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Sorry for the delay, I did not yet, I emailed WAMs to see / verify that programming will resolve the issue first. I have not heard back from them yet. Sent from my iPhone using Tapatalk

I put the K&N Dry CAI in my '15 Denali - Love it - Sounds great! https://www.knfilters.com/71-3082-performance-air-intake-system

My '15 Yukon started doing this 3 months ago... turned out one of my rear Magride shocks was leaking... replaced both shocks and it resolved the issue. (note i have 110K miles on my '15, i would hope '18 shocks would not be leaking yet)

First, Big shutout to @cmatt and @pgamboa - you two rock! Second, I finally got around to retrofitting my '15 Yukon Denali with HUD (yes, it did not come with it - very early version I guess). Thanks to this thread, a harness from CMATT, and other google searching everything is in and working, sorta... Note: before sending my OEM cluster to WAMS to be programmed I thought i would give it a try, and what do you know "0 MPH" was displayed At this point the HUD will display the DEFAULT view, but when I try to switch to a different view via the "INFO" switch - the HUD goes black - no info and will not come back. It is still working as i can move the display box up and down but no data is shown. The only way i can get the data to display again it by disconnecting the cluster connector (P16) from the back of the cluster (essentially resetting it). After that, the data will display again. Question: Does anyone know what might be causing this? is there something to try? Thank you _Dave