Bafang error codes

The display shows the fault as a two-character code, blinking on some models, and several displays store the last ten faults. What a code means depends on the display model: CAN displays and older UART displays partly use different numbers.

Trolda cannot read Bafang motors yet. The code list is here to help you anyway.

CAN displays (2019–2022)

Code	Part	What it means
04	Throttle	Throttle fault, or the throttle isn’t back at zero (Bafang’s sources disagree)
05	Throttle	Throttle fault, or the throttle isn’t back at zero (Bafang’s sources disagree)
09	Motor	Fault in the motor windings (phases), so the motor stops
11	Motor	The motor’s temperature sensor is faulty
14	Temperature	The controller (the motor’s electronics) is too hot and cuts out
15	Motor	The controller’s temperature sensor is faulty
27	Motor	Current in the controller is too high
33	Brake	The brake switch signal is wrong (only bikes with brake switches)
35	Motor	An internal 15 V circuit in the controller is failing
36	Display	Fault in the button circuit, often because the power button is held at start-up
37	Motor	The controller’s safety circuit (watchdog) is failing
38	Sensor	The sensor’s safety circuit is failing
41	Battery	The battery voltage is too high
42	Battery	The battery voltage is too low
43	Battery	The battery cells are delivering too much power
44	Battery	A single battery cell has too high a voltage
45	Battery	The battery is too hot
46	Battery	The battery is too cold
47	Battery	The battery management system (BMS) reports too high a charge level
48	Battery	The battery management system (BMS) reports too low a charge level
49	Battery	A single battery cell drops too low in voltage during use (batteries with smart BMS)
4C	Battery	Too big a voltage difference between the battery cells (batteries with smart BMS)
61	Gears	The electronic shifter isn’t registering the gear change
62	Gears	The electronic rear derailleur won’t release
71	Lock	The electronic lock is stuck
81	Display	The display’s Bluetooth module is failing

Older UART display (DP C18.UART)

Code	Part	What it means
03	Brake	The brake switch reports the brake is on, so the motor won’t assist
22	Communication	Communication with the battery management system (BMS) is failing

Code	Part	What it means
07	Battery	Voltage in the system is too high, so the motor stops
08	Motor	Wrong signal from the motor’s position sensor (Hall sensor)
10	Temperature	The motor is too hot and cuts out
12	Motor	Current measurement in the controller (the motor’s electronics) is failing
13	Battery	The battery’s temperature sensor is faulty
21	Speed sensor	Wheel speed isn’t being measured
25	Torque sensor	The pedal force signal is missing or wrong
26	Cadence sensor	The pedalling signal from the sensor is wrong
30	Communication	The display and motor can’t connect to each other

Sources

Bafang DP C271.CAN User Manual (BF-UM-C-DP C271-EN) (2022-06)
Bafang error code sheets (OEM area, FAQ) (2022-09)
Bafang DP E162.CAN / E163.CAN User Manual (2022-11)
Bafang DP E170 User Manual (2019-11)
Bafang DP C18.UART Display Manual, p. 17 (hosted on manualslib)
Bafang DP C18.CAN User Manual, p. 14 (hosted on manualslib) (2019-11)

Explained in Trolda's own words from the manufacturer's public documentation. Trolda is not affiliated with the manufacturer. If in doubt, ask your dealer.

Trolda for your e-bike

Trolda logs your rides with GPS on any e-bike, and reads motor and battery data from the systems it supports.

Get Trolda

Trolda is in open testing on iPhone and Android. You get the app through our tester page, it takes a minute.