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ABS and Traction Control lights on my 2017 GMC Terrain SLT

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Kevin B. · rep 0 · May 22, 3:41 AM · 1 replies · solved · Question

Vehicle: 2017 GMC Terrain SLT

Hi everyone,

Both the ABS light and the Traction Control light have come on in my 2017 GMC Terrain SLT. They came on simultaneously while I was driving normally, and they've stayed on ever since. I haven't noticed any immediate changes in braking performance, but I know these lights mean something is wrong.

The car has about 80,000 miles on it. I haven't had any brake work done recently, and the tires are in good shape. I'm wondering if this is a common problem for the Terrain and what the likely cause might be.

What should I do to diagnose this, and is it safe to drive with these lights on? Thanks for your help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:41 AM

0

ClearTheCode admin answer:

When both the ABS (Anti-lock Braking System) and Traction Control System (TCS) lights illuminate simultaneously on your 2017 GMC Terrain SLT, it almost always indicates a fault within the ABS system, as the TCS relies heavily on the ABS for its function. While you might not feel an immediate change in normal braking, these safety systems are currently disabled.

Common Causes & Potential OBD Codes:

  1. Wheel Speed Sensor Failure: This is the most common cause. Each wheel has a sensor that monitors its rotational speed. If a sensor fails, becomes dirty, or its wiring is damaged, the ABS/TCS module loses crucial data, triggering the lights.
  2. Damaged ABS Wiring/Connector: The wiring harness leading to a wheel speed sensor can get damaged by road debris, corrosion, or simply wear and tear.
  3. Faulty ABS Module: Less common, but the ABS control module itself can fail. This is a more expensive repair.
  4. Tone Ring Damage: The tone ring (or reluctor ring) is a toothed wheel that the wheel speed sensor reads. If it's damaged or corroded, the sensor can't get an accurate reading.
  5. Low Brake Fluid (less common for both lights): While a low fluid level usually triggers the brake warning light, extreme low levels could potentially affect ABS function.

Relevant OBD Codes (if scanned):

  • C0035 - C0050: These ranges typically indicate issues with specific wheel speed sensors (e.g., C0035 for Left Front Wheel Speed Sensor).
  • C0040: Right Front Wheel Speed Sensor Circuit
  • C0045: Left Rear Wheel Speed Sensor Circuit
  • C0050: Right Rear Wheel Speed Sensor Circuit
  • C0110: Pump Motor Circuit Malfunction (ABS module pump)

What to Do:

  1. Scan for Codes: The most crucial first step is to get the vehicle scanned for ABS-specific fault codes. A standard OBD-II scanner might not read these, so you may need a more advanced scanner or a visit to a shop.
  2. Visual Inspection: If you can, visually inspect the wheel speed sensors and their wiring at each wheel for any obvious damage, corrosion, or loose connections.

When to See a Shop:

While your regular brakes will still function, the ABS and Traction Control systems are disabled, meaning you won't have anti-lock braking in an emergency stop or traction assistance on slippery surfaces. It is safe to drive carefully to a mechanic, but you should schedule an appointment as soon as possible. A professional can accurately diagnose the fault code, pinpoint the exact sensor or component that has failed, and perform the necessary repairs to restore these important safety features.

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