Hello, feel free to move this, it is diesel specific.
I have a '16 Diesel Z71 4x4, about 7k on the clock. I was experiencing a slow speed issue with the transmission. When in slow traffic, coming to a stop, approaching a stop sign/stop light, the transmission did not seem to release. The RPMs would stay above 1000. Sometime the RPMs would pulse.
Either way, after driving like this for a while, the truck would smell hot, having to hold the brakes to hold back the truck was not the safest feeling.
Called the dealer and they dug up this TSB, which I found on this site:
Some customers may comment on shudder at low speeds, and idle surge when stopped or approaching a stop.
During diagnosis a technician may find DTC P0401 (Exhaust Gas Recirculation Flow Insufficient) set or stored.
This may be due to a calibration concern within the Engine Control Module (ECM).
So far the truck is driving like normal. I don't think I've had some of the other complaints about transmission issues other places on this forum, but I'm hoping this will cure this.