GM Service Manual Online
For 1990-2009 cars only

The ABS components are sensitive to Electromagnetic Interference (EMI). Perform the following checks if an intermittent malfunction is suspected:

    • Check for proper installation of wiring harnesses resulting from add-on options.
    • Visually inspect the wheel speed sensor and the toothed ring for the following:
       - Visually inspect for looseness.
       - Visually inspect for damage.
       - Visually inspect for foreign material accumulation.
       - Visually inspect for proper mounting.
       - Replace any damaged components. Remove any foreign material and properly attach all components.
    • Check for proper routing of front wheel speed sensor wiring harness away from spark plug coils.
    • Monitor the scan tool wheel speeds while test driving the vehicle. Refer to the appropriate wheel speed DTC if any wheel speed drops or displays an erratic speed.