02 chevy silverado 2 wheel drive with 4.8. My ABS light and the parking brake light in the dash just started flashing this morning. Brakes and everything works just worried what's wrong?

SOURCE: 4 wheel drive on 02 chevy silverado not working

There is a solinoid on the front differential that shifts the front in and out of 4wd, that could be it.

SOURCE: stuck in 4 wheel drive and wont come out.

hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental

SOURCE: 2002 Chevy silverado 2500HD No power steering or brakes

The shaft in your power steering pump has broken. Your brakes work off of a system known as Hydra-Boost. If this shaft is broken then your steering and brakes are lost. I contacted GM after I had my power steering pump replaced and they sent me a check for the cost of my repairs. My truck was not under warranty or recalled but earlier models (2500HD) had been recalled for the power steering pump shaft. The pump was the same part number for my 2002 2500HD as the recalled years. Good Luck!

SOURCE: abs codes co281 & co265

the first of the two codes is for the brake light switch, the one that is under the dash attached to the brake rod and brake peddle. Not much to diag on that one, if its bad it's bad, and when it sets the code that means it's bad.
The second one is for the abs modual, it's under the truck on the drivers side. It is bolted to the top of the thing that has all of the brake lines going to it. MOST all of the time that code is set the modual is bad. It can be a little hard to get the bolts out they are torqs 20 or 25(i'm getting old). There are four of them holding down the modual. There are also a couple of connectors going to it. And some of the time it will blow the fuse for the abs under the hood(its in the underhood fues block). Make sure to clean off the modual before you pull it out. You don't want dirt getting in the solinoids for the BPMV(that's the thing it's bolted to).

SOURCE: 1999 chevy silverado service 4 wheel drive light

I had a similar problem with the Service 4 Wheel Drive light which came on intermittently then became more consistent in the message center display. It would go into 4 wheel drive if the message center did not display the Service 4 Wheel Drive message in the message center, but not when the message was displayed. I found the transfer case switch module in the dash was defective, and it has been working with no other problems for three years.