Cadillac CT5 ABS Light On? Wheel Speed Sensor Likely

It's never a good feeling when a warning light pops up on your Cadillac CT5's dashboard. If the ABS light stays on continuously, it's usually telling you the anti-lock braking system has been disabled. The most common culprit? A faulty wheel speed sensor. Let's break down what's happening and what you should do.

Why Your CT5's ABS Light Is On

Your CT5 uses wheel speed sensors at each wheel to monitor how fast each wheel is spinning. The ABS module compares these speeds to detect slipping or lockup. If a sensor sends a bad signal—or no signal at all—the module sets a code and turns on the ABS light. Common causes include:

• Faulty wheel speed sensor: Dirt, metal debris, or internal failure can throw off readings.
• Wiring or connector issues: Corrosion, chafing, or loose connections can interrupt the signal.
• Damaged tone ring: The toothed ring on the axle or hub can crack or get packed with debris.
• ABS module fault: Less common, but possible if the module itself fails.

Start by scanning for ABS codes with a capable scan tool. That will pinpoint which wheel is affected. Then inspect that sensor and its wiring. Often, simply cleaning the sensor or replacing it solves the problem. If the tone ring is damaged, you'll need to replace it or the hub assembly.

Can You Keep Driving?

If the ABS light is the only warning and your brakes feel normal, you can drive—but with caution. Your regular brakes still work, but you've lost the anti-lock function, which helps you steer during hard braking. So increase your following distance and avoid panic stops. If the brake warning light (the one with the exclamation point) also comes on, or the pedal feels soft or goes to the floor, pull over and call for a tow. It's best to get the issue fixed soon; driving with a known ABS fault can leave you vulnerable in an emergency.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.