So I am hoping that someone has experienced this with their truck as well, my 06 2500 HD CTD w/48RE, is having a delayed shift in 1st and 2nd gear. The truck is throwing a P0868 code and P1757 code one is low transmission fluid pressure and the other is 3 psi is present when 0 psi is demanded. I am at a loss i have replaced the transducer with the BD upgraded one, done the GM conversion Solinoid, and a new wiring harness. Someone please help. The transmission is a stage 6 ATS unit.

 

What does ATS say about it?

 

They said its electrical but i don't know how its possible when i have replaced everything electrical.

 

You say wiring harness, but the one in the trans or the external one?

I'm not familiar with the 3rd gens, but the second gens have a connector underneath the area by the drivers toe kick that can be an issue.

Time to start tracing wires/connector up to the PCM.

 

I replaced the internal one. Could it be a bad or corrupt stock file in the ECM?

 

I have the same issue. Can you please let me know what you found out?