2012 1500 5.7l Hemi p0934

[PapaGoose]

Good afternoon everyone.

Beginning of the issue is about 35k miles ago, I rebuilt my engine, replaced the transmission with a brand new 68RFE. Used mopar trans fluid naturally.

Been having the P0934 hydraulic pressure sensor circuit low code, transmission sometimes shifts hard, sometimes doesn't seem to want to shift. But the fluid is at full mark, doesn't smell burnt or look bad.

I've tried replacing the sensor 3 times, 1 ac Delco, 1 sensor, and one other brand that I cannot remember the name of it.

Possible that I got 3 bad sensors sure. But when I replaced the transmission my tuning software couldn't read the TCM do I could do an electronic relearn, had to do it manually.
A couple of months ago a friend of my one used his expensive ass snap on computer to do the electronic relearn from my transmission and it stuck for maybe a day? Then the code came back.


I just got back from driving supplies and gasoline up to asheville NC after the hurricane. I spent 2 days up there and drove around a LOT engine on and off. Not one time did the code come back while I was in the mountains, but as soon as I came back down the mountain it came back and has stayed on since.


Could this mean an actual pressure issue? Maybe the elevation/reduction in outside pressure helped and that's why the code stayed away? (Also trans shifted sooooo much better while code was off, truck felt almost brand new compared to how it is most of the time where I live)


I've also conductivity checked the wiring and it all seems good as well.

What would you guys suggest?

 

[Tominator223]

I bought a lil plug in for my 04 5.7 that tells the ecm line pressure is low so the ecm will up pressure for more line pressure . Have you checked the pins in the plug to the sensors. I’d look into which sensor could be affected by altitude

 

[PapaGoose]

I bought a lil plug in for my 04 5.7 that tells the ecm line pressure is low so the ecm will up pressure for more line pressure . Have you checked the pins in the plug to the sensors. I’d look into which sensor could be affected by altitude

I haven't looked into which sensors can be affected yet, but I've verified sensor and plug pins/connections are good. Just don't know exactly what is causing the problem

 

[Daw14]

You should only use whatever brand sensor that the factory originally chose to use . You will have the best chance of a successful repair .

This is for all manufacturers.

 

[PapaGoose]

You should only use whatever brand sensor that the factory originally chose to use . You will have the best chance of a successful repair .

This is for all manufacturers.

So I should order one from mopar?