Giant MY20 - Comprehensive Error Code Reference

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5.4 ERROR CODES
As mentioned before, error codes are just an indication of hick-ups that happened. Unless stated otherwise by Service
Tool or Giant information, no part replacement is needed when an error code appears.
DISPLAY FAILURE CATEGORY ERROR CODE FAILURE TYPE ASSIST
A1
SyncDrive
3A
MEMS self-test failure.
On
3B
No any data from MEME for constant time.
21
Drive chain system A communication failure
Off
31
Torque sensor failure.
32
Torque sensor sudden fluctuation.
33
Torque sensor zero point shift.
34
Torque sensor locked with crank rotating.
35
Torque sensor locked at high voltage.
36
Torque sensor locked at middle voltage.
37
Torque sensor locked at low speed.
38
Auto running without crank rotating.
39
Crank rev sensor failure.
61
Current sensor offset.
62
Motor over current.
63
EEPROM failure.
64
Thermistor failure.
65
Circuit board over heat.
66
Invalid parameter.
67
Motor wire breaking.
68
Encoder failure.
F2
Drive chain system A wheel diameter failure
A2
RideControl
27
LCD module failure.
Off
F5
Data ROM failure.
On
F6
Charging function failure.
A3
Bluetooth
28
Bluetooth module failure
On
A4
EnergyPak
72
Battery under voltage.
off
73
Battery over voltage.
CA
Data ROM error.
CB
Precharge time-out.
C1
Over charge.
C2
Over discharge.
C3
Charge over current.
C4
Discharge over current.
C5
Cell over temperature.
C6
Cell thermistor open.
C7
FET over temperature.
C8
FET thermistor open.
71
No battery message.
onF1
Over charge 1 & 2.
F9
Cell imbalance.
A5
Speed sensor
69
Speed sensor failure
on