The ABS light comes on in the dashboard of Chevy Silverado 2500 HD when one or more of the wheel speed sensors have malfunctioned, brake fluid is too low, the fuse is blown or the relay is bad, tire pressure is low, or if the ABS module has developed a defect. When the ABS light / comes on in your Silverado HD, the anti-lock braking system is Your anti-lock brake light could be on as part of a routine system check, or it could be alerting you to a problem with your ABS brake system: Routine self-check (the light is briefly on at startup) Malfunctioning ABS computer module. Broken or corroded ABS sensor. Bad wheel bearing. Dirty tone ring. The ABS light comes on in the dashboard of GMC Sierra 2500 HD when one or more of the wheel speed sensors have malfunctioned, brake fluid is too low, the fuse is blown or the relay is bad, tire pressure is low, or if the ABS module has developed a defect. When the ABS light / comes on in your Sierra HD, the anti-lock braking system is disabled.
How this system works: When an issue arises with your anti-lock brake system (ABS), a corresponding light will illuminate on your dashboard. The light will display as the acronym “ABS.”. Your ABS exists to keep your car from skidding dangerously during braking. It is an automated safety system that recognizes when your wheels stop rotating
Check the resistance of your abs sensors. With your multimeter in hand, you should check the resistance of your abs sensors first. Set multimeter to ohms (Ω) sign. First, attach your multimeter’s positive probe (red) to the positive terminal on your sensor and then touch the negative probe (black) to the negative terminal.

Step 2: Open the Hood. Next, you need to open the hood and locate the abs module. The abs module is usually located near the battery. You need to make sure that the car is turned off before you start testing the abs module. You also need to check that the battery is disconnected.

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how to test abs system