ABS and Traction Control Lights On - 2022 Ram 3500

ClearTheCode admin answer:

When both the ABS and Traction Control (TCS) lights illuminate on your 2022 Ram 3500, it indicates a fault within the Anti-lock Braking System. Since the TCS system relies on the ABS for wheel speed information, a problem with ABS will almost always trigger the TCS light as well. While you might not notice immediate braking issues, the ABS and TCS systems are disabled, meaning you won't have their assistance in emergency braking or slippery conditions.

Here are the most common causes for these lights to come on:

1. Wheel Speed Sensor Failure:

   • Cause: This is by far the most frequent culprit. Each wheel has a sensor that monitors its rotational speed. If a sensor fails, becomes dirty, or its wiring is damaged, the ABS module loses critical data, triggering the lights. Common codes include C0031-C0034 (Left Front, Right Front, Left Rear, Right Rear Wheel Speed Sensor Circuit).
   • Action: A professional scan tool is required to read ABS-specific codes. These codes will pinpoint which wheel speed sensor or circuit is faulty. Visually inspect the wiring leading to each wheel speed sensor for any signs of damage, fraying, or corrosion. Also, check the sensor itself for excessive dirt or debris.

2. ABS Module Failure:

   • Cause: Less common, but the ABS control module itself can fail. This module processes sensor data and controls the ABS pump and valves.
   • Action: This is usually diagnosed after ruling out sensor issues. Codes like C0021 (ABS Pump Motor Control Circuit) or internal module fault codes would indicate this.

3. Low Brake Fluid Level:

   • Cause: While usually triggering a separate brake warning light, extremely low brake fluid can sometimes contribute to ABS system warnings.
   • Action: Check your brake fluid reservoir level. Top it off if necessary, but also investigate why it's low (e.g., brake pad wear, leak).

4. Wiring or Connector Issues:

   • Cause: Corrosion, loose connections, or damaged wiring in the ABS harness can interrupt communication between sensors and the module.
   • Action: A thorough visual inspection of all ABS-related wiring and connectors is crucial.

Is it safe to drive? While your regular hydraulic brakes will still function, you will not have the benefit of ABS (which prevents wheel lock-up during hard braking) or Traction Control (which prevents wheel spin during acceleration). In normal driving conditions, you might not notice a difference, but in an emergency stop or on slippery surfaces, the truck will behave like a vehicle without these modern safety features. It's generally advisable to get this diagnosed and repaired as soon as possible, especially since you're driving a heavy-duty truck where these systems are critical for stability and control.

When to See a Shop: Since your basic OBD-II scanner can't read ABS codes, you'll need to take your Ram to a dealership or a reputable independent shop with an advanced diagnostic scanner. They can read the specific ABS fault codes, which will guide the diagnosis directly to the problematic sensor, wiring, or module. Addressing this promptly will restore your truck's full safety features.