Finally I 've trusted my instinct
I've removed the glow plug module ,and checked it ,
Unfortunately after opening it it's covered with some silicone and it's welded very thinly
So I's not fixable , as i understand this module gives the timing for the glow plugs and command each one separately .
P0670 is a glow plow module issue
P1648 is glow plug internal faillure ( code is reset after X cycles by ECU)