2008 68rfe P0775 P0846 Help

[Dre859]

So my truck has 168800 miles on it. I pulled out of the driveway this morning and made it to the stop sign as I was almost at a complete stop it downshifted really hard then shifted to 4th gear lunging the truck forward and the engine died. Started it back up and drove home and pulled the codes P0775 P0846. Any info would be greatly appreciated.

 

[Jim W]

Google is your friend! This is what I found on the internet, could be correct or not!
P0775-
P0775 Meaning
The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the PC solenoid valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).
P0846-
Also from the internet:https://www.obd-codes.com/p0846

You may want a competent service garage to check this out for you!
Good luck

 

[Dre859]

Thanks for replying. I looked up as much as I could online, but still could not put my finger on the issue. I'm curious if a new solenoid and valve body would fix the issue.

 

[Jim W]

It might, but I would suggest this first!

I would start with the first code P0775 and trying to eliminate this issue first! P0775 may have a voltage issue to the solenoid valve and/or dirty transmission oil blocking oil to the solenoid valve which could be causing the second CEL of P0846! Try this first checking your wiring harness to insure proper voltage to the solenoid valve. The easiest solution is to check the wiring harness for any problems such as corroded pins, bent pins or broken wires and failed terminals. After this look into dirty transmission oil with debris in the pan, when was the last time the transmission oil was changed?

Just my thoughts, other may respond with better advice.