ABS light and service traction system

If you replaced the rear sensors already, and that was the code that scanned, you need to unplug the sensors, and use an ohm meter to test the wires. You should get a zero or at most five ohm reading, Inspect for visual signs of damage or corrosion. This may require some interior trim removal to access the wires. ABS wires are called "twisted pair" as they are twisted together along their run. This makes for easy identification, Also, if you want to buy an ABS scanner, Actron makes a unit that reads most US makes to 2005, it is model CP 9449, I Googled it and bout one for $114.00 US, not too bad considering the suggested retail is $299.00!

Although either front or rear sensors can go bad, it is more common for fronts to set the code, and no there are a few parts that can set codes, the ABS pump, ABS control module, among others, check the wires to the front sensors, one of them may have come out of a retaining clip, and could be rubbing on something and wore through the rubber sheathing. I just got through looking for tech bulletins on the vehicle, and low and behold, there is a new part for the front hub/sensor and wire, seems the original wire is too short and gets stressed on turns! I will email the particulars so you can buy the right parts to repair the front sensors.

Reply to your private message.
Do yourself a favor, use the GM parts, aftermarket ones may not have that extra 6 mm of length.

It is not a recall, so your vehicle must be under the factory warranty to get free replacement. You did not say if any of this applies to you. If it does, post your make model and year, also mileage, and I will send the TSB to you if you qualify.

Any local garage can scan the codes for the ABS for you.

Here is the tech bulletin :
ABS AND/OR TRACTION CONTROL LAMP ON, AWD DISABLED MESSAGE
DISPLAYED, DTCS SET (REPLACE FRONT WHEEL BEARING AND HUB
ASSEMBLY)
TECHNICAL SERVICE BULLETIN
Reference Number(s): 03-05-25-004A, Date of Issue: April 2004
BUICK: 2002-2004 Rendezvous with All Wheel Drive
CHEVROLET: 2002-2004 Venture with All Wheel Drive
OLDSMOBILE: 2002-2004 Silhouette with All Wheel Drive
PONTIAC: 2002-2004 Aztek, Montana with All Wheel Drive
SECTION: 05 - Brakes
Superceded Bulletin(s): 03-05-25-004, Date of Issue: May 2003
Related Ref Number(s): 03-05-25-004, 03-05-25-004A
ARTICLE BEGINNING
CONDITION
NOTE: This bulletin is being revised to change part number information and
update the model years. Please discard Corporate Bulletin Number
03-05-25-004 (Section 05 - Brakes).
Some customers may comment that the ABS and/or traction control system lamp is illuminated.
Also, the AWD disabled message may be displayed. Upon investigation, the technician may find
several DTCs set.
CORRECTION
When normal diagnosis leads to the wheel speed sensor as the suspect component, replace the
front wheel bearing and hub assembly, P/N 89047684. Refer to the Wheel Bearing/Hub
Replacement procedure in the Front Suspension sub-section of the Service Manual. This new part
has 6 mm (0.236 in) added to the harness to prevent any stress to the wiring.
PARTS INFORMATION
PARTS INFORMATION
Part Number Description
89047684 Hub Kit-Front Wheel
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
WARRANTY INFORMATION
ABS AND/OR TRACTION CONTROL LAMP ON, AWD DISABLED MESSAGE DIS. Page 1 of 2
Labor Op. Description Labor Time
E2320/E2321 Bearing and Hub Assembly, Front Wheel -
Right/Left - Replace
Use Published Labor
Time
E2327 Bearing and Hub Assembly, Front Wheel -
Both - Replace
Use Published Labor
Time

ABS AND/OR TRACTION CONTROL LAMP ON, AWD DISABLED MESSAGE DIS.

I do not know if it does apply, and if trac light is on, there are "C" code stored. Worth checking out. If the code is a front speed sensor, then it probably applies, Part number is in the tech bulletin, but here it is again: P/N 89047684

The whine may actually be the hub bearing on that side, which is a one piece replacement, with the sensor.

If the axle nut is not properly torqued, the bearing can fail almost immediately.

First, go for a ride, then on a straight section of rod, quickly turn the wheel right, then straight, then left and straight, if the noise is loudest on left turn, the right bearing is No good, and vice versa. Then jack up the suspect side, shake the wheel at top and bottom, and side to side, loosness should be felt(play). Proper torque of the axle nut on reassembly is critical, or the new bearing will fail! Torque on yours is: