I have a 2023 Silverado 3500HD SRW - 10 speed Allison Diesel.. 40K km's on it, just encountered the same issue. Being told by dealer unknown when the valve body will be available. Suggested I get a rental.. cause ya who can afford that after paying nearly $100K FOR A VEHICLE.. Have been a GM person by default my whole life - as my father worked factory for 33years, but growing more and more disappointed, with product, dealerships etc... Could be saying goodbye to my camping season...