2003 GMC Sonoma Q&A
2003 GMC Sonoma Question: ABS light stays on
You need to get a complete brake inspection and diagnostic check on the abs system. One or the other has failed causing your brake lockup issue. - Tyreguy
The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.
The abs light comes on at times but doesn't stay on. I encounter brakes not working and grinding noise not every time I drive it but more often now. Seems to be more at low speeds.
I test the speed sensors in the front hubs and on the rear of the transfer case. I got no resistance on one side and also at the speed sensor on the transfer case. On one speed sensor I had 1140 ...