lennyflamme49
V50 preheating lamp and check engine light
Summary of the thread
A 2005 Volvo V50 diesel exhibited issues with the preheating lamp not switching off, the check engine light being on, and smoke during acceleration. These symptoms suggested a potential problem with the preheating control unit. After checking the connections, which appeared fine, it was advised to consider deeper electrical faults or a professional diagnosis. Ultimately, the issue was traced to the cable or plug connection to the preheating control unit, which was resolved at a workshop.
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4 comment(s)
lennyflamme49 (community.author)
Thanks for the quick reply! Yes, I did check the connections to the unit, but I didn't see anything obvious like corrosion. Could it be a deeper electrical fault that's harder to spot without specialized tools?
thomasice81
It's possible it's deeper, like a short circuit within the unit itself. Think of it as a small computer malfunctioning. Given the symptoms and your checks, it might be best to get it diagnosed professionally. They can pinpoint the exact cause and prevent further issues.
lennyflamme49 (community.author)
You were spot on! Took it to a workshop. It was indeed the cable or plug connection to the preheating control unit, like you suggested. Repair cost was 95€. Thanks a lot for the advice!
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VOLVO
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V50
thomasice81
Hey! I had something similar with my V50. Those symptoms sound suspiciously like a defective preheating control unit. Did you check the cable and plug connections to the unit itself? Sometimes, a loose or corroded connection there can cause havoc, like a loose wire in a lamp.