P0670 Fault in Nissan Note 1.5 dCi 90 KM K9K Euro 5 - Cold Start Issues & Glow Plug System Diagnosis

Hello everyone, I'm reaching out for help with a persistent issue I've been experiencing with my 2012 Nissan Note 1.5 dCi (90 KM, K9K Euro 5) that has just accumulated 25,000 miles. The problem occurs specifically when the outside temperature drops below 0°C — the car struggles to start and often fails to ignite properly. After checking the OBD-II diagnostic system, I've identified a P0670 fault code related to the glow plug control system. I have already verified that all individual glow plugs are functioning correctly, and the glow plug module has been tested and confirmed as operational. Additionally, I’ve inspected all relevant fuses — including those located in the fuse box adjacent to the left front lamp — and they appear intact and properly connected. At this point, I'm unsure what else might be causing this issue. Could there be a faulty temperature sensor within the glow plug system? Or perhaps a missing or defective circuit breaker for the entire glow plug assembly? Does anyone with experience on this model have any suggestions on where to look next? Any troubleshooting steps or known fixes for P0670 in Nissan Note 1.5 dCi vehicles would be greatly appreciated. Thanks in advance for your help!