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jonathankoenig9

S90 AdBlue Empty Error No Start

My 2021 Volvo S90 diesel is giving me grief. At 169694 km, the dashboard says the AdBlue tank is empty, even though I recently filled it. The error's stored, and the engine won't start! I suspect a defective AdBlue output from the tank to the dosing unit. Anyone else seen this? Repair cost seems to be around 250€.

Summary of the thread

A 2021 Volvo S90 diesel is experiencing an issue where the dashboard indicates the AdBlue tank is empty, despite being recently filled, resulting in the engine not starting. The problem may be due to a defective AdBlue output from the tank to the dosing unit or a faulty sensor. A similar issue in another vehicle was caused by a failed AdBlue pump, suggesting a potential blockage or pump failure. A workshop visit is recommended to diagnose and resolve the issue.

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4 comment(s)

antonfuchs1

Whoa, that sounds familiar! I had a similar issue with my 2017 Peugeot 308 diesel. I kept getting the DEF fluid warning despite topping it off. Could be a faulty sensor, but the 'no start' condition points to something more serious. How was the performance before this? Any weird smells or noises?

jonathankoenig9 (community.author)

Hmm, a faulty sensor... Before this, it ran perfectly, smooth as butter. No weird smells or noises. Could the sensor be throwing a false alarm, or is it struggling to inject the AdBlue into the SCR catalyst?

antonfuchs1

In my case, the AdBlue pump had failed. It was like the pump was trying to supply AdBlue to the SCR catalyst, but the tank was always empty! The sensor was just reporting what it saw – no AdBlue being used. Since yours is preventing a start, it's likely a similar issue, or a blockage somewhere. I'd advise going to a workshop.

jonathankoenig9 (community.author)

Thanks for the insight! A workshop visit is inevitable. Hopefully, it's just the pump. I'll let you know what they find. I appreciate the help!

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VOLVO

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S90