Shimano STEPS Error Code E033 (Firmware Incompatible): Meaning + Fix Checklist
TL;DR
E033 = Current firmware doesn’t support system operation; assistance may stop.
Official next step: Connect to E-TUBE PROJECT and update firmware for all units to the latest version.
Quick fix (safe DIY first)
- If you can, connect with E-TUBE PROJECT (app/PC) and check for updates.
- Make sure your phone/app version is current and the bike has sufficient battery charge.
- If you can’t update or components aren’t detected, a dealer update is the fastest route.
60-second checks (the things that cause repeat codes)
- Did it appear right after an update or after installing a new display/switch/battery?
- Are there mixed-generation parts on the bike (older display with newer system, etc.)?
What usually causes E033
- Loose or intermittent connectors (battery mount, motor harness, display/switch).
- Water/corrosion at contacts after rain/washing.
- Firmware/compatibility mismatch after service or a component swap.
- In some cases, an internal sensor or control-unit fault that needs dealer diagnostics.
When to stop DIY (go to a Shimano STEPS dealer)
Go to a dealer if:
– The code returns immediately after a clean restart.
– Assistance cuts in/out while riding (safety issue).
– You see damaged wiring, bent pins, corrosion, or water intrusion.
– The official remedy for the code is “consult an agency/dealer.”
Don’t do this
- Avoid partially-updating one component and stopping—complete updates across all units.
Related guides (closed-loop)
- Shimano STEPS error codes index: https://jieli-electric.com/shimano-steps-error-codes/
- E-bike error codes hub: https://jieli-electric.com/e-bike-error-codes/
- Speed & power thresholds: https://jieli-electric.com/speed-power-thresholds/
- Laws & Safety Hub: https://jieli-electric.com/laws-safety/