This low battery code refers to the emergency battery inside the phone unit , it is there incase the main car battery is damaged in a crash , so the phone can still call the emergency services for you .
The problem is NOT the car battery OR the phone battery itself , but a glitch in the way the voltage is measured to check it .
It has to be reset on the volvo diagnostic equipment ie , simulate fitting a new battery but not actualy changing it .. your volvo dealer should know this ...
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 My comments are only based on my opinions and vast experience .
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