Originally Posted by crxnut2
I found those but sadly the nhtsa seems to lack details of any sort. I did find an obscure .pdf that refered P1448 to the dreaded(loved if you are in warrany) code of death. however one obscure statement does not prove anything. I will post tomorrow when I get whatever news I shall get.
I can't find anything about it, but it smack between P1447 (battery degradation) and P1449 (battery overheat), so it is likely to be an issue with the performance of the battery sub-modules and not an electrical problem.
Reset your IMA (pull the 4th fuse from the left on the bottom row by the driver left shin for 20 seconds) and see if it comes back eventually, and perhaps this time with a P1449 error also.
Don't despair. It's fixable.