Ive just encountered the 12v battery critical charge error on my XC40 21plate. Had it 3 month with no problems then suddenly displayed 12v battery critical charge error and went into limp mode with what seemed like a variable speed limit between 10 and 30mph max. Pulled over and error disappeared immediately on restart and I got the 5 miles back home ok. Called Volvo assist and he did basic checks and advised I follow him to The Volvo dealer where I purchased the car so they could do a more thorough investigation. The Volvo assist tech had seen this fault many times!! Report back from dealer said battery capacity was down at 46% and the problem was that I had not been doing enough miles despite my calculation id covered 200 miles in 4 seperate journeys the previous week!!! I was pretty speechless at that explaination and asked if there was anything in the owner/user manual that warned or specified minimum milages etc. There isnt basically. This could have quite easily happened on the smart motorway that Id just left. As I am now very apprehensive about using the car on the motorway I am considering reporting this to the DVSA as a serious defect, anybody gone down this route in the past?. Looking at this forum its happened to many people with no certain resolution from Volvo.
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