King-Meter error 06: Battery undervoltage protection triggered
The display has detected that the battery voltage has dropped below the safe operating threshold set by the controller. Motor assistance is cut off and the walk-assist mode is disabled until voltage recovers. The system protects the cells from deep discharge, which would otherwise shorten their service life.
| Drive system | King-Meter K5242 / KM5S LCD display |
| Severity | Fix at home |
| Keep riding? | Do not keep riding |
| Typical cost | Expect roughly 30 to 60 EUR for a workshop diagnostic, 40 to 100 EUR for a replacement charger, 80 to 180 EUR for a controller fitted, and 250 to 650 EUR for a new battery pack depending on capacity. |
Likely causes
- Battery is flat or nearly flat and simply needs charging
- Cold weather has reduced the usable capacity and the pack sags under load
- Loose, dirty, or corroded connector between the battery and the controller
- Battery management board tripping early because of age or cell imbalance
- Charger is faulty or under-spec and is not actually refilling the pack
- One or more cells inside the pack have failed, dragging the whole voltage down
How to fix King-Meter error 06
- Switch the system off and remove the battery key if the bike has one.
- Read the state of charge from the display or the LEDs on the battery housing.
- Connect the original charger and run a full charge cycle until the indicator turns green; do not interrupt it.
- Pull the battery and inspect the mounting rail, contacts, and connector pins for dirt, green corrosion, or bent pins, cleaning with a dry cloth if needed.
- Refit the battery, switch the bike on, and check whether code 06 still appears on the K5242 or KM5S screen.
- If the warning returns on a fully charged pack, stop using the bike and take it to a dealer for a pack voltage test.
Warranty: A genuine battery or controller fault inside the two-year warranty window is normally covered, while capacity loss from age, deep discharge, water ingress, or crash damage is treated as wear and excluded.
Typical cost: Expect roughly 30 to 60 EUR for a workshop diagnostic, 40 to 100 EUR for a replacement charger, 80 to 180 EUR for a controller fitted, and 250 to 650 EUR for a new battery pack depending on capacity.
Frequently asked
Can I reset king-meter error 06?
You can clear it by switching the display off, charging the battery to full, and then powering the system back on. If the pack voltage is genuinely too low, the code will return as soon as the load picks up again.
Is it safe to keep riding with error 06 showing?
No, the assist has been cut to protect the battery from deep discharge and riding a loaded e-bike without power in traffic is unsafe. Charge the pack first and confirm the code has cleared before riding again.
How much will it cost to fix king-meter code 06?
If a charge solves the problem the only cost is electricity; a failed charger is 40 to 100 EUR. The common paid outcome is a worn battery pack, typically 250 to 650 EUR fitted, and that is usually covered by warranty if the pack is under two years old.
Related King-Meter codes
Official source: King-Meter K5242 LCD manual, appendix 1 Error Code Definition
Not an official King-Meter document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.