I’m thinking the current vb in the truck is warped, and when i disconnect the battery (late at night) and let the trucks trans cool down that the vb is unwarping or getting more flat and promoting more of a seal and easier valve movement, which is why the line pressure sensor works for the first drive and stops the next. I have yet to receive a P0871 code though.
Edit: I thought about it more, i’m still unsure about a warped VB as the P0934 code comes on RIGHT after the engine is switched off and back on, and unless the 65RFE has cast a spell to summon a ice demon, i don’t think it’s possible to unwarp that quickly, but then again, it could be bleeding off somewhere, and losing prime.
Second edit: I completely forgot to add this, but the 6th to 5th downshift is perfect 100% of the time when there’s no throttle being applied, and it doesn’t do it around 50% of the time when there’s VERY light throttle applied. I also read this may be normal, as the torque converter is being slipped as the truck needs more power? This would also explain the “issue” the truck has at 25MPH as it does the EXACT same thing.
Sent from Blue Onyx