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2020 Outlander SEL - ABS light and strange brake pedal feel after heavy rain

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Mike T. · rep 0 · May 24, 3:11 PM · 1 replies · solved · Question

Vehicle: 2020 Mitsubishi Outlander SEL

Hey everyone,

I'm having an issue with my 2020 Mitsubishi Outlander SEL. After driving through some pretty heavy rain and a few large puddles yesterday, my ABS warning light came on and has stayed on. The brake pedal also feels a bit different now – it's a little softer and sometimes I feel a slight pulsation when coming to a stop, even without hard braking.

I've checked the brake fluid level, and it seems fine. There are no obvious leaks around the calipers or lines that I can see. I'm worried it might be something serious with the ABS system itself. Has anyone experienced this with their Outlander or other Mitsubishi models?

Could it be a bad wheel speed sensor, or something more complicated like the ABS control module? Any advice on what to check first or common causes for this specific model year would be greatly appreciated before I take it to a shop. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 3:11 PM

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ClearTheCode admin answer:

It sounds like your 2020 Mitsubishi Outlander SEL is experiencing a common issue related to the ABS system, often triggered by moisture or debris. The ABS light, combined with an altered pedal feel, points directly to a problem within the anti-lock braking system or its related components.

Here are the common causes and steps you should consider:

  1. Wheel Speed Sensors: These are the most frequent culprits. Driving through deep water can damage the wiring, or cause corrosion or debris to accumulate on the sensor itself, leading to intermittent or complete failure. A faulty sensor sends incorrect data to the ABS module, triggering the light and potentially affecting braking performance. Common OBD-II codes for wheel speed sensor issues include C0031-C0035 (for specific wheel speed sensor faults).
  2. ABS Control Module: While less common than sensor issues, the ABS control module can fail, especially if exposed to moisture or electrical surges. A failing module can cause erratic braking behavior and illuminate the ABS light.
  3. Wiring and Connectors: The wiring harnesses connecting the wheel speed sensors to the ABS module can become corroded, frayed, or disconnected, especially in areas exposed to road grime and water. A thorough visual inspection is recommended.
  4. Tone Ring Damage: The tone ring (also known as the reluctor ring) is a toothed ring that the wheel speed sensor reads. If it's cracked, bent, or heavily corroded, it can send inconsistent signals to the ABS module.

What to do:

  1. Scan for Codes: The first and most crucial step is to use an OBD-II scanner to read any stored diagnostic trouble codes (DTCs). This will often pinpoint the specific wheel (e.g., C0031 for Front Left Wheel Speed Sensor) or component causing the issue. Many auto parts stores offer free code reading services.
  2. Visual Inspection: Once you have a potential code, visually inspect the wheel speed sensor and its wiring at the affected wheel. Look for physical damage, corrosion, or loose connections. Ensure the sensor is clean and free of debris.
  3. Check Brake Fluid Quality: While you checked the level, also ensure the fluid isn't excessively dark or contaminated, though this is less likely to cause an ABS light directly.

When to see a shop:

It's highly recommended to take your Outlander to a qualified mechanic as soon as possible, especially since the brake pedal feel has changed. While the vehicle may still brake, the ABS system is compromised, which can affect emergency braking performance. A professional can accurately diagnose the issue using specialized tools, perform necessary repairs, and ensure your braking system is safe and fully functional. Do not delay, as braking system issues are critical for safety.

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