Sensor Output Check
WARNING: This page is about a different car, the 1988 Buick Riviera and 1988 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.
Conditions that result in low wheel speed sensor output can set one of the above listed codes. Check for a short to ground of circuits No. 884 and 885, a shorted wheel speed sensor coil or an improperly installed sensor.