The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2017 GLE 350 ABS & ESP Lights On - C0031 Code

0

Mike T. · rep 0 · May 25, 3:06 AM · 1 replies · solved · Question

Vehicle: 2017 Mercedes-Benz GLE 350

Hello fellow Mercedes owners,

I'm dealing with an issue on my 2017 Mercedes-Benz GLE 350. Recently, both the ABS and ESP warning lights have illuminated on my dashboard. Sometimes, the traction control light also comes on.

I used an OBD-II scanner, and it pulled a code: C0031 - Left Front Wheel Speed Sensor Circuit Malfunction. I cleared it once, and the lights went off for a short drive, but then they came back on.

Has anyone else encountered this specific code or these lights on their GLE? What's the typical fix for a wheel speed sensor issue, and is it something I can tackle myself, or should I definitely take it to a shop? I want to make sure my braking and stability systems are fully functional.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:06 AM

0

ClearTheCode admin answer:

The C0031 code, indicating a 'Left Front Wheel Speed Sensor Circuit Malfunction,' along with illuminated ABS and ESP lights on your 2017 Mercedes-Benz GLE 350, points directly to a problem with the wheel speed sensor on that specific wheel. These sensors are crucial for the proper operation of your Anti-lock Braking System (ABS), Electronic Stability Program (ESP), and traction control, as they provide real-time wheel rotation data to the vehicle's computer.

Common Causes for C0031:

  1. Faulty Wheel Speed Sensor: The sensor itself can fail due to internal electrical issues, damage from road debris, or corrosion over time.
  2. Damaged Wiring/Connector: The wiring harness leading to the sensor can get frayed, cut, or corroded. The connector itself might be loose or have corroded pins.
  3. Contaminated Sensor/Tone Ring: The wheel speed sensor reads pulses from a 'tone ring' (also called a reluctor ring) located on the axle or wheel hub. If this ring becomes dirty, damaged, or corroded, the sensor may not get a clear signal.
  4. Wheel Bearing Issues: In some cases, a severely worn wheel bearing can cause play in the hub, affecting the sensor's ability to read the tone ring accurately.

Troubleshooting Steps:

  1. Visual Inspection: Physically inspect the left front wheel speed sensor and its wiring. Look for obvious signs of damage, cuts, or corrosion on the wire and connector. Ensure the connector is securely seated.
  2. Check Tone Ring: If accessible, inspect the tone ring behind the hub for any damage, cracks, or excessive dirt/debris.
  3. Test Sensor (Advanced): A multimeter can be used to check the sensor's resistance or signal output, though this often requires specific knowledge of the sensor type (passive vs. active) and expected values.

When to See a Shop:

While a visual inspection is a good starting point, replacing a wheel speed sensor often requires specific tools and knowledge to ensure proper installation and routing of the new sensor and wiring. More importantly, after replacement, it's often necessary to clear the fault codes using a Mercedes-Benz specific diagnostic tool (like XENTRY/DAS) to ensure the ABS/ESP system fully resets and recognizes the new sensor.

Driving with these lights on means your ABS, ESP, and traction control systems are not fully functional, which can significantly impact vehicle safety, especially in emergency braking or slippery conditions. It's highly recommended to have a professional mechanic diagnose and repair this issue promptly to restore your vehicle's safety features.

Menu

Help & account