Yamaha E-Bike Error Code 81: Controller: circuit board temperature too high (125°C, including DC circuit) (What It Means + Fix)
Table of Contents Toggle TL;DR (1 sentence) What error code 81 means What the bike usually does when this code appears Fast checks (2–3 minutes) Step-by-step troubleshooting (safe DIY) Likely causes (most common) When to stop DIY and go to a shop Prevent it coming back Links (keep the “hub loop”) Source (for “real” codes)…
