2024 TRIUMPH SPEED 400 Electrical System Problems

Odometer is approximately 5% off (reads too far). This impact service intervals and estimations for range. Speedometer is fully 10% off (overestimates speed). This affects safety, because it impacts your perceived speed. This is unacceptable on a new bike.

Bike shut off electrically while traveling at highway speeds. Signal flashers and emergencies failed and there was no throttle response. Check engine light came on and traction control disabled light came on. Bike displayed an error code of P2138 and P2122. Bike was unable to be safely ridden after being shut down and restarted. The bike could be ridden after starting for a short time before the throttle cut out again and complete loss of power. Emergency flasher functionality was intermittent with each attempt at starting the engine again.

The motorcycle cuts out when slowing down—engine just dies, but all the electrical stays on. This is a brand-new bike with only 500 miles on it. It happened while I was riding, and I suddenly had no power. Luckily, I was on the right side of the road and managed to coast to the shoulder safely, but it could’ve gone a lot worse. There were no prior warning lights. I scheduled an inspection, but the earliest appointment isn’t until later this month. In the meantime, I did some digging—this doesn’t seem like an isolated issue. A quick search shows a lot of riders are having the same problem. It’s not just a software bug—forums, independent sites, even YouTube videos are all showing the same failure.

Coming to a stop the engine just quit, as if I turned the ignition switch off. The dash was also blank. I turned the switch to the off position and then back to the on position, and it started as normal. I have read about this same sort of thing happening to numerous other riders of this bike. Triumph needs to have a recall to fix the glitch in the ecu.