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ABS and ESC Warning Lights On in 2017 Golf GTI - Code C0031

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Chris P. · rep 0 · May 22, 4:33 AM · 1 replies · solved · Question

Vehicle: 2017 Volkswagen Golf GTI Autobahn

Hello everyone,

I'm having an issue with my 2017 Volkswagen Golf GTI (Autobahn trim) that just popped up. Both the ABS and ESC (Electronic Stability Control) warning lights came on simultaneously on my dashboard yesterday and haven't gone off since. I tried restarting the car a few times, but no luck.

I managed to pull an OBD code using my scanner, and it's showing C0031 - Left Front Wheel Speed Sensor Circuit Malfunction. The brakes feel normal, and I haven't noticed any weird behavior, but those lights are definitely concerning.

Is this a common issue with the Golf GTIs? What's the typical fix for a C0031 code? Any advice on troubleshooting or what to expect at the shop would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:33 AM

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ClearTheCode admin answer:

It's good that you've already pulled the diagnostic trouble code (DTC) C0031, as it gives us a clear direction. This code specifically points to an issue with the Left Front Wheel Speed Sensor circuit, which is a very common cause for both ABS and ESC lights to illuminate.

  1. Understanding the Problem:

    • Wheel Speed Sensors: These sensors monitor the rotational speed of each wheel and send this data to the ABS/ESC control module. This information is crucial for the ABS system to prevent wheel lock-up during braking and for the ESC system to maintain vehicle stability by selectively applying brakes or reducing engine power.
    • C0031 - Left Front Wheel Speed Sensor Circuit Malfunction: This code indicates that the control module is not receiving a valid signal from the left front wheel speed sensor, or there's an issue with the wiring to that sensor.

  2. Common Causes:

    • Faulty Wheel Speed Sensor: The sensor itself can fail due to internal electrical issues, corrosion, or physical damage.
    • Damaged Wiring/Connector: The wiring harness leading to the sensor can get chafed, cut, or corroded, especially near the wheel where it's exposed to road debris and elements. The connector might also be loose or corroded.
    • Damaged Tone Ring/Reluctor Wheel: Less common, but the magnetic ring (tone ring) that the sensor reads can become damaged or obstructed, leading to an incorrect signal.
    • Hub Bearing Issues: In some designs, the tone ring is integrated into the wheel bearing. A failing wheel bearing could potentially affect the sensor's reading.

  3. When to See a Shop:

    • Promptly: While your brakes may feel normal, the ABS and ESC systems are disabled when these lights are on. This means you won't have the benefit of anti-lock braking or stability control in emergency situations, which can significantly increase accident risk. It's advisable to get this addressed as soon as possible.
    • A qualified technician will typically inspect the sensor and its wiring for visible damage, test the sensor's output using a multimeter or oscilloscope, and check for continuity in the circuit. Replacement of the sensor is often the most straightforward fix if it's found to be faulty.
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