EP8 vs Older STEPS: Key Differences

The Shimano EP8 (introduced 2020) and its successor the EP801 (2022) represent a significant update to the Shimano STEPS platform. The motor produces 85 Nm of torque — compared to 70 Nm on the E8000 — while being 300 grams lighter. Critically, Shimano changed the error code numbering convention with the EP8 generation.

Code prefix change: E8000 and older systems use W010, W011, W013. EP8 and EP801 use W100, W101, W103 for the same faults. The underlying cause and fix are identical — only the number differs.

EP8 / EP801 Code Reference

The following codes map EP8/EP801 codes to their E8000 equivalents and their meaning:

  • W100 (= W010): Motor overtemperature warning — reduce assist, allow cooling
  • W101 (= W011): Speed sensor warning — check magnet alignment and gap
  • W103 (= W013): Torque sensor startup warning — power off, remove foot from pedal, restart
  • E010: Drive unit internal fault — restart, apply firmware update, escalate to dealer if persistent
  • E020: Communication error — check all cable connectors
  • E033: Firmware mismatch — update via E-Tube Project app

E-Tube Project App: Your Primary Tool

The Shimano E-Tube Project app (iOS and Android) connects to EP8 and EP801 motors via Bluetooth without any additional hardware. Every EP8 rider should have this app installed. It provides: live error code display with plain-language descriptions, firmware update capability for all connected components, adjustable motor tuning (torque output, assist level sensitivity), and drivetrain setup guidance.

Updating firmware via the E-Tube Project app is the single most effective maintenance action an EP8 rider can take. Shimano regularly releases firmware updates that resolve known error code issues, improve thermal management, and refine torque sensor calibration.

EP801 Specific Notes

The EP801 (used on 2022+ Canyon, Orbea, Santa Cruz, and other premium eMTBs) adds Bluetooth connectivity directly to the motor and an updated torque sensor. The error code set is identical to the EP8. A notable EP801 improvement is reduced W103 frequency — the updated torque sensor initialisation is less sensitive to pedal position at startup, meaning experienced riders will see W103 far less often than on EP8 or E8000.