P0871 not valve body

[kjg26]

I've posted about this issue before but it is still unresolved. I have code p0871. 2016 ram 2500 with 68RE transmission. The valve body has been replaced twice now with the solenoid pack and everything else. Internal the transmission looks spotless. I'm told it could now be a PCM or wiring issue. Where would I start tracking the wires? Troubleshooting PCM issue?

Guidance please.

 

[sag2]

Easiest way is to swap the OD circuit wires at the ECM and transmission with any other pressure sensor circuit. If the fault stays the same the ECM would be at fault, if it changes to the circuit you swapped it with the problem is the wiring.
If you had not already replaced the valve body and the fault stayed the same, the cause would be either valve body or ECM.
Be very careful when changing the terminal locations so you don't introduce another fault by damaging the terminals. If you just cut the wires at both ends and swap them, it does not rule out the terminals.

 

[kjg26]

Can you provide some further details on where this is located. You're suggesting depending the plug and swapping the 2 wires? Also can you provide a wiring diagram for that.

 

[kjg26]

Also what other circuit could I use?

 

[sag2]

Correct, remove the pins out of the connectors and swap the locations. The OD pressure switch circuit is the T9 circuit and the wire color is dark green with a beige tracer. It is pin 16 at the transmission connector and pin 20 at the ECM connector. If you swap it with the LR pressure sensor, it is the T50 circuit and the wire color is yellow with a beige tracer. It is pin 14 at the transmission and pin 47 at the ECM.
If you are not comfortable with removing the pins, cut the wires at each end and move them. Just solder them back and use shrink wrap. Or cut the OD circuit wires at both ends and run a new wire. The problem with cutting the wires is you still have not proved out the terminal ends. The ECM is very expensive and sometimes hard to get, so moving the wires is the best first step to properly diagnosing.