Finished my 6l80e swap and battery is dead..been sitting up cple months..i try to jump it and im getting reduced engine power in my message center...still not starting...im firguring i need a battery but will a dead battery put it in reduced engine power?????

 

im fixin to push this bitch into the Bayou!!!!!!!!

 

New battery .... now it cranks and barely runs for a second ... still saying reduced engine power ... several codes... p0449 p0463 p0641 p0700 ... thinking my tuner messed up the ecm or my repinned harnesses arent good ...

 

i had just finished my 4l60e conversion to 6l80e ... any body else have insight on all these codes at once? ive looked them all up and im guessing need retune ... he tunes with efi live and pulled out all my stock tunes and flashed for 6l80e for tcm while leaving my engine tune stock.... all my repinned harnesses were to the tee and seem fine but its odd i have vapor sensor and fuel sensors all together with transmission tcm code

 

Think i found the problem .. Thanks Niff .. Got some repinning to do