2025 Triumph Speed 400 problems, complaints & recalls
Most-reported problem areas: Electrical System (2) · Power Train (1) · Exterior Lighting (1)
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (51)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Electrical System 2026-09-22 · COM2_35786 · Service Bulletin/Repair Instructions
dealer notice announcing the availability of daignostic software and dealers should begin using it immediately.
Electrical System 2026-07-14 · COM1-35109 · Service Bulletin/Repair Instructions
dealer notice announcing the availability of triumph diagnostic tool 2026-07 and dealers should begin using it immediately.
Electrical System 2026-06-23 · COM2 - 34886 · Service Bulletin/Repair Instructions
dealer notice announcing the availability of triumph diagnostic tool 2026-06.1 and dealers should begin using it immediately.
Electrical System 2026-05-19 · COM6 - 34491 · Service Bulletin/Repair Instructions
dealer notice announcing the availability of triumph diagnostic tool version 2026-06 and dealers should begin using it immediately.
Unknown Or Other 2026-05-19 · COM5 - 34490 · Service Bulletin/Repair Instructions
dealer notice announcing the availability of technical bulletin 264.
Unknown Or Other 2026-05-18 · TB264 · Service Bulletin/Repair Instructions
technical bulletin 264 provides instructions that relates to: triumph diagnostic tool - new motorcycle connection and diagnostics workflow, triumph diagnostic tool - end of support for microsoft windows 10.
Showing the 6 most recent of 51 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-07-12 · Electrical System“speedometer is inaccurate. guage indicates 46 actual speed 40…”
2026-07-12 · Electrical System“inaccurate speedometer. dash shows 46 actual speed 40…”
2026-06-10 · Exterior Lighting“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 iss…”
2026-01-16 · Power Train“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.…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.