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S90 Diesel Stalling and Rough Idle

Hi, I'm having some trouble with my 2022 Volvo S90 diesel. It's got about 146,000 km on it. Recently, it's been having trouble starting, and sometimes stalls when idling. The check engine light is on, and the engine runs a bit rough. I've also noticed my fuel consumption is higher than usual. I scanned for codes and there's definitely an error stored. Any ideas what could be causing this?

A 2022 Volvo S90 diesel with 146,000 km is experiencing starting issues, stalling when idling, a rough-running engine, and increased fuel consumption, with the check engine light on. The problem was identified as a defective cable causing a bad connection to the fuel pump. Replacing the faulty connection resolved the issue, eliminating the error and improving engine performance.

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4 comment(s)

I had similar symptoms in my S90. Does the engine completely die, or just stumble? It might be worth checking the fuel pump relay and connections. A faulty relay can cause intermittent fuel delivery issues leading to stalling and starting problems.

Thanks for the quick reply! When you say 'connections', are you referring to the wiring harness that connects to the fuel pump itself? And did the check engine light come on for you as well?

Yes, I am referring to the wiring harness and plug connection. Corrosion or a loose connection can definitely cause those symptoms, and trigger the check engine light. I would advise against further diagnosis without professional tools, and instead suggest taking your S90 to a trusted workshop.

Thanks for the help! I checked the fuel pump connections as suggested, and it looks like you were right. The cable was defective, causing a bad connection. I took it to a shop, they replaced the connection, and the error is gone. Total cost was 95€ Appreciate the pointer!

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VOLVO

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S90