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What causes a slip indicator light to come on?

The slip indicator light on your dashboard typically signals that the vehicle’s traction control system is responding to wheel slip or that there’s a fault in the system.


Understanding what it means


This warning is tied to the vehicle’s traction control system (TCS) and electronic stability control (ESC). When grip is reduced—on slick surfaces, in rain, or during aggressive acceleration—the system may brake individual wheels and/or reduce engine power to help you maintain control. The indicator may flash during active intervention and remain lit if there’s a detected fault.


Common causes


Identifying why the light is on helps you decide whether to slow down and inspect or seek service. The most frequent reasons include:



  • Slipping or spinning wheels on slick surfaces (ice, snow, rain, or loose gravel) triggering TCS/ESC intervention.

  • Worn, damaged, or mismatched tires affecting traction and sensor readings.

  • Low or uneven tire pressure that alters grip and handling.

  • Faulty wheel speed sensors or wiring that feed incorrect data to the ESC/TCS modules.

  • Malfunctioning traction control or ESC control module/software.

  • Manual deactivation of traction control via the off switch, which can cause the light to stay on until re-enabled.

  • Related faults in ABS sensors or wiring (these systems share components and may trigger warnings together).


Note: If the light only flashes briefly, the system is actively helping you maintain control. A steady light often indicates a fault that needs diagnosis.


What to do if the light appears


Next steps focus on safety and diagnosis. Consider the following actions:



  • Check tires for wear, damage, and uniform tread; verify inflation to the manufacturer’s recommended pressure.

  • Inspect for objects lodged in tread or abnormal tire wear that could affect traction.

  • Ensure the ESC/TCS off switch isn’t engaged; reactivate it if you deliberately turned it off.

  • Observe whether the light flashes (active intervention) or remains steady (possible fault). If it stays on, plan a diagnostic with a mechanic.

  • If the ABS light is on in addition to the slip light, treat it as a potential fault that warrants urgent attention.

  • Have the vehicle scanned for fault codes with an OBD-II reader or by a professional to identify sensors or module issues.

  • Schedule service if handling feels unusual, noises occur, or you notice inconsistent braking or steering response.


Regular tire maintenance and timely diagnostics reduce the chance of a persistent slip indicator turning into a safety issue.


Summary


The slip indicator light is primarily a traction and stability safety signal. It can flash during loss of traction or stay on due to a fault in sensors or control modules. Addressing tire condition and seeking professional diagnostics when needed helps maintain safe handling and performance on the road.

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Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.