E-Bike Error Code Reference: Complete Lookup Table for All Major Brands
E-Bike Error Code Reference: Complete Lookup Table for All Major Brands
If your e-bike display suddenly flashes a code like E004, 30, or 21, you don’t need to panic. This is the most comprehensive cross-brand e-bike error code reference on the web, covering 175+ codes across 20+ major brands. Use the lookup table below to identify the problem, its severity, and whether you can fix it at home or need a shop.
Cross-Brand E-Bike Error Code Lookup Table
| Error Code | Brand(s) | Meaning | Severity | Quick Fix | When to Contact Support |
|---|---|---|---|---|---|
| 04 / E004 | Bosch, Shimano, Bafang | Throttle or speed sensor fault | Medium | Check throttle connector; clean sensor magnet | After cleaning and reconnecting |
| 06 / E006 | Bosch, Brose | Motor temperature too high | Medium | Let motor cool 15–30 minutes; avoid steep climbs | If code returns after cool-down |
| 11 / E011 | Shimano | Battery communication error | High | Remove and reinstall battery; clean contacts | If code persists, battery BMS may need service |
| 21 | Bosch | Wheel speed sensor signal lost | Low | Align sensor 2–3 mm from spoke magnet; tighten magnet | If alignment doesn’t fix it |
| 30 | Bosch | Motor controller fault | High | No home fix; controller likely damaged | Immediately |
| 500 | Bosch, Yamaha | Motor temperature sensor error | Medium | Let motor cool; check wiring to motor | If code reappears regularly |
| 620 | Bosch | Battery voltage mismatch | High | Fully charge battery; try a different verified battery | If same code on another battery |
| Err 10 | Bafang | Throttle error (stuck or short) | Low | Unplug throttle; test without it | If still present, replace throttle |
| Err 12 | Bafang | Battery under-voltage | Low | Charge battery fully | If battery won’t charge |
| Err 14 | Bafang | Motor phase error | High | Check motor cable connection | If wiring is intact, motor may be faulty |
| U10 – U14 | Brose | CAN bus communication lost | High | Check display-to-controller cable; reseat connectors | If cable looks fine |
| RCV 1–5 | Yamaha | Controller-receiver handshake fail | High | Turn system off/on; check handlebar switch | If no change |
| P01–P03 | Shimano | Di2 shift system error | Low | Re-sync shifters; charge battery | If shifting still fails |
| P04 | Shimano | E-Tube app connection problem | Low | Turn off Bluetooth; restart system | If persists, update firmware via dealer |
Note: Code numbers and meanings vary by model year and firmware version. Always verify with your bike’s manual for exact interpretations.
How to Read Your Display Error Codes
E-bike error codes appear in one of three ways:
- Numeric display – A two- or three-digit number (e.g., 21) on an LCD screen.
- Letter–number combo – Such as E004, U10, or P01.
- Blinking light patterns – On basic LED displays, a sequence of long/short flashes indicates a code (check your manual for the key).
When a code first appears, note it exactly (including leading zeros). Power cycle the system (turn off, remove battery for 30 seconds, reinstall, turn on) to see if it clears a transient glitch. If the code disappears and doesn’t return during a short ride, it was likely a temporary sensor misread.
Common False-Alarm Error Codes and What They Really Mean
Some codes appear frequently due to minor issues, not real faults. Here are the top three, with a decision branch and verification step for each.
E004 / 04 (throttle or speed sensor) – with decision branch
Often triggered by a loose magnet or a speck of dirt on the sensor. Clean the area and re-check alignment. On many Bosch systems, this code clears automatically after two error-free riding cycles.
Branch: After cleaning and reseating, ride for 30 seconds. If the code disappears, you’re done. If the code reappears only when you pedal hard or hit a bump, the magnet gap is too wide – adjust the sensor closer (within 2 mm of the magnet) and re‑test. If the code appears even at a standstill, the throttle connector or wiring is the likely culprit; unplug the throttle and test without it.
Verification: Once you’ve made an adjustment, take a 1‑mile ride at moderate assist. If no code returns, the fix is confirmed. If the code reappears during that ride, move to the next step (connector inspection or throttle test).
E006 / 500 (motor temperature) – with verification
After a long climb or hot day, the motor can trigger a thermal limiter. Let it rest for 15 minutes; the code will reset on its own. If it repeats on cool days, the temperature sensor may be failing.
Verification: Before riding again, touch the motor casing with the back of your hand. If it’s cool to the touch (below ambient? no), allow 15 minutes of rest. After rest, turn the system on. If the code is gone, ride a short, flat route. Watch the display – if the code returns within 5 minutes on flat ground, the sensor is likely defective.
Err 10 (throttle short) – with branch
Some Bafang controllers interpret a momentary voltage spike as a stuck throttle. Unplug the throttle and test. If no code appears, the throttle unit is faulty and needs replacement. If the code appears with the throttle unplugged, the controller itself may have a shorted input.
Branch: Ride without the throttle for a day. If you can comfortably pedal without it, you can delay replacement. If the throttle is essential for your riding style (e.g., Class 2 throttle‑only mode), order a new throttle immediately. While waiting, the bike is safe to ride using pedal assist only.
Brand-Specific Error Code Meanings
Bosch
Bosch uses numbered codes (e.g., 21, 30, 500, 620). The most critical is 30 – motor controller fault – which requires replacement by a Bosch-certified dealer. Code 620 indicates battery voltage mismatch; try a different battery to confirm. Code 21 (speed sensor) is usually an easy fix: adjust the spoke magnet so it passes within 2–3 mm of sensor.
Practical judgment for code 21: If the magnet is correctly aligned but code 21 returns after a rainy ride, water may have splashed onto the sensor connector. Dry the connector with a cloth and apply dielectric grease before reconnecting. If the code still appears, the sensor wire may be chafed against the fork – inspect for exposed copper.
Shimano
Shimano errors are often E-prefixed (E004, E011) plus P codes for Di2. E011 means the battery and drive unit lost communication – reseat the battery firmly. P04 pops up when the E‑Tube app can’t connect; toggle Bluetooth off/on and restart.
Owner‑help detail for E011: Also check the battery dock for bent pins. If one pin is pushed down, use a small flathead screwdriver to gently pry it back level. This is a common failure on bikes that have been bumped while the battery is inserted.
Bafang
Bafang displays plain numbers like Err 10, Err 12, Err 14. Err 10 (throttle) is safe to ride without the throttle. Err 12 (battery low) means the battery is too depleted for full assist; recharge. Err 14 (motor phase) suggests a broken motor wire or controller – stop riding to avoid further damage.
Verification for Err 12: After a full charge, if the code reappears immediately, the battery may have a failed cell. Check the voltage with a multimeter at the charging port – a 36V battery should read 39–42V; a 48V battery should read 52–54V. Below those numbers, the BMS is likely cutting off early.
Yamaha
Yamaha uses RCV codes (receiver handshake errors) and numeric codes like 500 for motor temperature. RCV 1–5 often stem from a loose handlebar switch connection. Tighten the clamp or replace the switch unit.
Brose
Brose uses U codes (U10–U14) for CAN bus failures. A common fix is reseating the display-to-controller cable at both ends. If the code remains, the controller board may need replacement.
Failure‑mode detail: On Brose motors, U12 often appears after the display cable is accidentally yanked (e.g., when the bike falls over). Inspect the cable for a torn outer jacket. If the cable is intact but the code persists, the pin header on the controller side can crack – press gently on each pin with a plastic tool to confirm they are all seated.
Understanding Error Code Severity Levels
- Low – You can safely continue riding, possibly with reduced assist. Examples: speed sensor misalignment (21), battery under-voltage (Err 12), shift sync error (P01). Fix at your next stop.
- Medium – The bike may limit power or enter limp mode. Examples: motor overheat (E006), throttle fault (Err 10). Stop and troubleshoot before a long ride.
- High – The system will cut assist or prevent startup. Examples: controller fault (30), battery communication loss (E011), motor phase (Err 14). Do not ride – the issue could cause permanent damage or sudden power loss.
Practical judgment: A medium‑severity code that recurs after a few rides often escalates to high. If E006 appears twice on a cool day, schedule a motor inspection. Ignoring a medium code can lead to a controller burnout that costs $300+.
Quick Fixes You Can Do at Home
- Power cycle – Turn off the display, remove the battery for 30 seconds, reinstall, and turn on. This clears many transient sensor glitches.
- Check all connectors – Unplug and reseat the display cable, battery terminals, and motor cable. Look for bent pins, corrosion, or loose wires.
- Inspect the speed sensor – Ensure the magnet on the spoke is tight and passes within 2–3 mm of the sensor. Clean any mud or grease.
- Charge the battery fully – Many “low voltage” codes vanish after a full charge. If the battery fails to charge, test with a different charger if available.
- Update firmware – Some codes (especially on Shimano, Bosch, and Brose) are fixed by a dealer’s firmware update. If you have a diagnostic tool, follow the manufacturer’s instructions.
Verification after any quick fix: Ride a short loop (0.5–1 mile) at moderate assist and watch the display. If the code does not reappear, the fix is successful. If it returns, move to the next step in the brand‑specific section or contact support.
When to Stop Troubleshooting and Contact Support
If a high-severity code persists after the quick fixes, further home attempts can damage the system. Red flags that mean it’s time for a vet:
- Code 30 (Bosch motor controller) – No home fix; requires controller replacement.
- Err 14 (Bafang motor phase) – Likely a broken motor winding or Hall sensor; only a shop can test.
- U10–U14 (Brose CAN bus) – If reseating cables doesn’t work, the controller must be swapped.
- Any code that reappears immediately after a power cycle – Suggests a hard electrical fault.
- Smell of burning, smoke, or physical damage – Stop use and disconnect battery immediately.
Always contact your local e-bike dealer or the brand’s service center for codes that do not appear in this table or that fail to clear after a simple reset.
FAQ
How to fix error code on ebike?
Start by power cycling the system (turn off, remove battery for 30 seconds, reinstall). If the code reappears, check the specific code in the lookup table above for the likely cause and quick fix. Most throttle, sensor, and communication errors can be addressed by reseating connectors or cleaning contacts. High-severity codes like controller or motor faults require a certified mechanic.
What does E004 mean on an ebike?
E004 generally indicates a throttle or speed sensor fault on Bosch, Shimano, and Bafang systems. Check the throttle connector for looseness or damage, and clean the speed sensor magnet area. Often the code clears after a short ride once the sensor reads correctly again.
What does E11 mean on an ebike?
E011 (or E11) on Shimano systems means the battery and drive unit have lost communication. Remove the battery, inspect the contacts for dirt or corrosion, and reinstall it firmly. If the code persists, the battery BMS or drive unit may need service.
What does E006 mean on an electric bike?
E006 typically means the motor temperature is too high. Let the bike cool for at least 15 minutes before riding again. Avoid sustained steep climbs or high‑power assist on hot days. If the code returns during cool conditions, the temperature sensor or wiring may be failing.
Explore This Topic
- Back to Error Code Troubleshooting
- Back to E-Bike Resources
Related guides in this cluster:
– E-Bike Serial Number Location Guide: Where to Find It on Every Major Brand
– Hub Drive vs Mid-Drive E-Bike Motors: Complete Comparison Guide
– E-Bike Battery Compatibility Guide: Replacement Options & Cross-Brand Alternatives
– E-Bike Tire Pressure Guide: Recommended PSI by Brand, Model & Tire Size
Ryan Williams has spent over 8 years testing, repairing, and writing about electric bikes. He has personally ridden and reviewed 150+ e-bike models from brands like Lectric, Aventon, Rad Power, Super73, and dozens more.
Before founding EBIKE Delight, Ryan worked as a bicycle mechanic for 5 years at independent bike shops across California, where he specialized in e-bike conversions and electrical system diagnostics. He holds a Certificate in Electric Vehicle Technology from the Light Electric Vehicle Association (LEVA).
Ryan’s work has been cited by Electric Bike Report, Electrek, and BikeRumor. When he is not testing the latest e-bike on California backroads, he is in his workshop tearing down batteries and controllers to understand what makes them tick — and what makes them fail.
Areas of Expertise
E-bike performance testing and real-world range verificationBattery diagnostics, charging best practices, and safetyBrand comparisons: Lectric, Aventon, Rad Power, Super73, and moreError code troubleshooting across major e-bike systemsE-bike laws, registration, and compliance by state
Ryan believes every rider deserves honest, hands-on information — not marketing hype.