ABS light went on while driving and noise stays on after ignition is turned off.

Hi, the screeching noise could be a wheel bearing,if there is enough play in the bearing this could give a bigger air gap between the abs sensor and reluctor which would bring the abs/tcs lights on.

gmc envoy i had done the same wound up replacing all four wheel brake pads and light stayed off

ABS light comes on with ignition then should go off when you start the car.
If abs sensor does not turn off after disconnecting the battery, then there is a real problem, a faulty sensor or ABS malfunctioning.

Hi I had the same problem with my 06 Kalos and it failed the MOT because of the light staying on I tried all sugestions in different forums including new abs rings new brakes etc what worked for me was swithing the ignition key on and off at least six times turning the key alll the way back and then starting the engine the light did not go initially but the next day but this was enough to pass the MOT it came back on after going over potholes but i done it again and it went off and stayed off.

I just had the same exact problem. The ABS light was on constanly, and the 4x4 high light flashes about 8 times, turns off for about 2-5 minutes, then flashes again for another 8 times and keeps repeating. In addition, I was also hearing and feeling a grinding and clunking noise going in reverse, and the steering wheel was difficult to turn. I changed a bad hub assembly on the front driver side and everything went away...fixed! I wouldn't let anybody tell me that the ABS system and the 4x4 system are not linked together. In fact, my local Ford service department assured me that I had two separate issues. Well, I only had one issue and it was a bad ABS sensor. I hope my exprience helps you.

check the abs sensor rings on each wheel i suspect that one of the metal rings is turning on the drive shaft if so a couple of spot welds will do the trick

wheel bearing went bad abs trac control use same sensor engine light is from pcm for abs problem

No doubt the control module is out, and it continue to operate when the ignition key is off due to a circuit fault. You can disable it easily by pulling the 60 amp fuse in the under hood fuse box (it is listed on the panel as ABS). Note that this disables the ABS braking feature and traction control, so be very careful when driving. The part can be purchased on the GM global parts site, about $600-$700 for the module. This will be the second time this has gone out for me and GM is not sympathetic, rather "pathetic", for a part to fail so often.

It should come on for a few seconds with the other lights, but should not stay on for a minute.  If you get an intermittent ABS light it could be a speed sensor or more likely the ABS module.  If you get an ABS light along with a flashing arrow light, traction control light, or  speedometer and odometer goes out, then it is just about guaranteed to be an ABS module issue.  There are online sites that will rebuild ABS units for around $150 or less.  They are pretty easy to remove and install yourself with the right socket.  Google "Victor Rocha".  His site has good information on the procedure and he is well trusted for his rebuilding jobs (I have no affiliation to him or the site).

check under vehicle on frame rail drivers side, should see abs assembly, disconnect red wire buzzing will stop, will have to replace assembly, will not have abs braking, will have base brakes, if red brake light comes on do not drive vehicle, have towed to repair shop