Code P1698 No Bus from TCM

I keep getting a message that says P1698 No BUS message from TCM. This happens only when the dash lights go out intermittently. Still shifts gears but shifts are hard nearly feels like an old 350 turbo with a shift kit installed or how we used to remove the spring that would allow it to snap into gear giving your tires a chirp between first and second with a very stiff jolt into third. “One time the dashboard lights went out (only once) it happened and the vehicle would only switch from first to second and the rpm's jumped to about 6,000 before I noticed that it was not switching gears.” I powered it off restarted and it began switching gears again but that only happened once while the dash lights were out.

The tachometer works while the rest of the cluster quits including speedometer. All gauges will not work when the dashboard lights go out. The ABS illuminates when the dash lights go out. The check engine light only comes on if the lights have been out for some time approximately thirty miles or the third restart it illuminates.

If cruise control is activated and the dash lights go out the gas pedal slams itself to the floor for wide open throttle.

Everything else still works while this happens both front power windows, stereo, fan for defrost/AC/heat, horn, turn signals etc. The information center console works during this outage just fuel mileage estimate just reads nothing until the dash lights come back on.

The rear vent windows on both sides will not open or close whatsoever at anytime.

This may happen three times a week or could go an entire month and not do this but once.

(Keep in mind the transmission not shifting out of second gear has only happened on one single occasion).

What could this be TCM? BCM? Bad solder on speedometer control board? Speed phasers input and output are new and did not resolve issue.

The rear vent windows a total separate issue? Window control switch is new but did not resolve the issue.