My 2009 silverado 5.3L FF is acting up. Here'* what I know.

My cruise control stopped working, shortly later (and every time I drive now after a few miles) I get the "service stibilitrak" and "service traction control" read out on my dash. This was accompanied by hard and erratic shifting in tow mode (I pull a trailer a few times a week.)

I began using manual shifting when pulling my trailer to avoid the high RPM shift points and down shifting.

Today i noticed in addition to the other two issues my truck is now telling me i have a trailer brake issues. I went and bought and installed the ITBC (integrated trailer brake control relay) GM part no. 20904439. The error popped up after starting and i cleared it off my display and it seems to be okay now. Altough i only went on one test drive from posting this.

I checked the front wheel sensors and I got 5.39 ohms. When i shut my truck off now my radio shuts off immediately and I can't lower windows. Radio use to stay on for 10 min if i didnt open the door and I could also use my windows for the same amount of time. This isn't an issue for me but it'* all got to be connected somehow. Not having cruise control is not ideal.

Since buying this truck 3 years ago ive always had service air bag light on. Replaced both driver and passenger air bag sensors and didnt resolve it. Im wondering if all my issues are tied to the computer which ive been told is under the center console. Do you think stabilitrak and traction control are possibly bad due to my main computer/ECM

I'm at a loss guys, I really need tow mode and I hate running my truck with any issues.

Scan all modules for codes and give us the list. Need it in the format POxxx etc.

Agree on the codes.

Also:

How many miles on it?

How many miles have you owned it?

4WD or 2WD?

Has there been any major trauma in its life that you know of (flood, crash, abuse, etc.) ?

Has the suspension been lifted or lowered?

Any recent modifications?

Any recent repairs?