Numerous Body/Trans/Comm Codes on Startup

[MortallyWounded]

So... 2009 3.7 Base model. On several occasions after starting, my transmission is locked out with the Traction Control Failed warning. The first time it happened, my trans fluid was genuinely low. I replaced the cooler lines, pan filter and gasket, and topped off with Valvoline Max Life (I would have preferred OEM but it's expensive and hard to find around here) and not a drop has leaked since. But about a week later, I had the same message, plus a bunch of U-codes (U0100, U0073, possibly U0010 but I forget). The fluid level was "a little low" so I topped it off after it reached temperature, but I might have added a bit much since I didn't shift through the gears. Anyway, I drove it to Monroe and it drove like crap, like the TCC was acting up. I left it there so they could just lift it up and check for leaks. Everything was solid and they said it even drove fine, except for the persistent rough idle.

By the way, all of this started happening after I changed the spark plugs, hoping that the rough idle would go away. It didn't. Need to check intake manifold.

Anyway, this morning I got a slew of codes again:

Current:
B2AAA - Body
P069E - Powertrain
P0700 - Powertrain
Pending:
B2AAA - Body
P0700 - Powertrain
U0073 - Network
U0100 - Network

So P069E is a fuel pump code (?????) and 700 is a trans code. B2AAA is a scanner incompatibility code. I should mention that I have been leaving in a Bluetooth OBDLink MX module. I unplugged it and, either by chance or by design, the TRACTION CONTROL FAILED warning went off. And she drove great to work. 20 miles over a big hill and up again through the valley. No trouble. After getting to work, I checked one more time:

Current:
B2AAA - Body
P069E - Powertrain
U0073 - Network
U0100 - Network
Pending:
P0700 - Powertrain

I cleared the codes and left it unplugged and am now praying it doesn't give me more trouble before I get home.

So my ultimate questions here: 1) Have any of you had any trouble with any particular scanners causing weird codes or screwing with the computer? 2) Does this sound like a wiring harness issue? 3) Does this sound like a transmission problem?

And please, if my post is TLDR then there's no such thing as too much information.

 

[amrg]

First, check the battery terminals. If oem, replace with quality aftermarket. Second, check the factory ground points for good contact.
The H3 is very sensitive and alor of issues and codes come up that are often associated with those 2 issues.

 

[JTRX]

I was rear ended a few months back and the plug that connects to the fuel pump control module was damaged. Based on how well that plug was seated it would throw a range of different codes to include the transmission. At one point it prevented the transmission from shifting out of park and into gear. Since the harness runs throughout the entire vehicle, the bad connection with the FPCM threw all kinds of codes that I would have never expected. I could fix it by re-seating the plug. I was eventually able to get a new plug and re-pin it to the existing harness and haven't had any issues since. Been meaning to do a write up for it. My guess is there's a bad connection somewhere. I also have an Automatic connected to my OBD2 port.