Stephen Reich

I have the 2020 At4 diesel same issue. At dealer now and all codes etc are normal. All weekend it went from no start with everything haywire to start with engine light on and u0100 and p0700 codes then all clear no engine light no codes. This after I went through hell with 2020 Sierra Denali diesel exhaust filter regen issue to the point I finally traded it fir high book and $5000 from GM to get this truck. Looks like my last $80000 purchase from GM. Going to move to Ford