2025 Triumph Speed 400 problems

Filed Jul 12, 2026 · Electrical · UT

Inaccurate speedometer. Dash shows 46 actual speed 40

Filed Jul 12, 2026 · Electrical · UT

Speedometer is inaccurate. Guage indicates 46 actual speed 40

Filed Jun 10, 2026 · Electrical, Engine · VA

2025 Triumph Speed 400 — Moisture-Triggered Limp Mode and Loss of Turn Signals My 2025 Triumph Speed 400 enters limp mode and displays a check engine light and wrench warning whenever ridden in rain or high humidity. When this occurs, turn signals and hazard lights also stop functioning, leaving me without signaling capability in traffic. Both issues clear only after the bike dries out. The battery is disconnected and reset has not worked in the past, and continues not to help the issue. At my break-in service (~150 miles ago), I reported the issue. The dealer applied dielectric grease to the speedometer connectors and checked the battery terminals, but the fix was unverified as it didn’t rain until today. On 6/10/26 after riding to work in the rain, the bike entered full limp mode when I tried to leave — power was severely restricted and turn signals and hazards were completely inoperative. The simultaneous loss of power and signaling in traffic is a serious safety hazard with no advance warning to the rider. This is a documented issue across multiple owner forums affecting 2024 and 2025 Speed 400s, and Triumph is aware but has issued no recall or formal remedy. I am requesting the federal safety agency investigate and compel Triumph to issue a fix.

Filed Jan 16, 2026 · Engine, Transmission · GA

While riding at 15 to 20 miles an hour, the motorcycle engine installed without warning, causing a loss of power. This required an emergency maneuver to avoid being hit from behind. This is a recurring issue documented by the dealer.