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ABS and VSA warning lights on my 2017 MDX SH-AWD

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Mike T. · rep 0 · May 25, 3:41 AM · 1 replies · solved · Question

Vehicle: 2017 Acura MDX SH-AWD

Hello ClearTheCode community,

I'm having an issue with my 2017 Acura MDX SH-AWD. Recently, the ABS and VSA (Vehicle Stability Assist) warning lights illuminated on my dashboard, and they've stayed on. I haven't noticed any immediate changes in braking performance or handling, but it's concerning to see these critical lights on.

I tried turning the car off and on, but the lights remain. I'm wondering if this is a common issue with these models and what might be causing it. Could it be a wheel speed sensor, or something more serious with the ABS module itself?

Any insights or diagnostic steps would be greatly appreciated before I head to the dealership.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:41 AM

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ClearTheCode admin answer:

When both the ABS and VSA warning lights illuminate on your 2017 Acura MDX SH-AWD, it indicates a fault within the anti-lock braking system or the vehicle stability assist system, which are interconnected. While you might not feel an immediate change in normal driving, these systems are crucial for emergency braking and stability control.

Common Causes:

  1. Wheel Speed Sensors: These are the most common cause. A dirty, damaged, or faulty wheel speed sensor (one at each wheel) will prevent the ABS/VSA module from accurately monitoring wheel rotation, leading to a fault. OBD-II codes like C1100 (ABS Pump Motor Failure) or C1101 (ABS Pump Motor Stuck ON) can sometimes point to related issues, but often specific wheel speed sensor codes (e.g., C10XX range) are present.
  2. ABS Module Failure: Less common but possible, the ABS control module itself can fail, leading to system errors.
  3. Wiring Issues: Damaged wiring or connectors to the wheel speed sensors or the ABS module can interrupt signals.
  4. Low Brake Fluid: Extremely low brake fluid can sometimes trigger these lights, though usually, the brake warning light would also be on.
  5. Brake Light Switch: A faulty brake light switch can sometimes cause VSA issues.

Steps to Diagnose:

  1. Check Brake Fluid: Ensure your brake fluid reservoir is at the correct level.
  2. OBD-II Scan: The most critical first step is to connect an OBD-II scanner capable of reading ABS/VSA specific codes. Generic scanners might only show powertrain codes, but a more advanced scanner will pull codes directly related to the ABS/VSA system, often pointing to a specific wheel speed sensor (e.g., C1010 for front left wheel speed sensor).
  3. Visual Inspection: If a wheel speed sensor code is present, visually inspect the sensor and its wiring at that wheel for any damage, dirt, or loose connections.

When to See a Shop:

Because the ABS and VSA systems are vital for safety, it's highly recommended to have your 2017 Acura MDX SH-AWD inspected by a professional mechanic or dealership as soon as possible. They have specialized diagnostic tools to accurately read the fault codes and perform a thorough diagnosis, ensuring the problem is correctly identified and repaired. Driving with these lights on means your vehicle's advanced safety features may not function in an emergency.

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