I purchased a 2017 Yukon Denali in August of 2024 with 58,000 miles on it. I also got the extended warranty.
In September they had to replace the lifters. In February of 2025, the lifters went again. They wound up replacing the engine with a long block. Since then I have been getting a constant check engine light relating to the Fuel management system, The have replaced all the injectors, the high pressure fuel pump, and the fuel rails. The last go around (Friday) they updated the ECM firmware. 30 hours later.....cruising at 55, check engine. P219A
I am lost with any more ideas. All mechanical components have been replaced, any suggestions? When the light comes on the engine does idle a little rough.