antondrache13
XC90 Diesel Cold Start Issue
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.
Did this summary help you solve your problem?
4 comment(s)
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.
rmh_community_comment_box_header
community_crosslink_scanner_headline
community_crosslink_scanner_intro
community_crosslink_scanner_title
community_crosslink_scanner_price
community_crosslink_rmh_headline
community_crosslink_rmh_intro
community_crosslink_rmh_title
community_crosslink_rmh_subtitle
community_crosslink_rmh_brand
VOLVO
community_crosslink_rmh_model
XC90
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?