So slamming into 2nd, still no 5th, and reverse is gone via electrical testing?
Maybe you need to probe the appropriate wires from ECU to tranny on an oscope and capture some traces and compre with another kind soul who can do the same on his/her working rig. You need to rule out that the ECU is or is not sending the appropriate signals, especially if solenoids are testing OK.
I still suspect internals, but opinions are like poop holes, everyone has one.
Did you check ground point EC on the back of the block, passenger side?
I have a P0771 code that "sometimes" shows up after code is cleared which is kinda weird. Mechanic is checking all the wiring leading up to the transmission.I just ordered the s2 and sr solenoids since I was running out of things to try. Do you know what codes you had if any?
I looked at the passenger side, and I dont see a ground point on the engine. On the drivers side I do see a ground wire going from the body to the driver side head.
It’s on the back of the block. You can’t see it without sticking a mirror or your phone down between the block and the firewall. 10mm bolt, should have a lock washer.
Is that a dealer job? I can only imagine the looks I would get bringing just the ECU to the dealer here.