Hi! Had the same error code 22 but this error only showed with ignition on and before I start the engine. After the engine started only showed light sometimes when I was off the throtle. First I swapped the old battery (4,5 years), then searched the web and finally found this topic! After 2 years of offroad abuse the wire broke from the connector that I used to install the kev mod. I assume the light only showed when I was off the throtle because off the vibration.
Anyway, thanks for the precious help!