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2017 Mirage G4 ABS and Traction Control Lights On - What's Wrong?

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Chris P. · rep 0 · May 22, 5:33 AM · 1 replies · solved · Question

Vehicle: 2017 Mitsubishi Mirage G4 ES

Hello everyone,

I'm driving a 2017 Mitsubishi Mirage G4 ES, and recently both my ABS light and Traction Control light (the skid icon) have illuminated on the dashboard. They came on simultaneously and haven't turned off since.

The car seems to drive fine, but I'm concerned about safety, especially with winter coming up. I haven't noticed any strange noises or braking issues, but I know these systems are important. What could be causing both lights to come on at once?

Any insights or similar experiences would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:33 AM

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ClearTheCode admin answer:

When both the ABS and Traction Control (TCL) lights illuminate simultaneously, it almost always indicates a fault within the Anti-lock Braking System (ABS) that also affects the Traction Control System, as TCL relies on the ABS sensors and module. Here are the most common causes:

  1. Wheel Speed Sensor Failure: This is the most frequent culprit. Each wheel has a sensor that monitors its rotational speed. If one sensor fails (due to dirt, damage, or internal electrical fault), the ABS/TCL module loses critical data, triggering both lights. Common OBD-II codes associated with this include C0031-C0034 (for specific wheel speed sensor circuits).
  2. Damaged Wiring to Wheel Speed Sensor: The wiring harness leading to a wheel speed sensor can get damaged from road debris, corrosion, or wear and tear, leading to an open circuit or short.
  3. ABS Control Module Failure: Less common but possible, the ABS control module itself can fail. This module processes data from the wheel speed sensors and controls the ABS pump and valves. A fault here would disable both ABS and TCL.
  4. Low Brake Fluid Level: While less likely to trigger both lights simultaneously without other warnings, extremely low brake fluid can sometimes affect braking system performance and trigger related warnings.
  5. Faulty Brake Light Switch: In some vehicles, a faulty brake light switch can confuse the ABS/TCL system, though this typically also affects cruise control.

When to See a Shop:

  • It is crucial to have this diagnosed promptly. While your car may seem to drive normally, your ABS and Traction Control systems are likely disabled, meaning you won't have their assistance in emergency braking or slippery conditions.
  • A professional shop or dealership can connect a diagnostic scanner to your vehicle's OBD-II port to read specific ABS/TCL codes. Generic OBD-II scanners might not read these manufacturer-specific codes. The codes will pinpoint the exact sensor or circuit that is faulty, allowing for targeted repair. Ignoring these lights compromises your vehicle's safety features.
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