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2017 S90 T6 - ABS/Traction Control Light On, Brake Pedal Feels Spongy

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Tom H. · rep 0 · May 22, 5:10 AM · 1 replies · solved · Question

Vehicle: 2017 Volvo S90 T6

Hey everyone,

My 2017 Volvo S90 T6, with about 60,000 miles, just lit up with both the ABS and Traction Control warning lights on the dash. Simultaneously, the brake pedal feels a bit spongy, and I'm concerned about braking performance.

I haven't noticed any specific issues leading up to this, no hard braking or anything. I checked the brake fluid reservoir, and it seems to be at the correct level. Could this be a wheel speed sensor issue, or something more serious with the ABS module itself?

Has anyone else experienced this combination of lights and brake feel on their S90? Any diagnostic tips or common fixes would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:10 AM

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ClearTheCode admin answer:

The simultaneous illumination of the ABS and Traction Control lights, coupled with a spongy brake pedal on your 2017 Volvo S90 T6, indicates a problem within the braking or stability control system. This requires immediate attention due to safety concerns. Here's what could be happening:

  1. Wheel Speed Sensors:

    • Cause: A faulty wheel speed sensor (also known as an ABS sensor) is a very common cause for both ABS and Traction Control lights. If the system can't accurately read wheel speed, it can't function correctly.
    • Action: While a common culprit, a faulty sensor typically doesn't cause a spongy pedal directly. However, if the system is disabled, you might perceive a difference. A diagnostic scan will usually show a specific code (e.g., C0031 for front left wheel speed sensor).

  2. ABS Module Failure:

    • Cause: The ABS control module is the brain of the system. A failing module, either internally or due to a wiring issue, can cause widespread errors and disable both ABS and Traction Control.
    • Action: This is a more serious and costly repair. A professional diagnostic tool is needed to communicate with the ABS module and check for internal fault codes.

  3. Brake Fluid Contamination or Air in the System:

    • Cause: While you checked the level, contaminated fluid or air introduced into the brake lines (perhaps during a recent brake service if applicable) can lead to a spongy pedal and potentially trigger system warnings.
    • Action: A brake fluid flush and bleed might be necessary. This should be done by a professional, especially on modern ABS systems that may require a scan tool to cycle the ABS pump during bleeding.

  4. Master Cylinder or Brake Booster Issue:

    • Cause: Less likely to trigger ABS/Traction Control lights directly, but a failing master cylinder or brake booster can cause a spongy pedal or reduced braking power.
    • Action: These components should be inspected by a mechanic if other causes are ruled out.

When to See a Shop: Given the safety implications of compromised braking, you should have your S90 inspected by a Volvo dealership or a qualified independent mechanic as soon as possible. They can perform a comprehensive diagnostic scan to retrieve specific fault codes from the ABS module, which is crucial for accurate diagnosis. Do not delay this repair.

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