XC60 preheating lamp check engine smoke

Greetings, esteemed Volvo enthusiast! Your predicament with the XC60 sounds eerily familiar. I, too, encountered a comparable conundrum with my XC60. The symptoms you delineated—the recalcitrant preheating lamp, the ominous check engine light, and the disconcerting emission of smoke—bear a striking resemblance to the tribulations I endured. Have you meticulously scrutinized the integrity of the electrical connections leading to the preheating control unit? Ensure they are devoid of corrosion, securely fastened, and functioning as intended. Furthermore, it would behoove you to ascertain whether any diagnostic trouble codes (DTCs) are present, as these may offer invaluable insights into the underlying malady.

Thanks for the quick reply! When you had this issue, did you notice any specific conditions that made it worse, like cold weather or after starting the engine a certain number of times? And what DTCs did you pull?

Ah, an astute query! Indeed, the manifestation of the issue did exhibit a discernible correlation with ambient temperature; the colder the conditions, the more pronounced the symptoms became. As for the Diagnostic Trouble Codes (DTCs), I recall a cascade of error messages pertaining to the preheating system, indicative of a malfunctioning control unit or associated circuitry. Given the potential complexity of the system and the delicate interplay of its components, I would strongly counsel seeking the expertise of a qualified Volvo technician. They possess the requisite tools, diagnostic acumen, and intimate familiarity with the XC60's intricacies to accurately pinpoint the root cause of the ailment and administer the appropriate remedy. In my case, the error disappeared after visiting the workshop. The workshop found out, that the issue was the cable or plug connection of the component. The repair costs were around 95€.

Thanks, that's really helpful! I'll get it to a workshop then. In the end, it was indeed a defective cable or plug connection of the preheating control unit. Cost me 95€.