Hey guys, to get to the point Ive checked voltage at the terminals of the main engine battery and it’s not charging while the vehicle is running or brought up to 2500rpm. The alternator is working as the trunk battery is receiving a healthy 14.2 volts. I checked voltage at the battery fuse terminal and it appears only one of the fuses is receiving 14v. So it appears to be possible the battery current sensor or something else?
little history, 58k miles.Extended warranty ran out couple months ago when I took in for service due to the p058d and they changed the negative battery terminal with the round sensor on there it appears as it’s new.Now let me take you to last week, car was dead wouldn’t start jumped it and made it home. Purchased oem comparable front and rear agm batteries and reset the code. everything was good for a week until 2 more codes appeared, p058d and u0432. Then I tested the charge of the battery and it was down to 55%. Fully charged the battery and restarted car only to find the battery is NOT being charged by the alternator, however the rear battery is receiving the 14+ volts not the front. Any help would be appreciated! Thank you in advance. Raymond.

 

probably a burned out fusible link

 

check the battery fuse block on the battery. the 175 amp fuse #4 may have blown when you boosted the battery. if hooked in the wrong location on the post, the starting draw will flow thru the fuse and blow it. be aware that you can't clamp anywhere; but rather particular spots...possibly studs that don't flow thru fuses. this fuse feeds the aux battery.