I had 8,000 miles left on the power train warranty. Injectors were not covered under power train warranty, they’re considered “electrical”, despite the fact that they are pressed into the heads, have fuel travel through them and have a valve that opens and closes, creating a mechanical operation...but they are activated with electricity, so GM will not cover them under power train. Nice.
As for the torque converter/transmission, misfires. Called the dealer, they said despite being under power train warranty they would have to charge me a diagnostic fee to determine if it was a power train issue...if it was not, I’d be paying for the repair. My misfire check engine light was intermittent, they weren’t going to discover my misfire event unless they hooked up a scan tool and drove up and down the highway. And then what I’ve read and heard is “misfires are normal on these trucks”. As for the torque converter shutter - there was no check engine light for that either - just constant shifting up to this gear, then down, then up. Happened Every time the truck went into V4 mode. As for the oil consumption, GM considers it “normal“ to consume a quart of oil every 1,200 miles or so, plus I did all of my own oil changes every 5,000 miles using Pennzoil platinum, or Shell Rotella Gas Truck synthetic, but I only kept half my receipts (which was my fault, but I didn’t think I’d need them).