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Ok, is the P1870 code still present?
I also need the last 8 of the vin to check for related service bulletins, which I believe there is one for this
Ok, let me know if the code returns.
On this vehicle, there is a service bulletin out stating that the P1870 code is for internal transmission component failure - valve body, torque converter clutch, fluid pump, or other issue, and not due to the solenoids.
Once you see if the code returns or not, let me know
i would think your problem is that new 1-2 shift solenoid you installed,,
it did work before you replace it.so,i would think the new one is bad..both the 1-2 and the 2-3 are the same..remove the 1-2 and install one of the others that you removed,