Just wanted to add to this thread.
I had the following codes 5A48 5A55 5073 and 5074. My car has 57k miles on it, RB's done along with TA's. When driving the car I noticed 0 issues with the transmission. It drives like it did when it came off the lot.
I was getting the Transmission Malfunction code every so often and was not able to get my car out of park. After starting and stopping the car 5-10 times I was able to finally get the car to start.
I replaced the battery, got a battery tender, replaced the alternator, and didn't have any luck. I finally replaced the ground strap, cleared the errors and thankfully I haven't had any additional errors. I would recommend starting with the ground strap, it would have saved me a few dollars.
I'm not too upset about the new parts I put in the car, but its crazy to think all of this was due to a grounding problem. Hope this helps someone in the future.
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