2025 Honda Prologue

Upon start-up the driver display was off, showing no information. Center infotainment display remained on. Attempted infotainment reset by pressing and holding the hang-up call button on the steering wheel, and after approximately 30 seconds the infotainment display turned off, driver display remained off. Shutdown and started car, both screens remained off.

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.

On March 18, 2026, while driving a leased Honda Prologue in rush-hour traffic on a major highway in [XXX] , the vehicle suddenly shut down and would not restart for approximately two minutes. The incident occurred without any warning messages, alerts, or notifications and created an extremely dangerous situation. At the time of the incident, traffic had been stop-and-go for approximately three miles. Without warning, the radio turned off, all dashboard lights went dark, and the vehicle lost power and stopped moving. I attempted to restart the car multiple times, but it would not turn on. On approximately the seventh or eighth attempt, the vehicle finally restarted, allowing me to safely pull off the highway. Fortunately, the slow-moving traffic prevented a rear-end collision with vehicles behind me. I began leasing the vehicle this past summer, and at the time of the incident it had fewer than 2,600 miles on the odometer. I took the vehicle to the dealership that same evening. During their inspection, the dealership identified several “Lost Communication” diagnostic trouble codes in the vehicle logs. The most significant code identified was B1B42 – Start/Stop Switch Not Plausible. The service team also noted that the manufacturer’s troubleshooting checklist references codes B1B15 or B1B15 2A; however, those codes were not present. Based on the findings, the dealership replaced the S38 Start/Stop Switch. I resumed driving the vehicle two days ago and have not yet experienced any further issues. However, I remain extremely concerned about the seriousness of this failure. If this same issue were to occur again at higher speeds or in faster-moving traffic, it could result in a severe accident. The complete loss of power without warning represents a significant safety risk and warrants further review. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

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.