i have a 08 Tahoe Hybrid which had the lifters fail due to DOD. I put in new lifters (still the DOD version) and when i pulled the tune so i can turn off DOD it shows it already disabled. I drove it around and it still goes into 4cyl mode. Do the hybrids need extra things to be turned off so the DOD is fully disabled. I have never had any issues disabling DOD in the past with the 5.3s or 6.2s. Simply disable it and it is off. in this case it is already disabled and it still goes in the V4 mode.