Resetting 18E and 20E Errors on OKAI Scooters
If an OKAI scooter is showing a 18E ("throttle not returning") or 20E ("right brake lever not returned") error on its handlebar display, the cause is almost always something the operator can resolve on the spot in under a minute. This article walks through the field reset procedure, and explains what to do when it doesn't work.
Why does this happen?
The OKAI ECU runs a safety check at each unlock that confirms the throttle and brake levers are sitting in their neutral resting position. If either control is even slightly displaced — from a knock, a fall, debris, or just a bit of grit in the housing — the ECU refuses to engage and shows 18E (throttle) or 20E (right brake lever) on the display until the control returns to true zero.
On-site reset procedure
This is the same procedure for both 18E and 20E. The control name changes; the steps don't.
1. Identify which control is flagged
- 18E → throttle (the twist grip or thumb throttle on the right handlebar)
- 20E → right brake lever
2. Work the affected control through its full range
With the scooter on its kickstand:
- For 18E, press the throttle in repeatedly — squeeze it to full, release fully, then repeat about 10 times. End with the throttle fully released.
- For 20E, squeeze the right brake lever fully, release, repeat about 10 times. End with the lever fully released to the resting position.
The goal is to physically work any debris loose and confirm the control springs all the way back to zero. Make sure nothing is mechanically blocking it from returning to rest.
3. Power-cycle the scooter
Lock the scooter (through the Levy Fleets dashboard, mobile app, or by long-pressing the power button if the unit supports it), wait about 5 seconds, then unlock it again.
4. Check the display
When the scooter wakes from the lock cycle:
- If the 18E / 20E code is gone → the scooter is good. Return it to service.
- If the code is still there → continue to the next section.
5. Confirm the dashboard is in sync
Open the vehicle in your Levy Fleets dashboard and check the Status & telemetry section on the vehicle detail page. If the error has cleared on the scooter display but the dashboard still shows it, give it a minute — telemetry can lag the device by 30–60 seconds. If the dashboard still shows it after a couple of minutes, that's a sign of the display-communication issue covered below.
If the error doesn't clear after the reset
When the on-site reset doesn't fix it, the cause is one of two things:
Case A — the control is physically damaged
The throttle or brake-lever assembly itself is faulty (worn spring, bent body, internal sensor failure). This requires a hardware replacement — order a replacement assembly from Levy support and swap it.
How to tell: the error code persists and the affected control feels stuck, mushy, or doesn't fully spring back when you take your hand off it.
Case B — the display is reporting a phantom error
In some units, the display (instrument cluster) loses sync with the ECU and keeps reporting an old error that has actually cleared on the controller side. The control works perfectly and the scooter rides normally — the display is just stuck on the wrong reading.
How to tell: the error code persists on the display, but the throttle and brake both feel normal, and the scooter can be unlocked and ridden at full speed without issue.
What to do in Case B
Contact Levy support and let us know the vehicle number(s) showing this behavior. We'll coordinate a remote display firmware update with OKAI — no on-site work required from your end. The fix takes a few minutes and clears the display permanently.
Quick reference
| Display code | What it means | First step |
|---|---|---|
| 18E | Throttle not returning to zero | Work the throttle through its full range, then lock/unlock |
| 20E | Right brake lever not returning | Squeeze and release the right brake lever fully, then lock/unlock |
| If reset works | If reset fails (hardware) | If reset fails (display) |
|---|---|---|
| Return to service | Replace the control assembly | Contact Levy support — we'll push a display firmware update remotely |
Related articles
- Vehicle Error Codes Reference — full list of OKAI error codes with severity levels
- IoT Device Troubleshooting — broader diagnostics if the scooter isn't responding at all
- Vehicle Detail Page — where to read the live error status in the dashboard