so I might know the answer to my own question but figured I would ask anway. I have an 05 Silverado 2500
hd and I copied the tune over that my cousin has in his 2000 2500. basically my truck threw a check engine light with a few different codes and a battery light. it was also shifting funky and way down on power. I brought it to the dealership and they said the pcm needed an update. any info would be helpful