Does the code scanner that you used read codes from the transmission control unit? Often the inexpensive scanners will only read the basic codes from the engine computer and the TCU is a completely separate module.
My hunch is that you have a stuck or failing solenoid. My 'hunch' is as useful as someone telling you its the IMS. Unless you can do a proper scan, you may be wasting money with fluid.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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