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2017 Outlander SE - ABS & ASC Lights On, Erratic Speedometer

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Emily N. · rep 0 · May 22, 5:29 AM · 1 replies · solved · Question

Vehicle: 2017 Mitsubishi Outlander SE

Hi everyone,

I'm having a weird issue with my 2017 Mitsubishi Outlander SE. Both the ABS warning light and the ASC (Active Stability Control) warning light came on simultaneously on my dashboard. On top of that, my speedometer has started acting erratically – sometimes it drops to zero while I'm driving, then jumps back up, or just gives a completely inaccurate reading.

I haven't noticed any changes in braking performance, but the combination of these lights and the speedometer issue has me concerned. I don't have an OBD-II scanner that can read ABS codes, just a basic one for engine codes, and there's no Check Engine Light.

Could this be a wheel speed sensor, or something more serious like the ABS module? Any insights or similar experiences with your Outlander would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:29 AM

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ClearTheCode admin answer:

The simultaneous illumination of the ABS and ASC lights, combined with an erratic speedometer on your 2017 Mitsubishi Outlander SE, strongly points to an issue with one or more wheel speed sensors or the ABS control module. These systems are interconnected, as the ABS/ASC relies on accurate wheel speed data to function correctly, and the speedometer often derives its reading from one of the wheel speed sensors (typically the front left).

Here's a breakdown of common causes:

  1. Faulty Wheel Speed Sensor (ABS Sensor): This is the most common culprit. Each wheel has a sensor that monitors its rotational speed. If a sensor fails, becomes dirty, or its wiring is damaged, it can send incorrect or no data to the ABS module. This directly impacts ABS/ASC function and can cause an erratic speedometer if that sensor is the primary input for speed.
  2. Damaged ABS Sensor Wiring/Connector: The wiring harness leading to the wheel speed sensors can get damaged from road debris, corrosion, or simply wear and tear, leading to intermittent or complete signal loss.
  3. Dirty Sensor or Tone Ring: The wheel speed sensor reads a 'tone ring' (a toothed wheel) on the axle or hub. If this ring or the sensor itself becomes excessively dirty with metallic dust or debris, it can interfere with accurate readings.
  4. ABS Control Module Failure: While less common than sensor issues, the ABS control module itself can fail. This module processes the sensor data and controls the ABS/ASC systems. A fault here would affect all related functions.
  5. Wheel Bearing Issues: In some cases, a severely worn wheel bearing can cause excessive play, leading to an incorrect gap between the sensor and tone ring, or even damage to the sensor.

What to do next:

  • Visual Inspection: Carefully inspect the wheel speed sensors and their wiring at each wheel. Look for any visible damage, frayed wires, or excessive dirt/debris around the sensor and tone ring.
  • Check for Loose Connections: Ensure all sensor connectors are securely seated.

When to see a shop:

Since your basic OBD-II scanner won't read ABS-specific codes (C-codes), it's essential to take your Outlander to a mechanic or dealership that has a professional-grade scanner. They can connect to the ABS module and retrieve the specific fault codes, which will pinpoint exactly which sensor or component is causing the issue. Driving with non-functional ABS/ASC systems can compromise your vehicle's safety, especially in emergency braking or slippery conditions, so prompt diagnosis and repair are recommended.

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