NHTSA Complaint #11719218 — 2025 HONDA PROLOGUE

The vehicle has twice displayed a “Service High Voltage System” warning followed by “Reduced Acceleration – Drive With Care.” When this occurs, the vehicle enters a reduced-power (turtle) mode that severely limits acceleration. Cabin heat also stopped working, and the vehicle would not charge beyond approximately 25%, restricting driving range. OnStar diagnostics reported a critical error. The vehicle and diagnostic history are available for inspection upon request. The first incident occurred while driving around town. Although I was close to home, the reduced acceleration created concern because the vehicle could not respond normally to traffic. The second incident was significantly more dangerous and occurred in heavy traffic and on the freeway about 40 miles from home during heavy rain. The limited acceleration made merging and maintaining a safe traffic speed difficult, placing myself and others at risk. I have only been able to get the dealer to take the vehicle in one time, specifically for this issue, and that was because the warning lights were still on at arrival. Staff observed the warnings at check-in, but by the time the vehicle reached the service area, the lights had cleared. The dealer stated they could not perform repairs without active warnings, though stored codes reportedly indicated a low-voltage condition. Additionally, a clicking noise from the wheel area began about 1,500 miles ago and occurs consistently when turning, similar to a CV axle concern. During a separate visit, the dealer put in writing that they could not do anything about the noise and did not diagnose or inspect it, which left me uneasy about potential drivetrain safety. The intermittent high-voltage fault, reduced acceleration, charging limitation, loss of heat, and unresolved drivetrain noise create ongoing safety concerns due to the unpredictable nature of the failures.