Debuting in 2024, embedded in all bikes after the Aventon Abound SR, the Aventon Control Unit (ACU) is the manufacturer’s proprietary smart system. Here are all the most important error codes and how to resolve them
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E28 - Low Voltage Protection - This is the simplest one to fix; this error code only means that your battery is dying or dead. Recharge your battery and see if that does the trick. Depending on which model you own, it takes anywhere between 2 and 4 hours to recharge your bike’s battery.
E29 - Overvoltage Protection - The worst-case scenario for your battery: if this persists after a full charge, the error code indicates a critical failure. Take it to your closest mechanic and have them check the battery's output voltage soon, and replace all parts they deem necessary.
E23 - Motor Phase Fault - This occurs when the motor is disconnected, or the wiring is damaged. Try reconnecting it by the rear wheel, and clean the area of any grime, soot or water.
E25 - Brake Sensor Error - The bike thinks you are squeezing the brakes. Try squeezing it completely and slowly setting it back to its default position. Check for any foreign particles within the brake levers. Sometimes, the brake cables that run between the levers and handlebars may come undone; if so, redo them.
E26 - Overheat Protection - as the name says, this error manifests when you’ve been riding too fast, or for too long. Get off the bike and let it cool down. You should be good to go in about 10 minutes.
E27 - Motor Lock/ Protection Mode - Something may be imopedeing the rear wheel. Turn the bike off, and ensure the rear wheel spins freely by hand. If it doesn’t, try to find out why it may be blocked. If that doesn’t work, take it in for service.
E30 - Mid-drive Controller Error - This error usually indicates the controller cannot communicate with the motor, resulting in uneven, choppy, or sometimes no power delivery. It usually means there is a loose wire or connector between the two, and cleaning the area and fastening the connections is the quickest solution.
E31 - Mid-drive Battery Error - Similar to E30, this is also a communication error. Except, in this case, the battery cannot communicate with the mid-drive. If there is any visible disfigurement or damage, take it to a service centre for repair. Alternatively, you can disconnect, clean, and reconnect the battery to the motor and the battery from its socket (if it's removable)
E32 - Mid-Drive Display Error - The third of its kind, this error occurs when the display cannot communicate with the motor. While this may not be a major problem since the bike runs smoothly, it still needs to be addressed quickly. It usually means that one or more components, like the display, its cable, the battery, its socket, or the connectors, are damaged.
E33 - Mid Drive ACU Error - Similar to the other 3, this occurs when the motor cannot communicate with the control unit. This error could be due to a buggy software version that needs to be addressed in-store, or a loose connection, so check all fastenings twice before you take it in. Occasionally, a rainy, windy, or trail-heavy ride can cause enough vibrations to dislodge such fittings.
E45 - Speed Sensor Failure - This error can cause faulty and inaccurate speed readings, which can put you in a very precarious position on the road, especially with the law. However, it can occasionally be because of outdated or buggy firmware, so try updating the bike’s firmware in the Aventon app before you take it in for service.
E176 - Exceeded Allowable Area - If you set up allowable areas or a geofence in-app, it can occasionally become inaccurate and deactivate the bike within the allowed zone. When this happens, your best bet is to troubleshoot through Aventon’s app. Temporarily deactivate it to get where you need to go, or override it manually in-app altogether.
Error codes E34, E40, E41, and E42, along with hundreds more, are components that need to be taken apart and checked because they are fully integrated into the bike’s frame. Do not try to take apart your bike, as this will void the warranty, and you’ll end up bearing costs you don’t have to save a few hours at a service centre, or worse, cause more damage.
For any of those codes, don’t try to toy with the sensitive electronic components in an e-bike; they can be dangerous.
We hope this guide helps. If you liked it, we’ve got other guides on everything e-bikes – from fashion to cameras to watches to bikes themselves – check those out, too!
Happy Riding!