2019 Renegade Latitude - ABS & Traction Control Lights On

When both the ABS and Traction Control (TCS) lights illuminate, it typically indicates a fault within the Anti-lock Braking System, as TCS heavily relies on ABS components and sensors. While you might not feel an immediate difference in normal braking, your ABS and TCS functions are likely disabled, which can impact safety in emergency braking or slippery conditions.

Common Causes:

1. Wheel Speed Sensors: These are the most frequent culprits. Each wheel has a sensor that monitors its rotational speed. If one sensor fails, becomes dirty, or its wiring is damaged, the ABS/TCS module receives inconsistent data, triggering the lights. Common OBD-II codes for this include C0031 (Left Front Wheel Speed Sensor), C0034 (Right Front), C0037 (Left Rear), C003A (Right Rear).
2. ABS Module Failure: Less common, but the ABS control module itself can fail. This is usually a more expensive repair.
3. Wiring Issues: Damaged or corroded wiring to the wheel speed sensors or the ABS module can cause intermittent or permanent faults.
4. Low Brake Fluid: While you've checked this, it's a common cause for the brake warning light, which can sometimes be linked to ABS/TCS issues if the system detects a critical fluid level.
5. Faulty Tone Ring: 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.

When to See a Shop:

• Immediate Diagnosis: It's recommended to have your vehicle diagnosed as soon as possible. While your regular brakes may still work, the advanced safety features of ABS and TCS are disabled.
• Diagnostic Scan: A professional shop can connect a diagnostic scanner to your vehicle's OBD-II port. This will retrieve specific fault codes (DTCs) stored in the ABS module, which will pinpoint the exact cause of the problem, most often a specific wheel speed sensor. This is the most efficient way to diagnose and repair the issue.