(Therefore some of my previous comments don't seem valid now.) * It appears that Solenoid A (1-2 shift) is not turning OFF, it is staying ON. I don't have the experience to say exactly what it is, but here are my thoughts: 'llI find a picture for you, but it sounds like it is OK from what you have said so far. The "Pressure Switch" is also called the "pressure switch manifold". You absolutely do not need to drop the entire trans or even the valve body to diagnose and likely fix all this. I have many printed out, but the websites are either gone, or I don't know where I got them. I'll try to find some schematics for you later. Either a short, an open or the ECM is faulty and can no longer pull the solenoid circuit to ground. If the solenoids are good, you have an electrical problem. If a solenoid is bad, it is trivial to replace. Note the Solenoid B is spring loaded with a very mild spring. With the oil pan off, you can remove a solenoid in 10 seconds - pull down/out retaining clip and pull out (sideways) solenoid. (Make sure they are disconnected from the trans harness before testing!) If you really wanted to, you could jumper 12V and ground to them to ensure they "snap" and move their plunger. Instead drop the trans oil pan and simply disconnect the solenoids and test them with an ohm meter. If you apply ground or +12 to the wrong wire, you could fry the ECM (computer). While you could try to "poke" into the wiring to diagnose the solenoid, I wouldn't recommend it. P0751 indicates that the transmission is shifting unexpectedly from 1 to 4 and that a likely cause is Solenoid A.
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