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2021 TLX VSA Light On, ABS Light On - Brake Pedal Feels Spongy

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Mark S. · rep 0 · May 22, 4:54 AM · 1 replies · solved · Question

Vehicle: 2021 Acura TLX A-Spec

Hi everyone,

I'm experiencing a concerning issue with my 2021 Acura TLX A-Spec. Both the VSA (Vehicle Stability Assist) light and the ABS (Anti-lock Braking System) light have come on simultaneously on my dashboard. On top of that, the brake pedal feels noticeably softer or spongy, and I feel like I have to press it further to get the car to stop.

I haven't hit any potholes or had any recent brake work done. The car has about 35,000 miles. Could this be a wheel speed sensor, or something more serious with the ABS module itself? I'm worried about driving it with compromised braking.

Any insights or similar experiences with the newer TLX models would be helpful. What should I check first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:54 AM

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ClearTheCode admin answer:

The simultaneous illumination of the VSA and ABS warning lights, coupled with a spongy brake pedal, on your 2021 Acura TLX A-Spec is a critical issue that requires immediate attention. These systems are interconnected, and a fault in one often affects the other. The spongy pedal suggests a potential hydraulic issue or a problem with the ABS modulator.

Here's a breakdown of potential causes and diagnostic steps:

  1. Brake Fluid Level and Condition: Check your brake fluid reservoir. A low fluid level could indicate a leak in the system, which would explain the spongy pedal. Also, inspect the fluid for contamination or extreme darkness.
  2. Brake System Leaks: Carefully inspect all brake lines, calipers, and the master cylinder for any signs of fluid leaks. Even a small leak can introduce air into the system, leading to a spongy pedal.
  3. Wheel Speed Sensors: A faulty wheel speed sensor is a common cause for ABS/VSA lights. If a sensor isn't providing accurate data, the system can't function correctly. However, a faulty sensor typically doesn't directly cause a spongy pedal unless it's part of a larger ABS module failure. A scan tool can read specific wheel speed sensor codes (e.g., C1000 series).
  4. ABS Modulator/Pump Assembly: This is a more serious and potentially costly component. If there's an internal fault with the ABS modulator or its pump, it can affect brake pressure and trigger both lights. This often requires specialized diagnostic equipment to confirm.
  5. Master Cylinder: A failing master cylinder can also cause a spongy pedal as it may not be building or holding pressure effectively. This is less likely to directly trigger ABS/VSA lights unless it's causing a significant pressure differential.

When to See a Shop:

  • Immediately. Do not delay. Driving with compromised braking is extremely dangerous. Have the vehicle towed to a reputable service center or Acura dealership.
  • A professional technician can use an advanced diagnostic scanner to retrieve specific ABS/VSA fault codes, which are crucial for pinpointing the exact problem.
  • They can perform a thorough inspection of the entire braking system, including pressure tests, to identify leaks, master cylinder issues, or ABS modulator faults.
  • Brake system repairs, especially those involving ABS or master cylinder, require specialized knowledge and tools to ensure proper bleeding and functionality.
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