2001 pontiac aztek awd known problem is broken wires from wheel hub speed sensor. in the past few days gettign a BRAKE light on dash cluster and the chime if i restart the car it goes away for awhile but will come back. does not come on while usign the brakes or matter what speed

SOURCE: noise in car rear

The rear differential either needs versatrak fluid added or changed.
Located at the rear of the vehicle loosen the top hex bolt and stick your finger in if you don't feel any fluid add some. If you do feel fluid see what color it is. It should be clear if not then its time for change.
Versatrak fluid can be purchased at any GM dealer .You will need almost 4 bottles to do a full change.Once you have either added or changed the fluid do some circles around left and right and drive a few blocks then circle around again and your groaning noise should be gone!

SOURCE: I have a 2003 pontiac aztek anti lock brake and awd lights on !

sell the car

SOURCE: Rear Wheel Bearing Repair; 2005 pontiac aztek

Remove the brake caliper
Remove the disc, (rotor)
Remove the 34mm nut on the axel shaft
Remove the three (3) bolts from the back side
You will need a wheel puller (three jaw will work well)
Place the puller over the hub and tighten, this will push the shaft out of the hub. Now you have to pull the hub assy. out of the mounting bracket. I found hitting each side,of the hub with a lead hammer to work well. Don't forget to disconnect the ABS senser on the back side of the hub assy.
Do not over tighten the 34mm axel nut when you install the new assy. If you use an impact whrench on it you will damage the bearing.

SOURCE: 2002 Pontiac Aztek - AWD disable light and Anti Lock Light

AWD disabled from a sensor unit in rear differential that senses high temp. This thing is over $300. Whine is from fluid. Need to change fluid. This versatrack fluid is about $40 per bottle and you need 3 bottles. Thumping noise is from loose rear knuckle bushings. These are part of the entire rear knuckle assy. and you must replace complete knuckle.

SOURCE: pontiac aztek awd disabled

Mine does this same thing...After taking it to the dealer and paying lots of money I found the solution my self while changing the Driver Side tire. Look behind the tire there should be a little plug for the abs if it comes un plugged in any way or loose then it will disable the AWD. Worked for me hope this works..