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Hey guys new here, I have a 2004 e55 amg and recently in started having an issue I get the dreaded red battery message I recently had the starter and alternator replaced and and the front battery everything was fine but now I’m getting the message again and my mechanic told me it was cause of the rear battery not being an agm so I got one yesterday but it still does the same thing it will start no problem and then the red battery message and esp abs messages come on radio doesn’t work and when I check the voltage at idle is 14.5 but when I give it throttle it rises to 15 16 17 volts so thought it was the voltage regulator so I talked to my mechanic and he told me it’s the bcm because when I reset the bcm it charges fines until it happens again so he tells me it’s the bcm (battery control module) anyone ever have this issue. THANKS IN ADVANCE GUYS!!


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