The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

ABS Light On & Spongy Brake Pedal on 2018 Outlander Sport

0

Chris P. · rep 0 · May 22, 5:32 AM · 1 replies · solved · Question

Vehicle: 2018 Mitsubishi Outlander Sport ES

Hey everyone,

I've got a weird issue with my 2018 Mitsubishi Outlander Sport ES. The ABS warning light came on a few days ago, and ever since, the brake pedal feels really spongy. It goes down a lot further than it used to before the brakes engage properly. I'm a bit worried about driving it like this.

I checked the brake fluid reservoir, and it looks full. There are no visible leaks around the calipers or lines that I can see. Could this be a sensor issue, or something more serious with the ABS module itself? Has anyone else experienced this with their Outlander Sport?

Any advice on what I should check next or if this is a common problem would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:32 AM

0

ClearTheCode admin answer:

An illuminated ABS light combined with a spongy brake pedal on your 2018 Mitsubishi Outlander Sport ES indicates a significant issue within your braking system that requires immediate attention. This is not just a sensor problem; the spongy pedal suggests a loss of hydraulic pressure or air in the system.

Here's a breakdown of potential causes and steps:

  1. Check for Diagnostic Trouble Codes (DTCs): The first step is to get the vehicle scanned for ABS-related OBD-II codes. Common codes might include:
    • C0020: ABS Pump Motor Control Circuit Malfunction
    • C0031-C0034: Wheel Speed Sensor Circuit Malfunction (for specific wheels)
    • C0040: Brake Pedal Position Sensor Circuit Malfunction
    • C0050: ABS Valve Relay Malfunction
  2. Potential Causes:
    • Air in the Brake Lines: This is a common cause of a spongy pedal. Air can enter the system through a leak or improper bleeding after a component replacement. Even without visible leaks, a very small breach can allow air in.
    • Master Cylinder Failure: The master cylinder is responsible for generating hydraulic pressure. Internal seals can wear out, allowing fluid to bypass, leading to a spongy pedal and reduced braking effectiveness.
    • ABS Hydraulic Control Unit (HCU) Malfunction: The HCU contains valves and a pump that regulate brake pressure. A fault here can cause both the ABS light and a spongy pedal. This is often indicated by specific ABS codes.
    • Brake Fluid Contamination or Low Fluid: While you mentioned the reservoir is full, contaminated fluid can affect performance. A very slow leak might not be immediately visible but could still introduce air or lower fluid over time.
    • Damaged Brake Lines or Hoses: A bulging or compromised brake hose can expand under pressure, leading to a spongy feel.

When to See a Shop: Given the combination of an ABS light and a spongy brake pedal, it is critical to have your vehicle inspected by a qualified mechanic immediately. Do not delay. Driving with compromised brakes is extremely dangerous. A professional shop will be able to:

  • Accurately diagnose the specific fault using advanced diagnostic tools.
  • Perform a thorough inspection of the entire braking system, including lines, calipers, master cylinder, and ABS components.
  • Bleed the brake system properly to remove any air.
  • Replace any faulty components, such as the master cylinder, ABS module, or wheel speed sensors, as needed.
Menu

Help & account