What gear is it in when you put it into drive?Also adding that I didn’t clear codes today but the day this started I did reset it so all codes are pretty fresh from just a few short drives
Codes 28 and 59 are the pressure switch manifold assembly, a small electronic part bolted to the valve body. Its job is to tell the PCM what gear the transmission is currently in and what the fluid temp is by monitoring for pressure within the various hydraulic apply circuits and streaming temp readings to the pcm.
So if its bad, youll be in limp mode and have only reverse and second gear. Line pressure defaults to max when in limp.
Here's the part in question - its the oblong shaped object with six bolts going through it.
You must be registered for see images attach