ABS & Traction Control Lights On? A Faulty Wheel Speed Sensor is a Likely Culprit in Malaysia | MyMechanic

You start your car, and suddenly your dashboard lights up like a Christmas tree: ABS, Traction Control (TCS/DSC), and maybe even a brake warning light are all glowing. While it looks alarming, the cause is often a single, relatively simple component: a failed wheel speed sensor. MyMechanic can quickly diagnose this common issue for Singaporean drivers in Malaysia, getting your safety systems back online.

The Data Source for Modern Car Safety

Each wheel on your car has a small sensor that does one simple job: it constantly measures how fast that wheel is rotating. This information, however, is fundamentally important and is shared with numerous onboard computer systems.

  • Anti-lock Braking System (ABS): Uses the data to detect if a wheel is locking up during heavy braking.
  • Traction Control System (TCS): Compares wheel speeds to detect if a wheel is spinning under acceleration.
  • Electronic Stability Control (ESC/DSC): Uses the data to detect a skid and apply individual brakes to correct it.
  • Other Systems: The data is also used for Hill-Hold Assist, Adaptive Cruise Control, and even the speedometer in some cars.

The Cascade Failure: Why One Fault Causes Many Lights

When one of the four wheel speed sensors fails, it stops sending a signal. The car's main computer now has a blind spot—it knows the speed of three wheels but not the fourth. Because all the safety systems listed above rely on being able to compare the speeds of all four wheels, they can no longer function reliably. As a safety precaution, they all shut themselves down, and each one illuminates its own warning light on your dashboard.

The good news: your normal, power-assisted hydraulic brakes will still work. The car is safe to drive cautiously.
The bad news: all of your electronic safety nets are offline.

Diagnosing and Fixing the Problem on the Roadside

While there are four sensors, you don't have to guess which one is broken. A professional diagnostic scan tool can pinpoint the exact source of the fault.

When you call MyMechanic for this issue in Malaysia, our technician will connect a scanner to your car's OBD-II port. The tool will read the fault codes from the ABS module, which will clearly state something like "Front Left Wheel Speed Sensor Signal Missing." Once the faulty sensor is identified, it is often a straightforward job to replace it on the roadside, clear the fault codes, and get all your safety systems working again.

Dashboard Warning Lights On? MyMechanic Finds the Fault, Fast.

Don't drive in Malaysia without your car's crucial safety systems. If your ABS and traction control lights are on, contact MyMechanic. We provide on-the-spot diagnostics for Singapore-registered cars to identify the faulty sensor and get you back on the road safely.

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Conclusion

A dashboard full of warning lights can be intimidating, but it often points to a single, simple failure. A faulty wheel speed sensor is a classic example. The key is to get an accurate diagnosis quickly to confirm the problem and avoid driving without your car's essential safety features. With mobile diagnostics, MyMechanic takes the guesswork out of the equation, providing clarity and a fast solution for Singaporean drivers in Malaysia.