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2017 Ram 1500 Tradesman - ABS and Traction Control Lights On (C003A)

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Mike T. · rep 0 · May 25, 2:26 AM · 1 replies · solved · Question

Vehicle: 2017 Ram 1500 Tradesman

Hi everyone,

My 2017 Ram 1500 Tradesman (5.7L Hemi) has both the ABS and Traction Control warning lights illuminated on the dash. It has about 95,000 miles on it. I used my OBD-II scanner, and it's showing a code C003A, which points to a 'Right Rear Wheel Speed Sensor Circuit Performance' issue.

The truck seems to drive fine, but I'm concerned about the safety implications of the ABS and traction control not working. I've checked the wiring around the right rear wheel as best I can, and it doesn't look obviously damaged.

Is this a common problem on these Rams? What's usually the cause of a C003A code, and is it something I can replace myself, or should I take it straight to a shop? Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:26 AM

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ClearTheCode admin answer: A C003A code on your 2017 Ram 1500 Tradesman, indicating a 'Right Rear Wheel Speed Sensor Circuit Performance' issue, is a clear sign that the Anti-lock Braking System (ABS) and Traction Control System are receiving incorrect or no data from that specific wheel. This will disable both systems. Here's how to diagnose and address it:

  1. Inspect the Right Rear Wheel Speed Sensor:

    • Cause: The wheel speed sensor (also known as an ABS sensor) is a common failure point. It can fail internally, or its connection can become corroded or damaged. Visually inspect the sensor and its wiring harness for any signs of physical damage, corrosion, or loose connections. The sensor is usually mounted on the wheel hub or axle.

  2. Check the Sensor's Tone Ring (Reluctor Ring):

    • Cause: The wheel speed sensor reads rotational speed from a toothed ring (tone ring) on the axle or hub. If this ring is damaged, cracked, or has excessive rust/debris, it can cause erratic readings, triggering the C003A code. This is particularly common in areas with road salt.

  3. Test the Sensor's Resistance and Output:

    • Method: A multimeter can be used to check the sensor's resistance (compare to a known good sensor or specifications). Some sensors can also be tested for AC voltage output while spinning the wheel, though this is more difficult. A scan tool capable of reading live ABS data can show if the right rear sensor is reporting a speed different from the others.

  4. Wiring Harness Integrity:

    • Cause: Even if the visible part of the wiring looks good, internal breaks or shorts can occur. Trace the wiring from the sensor back to the main harness, looking for pinch points, abrasions, or signs of rodent damage. Corrosion within connectors is also a common issue.

When to See a Shop: Replacing a wheel speed sensor is often a straightforward DIY job for those comfortable working under the truck. However, if after inspecting and potentially replacing the sensor, the code persists, or if you find damage to the tone ring, it's best to take it to a professional. Repairing tone rings can be more involved, sometimes requiring axle removal. Additionally, if the issue points to the ABS module itself (less likely with a specific wheel sensor code but possible), specialized diagnostic equipment and programming are often required.

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