2023 Ford Mustang GT - ABS & Traction Control Lights On

ClearTheCode admin answer: When both the ABS and Traction Control lights illuminate on your 2023 Ford Mustang GT, it indicates a fault within the Anti-lock Braking System (ABS) or the Traction Control System (TCS). Since these systems are interconnected and rely on similar sensors, a fault in one often triggers a warning for both. Your basic OBD-II scanner likely won't show 'P' (Powertrain) codes because these issues typically generate 'C' (Chassis) or 'U' (Network) codes, which require a more advanced scanner.

Common Causes for ABS/TCS Lights:

• Faulty Wheel Speed Sensor: This is the most common culprit. 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 critical data.
• Damaged ABS Tone Ring: The tone ring (or reluctor ring) is a toothed wheel that the wheel speed sensor reads. If it's cracked, bent, or corroded, it can cause incorrect readings.
• Low Brake Fluid Level: While less common to trigger both lights simultaneously without other brake warnings, a very low fluid level can sometimes affect system performance.
• Faulty ABS Module: The ABS control module itself can fail, leading to system errors. This is a more expensive repair.
• Wiring Issues: Damaged wiring or connectors to the wheel speed sensors or ABS module can cause intermittent or permanent faults.

Initial Checks You Can Perform:

1. Visual Inspection of Wheel Speed Sensors and Wiring: Carefully inspect the wiring leading to each wheel (behind the wheels) for any signs of damage, fraying, or loose connections. Look at the sensor itself for any visible damage or excessive dirt/debris.
2. Check Brake Fluid Level: Ensure your brake fluid reservoir is filled to the appropriate level.

When to See a Shop: Since your basic scanner can't read the specific 'C' codes, it's essential to take your Mustang to a Ford dealership or a mechanic with an advanced diagnostic scanner. They can:

• Read the specific 'C' codes (e.g., C0031-C0035 for wheel speed sensor faults) to pinpoint the exact wheel or component causing the issue.
• Perform live data monitoring of each wheel speed sensor to identify which one is providing an erratic or no signal.
• Diagnose the ABS module if all sensors and wiring are confirmed to be good.

It's important to address ABS/TCS warnings promptly, as these systems are crucial for vehicle safety, especially in emergency braking or slippery conditions. While the car might drive normally, the ABS and Traction Control functions are likely disabled.