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ABS and Traction Control Lights On - 2017 Tacoma TRD Off-Road

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Eric V. · rep 0 · May 22, 2:15 AM · 1 replies · solved · Question

Vehicle: 2017 Toyota Tacoma TRD Off-Road

Hey everyone,

My 2017 Toyota Tacoma TRD Off-Road recently had both the ABS light and the Traction Control (TRAC OFF) light come on simultaneously. They've been on for a couple of days now and won't turn off. There's no Check Engine Light, and the truck seems to be driving normally, though I haven't tried to engage ABS or traction control since the lights came on.

I've checked the brake fluid level, and it's fine. I also tried disconnecting the battery for a few minutes, but the lights came right back on. I'm wondering if it could be a wheel speed sensor or something more serious.

Has anyone else experienced this on their Tacoma or another Toyota truck? What was the fix? Any advice on what to check or what common codes might be associated with this problem would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:15 AM

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ClearTheCode admin answer:

When both the ABS and Traction Control (TRAC OFF) lights illuminate on your 2017 Toyota Tacoma TRD Off-Road, it typically indicates a fault within the Anti-lock Braking System (ABS) that also affects the vehicle's stability control systems. Since these systems rely on similar sensors and control modules, a fault in one often disables the others.

Here are the most common causes and diagnostic steps:

  1. Wheel Speed Sensors: This is the most frequent culprit. Each wheel has a speed sensor that monitors its rotation. If a sensor is dirty, damaged, or its wiring is faulty, the ABS module won't receive accurate speed data, leading to these warning lights. Off-roading can sometimes damage these sensors or their wiring. A scan tool capable of reading ABS codes (not just engine codes) can pinpoint which sensor is at fault (e.g., C0031 for front left, C0034 for front right, etc.).
  2. ABS Tone Ring/Reluctor Ring: These are toothed rings that the wheel speed sensors read. If a tone ring is cracked, bent, or corroded, it can cause erratic readings, triggering the lights.
  3. Brake Light Switch: A faulty brake light switch can sometimes cause these lights to come on, as the ABS system uses its input. Check if your brake lights are functioning correctly.
  4. ABS Module Failure: Less common, but the ABS control module itself can fail. This is usually a more expensive repair and would typically be diagnosed after ruling out simpler issues.
  5. Low Brake Fluid (already checked): While you've checked this, it's a common cause. Ensure it's at the MAX line.

When to see a shop:

  • If you don't have an advanced OBD-II scanner that can read ABS-specific codes. Generic scanners often only read powertrain codes (P-codes).
  • If visual inspection of the wheel speed sensors and their wiring (look for cuts, fraying, or dirt) doesn't reveal an obvious issue.
  • If the problem persists after checking the basics. Diagnosing ABS issues often requires specific tools and knowledge to ensure the braking system's integrity.
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