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antondrache13

XC90 Diesel Cold Start Issue

Experiencing issues with my 2005 Volvo XC90 diesel. Poor engine running during cold starts, stored error, and increased fuel consumption. Diagnostics suggest a defective electric auxiliary heater. Anyone encountered this?

Summary of the thread

The 2005 Volvo XC90 diesel is experiencing poor engine performance during cold starts, a stored error, and increased fuel consumption. Diagnostics indicate a potential issue with the electric auxiliary heater. A similar case with a Mercedes involved a failure in the PTC heater circuit, suggesting that the auxiliary heater might be the problem. The recommended solution is to have the heating system checked and potentially replace the auxiliary heater.

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4 comment(s)

emmaschaefer10

I had similar symptoms with my old Mercedes C-Class. Cold starts were rough, and fuel economy took a hit. In my case, the mechanic suspected the temperature control system. Did you check the heating element for any damage? The blower motor could also be a suspect, maybe?

antondrache13 (community.author)

You mentioned the temperature control system. Could you elaborate on what aspects were relevant in your case? I am also curious if an electrical fault could be the root cause.

emmaschaefer10

Certainly. In my Mercedes, the diagnostic pointed to a failure within the PTC heater circuit, eventually leading to the replacement of the auxiliary heater. Given your symptoms and the error codes, it's possible the auxiliary heater in your Volvo is failing. It's best to get the heating system checked thoroughly. I would visit the workshop.

antondrache13 (community.author)

Thanks for sharing your experience. It seems a defective electric auxiliary heater is indeed the likely culprit. The repair cost is estimated at 350€. I will proceed with the repair as suggested.

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VOLVO

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XC90