2003 Buick Rendezvous Repair Question
There is also a grinding noise when we make slow Mostly right turns with the foot on the brake.
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A fault code will be stored in the abs module, scanning it for the code(s) is the starting point for diagnoses, with your vehicle, when a abs fault code is stored, the system shuts down along with all wheel drive. A very common problem with that vehicle is a wheel speed sensor failing. But would need scan to be sure. As for noise, sounds like possible worn out brakes, or could be possible bearing.
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Don't know if you found this out yet, but it is definitely one of the front hubs. The hub/bearing assembly also has the ABS sensor attached, so if any of the three components fail, it needs to be replaced. I have to replace mine about every 40K miles (due for one now, in fact).
It's recommended to do them both at the same time, but I haven't.
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This fix works about 95% of the time! I have the resolution to your AWD disable light and grinding noise problem. You have a bad oil flow valve/sensor, which connects to the bottom of the rear differential. The rear differential fluid has to be drained and refilled with 4 bottles of 16oz versatrak dealer only fluid. Next, drive the vehicle in 4 tight figure 8's, then driven 10 miles. Come back and drain the fluid again and this time install the new oil flow valve/sensor. Next, refill the rear differential fluid with 4 bottles of 16oz versatrak. The AWD disable light should go off and you need to drive in 4 tight figure 8's and the grinding will stop immediately or after driven 1,000 miles. The flow valve and 8 bottles of fluid will set you back about $650, labor not included. GM/ASE 33 years experience, not an Internet only mechanic!
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