Equinox PTC Heater Issue

Greetings! I once encountered a similar predicament with my previous vehicle, a 2014 Opel Insignia, which also featured a diesel engine. The symptoms you described mirror my own experiences, specifically the suboptimal engine performance during the cold start phase and the conspicuous increase in fuel consumption. Does the error code provide any specific details pertaining to the electric auxiliary heater's functionality or performance?

Hey, thanks for the reply! No, the error code isn't super specific, just points to the heating system. You think it's definitely the PTC heater? How did you figure it out on your Insignia?

Given the non-specific nature of the error code and the convergence of symptoms you've detailed, the electric auxiliary heater remains a plausible suspect. In my case, a diagnostic assessment conducted by a certified technician revealed a malfunction within the PTC heating element. It would be prudent to have your Equinox undergo a comprehensive evaluation at a reputable workshop to ascertain the definitive cause and implement the appropriate remedial measures.

Okay, thanks a bunch for the advice! Took it to the shop, and you were spot on – the PTC heater was shot. Cost me 350€ to replace, but now it's running like new again. Appreciate the help!