Honda Prologue collision warning problems

Filed Nov 2, 2026 · Brakes, Driver assistance · CA

My 2024 Honda Prologue has repeatedly applied sudden, unexpected braking while I was driving, even though there was no vehicle, pedestrian, or obstruction in front of me. The incidents have occurred at different speeds, including approximately 45 mph and 10–15 mph. The vehicle abruptly decelerates without an apparent reason, creating a serious risk of a rear-end collision and endangering me, my passengers, and other motorists. I have sought assistance from authorized Honda dealerships on multiple occasions. During a previous service visit, certain safety features were disabled, but the unexpected braking occurred again afterward. The problem has continued despite my attempts to have it addressed. On October 9, 2026, I brought the vehicle to San Leandro Honda. The dealership documented my complaint that the vehicle randomly brakes when nothing is in front of it. The vehicle was inspected, but the concern remains unresolved. I am not aware of the dealership successfully reproducing the unexpected braking during its inspection. I have also reported this safety concern to American Honda and requested a vehicle repurchase. The manufacturer is reviewing my request. I am concerned that the automatic emergency braking or related collision avoidance system may be malfunctioning. The exact cause remains unknown. I request that the federal safety agency investigate this recurring unexpected-braking condition because of the potential for a serious collision.

Filed Sep 14, 2026 · Acceleration, Brakes · CA

forward and rear collision avoidance system (AEB) activating without a hazard, causing sudden stops in the middle of traffic

Filed Jul 17, 2026 · Driver assistance · CA

I was traveling on Interstate 80 with adaptive cruise control set at 70. The cruise control normally recognizes slower cars ahead and slows or stops as necessary. I saw that cars were stopped ahead so I reduced the cruise control setting to 60 to "help" it slow down. However, we came up fast on the stopped cars and the car did not slow. I had to manually brake to avoid a collision. The car's speed was about 67 when I applied the brakes. The car acted like slowing to the new cruise control setting of 60 was overriding the collision avoidance. I recently had much of the software in the car updated due to a recall and the adaptive cruise control seems to be acting differently now. Weather was clear, around 4pm, and the roads were dry. We were Eastbound around a slight left curve (not sharp) and traffic was stopped ahead in all 5 lanes, so the system should have noticed the obstacles ahead.

Filed Jun 25, 2026 · Driver assistance · CA · crash

Component: Honda Collision Mitigation Braking System (CMBS/AEB). Vehicle is in GEICO insurance claim process, not yet released. EDR data has not been extracted and is available for inspection if preserved before the vehicle changes hands. Safety risk: Two failure modes. (1) False AEB activations occurred multiple times — while driving at ~20 mph and while reversing at low speed, with no obstacle present. Hard sudden braking with no warning created rear-collision risk. (2) On 6/23/2026 at ~9:50 AM, AEB failed to activate when I struck a parked vehicle. Airbags deployed on impact, briefly incapacitating me. My foot remained on the accelerator. Standard post-collision safety design calls for automatic power cutoff and brake application after airbag deployment, specifically to prevent continued acceleration when a driver may be incapacitated. This vehicle did neither — it continued accelerating, significantly worsening the collision. I sustained soreness and bruising. Dealer confirmation: I did not take the vehicle to a dealer for the phantom braking. Per other the federal safety agency complaints for the Prologue and Honda's broader CMBS issues (Engineering Analysis EA25002), dealers have reportedly been unable to replicate the issue and told owners the behavior is normal. Inspections: GEICO assessed the vehicle for the claim. No inspection by Honda or independent mechanic for AEB specifically. EDR data not yet extracted. Warning indicators: During false AEB activations, the collision warning appeared on the dashboard at the moment of braking, not before. No advance warning. No persistent warning lamps or diagnostic messages indicating CMBS malfunction at any point during ownership. Phantom braking occurred intermittently throughout ownership.

Filed Jun 9, 2026 · Brakes, Driver assistance · NM

Description of Safety Defect: The Automatic Emergency Braking (AEB) / Forward Collision Avoidance system is severely malfunctioning. On multiple occasions, the vehicle has experienced "phantom braking"—abruptly slamming on the brakes for no reason whatsoever. There were no obstacles, pedestrians, or vehicles ahead to trigger the system. This malfunction is happening at high speeds on major highways. Safety Risk and Impact: This issue represents an immediate and terrifying safety hazard. Unexpectedly slowing to a sudden stop at highway speeds completely compromises vehicle control and leaves me at an extreme risk of being rear-ended by high-speed traffic. It is a severe danger to myself, my passengers, and every other driver on the road. While the vehicle is currently subject to a manufacturer recall regarding the backup camera and other software updates, this specific, dangerous braking behavior makes the vehicle incredibly unsafe to operate. I request that the federal safety agency review this issue immediately to determine if a broader safety investigation or expanded recall is required for the 2024 Honda Prologue.

Filed May 20, 2026 · Airbags, Driver assistance · TX · crash

I have had two safety issues with this vehicle where there were system failures that did not record DTC codes. And an additional failure that does not record codes and cannot be duplicated. After leasing the vehicle for seventeen months, and during repair for an unrelated non-safety issue, it was discovered that the steering wheel airbag had a loose connection. No warning appeared at any time on the instrument panels. As well the one pedal function would switch into regular drive mode, as in a gas powered vehicle, randomly. After multiple tries and incidents the dealer service department has been unable to duplicate. Then on March 6 of this year I bought in the vehicle yet again for this one pedal failure, and was notified there was an existing recall. This software update was performed. On March 17, just 11 days after the update, while backing into my garage with the garage door going up the windshield wiper was clipped by the door, destroying both the wiper and shattering the back window. I have backed into my garage thousands of times and never had an issue. Why this happened on this date I do not know. What I do know is that the vehicle gave no warnings and did not break for the object. At the time my dogs were clipped into their seat belt harnesses in the center well. By a miracle no glass shattered beyond the back storage area and I was able to safely remove them. I checked after and all of the collision warning systems were listed as active, including automatic braking for rear collisions. I had the dealership run scans twice and all scans showed no DTC codes and all systems active. I can only assume that all prior updates have failed, and there is a substantial defect to the vehicles ability to communicate. I have a copy of the scan performed. The second scan was run on April 9 because the dealership failed to provide a printed copy of the first. I have that second scan. My vehicle fails to communicate or activate essential information, a safety hazard.

Filed Apr 28, 2026 · Brakes, Driver assistance · TX · crash

Shortly after purchase, I observed damaged/torn underhood insulation and reported the condition to the selling dealership, with concern that the vehicle should be inspected for related issues. Prior to a crash incident, I experienced concerns involving braking-related behavior and advanced driver assistance features, including lane assist and object/collision warning functions. During the crash, while reacting to a roadway hazard, the vehicle swerved and struck a pole, and I did not experience warning or intervention from driver assistance features as expected. Following the incident, a diagnostic pre-scan identified multiple faults involving brake control, radar sensors, image processing, and communication systems. Since the incident, similar concerns have continued, including recurring braking/driver assistance concerns, and the issues remain unresolved. I am submitting this complaint due to concern that braking and advanced driver assistance systems may not have functioned as intended and may present an ongoing safety risk.

Filed Mar 24, 2026 · Driver assistance · TX

We are experiencing 2 problems. The primary issue is both front axle. CV joints are clicking and making poppy noises when you turn either right or left. secondary issue, the car is having is the. Reverse collision warning problem. It is engaging and breaking the vehicle. When there is nothing behind it, it happens constantly. And we've had to turn the feature off on the vehicle's information head unit settings to stop it from causing harsh breaking. When backing up.

Filed Mar 8, 2026 · Steering, Transmission · CA

Vehicle was taken to dealer for click noise Hurd while turning right around only 4k miles. The dealer confirmed the noise using a mechanics ear they said as of right now no replacement has been authorized. Honda is investigating. January 2026 car started clicking while in curves and any movement in steering. Still no fix. March 2026 still not fix because Honda hasn’t investigated yet and now my system has horrible issues with the auto break and rear collision avoidance system. Hondas “fix” turn it off. Why wouldn’t get a touring model with all those features just to have them tuned off.

Filed Feb 22, 2026 · Brakes, Driver assistance · CA · crash

On 2/19/2026 I was taking an freeway exit ramp from I 15 south to Carrol Carrol canyon and I stepped on the brake but the car did not slow (my perception was it was speeding up), the vehicle collision warning did not sound and the vehicle did not emergency brake, therefore I hit a stopped vehicle at a stoplight. The air bags did not deploy. Attached pictures: Left side is the vehicle was rear ended. Right side is the Honda Prologue