Hello everyone. We currently have a 2006 XC90 2.5T and ever since we've had it the car would randomly shut off while either driving or idle at a stop light, stop sign, etc. The dashboard goes dark and the steering wheel locks. When this happens we put the car on park, turn it on, and press the gas. Most times this works and the car starts up and continues to drive. Other times we are not so lucky and the car will not turn on at all. We have to wait at least 20 minutes before it will start up again with out any problems. Some days it doesn't do this at all and other days it will do it 2 to 5 times a day. Please help.

 

It could be a problem with the fuel system or ignition system. Have you noticed any patterns when it happens, like specific driving conditions or weather?
Check for blockages in the fuel lines and the fuel pump's functionality. A weak fuel pump can cause the engine to stall because it's not getting enough fuel.
Also, look at the ignition parts like the coils, spark plugs, and ignition control module. If they're faulty, the engine might stop working from time to time, especially when the engine is under load.
Plus, maybe, check the electrical connections and wires.

 

I am a bit late with this reply, and in fact registered just to make it, but if you have not already figured it out, I will tell you what it ended up being with my 2004 XC90 T6, and what others have reported as well. You could probably confirm by doing a home smoke test. I personally just took a rip off my vape and blew it into the hose to see if it would come out elsewhere.

If the 06 has the same turbo plastic air handler set up, check it in the back driver side near the motor mount. I would wager you find a chunk of the plastic broken off the plastic tubing. I think that is probably going to end up being your problem. As for problems, it's not too bad of one to have since the fix is relatively cheaper than it could be. I paid one of the more spendy auto shops in my area to do it for me, and I want to say I came out under $300. If you are even halfway decent as working on things yourself, you should be able to do it at home no problem.