Rad Power Bikes RadWagon 4: error 30 on the display

Your RadWagon 4 shows error 30 and the motor won't help. Rad's RadWagon error 30 guide is written around a 2019 RadWagon and says the steps are similar for other years, so it is the guide to use on the RadWagon 4. The short answer: a connector is loose, dirty or damaged, or one part plugged into the system has failed. Reseat the main plugs first, then unplug the others one at a time to find it.

Most likely cause

Rad's guide treats error 30 as a connection problem and has you confirm every connector is secure and in good condition (Rad RadWagon guide). Rad describes the same code as a communication error on its LCD display bikes (RadCity guide).

Other causes to rule out

• Dirty or damaged battery or mounting tray contacts, which Rad checks before any plug. (Rad guide)
• A failed motor, light, brake sensor, throttle or PAS sensor. Rad's second group of checks is an unplug test for exactly these parts. (Rad guide)
• A bike that won't power on at all. Rad's won't turn on guide for external battery bikes mentions some RadWagon models.

How to confirm

1. Turn the bike off, remove the battery and press MODE to drain leftover power, as Rad says.
2. Check the battery and mounting tray contacts. If they look fine, refit the battery and test.
3. Group one, reconnect and test each: the battery connector near the bottom bracket (large, flat on one side, two big prongs), the handlebar connector (untwist the metal part first, twist it back to lock), and the seat tube connector.
4. Group two, test with each one unplugged: the left chainstay connector, the seat stay connector, the rear connector, the left and right handlebar connectors, the yellow handlebar connector, the front connector and the yellow seat tube connector. Rad's guide says this group covers the motor, headlight, taillight, brakes, throttle and pedal assist.
5. If the code clears with one unplugged, that part may need replacing. Note it and contact Rad.
6. Photograph anything wet, dirty or damaged.

Fix options

Reseat the connectors (easy)

Snip zip ties with flat side cutters, pull each plug straight apart without twisting, line up the notch and pins, press together, and replace zip ties trimmed flush.

Replace the part the isolation test points to (moderate, through Rad support)

Brake sensors, the throttle, lights and the PAS sensor plug in. Get the correct part for your bike through Rad Product Support. Never ride with a brake sensor unplugged, since it cuts motor power when you brake.

Replace the harness, display or controller (pro)

If every plug is clean and nothing clears the code, leave testing the harness, display and controller to a shop or Rad support.

Parts

• Zip ties
• E-bike connectors
• Main cable (wiring harness)
• E-bike display
• Throttle, Brake cutoff sensor or Pedal assist sensor, only the one the test points to
• E-bike controller (pro only)

When to get a pro

Get help for water or corrosion in a plug, bent pins, a pinched cable near the rear rack, or a code that stays after the full check. If you also have tire trouble on this bike, see RadWagon 4 tire keeps going flat. More help: Rad Power Bikes error codes and when to call a pro.

Sources

• RadWagon error 30 guide, support.radpowerbikes.com
• RadCity guide, support.radpowerbikes.com
• won't turn on guide for external battery bikes, support.radpowerbikes.com

Stuck after these checks? Find a shop near you.