What Does the ABS Light Mean?

The ABS (Anti-lock Braking System) warning light means the ABS control module has detected a fault in the anti-lock braking system. When this light is on, ABS is disabled — your brakes will still work normally, but the anti-lock function won't activate during hard braking.

ABS prevents wheel lockup during emergency braking, allowing you to maintain steering control. Without it, your wheels can lock up on slippery surfaces.

Is It Safe to Drive with the ABS Light On?

Generally yes, but with caution. Your normal brakes still function — only the ABS assist is disabled. However:

• Avoid hard braking on wet or slippery surfaces — without ABS, your wheels may lock up.
• If both the ABS and brake warning lights are on, stop driving immediately. This may indicate a serious brake system fault.
• Get the system diagnosed soon. ABS faults don't fix themselves and may worsen.

Common Causes

The most frequent causes of the ABS light:

• Faulty wheel speed sensor — Each wheel has a sensor that monitors rotation speed. These fail due to dirt, damage, or wiring issues. This is the #1 cause.
• Damaged sensor tone ring — The toothed ring the sensor reads can crack, rust, or lose teeth.
• Low brake fluid — The ABS system monitors brake fluid level.
• Faulty ABS module — The electronic controller itself has failed.
• Wiring issues — Corroded or broken wires between sensors and the ABS module.
• Weak battery or low voltage — ABS modules are sensitive to voltage drops.

Related OBD-II Codes

ABS codes are chassis (C) codes. Common ones include:

• C0035-C0051 — Wheel Speed Sensor Circuit (individual wheels)
• C0060 — ABS Motor Circuit
• C0065 — ABS Pump Motor
• C0110 — Pump Motor Circuit
• C0161 — ABS Brake Switch Circuit
• C0236 — Rear Wheel Speed Sensor Signal Erratic

Repair Costs

Australian estimates:

• Wheel speed sensor replacement: $120–$350 per sensor
• Tone ring replacement: $150–$400
• Brake fluid flush: $80–$150
• ABS module repair/replacement: $400–$1200
• Wiring repair: $100–$300