Due to COVID-19, call volumes are very high and there is no guarantee you will be connected. You can find a lot of great information here on our Help Center, but if you can’t find what you’re looking for we recommend sending us an email and we will respond as soon as we can.

RadCity Error 30 Troubleshooting Guide

To troubleshoot an error 30 message on a RadCity, perform a connector check to ensure all connectors are secure and in good condition.

This guide uses a 2017 RadCity but the steps will be the same for most RadCity models.

Tools Needed:

  • Flat side cutters
  • Flat head screwdriver
  • A camera
  • Zip ties 

Connector Check Steps:

  1. Get the bike ready for maintenance. Turn off the bike, remove the battery, and press MODE to discharge remaining power.

  2. Check the battery and battery mounting tray terminal contacts. If it's in good condition, reinstall the battery and turn on the bike to check if the issue is resolved. If the bike will not turn on, remove the battery and discharge remaining power.

  3. Check the connection between the battery and the controller. The battery connector is the large connector located near the bottom bracket. The connector is flat on one side and is black inside with two large prongs. Follow the steps below to check the connector.

    sZERo6Q_xKCTa6_II8H7p_g.png   IMG_2427__2_.jpg

    Perform the following steps on one connector at a time until the error message is resolved:

  4. Locate and unplug the connector. Follow the cable from the part to the connector. Snip zip ties for easier access, then pull each side of the connector directly apart without twisting.

  5. Inspect the inside and reconnect. If the inside of the connector is wet, dirty, or damaged, take a photo and contact Product Support. If it looks normal, line up the internal notch and pins (and external indicators) and press directly together without twisting.

  6. Check if the issue is resolved. Reinstall the battery and turn on the bike. If the issue continues, turn off the bike, remove the battery, and discharge remaining power.

  7. Repeat steps 4 through 6 on each connector listed below until the error is resolved. Once resolved, replace zip ties and trim to be flush and smooth. Test the bike fully and ride Rad!

Click the headings below to complete the connector check.

Display Connector
Location: Handlebar area

Color: Black inside

Untwist the metal portion of the connector, then pull directly apart without twisting. To reconnect, align the internal notch and pins, and twist the metal portions until the connector is secure.


Wiring Harness Connector
Location: Near seat tube

Color: Black inside


To access the connector:

  1. Turn the handlebar to the side to create cable slack.
  2. Feed the wiring harness cable into the top of the downtube.
  3. Remove the rubber grommet from the lower cable opening. At the bottom of the downtube, use a flat head screwdriver to carefully unseat the rubber grommet.

  4. Access and inspect the connector. Gently pull out the wiring harness connector while feeding more cable into the top of the downtube. Once the connector is out of the downtube, unplug it, inspect the inside, and reconnect.

  5. Insert the connector into the downtube. Carefully push the connector back into the downtube and reinstall the grommet.
  6. Reinstall the battery and check if the issue is resolved.
Motor Connector
Location: Near the chainstay, on the left side of the bike

Color: Black inside


Taillight Connector (For Bikes 2019 and Later Only)
Location: Back of the bike

Color: Blue inside

IMG_2728.jpg  IMG_2750.JPG

Second Taillight Connector (For Bikes 2019 and Later Only)
Location: Near the seatstay

Color: Blue inside

This connector only exists on bikes that have a rear rack installed. Trace the cable from the first taillight connector to the connector plugged into the controller.

Brake Connectors
Location: Handlebar - left and right side

Color: Red inside

Check one brake connector, then test the bike to see if the issue is resolved. If not, check the other brake connector.

Brake_connector_close_up.jpg   Brake_connector_2_unplug.jpg

Throttle Connector
Location: Handlebar area

Color: Yellow inside


Headlight Connector
Location: Front of the bike

Color: Red inside


Pedal Assist (PAS) Sensor Connector
Location: Near the bottom bracket

Color: Yellow inside

IMG_2426__1_.jpg  IMG_2724.jpg  

Caution.png If you are not confident in your ability to safely and successfully perform all steps, we recommend having the work performed or checked by a local, certified, and reputable bike mechanic.


Need more assistance?  Submit a request