

Filed Sep 19, 2026 · Driver assistance · NJ

Sudden braking; car comes to a complete stop and brakes so Hard. Most likely fault from Collision Mitigation Brakking system

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 Oct 21, 2025 · Brakes, Driver assistance · UT · crash

I was driving northbound in on I15 in Salt Lake City when a Home Depot Bucket blew into my lane. I slowed down to change lanes when the Collision Mitigation Braking System (CMBS) deployed without warning, bringing my car to an almost stop causing a semi tractor trailer to hit me from behind.

Filed Oct 19, 2025 · Brakes, Driver assistance · FL

What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle’s collision avoidance automatic braking system is malfunctioning. It engages unexpectedly while the vehicle is moving with normal traffic flow. The system is still installed and fully available for inspection upon request. How was your safety or the safety of others put at risk? The automatic braking system activates suddenly and without cause while I am driving at typical speeds (approximately 40–60 mph) with the flow of traffic. This unexpected braking creates a serious risk of rear-end collisions, both endangering me and putting other drivers at risk of crashing into my vehicle from behind. Has the problem been reproduced or confirmed by a dealer or independent service center? I have reported the issue to the dealer, but they have been unable to replicate the problem during their inspections. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? No, the vehicle and its braking system have not yet been inspected by the manufacturer, law enforcement, insurance representatives, or any other third parties. Were there any warning lamps, messages, or other symptoms of the problem prior to the failure, and when did they first appear? No warning lights, messages, or other indicators were present before the issue occurred. I purchased the vehicle last month, and the problem with the collision avoidance braking system has been present consistently since then.

Filed Sep 3, 2025 · SC

I would like to report an ongoing issue with my infotainment system. I reported to Honda, but was told there was nothing that they could do about it since I had not had the issue diagnosed in the shop. I did not want to go this route because I knew it would cost an enormous amount of money, especially after reading several reviews online of others having the same issue. I reported to the shop once and later discovered that there was no documentation when I took the vehicle to Fred Anderson in Greenville SC. The Tech stated he would reset to factory defaults. This did not fix the issue. As I have done more research, I have discovered that there was a recall on models between 2017-2020, but not 2021. I feel this is a safety issue because the GPS would go out at any minute as well as drop calls that have could be emergency calls. A glitching infotainment system in your 2021 Honda Accord can absolutely become a safety issue for several reasons: Driver Distraction – If the screen freezes, reboots, or doesn’t respond, I may be tempted to look at it or keep pressing buttons instead of focusing on the road. Even a few seconds of distraction can increase crash risk. Loss of Critical Features – Modern infotainment systems often control or display important functions such as: Backup camera, Navigation / maps, Hands-free calling and texting (via Bluetooth). Vehicle settings (like driver-assist features). If the system glitches, I could temporarily lose access to these safety aids. Impaired Communication – If Bluetooth cuts out or the system won’t connect, you may be more likely to handle your phone directly, which is unsafe and often illegal. In SC there is a new law for hands free use while driving. Malfunctioning Alerts – Some infotainment systems integrate with driver-assist warnings (lane departure, collision alerts, etc.). If the system glitches, those warnings may not display or may lag. Unexpected Resets -Sudden reboots frozen screens can startle you while driving,

Filed Jul 14, 2025 · Driver assistance · 98,000 miles · MD

The contact owns a 2021 Honda Accord. The contact stated while driving at approximately 30 MPH, the vehicle independently slowed down as if the brake pedal was depressed. The contact stated that a warning for the brakes and the collision mitigation and check engine warning lights were illuminated. The contact had the vehicle towed to a local dealer, where it was diagnosed and determined that the turbo charger needed to be replaced. The vehicle was repaired. The contact retrieved vehicle however, several warning lights were illuminated. The contact parked the vehicle and had not returned it to the dealer. The vehicle was not diagnosed and was not repaired. The manufacturer was informed of the failure. The contact researched online and related the failure to the federal safety agency Action Number: EA24002 (Forward Collision Avoidance). The failure mileage was approximately 98,000.

Filed Jun 5, 2025 · Brakes, Driver assistance · 71,080 miles · MN · crash

The contact owns a 2021 Honda Accord. The contact stated that while driving at 60 MPH, the vehicle's auto braking applied without warning. The vehicle was rear-ended by a possible 2024/2025 Buick Envista. The driver of the Buick left the scene of the crash. The brake warning light was flashing. The contact stated that the failure was related to the federal safety agency Action Number: EA24002 Forward Collision Avoidance. There were no reported injuries, air bag deployment or fire. A police report was filed. The driver was able to continue driving. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 71,080.T he VIN was invalid.

Filed May 18, 2024 · Driver assistance, Seat belts · CA

Rear seat belt will not click and lock in. With the forward collision warning there was times I was driving on the freeway where there is no vehicle in front of me and Hard brake on me and shows forward collision warning. This happened like 3 or 4 times

Filed May 18, 2023 · Driver assistance · TX

The collision mitigation brake system continues to come off, and today it made my car spin, and I almost crash into the media.

Filed May 31, 2022 · Driver assistance · 1,200 miles · IL

The contact owns a 2021 Honda Accord. The contact stated while driving approximately 45-50 MPH and switching lanes, the collision mitigation braking system engaged inadvertently. The forward collision warning light illuminated. The contact depressed the accelerator pedal and was able to continue to drive. The contact stated that the failure reoccurred several times while driving. The vehicle was taken to the dealer to be test-driven however, the mechanic was unable to duplicate the failure. The dealer also informed the contact that the collision mitigation braking system was operating as designed. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 1,200.