Throttle behaviour on a KT LCD3 / LCD5 / LCD8: P4 and C4 explained

KT controllers drive the throttle directly; the display sets two things: whether it works from standstill (P4) and how it is limited (C4).

Step by step

1. Switch the display on. Within a few seconds, press and hold ▲ and ▼ together for about 2 seconds: the General Settings screen appears with the maximum speed flashing. From the General Settings screen, hold ▲ and ▼ together again for 2 seconds to reach the P parameters (P1–P5); a third hold reaches the C parameters (C1–C14). Power (short press) steps to the next parameter; ▲ / ▼ change the value; holding ▲ and ▼ again saves and exits.
2. P4 = 0: throttle works from standstill. P4 = 1: throttle only after the pedals turn (EU-friendly 'assist-only' feel).
3. C4 = 0: throttle up to the max speed, always. C4 = 1: throttle limited to 6 km/h (walk speed) — the EU-legal setting. C4 = 2: throttle ignores assist level and gives full power. C4 = 3: throttle only in level 1–5, not level 0. C4 = 4: throttle capped at the current assist level's speed. (Values differ slightly by firmware; the display shows the range.)
4. Hold ▲ and ▼ to save. Test on a quiet road.
5. To physically disable the throttle, unplug its 3-pin connector; the controller runs without it.

Can't find it?

Throttle dead: level 0 with C4 = 3, a brake sensor stuck, or the throttle Hall sensor gone (error 04 on many KT firmware). Throttle full-on at power-up (motor runs by itself): throttle wire shorted or water in the throttle; unplug it immediately.

Frequently asked

Other KT LCD3 / LCD5 / LCD8 (Kunteng controllers) guides