Electric bikes (eBikes) have transformed how we commute, discover, and exercise. They are efficient, environmentally friendly, and just plain fun. However, just like any machine with moving parts and a lot of electronics, eBikes require you to provide routine maintenance on them, and that you will need to carry out some repairs from time to time. Whether you are an everyday commuter or a weekend rider, being aware of the most common eBike problems will save you time, money and headaches.
In this comprehensive guide, we’ll break down the 10 most frequent eBike problems, their symptoms, causes, and step-by-step fixes. We’ll also cover essential tools, preventative maintenance tips, and when to call in a professional. Let’s dive in!
1. Battery Not Charging or Holding Charge
Symptoms:
Battery fails to charge fully.
Charger light stays green or blinks.
Drastic reduction in riding range.
Causes:
Age or overuse (typical lifespan: 500–1,000 charge cycles).
Corroded, dirty, or loose connectors.
Faulty charger or Battery Management System (BMS) failure.
Solutions:
Inspect and clean all battery terminals and connectors.
Test with a different charger if available.
Reset the battery (if supported by your model).
Replace swollen or aging batteries (older than 3 years).
Pro Tip: Store and charge batteries at room temperature to maximize lifespan.
2. Motor Not Engaging or Power Cutting Out
Symptoms:
Pedals work, but motor assistance is absent.
Motor stutters or disengages mid-ride.
Causes:
Loose motor cable connections.
Faulty controller or throttle sensor.
Overheating (common during steep climbs or heavy loads).
Solutions:
Reconnect motor wires and inspect for damage.
Check the display for error codes and let the motor cool.
Replace the controller or seek professional help if issues persist.
3. Error Codes on the Display
Symptoms:
Codes like E05, E07, or E10 appear on the screen.
Bike malfunctions or shuts down.
Causes:
Sensor malfunctions (speed, torque, pedal assist).
Electrical shorts or firmware glitches.
Solutions:
Consult your eBike manual for code definitions.
Restart the system or update firmware (if available).
Tighten sensor connections and check wiring.
Note: Error codes vary by brand (e.g., Bosch, Shimano Steps). Always refer to your manual first.
4. Pedal Assist System (PAS) Failure
Symptoms:
No motor assistance when pedaling.
Delayed or inconsistent power delivery.
Causes:
Misaligned or damaged PAS sensor.
Dirty magnet ring or software errors.
Solutions:
Clean debris around the PAS sensor and magnet ring.
Realign or replace the sensor.
Reboot the system or run diagnostics via the display.
5. Unresponsive Throttle
Symptoms:
Throttle doesn’t activate the motor.
Intermittent or jerky response.
Causes:
Loose wiring or damaged throttle.
Controller malfunction.
Solutions:
Inspect throttle connections and replace if cracked.
Reset the controller or replace it for under $50 (a DIY-friendly fix).
6. Squeaky or Weak Brakes
Symptoms:
Loud squealing or grinding noises.
Reduced braking power.
Causes:
Contaminated brake pads/rotors (oil, dirt, water).
Worn pads or misaligned calipers.
Solutions:
Clean rotors with isopropyl alcohol.
Replace worn pads and realign calipers.
Bleed hydraulic brakes if sponginess persists.
7. Electrical Shorts or Burnt Smells
Symptoms:
Sudden power loss or burnt plastic odor.
Visible wire damage.
Causes:
Pinched cables, water damage, or overloaded controllers.
Solutions:
Inspect and replace frayed wires immediately.
Dry components after water exposure.
Stop riding and consult a technician if the controller is damaged.
Warning: Electrical shorts can cause fires—never ignore this issue!
8. Flat or Worn Tires
Symptoms:
Frequent punctures or unstable rides.
Cracked sidewalls or bald treads.
Causes:
Underinflation, sharp debris, or aging tires.
Solutions:
Patch tubes with a repair kit or replace them.
Maintain tire pressure (check PSI weekly).
Upgrade to puncture-resistant tires for eBikes.
9. Loose Spokes or Wobbly Wheels
Symptoms:
Clicking sounds or rim rubbing against brakes.
Uneven riding experience.
Causes:
Impact damage from rough terrain.
Poorly tensioned spokes.
Solutions:
Tighten spokes with a spoke wrench.
Use a truing stand for alignment or visit a bike shop.
10. Chain Slippage or Drivetrain Issues
Symptoms:
Chain skips gears or derails.
Grinding noises during shifting.
Causes:
Stretched chain, dirty drivetrain, or bent derailleur.
Solutions:
Clean and lubricate the chain monthly.
Adjust derailleur limits or replace worn components.
Essential Tools for DIY eBike Repairs
Equip your toolkit with:
Allen wrenches (4mm–8mm).
Tire levers, mini pump, and puncture kit.
Multimeter for electrical diagnostics.
Torque wrench and chain lubricant.
Brand-specific diagnostic tools (e.g., Bosch Diagnostic Software).
When to Call a Professional
While many fixes are DIY-friendly, seek expert help for:
Electrical fires or controller failures.
Battery/motor damage (e.g., swelling, burns).
Frame cracks or complex hydraulic brake issues.
Preventative Maintenance: Keep Your eBike Running Smoothly
Taking proper care of your eBike will prolong its lifespan and allow it to perform to its maximum capabilities.
Monthly Checks: Check brake pads for wear and test to make sure tire pressure is at the correct PSI level (found on the sidewall). Also check the chain, to ensure it's not rusty or stretched.
Clean Often: Moisten a cloth and wipe down the frame: pat dry. Degrease the chain and cassette with your mechanical bike cleaner and relubricate the chain to prevent friction.
Take Software Updates: Connect your display to the relevant manufacturer apps to take any firmware updates to correct defects or to enhance the performance of the motor.
Proper Storage: If you have an eBike, store it inside, avoiding direct sunlight, moisture, and freezing. If you are going to be storing the bike long term, use a charge of between 50-60% (ideally pull the battery out of the bike as well).
Final Thoughts
Understanding basic repair techniques for your eBike allows you to deal with most situations easily. But, take care, know your limits, and if you do not feel comfortable completing a repair then consult your local bike shop. By using DIY repair skills and preventative care, you can extend the longevity of your eBike and enjoy a more trouble-free ride for years going forward.
At Sizzlebk, our electric bikes all have a one-year warranty, to avoid trouble and mistakes, come and buy!
