NIU KQi scooter troubleshooting: dark dashboard, charging, brakes and error codes

This page covers common problems on NIU KQi electric kick scooters, such as the KQi1, KQi2, KQi3, KQi 100, KQi 300 and KQi Air. NIU's help center has short guides for many symptoms and error codes. Steps and codes can differ by model, so check your own manual too.

Before you start

• Get your manual from the NIU download center, which lists user manuals for the KQi 100, KQi 300 and KQi Air series.
• NIU's contact page links its help center, which covers FAQs, error codes and troubleshooting. The KQi troubleshooting folder is a good place to browse.
• In North America, service requests, warranty claims and parts go through the NIU after-sales platform.

Common problems and what to check

Dashboard stays dark or scooter won't turn on

• Check whether the power button has shifted or stuck. If it has, move it back into place and try again (dashboard guide).
• Charge the scooter.
• NIU says a scooter that won't turn on often has one of two cables in the stem unplugged, and its won't turn on guide shows where they are. If you can't see them without taking parts off, use NIU's online form instead.

See won't turn on and display blank or flickering.

Throttle does nothing

• A new scooter has to be activated before it will ride. NIU's throttle guide links the activation steps.
• If it is already activated and still won't ride, contact NIU after-sales.
• If E-Save is flashing, NIU says the scooter is in custom mode, usually because a top speed was set in the NIU app. Turn custom mode off in the app (E-Save guide).

Won't charge

• Make sure the charging port is clean (charging guide).
• Plug the charger into the wall without connecting it to the scooter. NIU says a green light is normal, and a red or unlit light suggests the charger is damaged and needs after-sales service.
• NIU's FAQ says charging works between 0 and 45°C, you don't need to run the battery down before charging, and the battery is rated for about 500 cycles.

See battery won't charge and check your charger.

Brakes weak or not stopping

• Hold one brake and try to push the scooter forward. If it moves easily, the brake is not gripping (brake guide).
• Adjust the tension by changing where the brake cable is clamped, as NIU describes.
• On the KQi2, the front drum brake is tightened by loosening the cable fixing screws, raising the rocker arm and retightening the screws. Electronic brake strength can be set in the app (KQi2 brake guide).
• If the brakes still fail, NIU says the electronic brakes are likely at fault and need professional repair.

See brakes.

Tire pressure, wobble and bounce

• NIU's FAQ gives 45 to 50 psi (3.10 to 3.44 bar) and suggests checking it monthly.
• If a wheel wobbles or bounces, the FAQ says to tighten the front and rear wheel nuts.

See set tire pressure and fixing a flat.

Stem wobble

• Check that the folding latch is properly closed, then make sure the stem screws and the screws between the gooseneck and stem are tight (stem guide).
• NIU's FAQ rates the fold for about 3,000 folds and says to make sure the latch is fully secured.

Rain

NIU's FAQ says the scooters are rated IP54, light rain is fine, and you should keep the deck dry because the battery is there. See e-bike got wet.

Error codes

When a code shows, NIU says to look it up in the troubleshooting chapter of your manual and follow the steps, or contact after-sales (error code guide). NIU's help center explains these:

• 02: brake fault. Check that the wiring from the left and right brake levers is plugged in firmly (error 02).
• 03: accelerator fault. Check that the thumb throttle wiring is plugged in firmly (error 03).
• 41: battery over-discharge warning, often after weeks or months without charging. Charge it right away (error 41).
• 42: battery communication and verification fault. Contact NIU if it keeps showing (error 42).
• Red dot on the dashboard: NIU says to send the scooter for a check (red dot guide).

More on error codes.

Videos

Official help

The NIU support page links manuals, the FAQ, warranty and after-sales service, and gives NIU's KQi support phone line. For general upkeep, see e-scooter maintenance.

When to get a pro

• Electronic brake problems, which NIU says need professional repair.
• Battery codes like 42 that keep coming back, or a red dot on the dashboard.
• A charger that shows red or no light.
• Anything that means opening the deck or stem.

Sources

• Contact NIU, NIU
• NIU FAQ, NIU
• NIU support, NIU
• NIU download center, NIU
• NIU after-sales service platform, NIU
• KQi troubleshooting folder, NIU help center
• What to do when an error code is showing, NIU help center
• What to do if the battery doesn't charge, NIU help center
• How to fix a kick scooter that won't turn on, NIU help center
• What to do if the dashboard doesn't light up, NIU help center
• Scooter doesn't ride after pressing the throttle, NIU help center
• What to do if the brakes fail, NIU help center
• How to adjust KQi2 brake tightness, NIU help center
• How to fix error 02, NIU help center
• How to fix error 03, NIU help center
• How to fix error 41, NIU help center
• How to fix error 42, NIU help center
• Red dot on the KQi dashboard, NIU help center
• E-Save flashing on the dashboard, NIU help center
• Handlebar stem wobbles during a ride, NIU help center

Stuck after these checks? Find a shop near you.