Shimano STEPS Error Code E024 (Bike System Communication Error): Meaning + Fix Checklist
TL;DR
E024 = A communication error with the bicycle system; system may not start.
Official next step: Make sure cables are not loose or improperly connected.
Quick fix (safe DIY first)
- Power off; check that the visible connectors (display, switch, battery mount) are seated.
- Re-seat removable display and restart.
- If it keeps returning, have a dealer check the wiring harness and connectors.
60-second checks (the things that cause repeat codes)
- Did it begin after a handlebar change, crash, or transport that could tug cables?
- Any intermittent display/switch behavior along with this code?
What usually causes E024
- 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 yanking on cables to ‘test’ them—inspect visually instead.
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/