Astra h 1.7 Z17DTJ Denso 110hp DTC off P0683-02

Hi please make dtc off P0683-02 (glow plug controller - no communication)

I have swapped the relay/control box for the glow plugs and also multimetered all 4 glow plugs and are all fine, still I get error and service vehicle soon light in dashboard, very annoying.

I saw this video where he also found no problems with the relay or glow plugs and checked it thoroughly but the code still persisted P0683-02. He finally concluded that he had to do a dpf regeneration and after that the error was gone.
Which is weird because what does dpf regeneration have to do with glow plugs

https://youtu.be/59jtYBVoe7k?si=ipEs21wni8_IGK8s

I also did a regeneration and got saturation levels down from 90% to 33% but still occasional svs light and error P0683-02

the only connection there is between dpf and glow plug system i guess is that on some cars the dashboard symbol of the coils is being illuminated both when dpf regeneration is undergoing AND during startup when glow plugs are glowing

Hi please make dtc off P0683-02 (glow plug controller - no communication)

I have swapped the relay/control box for the glow plugs and also multimetered all 4 glow plugs and are all fine, still I get error and service vehicle soon light in dashboard, very annoying.