Fatbike Malfunction? Check your error code here (V20, OUXI V8 & ENGWE)
, by TJB Trading, 7 min reading time
Geen ondersteuning, 0 km/u of een E-code op je fatbike-display? Check eerst deze praktische controles en foutcodetabellen voor V20, OUXI V8 en ENGWE.
Are you getting an E-code on your display or is your fatbike suddenly acting up? Such as: no assist, throttle not working, 0 km/h on your screen, or a bike that cuts out when accelerating. Then you're not alone.
At TopTier Parts, we are experts in the technical field. We like to keep it simple: we make it easy for you with a clear list of fatbike error codes for the V20, OUXI V8 and ENGWE, plus the most common causes we see in practice. This way, you'll quickly know if it's a minor issue (connector/brake contact) or if something truly needs replacing.
The most common fatbike problems (that we see most often)
These are the complaints that come in most frequently:
Fatbike doesn't accelerate / no assist
Often this is a brake contact (the bike "thinks" you are braking), or a pedal sensor (pedal assist) that isn't sending a signal.
Throttle does nothing or works intermittently
Usually: throttle error code, cable/connector, or the throttle is not properly connected.
Display works, but motor remains dead
In this case, you're often looking at motor ↔ controller communication or a controller error.
Speed remains 0 km/h
9 out of 10 times it's the speed sensor/magnet (distance/alignment).
Battery seems full, but suddenly drops/cuts out
Can be caused by BMS/battery communication or voltage dropping under load.
Motor hums but doesn't engage
This often indicates a motor phase or hall sensor issue (ENGWE often shows this as a separate error).
Quick checks before ordering parts (saves you a lot of hassle)
Honestly: many "malfunctions" are just loose connectors or moisture.
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Battery off/on (mini-reset)
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Check all connectors (display, controller, motor, pedal sensor/assist) – firmly seated, no play
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Check brake levers: is one stuck? (brake contact remains “on”)
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Speed sensor + magnet: usually, they need to pass 2–5 mm apart
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Got wet? Let connectors dry and check for moisture/oxidation
Error codes per model: V20, OUXI V8 and ENGWE
OUXI V8 – all codes
OUXI V8 “old type” display/controller (E0 to E13)
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E0 – Normal operating status
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E01 – Reserve
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E02 – Braking system fault
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E03 – Pedal sensor / pedal assist fault
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E04 – 6 km/h “cruise/walk assist”
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E05 – Low voltage protection (setting/voltage)
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E06 – Low battery voltage
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E07 – Motor fault
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E08 – Throttle fault
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E09 – Controller fault
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E10 – Communication receive fault
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E11 – Communication transmit fault
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E12 – BMS/battery communication fault
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E13 – (Large) headlight/front light fault
OUXI V8 display 2.0 (V8 2.0–3.0 / H9) – codes shown by this display
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E01 – No connection motor ↔ controller
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E02 – Throttle fault
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E03 – Controller fault
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E04 – Brake (contact)/brake cable fault
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E05 – Voltage protection / voltage setting
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E06 – Display receives no data (communication)
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E07 – Controller receives no data (communication)
Note: E08–E13 are usually seen on the old type display, not on all “2.0” displays.
QMWheels / Fatbike V20 PRO – all codes (as common in NL)
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E00 – General system fault
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E01 – Communication fault motor ↔ controller
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E02 – Speed sensor fault
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E03 – Pedal sensor / pedal assist fault
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E04 – Motor overload / short circuit
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E05 – Speed sensor fault
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E06 – Pedal assist malfunction
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E08 – Motor/controller overheating
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E10 – Display fault
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E11 – Throttle fault
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E12 – Motor or controller short circuit
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E13 – Battery voltage too low
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E14 – Battery communication fault
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E15 – Controller fault
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E16 – Motor/controller overheating
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E17 – Motor protection fault
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E18 – Motor phase/motor winding problem
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E19 – Battery/BMS communication fault
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E20 – Throttle fault (check setting P06)
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E40 – Motor fault or motor controller problem
ENGWE – all codes (depending on display/protocol)
ENGWE uses multiple displays; therefore, there are 2 common “sets” of error codes:
Set 1: E001 to E006 (often seen on YL-01/YL-02-like protocols)
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E001 – Controller failure
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E002 – Communication failure
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E003 – Hall failure (hall sensor in motor)
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E004 – Throttle failure
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E005 – Brake failure (brake contact)
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E006 – Motor phase failure
Set 2: E021 to E025 + E030 (often seen on YL-05 / KDS / YL-J-like protocols)
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E021 – Current failure (current deviation)
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E022 – Throttle failure
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E023 – Motor phase failure
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E024 – Hall failure (hall sensor)
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E025 – Brake failure (brake contact)
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E030 – Communication failure (display ↔ controller)