My 2021 Tahoe 29000 miles, has been at the dealership for 3 weeks awaiting a backordered part. The check engine light came on, as well as the service emissions message. Diagnosis was high resistance reading on the exhaust gas recicirculation cooler temp sensor and the part is on backorder with no expected availability date. I read in another post that something similar happened and a software update seemed to solve the problem. Has anyone had similar issues?