2016 Chrysler 200S ABS and Traction Control Lights On, Erratic Speedometer

ClearTheCode admin answer:

Your symptoms – illuminated ABS and Traction Control lights, combined with an erratic speedometer – are classic indicators of a problem with one or more wheel speed sensors or their associated wiring/tone rings. The speedometer often relies on the front wheel speed sensors for its input.

1. OBD-II Scan: The first and most crucial step is to get the vehicle scanned for diagnostic trouble codes (DTCs). While standard OBD-II scanners can read engine codes, you'll need a more advanced scanner (or a visit to a shop) that can read ABS module codes. Common codes you might see include:
   • C0031 - C0034: Wheel Speed Sensor (Left Front, Right Front, Left Rear, Right Rear) Circuit Malfunction.
   • C0040 - C0043: Wheel Speed Sensor (LF, RF, LR, RR) Supply Voltage Malfunction.
   • Other codes related to sensor performance or signal errors.
2. Visual Inspection: Once you have a potential sensor identified by the code, visually inspect the sensor and its wiring at that wheel. Look for:
   • Damaged or frayed wires.
   • Corrosion at the connector.
   • Physical damage to the sensor itself.
   • Debris or damage to the tone ring (the toothed ring that the sensor reads) on the axle or hub.
3. Sensor Replacement: If a sensor is confirmed faulty, replacing it is often a straightforward DIY job for those comfortable working under the car. You'll need to jack up the car, remove the wheel, and typically unbolt the sensor, disconnect its electrical connector, and install the new one. Ensure you use a quality OEM or equivalent aftermarket part.

Common Causes:

• Physical damage to the sensor or wiring (e.g., from road debris, hitting a pothole).
• Corrosion in the electrical connector.
• Internal failure of the sensor due to age or manufacturing defect.
• Damaged or dirty tone ring (less common, but possible).

When to See a Shop: If you don't have access to an ABS-capable scanner, are uncomfortable with automotive repairs, or if replacing the suspected sensor doesn't resolve the issue, take your Chrysler 200S to a reputable mechanic. They can accurately diagnose which sensor is at fault, check for issues with the ABS module itself, or identify more complex wiring problems that might be causing the symptoms. Driving with non-functional ABS/Traction Control can compromise safety, especially in adverse weather conditions.