I found the following error in the error log of my Ford Focus Tunier 1.6 tcdi diesel 109HP (2006):
P0380 OBD-II Trouble Code: Glow Plug/Heater Circuit “A”
First i thought it was due to a defect glow plug - as the error message indicates.
I then messured all glow plugs based on this answer by touching one end of a ohm meter to the end of the glowplug and one on the engine. All glow plugs had the same resistance.
The car still drives but it is in limp mode. This means that the rpm and the acceleration of the car is limited (~3000rpm).
Based on the resistance measuring i assume that the glow plug isn't the reason for that error.
What else could be the cause of this error? (And how to fix it?)