68RFE Issues

[jmorse]

My 2015 Ram 2500 with 68RFE transmission (44000 miles) threw a CEL. Pulled the codes and they are P0933 pressure sensor range performance, P0869 Trans fluid pressure high and a P0935 Hyd pressure circuit high output. ATF looks good. I checked the pressures sensor connection, and it is clean. Dropped the pan to inspect the filters. Saw no issues but installed new Mopar filters. Refilled with new ATF+4. Cleared the codes, but they come back in short order. My scanner will not read drive pressures, so tomorrow I'm taking it to my brother's shop as he has a really good scanner. I'm hoping it shows as a faulty sensor and it is not an over pressure issue as the code suggest. I do not want to continue to drive it until fixed for Fear of damage. Truck is completely stock. Any ideas/ suggestions would be appreciated.

 

[Diesel85]

It might be a corroded connector. Don't rule that out since you live in NYS.

 

[jmorse]

As stated above, I did check the pressure sensor connections. They are clean, but I did apply dielectric grease. Thanks.

 

[Topzide]

Invest in AlfaOBD as it is a powerful tool for our trucks! Will give you the ability to read and clear codes, program features on truck like key fobs. Will give you drive monitors to watch and record. Also will work on both your trucks! AlfaOBD, MX+ Bluetooth dongle and an Android device (phone or tablet), or a Windows PC. No IOS support for Apple. Something to think about.

 

[JamesMorse]

Update: Borrowed a scan tool to read live trans pressure data and pressures seemed in normal range (126psi in Neutral, 159psi in drive (no change between gear shifting and 250psi in reverse). However, I wasn't able to re-create symptoms until this morning. I cleared codes previous from previous day. Trans was cold from sitting overnight. Temps were ~45F and trans pressure was 252psi while in park. Code generated right from startup. When I pulled out of my driveway trans temp was just over 60F and pressures remained at 252psi. Shifting was erratic. I turned on tow/haul mode and pressures immediately went down to 160psi and shifting was normal after. I did not turn turn/haul mode off to see if the pressures stayed corrected. Thoughts?

 

[jmorse]

To put an end to this (sorry it took so long to get back) and make a short story of it. it was the pressure sensor. We replaced it and the transmission has been working properly for a month now. I'm glad it was this simple and fairly inexpensive.