Extruder stepper motor is jumping backwards and forwards

[submariner]

The stepper motor on my me creator extruder jumps backwards and forwards when it is trying to extrude so no filament is being extruded
if I try to retract the filament from the print head it will not retract .
Do I need a new stepper motor? the printer was purchased in January 2016

[Mark]

You might need to check it as the link shows:
http://www.geeetech.com/forum/viewtopic ... 19&t=17097