Is your Hiboy S2 or Hiboy S2 Pro throttle not working, stuck, or completely unresponsive? Don’t panic. We’ve got your back.
In this easy-to-follow guide, you’ll learn how to spot and fix common throttle problems fast.
Whether it’s stuck, dead, or acting weird, we’ll show you:
- What to check first (quick safety checks)
- How to troubleshoot the issue
- And exactly how to replace the throttle—step by step
Let’s get your ride back on track. Smooth. Simple. Sorted.
How to Tell If Your Hiboy S2 Pro Throttle Not Working?
Not sure what’s wrong with your throttle? Watch out for these 3 common signs your Hiboy S2 or Hiboy S2 Pro throttle isn’t working right:
- It’s stuck—either always on or always off
- Sometimes it works, sometimes it doesn’t (super annoying)
- No response at all—like it’s completely dead
If you’ve got any of these signs, don’t worry. You’re in the right place. We’ll show you how to fix it.
Quick Checks Before You Start Fixing
Before you jump into fixing your scooter, take a few easy steps to stay safe and spot simple problems:
- Turn off your scooter and unplug the battery.
- Look closely at the throttle and make sure it’s not broken or dirty.
- Check if the battery has enough charge.
- Make sure your scooter is on flat, steady ground.
These quick checks can save you time and keep things safe!
Fixing Hiboy S2 Pro Throttle Not Working: Easy Troubleshooting Steps
Follow these simple steps to find and fix the throttle problem on your Hiboy S2 or S2 Pro.
How to Fix a Stuck Throttle
If your thumb throttle is stuck and won’t move, try this:
Step 1: Replace or Adjust the Springs
Most of the time, the problem is with the small springs inside the throttle. Here’s what to do:
- Carefully open the throttle and find the springs. Notice where and how they sit.
- If they look fine, just put them back properly and add a little lubricant.
- If they’re worn out, gently remove them with pliers or tweezers. Be careful not to break anything else.
- Get the right replacement springs for your throttle. Lightly lubricate them for smooth action.
- Attach the new springs exactly where the old ones were. Make sure they’re secure.
Step 2: Lubricate the Throttle
If the cable looks okay but still sticks, spray a small amount of silicone lubricant on the throttle parts. Don’t overdo it because too much oil attracts dirt and makes things worse.
Step 3: Replace the Throttle
If nothing else works, you might need to replace the whole throttle. We’ll explain how to do that next.
Throttle Not Responding? Here’s What to Do
If your Hiboy S2/S2 Pro throttle stops working—either sometimes or all the time—don’t worry. Let’s fix it step by step.
First, Check for the E2 Error
Seeing an E2 error on the screen? That means the throttle (and its wire) needs to be replaced.
No error? Cool—let’s dig deeper.
Step 1: Look for Loose Throttle Magnets
- Open the throttle area and check for tiny magnets near the throttle body.
- If they’re out of place, gently pop them back in using non-magnetic tools.
- Can’t find them or they’re missing? Call support or a local technician.
Step 2: Check the Wires
- Look at the throttle cables. Are any wires loose or unplugged?
- Check connectors for rust or damage.
- Reconnect and clean them up if needed.
Still no luck? Keep going.
Step 3: Try Replacing the Throttle
Sometimes, a fresh throttle does the trick.
(Don’t worry—we’ll walk you through that later in the guide.)
Step 4: Inspect the Controller
- Find the controller (usually near the battery).
- Look for burnt parts, loose wires, or broken connectors.
- Repair or replace anything that looks off.
Step 5: Check the Battery
- A weak battery can cause throttle issues.
- Charge it fully and test again.
- Make sure voltage is within the normal range.
Step 6: Brake Lever Lockout
Some scooters disable the throttle if the brake is pressed. So make sure the brake lever isn’t stuck or slightly pulled in.
Step 7: Test the Motor + Wiring
- Inspect the motor wiring. Look for any signs of wear or damage.
- If needed, test the motor by connecting it directly to a battery.
- Replace any broken parts.
Step 8: Reset or Update Firmware
- Try doing a full reset of the scooter.
- Check if any firmware updates are available.
- Update it, and test again.
Replacing the Hiboy S2/S2 Pro Throttle (Fix That E2 Error!)
If your Hiboy S2 or S2 Pro scooter is showing the E2 error code, and none of the basic fixes have worked, it most likely means the throttle is faulty and needs to be replaced. This might sound technical, but the process is actually quite simple.
To fix the issue, you’ll need to purchase a replacement throttle. You can easily find one on the official Hiboy website—just make sure it’s the right match for your scooter model.
Once you have the new throttle, follow the step-by-step instructions below. These steps will guide you through the replacement process and help you get your scooter back to working condition quickly and safely.
What You’ll Need
- New Hiboy S2 Pro thumb throttle
- Phillips + flat-head screwdrivers
- Pliers
- Wire connectors (just in case)
- A little lubricant (if things feel tight)
Step-by-Step: How to Replace the Throttle
Step 1: Remove the Handgrip
Start by pulling off the handgrip on the throttle side.
Step 2: Take Off the Display
Unscrew the display from the handlebar and gently unplug it.
Step 3: Remove the Front Light
Same thing—unscrew and remove the front light to make space for the wiring.
Step 4: Loosen the Old Throttle
Find the screws holding the throttle in place. Loosen them up.
Step 5: Pull Out the Old Throttle
Carefully slide the old throttle off the handlebar. Don’t yank the wires (go easy).
Step 6: Remove the Brake Lever
Slide off the brake lever (you can leave the wires attached).
Step 7: Slide On the New Throttle
Push the new throttle into place. Line it up properly and tighten it down.
Step 8: Route the Wires Properly
Run the new throttle wires behind the light area (this is why we removed the light). Keep things tidy (no messy wires).
Step 9: Put the Brake Lever Back
Slide the brake lever back where it belongs, next to the throttle.
Step 10: Reattach the Display + Front Light
Screw the display and front light back on, and you’re done!
Conclusion
Hiboy scooters may not have the strongest build or the best durability, but that doesn’t stop you. Now that you understand how to diagnose and fix throttle issues on your Hiboy S2, you’re ready to take control and get back on the road.
Whether it’s something as simple as adjusting internal springs or replacing the entire throttle assembly, you now have a clear path to follow. This guide gave you everything you need, broken down into easy, step-by-step instructions.
Just remember, safety always comes first. Double-check your work. Make sure all the wires are secure, and every screw is tightened before you ride.
With the hard part done, all that’s left is to enjoy the ride. Your throttle’s working. The road’s calling. You’re good to go.