2025 Honda Prologue

The contact owns a 2025 Honda Prologue. The contact stated that on several occasions while driving at undisclosed speeds and removing the foot off the accelerator pedal, the vehicle unexpectedly came to an immediate stop. The Auto Hold, service brake assist, service stability link, high voltage light, and ABS warning lights remained illuminated. The vehicle was taken to a local dealer where the vehicle was diagnosed, and the contact was informed that the dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 10,000.

While driving normally, my 2025 Honda Prologue experienced an immediate, catastrophic mechanical and electronic failure in both the steering and braking systems. The steering wheel completely locked up/failed to respond, and the brakes became completely non-functional simultaneously, causing an absolute loss of control of the vehicle. Due to this sudden system failure, the vehicle veered off course and crashed, resulting in severe structural damage, complete destruction of the front passenger-side suspension, and rendering the vehicle a total loss. American Honda Motor Co. Corporate was immediately notified of this severe safety defect (Case No. 16372717. However, Honda Corporate has explicitly refused to send an engineer or inspector to evaluate the vehicle's electronic or mechanical logs, and they also refused to provide their denial statement in writing. The vehicle remains un-repaired as evidence of this dangerous factory defect.

While driving with cruise control engaged, the car had a false positive for forward collision detection and slammed on the brakes at full Highway speed. After about one of second of emergency braking the car released the brakes and resumed cruise control as normal. There were NO other vehicles on the road in front or to the side of us at the time. Due to the unexpected braking, the vehicle following us almost collided into us. The event triggered just before the shadow of the bridge was on road of the underpass. I suspect it was the shadow that might have contributed to this event. However, this is not the first time the vehicle has had false positives in the forward collision detection system. We have experienced many of these, but typically at lower speeds. Generally speaking the “triple beep” and associated Heads Us Display red “brake” symbols briefly flash, then goes away without engaging the brakes automatically, again with these there are no other vehicles present. We have called two different dealers to report this and they tell us there is no associated TSB/service bulletin or recall for our vehicle and no software update for this. We tell them that GM has had several software updates for their Ultium platform with their other vehicles to fix this, but there is still nothing from Honda. There is a SB 25-051 for the 2024 prologues that would seem to address this but it’s not applicable to the 2025 according to them even though the symptoms are the same. This needs to be looked into as BOTH dealers told us that they had several other customers complaining about the same thing.

The issue involves a failure of the braking system and related electronic control systems in a 2025 Honda Prologue. Prior to the failure, the vehicle displayed repeated warning messages including “Single Pedal Unavailable” and “Auto Hold Unavailable.” These warnings began appearing within approximately three weeks of taking delivery and became more frequent over time. The primary safety incident occurred while driving on a highway. Multiple warning indicators appeared simultaneously, including battery and maintenance alerts, and the vehicle began to decelerate automatically. When the brake pedal was applied, the brakes were completely unresponsive, creating a life-threatening situation. I was forced to continue driving for approximately one mile before bringing the vehicle to a stop using the parking brake. This incident placed both myself and other road users at significant risk due to the inability to slow or stop the vehicle under normal braking conditions at highway speed. The vehicle was towed to a Honda dealership (Folsom Lake Honda) for inspection and repair. The dealer returned the vehicle stating that the issue had been addressed. However, the same warning messages reappeared, and a second incident involving brake malfunction occurred, confirming that the problem was not resolved. The issue has been inspected by an authorized Honda service center, and the vehicle was diagnosed and repaired once, but the defect recurred after the repair. The vehicle has also been reported to the manufacturer (American Honda Motor Co.) for further action. This is a serious safety concern involving loss of braking capability at highway speeds, and the problem has occurred more than once despite attempted repairs.

Vehicle: 2025 Honda Prologue Location: Sacramento, California Date of Incident: [XXX] What failed or malfunctioned The vehicle experienced a sudden loss of directional stability involving the steering system, brake-by-wire system, and electronic stability control (ESC). Steering and braking inputs did not produce proportional vehicle response. What happened While driving under normal conditions, the vehicle began drifting to the left. I attempted to steer back to the right and applied braking; however, the vehicle did not respond as expected. Electronic stability control did not appear to engage or correct the loss of control. The vehicle then deviated from its intended path, overturned, and struck a fence. The vehicle was declared a total loss. No other vehicles were involved, and no injuries occurred. Safety risk This failure created an immediate and serious safety risk. The loss of steering and braking effectiveness could have resulted in severe injury or fatality. The rollover demonstrates a critical safety concern. Warning signs No warning lights, messages, or symptoms were present prior to the failure. The event occurred suddenly without notice. Inspections The vehicle was inspected by police and insurance representatives. The manufacturer has not yet inspected the vehicle. The vehicle remains available for inspection through the insurance provider. Dealer confirmation The issue has not yet been reproduced due to the vehicle being totaled. Additional concerns The vehicle’s behavior was inconsistent with normal operation of safety-critical systems designed to maintain vehicle control. I am concerned about system performance, calibration, or possible electronic control failure. Manufacturer contact I reported this issue to Honda Customer Care by phone and requested escalation to engineering review. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)