I used to have a 2005 Silverado hybrid, nobody made a tune for it. I looked at custom tunes and most shops said no. Some said they could try it but it would be pricey. Does your truck have an alternator? My 2005 did not, it had a stator but it was placed in the transmission. My recommendation is to stay away from hybrids I had to junk my truck due to Chevrolet not making that part anymore.