I had a check engine light come on my 2016 Tahoe 5.3 . Dealer stated injector #5 was failing, $1016 to replace it. The vehicle has 55000 miles and still is under drive train warranty. Dealer also stated injectors are not under drive train warranty account they are not part of the drive train even though you have to take intake manifold off to get inside the engine to replace them. 4.6 hours labor to replace one,at $100 an hour.That makes the part nearly $500 ????? I told him to push it out the door if they couldn't get it to run and I would have a wrecker pick it up. Then they charged me $116 for plugging computer up and fullfilling 2 GM recalls.???Then they tried to sell me an extended warranty for $3300. WOW !!! I need a telephone number for customer service at GM in Charlotte, N.C.