Troubleshooting

Complete guide to Surface 604 error codes: Error 05, 06, 07, 08, 09, 12, 25, and 30 — with real-world symptoms, step-by-step troubleshooting, affected bikes, and replacement part links.

The #1 most common issue: throttle works fine but pedal assist does nothing. Step-by-step diagnosis from brake inhibitors to torque sensor replacement.

If your speedometer is not providing a clear and accurate reading of your speed, there is a likely a magnet inside the motor casing that has fallen out of place. The fluctuating speedometer could be accompanied with a rattling sounds stemming from th

During the lifespan of your bike, nuts and bolts will loosen themselves, your shifter cable and chain will stretch, and the spokes will soften. All things you won't need to worry about if you service your bike once or twice a year depending on how of

Your pedal assist may be intermittent after changing a flat. The reasoning behind this is that there is a specific washer layout that you need to have on your rear axle in order for the torque sensor to output the correct signal to the controller and

Bike works fine on flat ground but dies on hills, or power cuts out randomly and comes back after restart. Usually a battery issue.

If your headlight is lighting up when you press on the brakes, it is likely that the headlight is wired to the tail light and vice versa. To resolve this, you will need to switch the two connections which are illustrated in image 1 below. Image 1: Re

Pedal assist stopped working after changing a flat tire. Common issue — the torque sensor cable likely got disconnected during wheel removal.

Display is completely blank and nothing happens when you press the power button. Step-by-step diagnosis from battery to controller.

Mid-drive bike creaks or squeaks under pedal load, especially uphill. Almost always a tightening issue — not a defect.

This video will help you troubleshoot your pedal assist system. This typically yields results if your PAS seems to fluctuate in and out of assist and if the throttle works fine.Remember to remove the battery before disconnecting the torque sensor wir

All 2020+ Surface 604 come standard with thermal protection software. The bike will power down when the temperature threshold limit is met in order to protect the electronics from suffering damage due to excessive heat produced by the motor. In nearl

If your speedometer is not providing an accurate reading of your speed, we recommend visiting your local Surface 604 dealer. If you'd rather tackle the repair yourself, please see our Fluctuating Speedometer Fix.

Motor makes grinding, clicking, or rattling noise under load. How to diagnose bearing failure vs. connector damage.