CEL - P0700 and U0100 Again

[Tomato]

I thought I had this fixed after reading the under-hood fusebox TSB and properly torqueing those bolts, as they were not even at 10 inch pounds.  After I did that, the CEL and codes went away - this was about 2 months ago.  Today, the CEL came back and I had the same codes again.  CEL went away after about 3 or 4 key cycles this time.

 

P0700 is something about the Transmission Control Module and U0100 is a PCM communication error from what I have found. There is also a TSB on the 1500's for a loose connection between the 2...

 

Any ideas or suggestion would be much appreciated.

[Tomato]

I forgot to mention that, oddly, the exhaust brake would not turn on when the CEL was active...Light would flash a few times on the switch then nothing.