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2017 Impreza: ABS, Traction Control, and VDC Lights On

0

Kevin B. · rep 0 · May 22, 3:15 AM · 1 replies · solved · Question

Vehicle: 2017 Subaru Impreza Sport

Hello forum,

I'm having an issue with my 2017 Subaru Impreza Sport (manual transmission) that just popped up. While driving yesterday, the ABS light, Traction Control light, and the VDC (Vehicle Dynamics Control) light all illuminated on my dashboard. They came on simultaneously and have stayed on since.

I haven't noticed any immediate changes in braking performance or handling, but it's definitely concerning to have these safety systems disabled. I tried turning the car off and on, but the lights remain. Has anyone experienced this with their Impreza or other Subaru models? What should I be looking for, and could this be a simple fix or something more complex?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:15 AM

0

ClearTheCode admin answer:

The simultaneous illumination of the ABS, Traction Control, and VDC lights on your 2017 Subaru Impreza is a common indication that there's an issue within the vehicle's braking and stability control systems. These systems are interconnected, so a fault in one often triggers warnings for the others.

Common Causes:

  1. Wheel Speed Sensor Failure: This is the most frequent cause. Each wheel has a sensor that monitors its rotational speed. If a sensor fails, becomes dirty, or its wiring is damaged, the ABS and VDC systems lose crucial data, triggering the lights. Common OBD-II codes related to this include C0031 (Front Left Wheel Speed Sensor), C0034 (Front Right Wheel Speed Sensor), C0037 (Rear Left Wheel Speed Sensor), C0040 (Rear Right Wheel Speed Sensor).
  2. ABS Module Failure: Less common but possible, the ABS control module itself can fail. This is a more expensive repair.
  3. Brake Light Switch: A faulty brake light switch can sometimes cause these lights to come on, as it provides input to the VDC system.
  4. Low Brake Fluid: While usually triggering a separate brake warning light, extremely low fluid can sometimes affect these systems.
  5. Wiring Issues: Damaged wiring or connectors to any of these components can also cause intermittent or constant warnings.

Troubleshooting Steps:

  1. Check Brake Fluid Level: Ensure your brake fluid reservoir is at the correct level.
  2. Visual Inspection: Look for any obvious damage to the wheel speed sensor wires, especially near the wheels, as they can be exposed to road debris.

When to See a Shop:

Because these lights indicate a fault in critical safety systems, it's important to have your Subaru professionally diagnosed as soon as possible. A mechanic will:

  • Scan for Diagnostic Trouble Codes (DTCs): This is the most crucial step. A professional scan tool can read the specific codes stored in the ABS/VDC module, which will pinpoint the exact sensor or component that is malfunctioning. Generic OBD-II scanners might not read all ABS-specific codes.
  • Inspect Wheel Speed Sensors: If codes point to a sensor, they will inspect the sensor and its tone ring for damage or debris.
  • Test Wiring and Connections: Check for continuity and proper voltage at the sensor and module connections.
  • Diagnose ABS Module: If all other components check out, they will test the ABS module itself.

While the car may seem to drive normally, the ABS, Traction Control, and VDC systems are disabled, meaning you won't have their assistance in emergency braking or slippery conditions. Get it checked for your safety.

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