Shimano STEPS E‑Bike Error Codes

If you ride a bike with a Shimano STEPS drive system and your display shows an error code, this page helps you:

This hub currently contains 14 code pages for Shimano STEPS.

Table of Contents

Start here: the 60‑second “don’t make it worse” checklist

Stop safely and take a photo of the code (and any blinking patterns).
Power off fully (wait ~10–20 seconds). If needed, remove the battery briefly.
Check the obvious connectors you can reach without disassembly (battery seat, display mount, visible harness plugs).
If the bike cuts power unpredictably, smells hot, or shows battery/over‑current faults: stop riding and get it inspected.

What you’re seeing	Do this first	When to stop DIY
Code shows after rain / washing	Dry contacts, reseat connectors, restart	Corrosion, bent pins, repeat code
Code shows only on bumps	Suspect loose battery/connector fit	Repeat cutouts in traffic
Code appears right after charging	Let battery rest, restart, re-check	Battery voltage / internal faults repeat
Code appears during hard climbs	Lower assist, increase cadence, cool down	Overheat/overcurrent keeps returning
Code returns immediately on restart	Go straight to the code page below	Dealer-level diagnostics likely

Start with the closest match, then follow the related links at the bottom of each page (that’s the closed‑loop).

Mistake	What it causes	Better move
Turning the bike on while pushing hard on the pedals	Sensor init errors / instant re-trigger	Power on with no load on pedals
Pressure-washing the motor/battery/display area	Water in connectors → comm faults	Gentle rinse, then dry + protect contacts
Ignoring “only happens on bumps”	Intermittent power loss (unsafe)	Check battery latch/seat + harness strain
Chasing firmware without basics	Repeat faults + partial updates	Do connectors first, then update all units
Riding through battery/overcurrent faults	Heat + damage risk	Stop riding; get battery/controller checked