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P0841 - LR PRESSURE SWITCH SENSE CIRCUIT
P0845 - 2C HYDRAULIC PRESSURE TEST FAILURE
P0870 - OD HYDRAULIC PRESSURE TEST FAILURE
That could be in the trans solenoid/TRS assembly or the valve body or of course the TCM.
If you accept my additional service request for your email address, you can give me your email in a private info box and I'll send you the test instructions in PDF files, they are file is rather large.
You will just have to accept the additional service offer and ENTER your email address in the “ENTER CONTACT INFO” section so that I can see it, Thanks