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lindawagner5

C70 check engine light and stalling

I've got a 2012 Volvo C70 diesel that's giving me some grief. The check engine light keeps coming on, and the engine occasionally stalls when idling. I scanned it, and it's throwing an error related to incorrect fuel composition. I've checked the fuel filter and even tried a fuel system cleaner, but no luck. Any ideas what might be causing this?

Summary of the thread

A 2012 Volvo C70 diesel was experiencing a check engine light and occasional stalling when idling, with an error indicating incorrect fuel composition. Initial attempts to resolve the issue included checking the fuel filter and using a fuel system cleaner, but these did not help. Suggestions included trying a different fuel station to rule out fuel quality issues and checking for faulty sensor connections. Ultimately, a defective cable connection was identified and repaired, resolving the problem.

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4 comment(s)

erwin_tiger1

That's a tricky one. Incorrect fuel composition errors can be a pain. Have you noticed any changes in fuel economy or any unusual engine knock recently? Also, where do you usually get your fuel from? It might be worth trying a different station to rule out fuel quality issues.

lindawagner5 (community.author)

Fuel economy seems normal, and I haven't heard any knocking. I usually fill up at the same station, but I'll try a different one like you suggested. If it's not the fuel itself, could a defective cable or plug connection cause this?

erwin_tiger1

It's possible. A faulty connection to a sensor in the fuel system could definitely throw off the readings and trigger that error. Given the symptoms, and the fact that you've tried the basics, it might be time to have a workshop take a look. They'll be able to properly diagnose the electrical connections and fuel system components.

lindawagner5 (community.author)

Appreciate the advice! I took it to a local shop, and you were spot on. It turned out to be a defective cable connection, which they fixed for 95€. Runs perfectly now!

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VOLVO

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C70