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2020 Pacifica ABS/Traction Control Lights On - Grinding Noise

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Sarah K. · rep 0 · May 22, 5:52 AM · 1 replies · solved · Question

Vehicle: 2020 Chrysler Pacifica Touring L

Hey everyone,

I'm having a persistent issue with my 2020 Chrysler Pacifica Touring L. For the past few weeks, the ABS and Traction Control lights have been coming on intermittently. Sometimes, especially at lower speeds or when braking lightly, I hear a grinding noise from what sounds like the front left wheel area.

It's a bit concerning, and I'm worried about safety. The brake pedal sometimes feels a little different too, almost like the ABS is trying to engage when it shouldn't be. Has anyone experienced this with their Pacifica or other Chrysler models?

I haven't had a chance to get it scanned yet, but I'm hoping to get some ideas on what might be going on before I take it to the shop. Any advice or similar experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:52 AM

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This sounds like a classic case of a failing wheel speed sensor, often accompanied by a tone ring issue. The grinding noise and intermittent ABS/Traction Control lights on your 2020 Chrysler Pacifica Touring L are strong indicators.

Here's what's likely happening and what you should do:

  1. Get an OBD-II Scan: The first step is to get your vehicle scanned for diagnostic trouble codes (DTCs). Given your description, you'll likely find codes related to a specific wheel speed sensor, such as C0031 (Left Front Wheel Speed Sensor Circuit), C0034 (Right Front), C0037 (Left Rear), or C003A (Right Rear). This code will pinpoint the problematic corner.
  2. Common Causes:
    • Faulty Wheel Speed Sensor: The sensor itself can fail due to electrical issues, corrosion, or physical damage.
    • Damaged ABS Tone Ring: The tone ring (or reluctor ring) is a toothed ring that the wheel speed sensor reads. It can become corroded, cracked, or accumulate debris, leading to inaccurate readings. On many Pacificas, this ring is integrated into the wheel bearing assembly.
    • Wiring Harness Issues: Less common, but wiring leading to the sensor can be damaged, causing intermittent signals.
  3. What to Check (DIY if comfortable):
    • Visually inspect the wheel speed sensor and its wiring at the affected wheel for any obvious damage or corrosion.
    • If the tone ring is visible, check for rust, cracks, or debris.
  4. When to See a Shop:
    • Immediately: If the grinding noise is constant, severe, or if you feel a significant change in braking performance.
    • Soon: Even if intermittent, ABS and Traction Control are critical safety systems. A professional diagnosis is essential to ensure proper function.
    • A shop will be able to accurately diagnose the sensor and tone ring, and replace the necessary components. Often, if the tone ring is integrated, the entire wheel bearing assembly will need replacement. This is a job best left to professionals due to the need for proper torque and potentially specialized tools.

Addressing this issue promptly will restore your vehicle's safety features and prevent further damage.

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