2020 Nissan Rogue SV: ABS and Traction Control Lights On

ClearTheCode admin answer:

It's definitely concerning when your ABS and Traction Control lights illuminate together, Sarah. This usually indicates an issue within the vehicle's anti-lock braking system (ABS) or traction control system (TCS), which are often interconnected. While your braking might feel normal, these systems are crucial for safety, especially in emergency braking or slippery conditions.

Here's what could be causing it and what you should do:

Common Causes:

• Wheel Speed Sensor Malfunction: This is the most frequent culprit. Each wheel has a sensor that monitors its rotational speed. If a sensor is dirty, damaged (especially after hitting a pothole), or its wiring is faulty, it can send incorrect signals to the ABS/TCS module, triggering the lights. A common OBDII code associated with this is C1103 (Front Right Wheel Speed Sensor Circuit) or similar codes for other wheels.
• ABS Module Failure: Less common but possible. The ABS control module processes data from the wheel speed sensors and controls the ABS pump. A faulty module can cause system errors.
• Low Brake Fluid: While less likely to trigger both lights simultaneously without other warnings, extremely low brake fluid can affect braking systems.
• Faulty Tone Ring: The tone ring (or reluctor ring) is a toothed ring that the wheel speed sensor reads. If it's cracked, bent, or corroded, it can cause erratic readings.
• Blown Fuse: A fuse related to the ABS system could be blown.

What to Do:

1. Check for OBD-II Codes: The most crucial first step is to get the vehicle scanned for diagnostic trouble codes (DTCs). Most auto parts stores offer this service for free. Specific codes will point directly to the problematic sensor or component.
2. Visual Inspection: If you're comfortable, visually inspect the wheel speed sensors and their wiring at each wheel. Look for any obvious damage, frayed wires, or excessive dirt/debris, especially around the wheel you suspect hit the pothole.
3. Check Brake Fluid: Ensure your brake fluid reservoir is filled to the appropriate level.

When to See a Shop:

• Immediately: If you notice any change in braking performance (e.g., spongy pedal, increased stopping distance) or hear unusual noises when braking.
• As Soon As Possible: Even if braking feels normal, the ABS and TCS are disabled when these lights are on, compromising your safety features. A professional can accurately diagnose the specific wheel speed sensor or other component that has failed using specialized diagnostic tools. They can also inspect for physical damage from the pothole impact.

Ignoring these lights is not recommended, as it means critical safety systems are not functioning as designed. Address it promptly for your safety and to prevent potential further damage.