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My name is ***** ***** I am a Volvo dealership technician. I am going to try to help with your question today. That warning message comes on when the alternator is not charging. This most commonly is a permanent fault caused by a bad alternator. You could have a failing alternator, but it could also be a belt problem. I have seen an instance where an A/C Compressor seized and another shop replaced the compressor but re-used the belts. The belt had stretched and become too loose, causing that warning to come on at times. I would have the shop inspect the belt and tensioner for wear. Otherwise, you can either replace the alternator or wait for the problem to become more permanent to verify the alternator as the cause.
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Right, probably an alternator on its way out. Depending on mileage, you might consider replacing the belts anyway at the same time. You can also do them during the timing belt replacement which may be coming up as well.
Did you have any other questions?