Car ABS and Traction Control Lights On 2017 Toyota Sequoia

Experiencing the Car ABS and Traction Control Lights On in your 2017 Toyota Sequoia can be concerning, as these illuminated dashboard warnings indicate a potential issue with critical safety systems. When both lights appear, it typically means the Anti-lock Braking System (ABS) and Traction Control (TRAC) are disabled, which can affect your vehicle's ability to maintain control during sudden stops or on slippery surfaces. This guide will help you understand the common causes, diagnose the problem, and explore the necessary steps to get your Sequoia's safety features back online.

What drivers notice on this 2017 Toyota Sequoia

• When driving, the ABS (Anti-lock Braking System) warning light illuminates on the dashboard.
• Simultaneously, the Traction Control (TRAC) light also turns on, often accompanied by the VSC (Vehicle Stability Control) light.
• The vehicle's braking performance might feel normal, but the advanced safety features are disabled.
• In some cases, a slight grinding or pulsing sensation might be felt during braking, even under normal conditions.
• The cruise control system may become inoperable.

At a glance: difficulty, repair cost, and diagnostic workflow

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: Illuminated ABS warning light: This is the primary indicator of a fault in the anti-lock braking system.; Illuminated Traction Control (TRAC) light: Often accompanies the ABS light, indicating the traction control system is al; Illuminated VSC (Vehicle Stability Control) light: Frequently appears with ABS and TRAC lights, signifying a problem aff; Loss of ABS function: Wheels may lock up under hard braking, especially on slippery surfaces.
• Estimated Repair Cost: $150–$1,100 (parts + typical shop labor)
• OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

Symptoms and warning signs

• Illuminated ABS warning light: This is the primary indicator of a fault in the anti-lock braking system.
• Illuminated Traction Control (TRAC) light: Often accompanies the ABS light, indicating the traction control system is also offline.
• Illuminated VSC (Vehicle Stability Control) light: Frequently appears with ABS and TRAC lights, signifying a problem affecting vehicle stability.
• Loss of ABS function: Wheels may lock up under hard braking, especially on slippery surfaces.
• Loss of traction control: Wheels may spin freely during acceleration on loose or wet surfaces.
• Cruise control not working: A common secondary symptom when these safety systems are compromised.
• Erratic speedometer readings: Less common, but can occur if a wheel speed sensor is faulty.
• A slight pulsation or vibration in the brake pedal: Sometimes felt if an ABS sensor is sending incorrect signals.

How to verify and confirm the issue

When your 2017 Toyota Sequoia shows Car ABS and Traction Control Lights On, confirming the root cause is crucial. Here's how to verify and pinpoint the problem:

• Dashboard Lights: Visually confirm that both the ABS and TRAC/VSC lights are illuminated. This is the primary symptom.
• OBD-II Scan Tool: Connect an OBD-II scanner capable of reading ABS/SRS codes (not just generic powertrain codes). Look for specific diagnostic trouble codes (DTCs) related to the ABS system. A common code associated with this issue is C0031, indicating a problem with the front left wheel speed sensor circuit. Other codes might point to different wheel speed sensors, the ABS module, or wiring issues.
• Live Data Stream: Use the scan tool to monitor live data from each wheel speed sensor while driving. Look for discrepancies in speed readings between sensors. A faulty sensor might show zero speed, intermittent readings, or significantly different speeds compared to the others.
• Visual Inspection:
  • Inspect each wheel speed sensor and its wiring harness for visible damage, corrosion, or loose connections.
  • Check the ABS tone ring (reluctor ring) on the axle or hub for cracks, missing teeth, or debris accumulation.
  • Examine brake fluid levels and condition, though this is less directly related to ABS/TRAC lights unless extremely low.
  • Look for any signs of recent brake work that might have damaged a sensor or its wiring.

Common causes (most likely first)

• Faulty Wheel Speed Sensor: This is by far the most common culprit. Sensors can fail due to dirt, debris, corrosion, physical damage, or internal electrical faults. Each wheel has its own sensor.
• Damaged Wheel Speed Sensor Wiring: The wiring harness connecting the sensor to the ABS module can fray, get pinched, or suffer from corrosion, interrupting the signal.
• Contaminated or Damaged ABS Tone Ring (Reluctor Ring): The tone ring, which the wheel speed sensor reads, can become clogged with rust or debris, or sustain physical damage (e.g., bent or missing teeth), leading to inaccurate readings.
• Faulty ABS Module: The ABS control module itself can fail, either internally or due to software glitches. This is less common than sensor issues but can be more expensive to repair.
• Low Brake Fluid Level: While not a direct cause for ABS/TRAC lights, extremely low brake fluid can trigger a general brake warning light, which might be confused with ABS issues or indicate a system leak affecting overall braking.
• Blown ABS Fuse: A dedicated fuse protects the ABS system. If it blows, the system loses power.
• Steering Angle Sensor Malfunction: Less common, but a faulty steering angle sensor can affect the VSC system, which is integrated with ABS and traction control, potentially triggering related lights.

Related guides on this vehicle

• AC Blowing Hot Air When Car Is Idling 2017 Toyota Land Cruiser
• Car Won't Start, No Click, No Crank 2017 Toyota Rav4 Diagnosis
• Car No Crank, No Start, No Lights on Dashboard 2020 Toyota Rav4

Step-by-step diagnosis and fixes

Addressing the Car ABS and Traction Control Lights On on your 2017 Toyota Sequoia requires a systematic approach. Follow these steps to diagnose and potentially fix the issue:

1. Read Diagnostic Trouble Codes (DTCs): Use an ABS-capable scan tool to retrieve codes. This is the starting point, as codes like C0031 (Front Left Wheel Speed Sensor Circuit) will direct your diagnosis.
2. Visual Inspection of Wheel Speed Sensors and Wiring:
   • Jack up the vehicle safely and remove the wheels.
   • Inspect each wheel speed sensor, its connector, and the wiring harness leading from it. Look for cuts, corrosion, fraying, or loose connections.
   • Clean any dirt or debris from the sensors and tone rings.
3. Test Wheel Speed Sensors:
   • Resistance Test: Disconnect the sensor and use a multimeter to check its resistance. Compare readings to OEM specifications (often found in service manuals or online resources like those found at All repair guides).
   • AC Voltage Test (for passive sensors): Spin the wheel by hand and check for a small AC voltage signal from the sensor.
   • Live Data Monitoring: As mentioned in verification, monitor live data while driving to identify which sensor is providing erratic or no readings.
4. Inspect ABS Tone Rings: Carefully examine the tone rings (reluctor rings) on the axles or hubs. Ensure they are clean, free of rust buildup, and have no missing or damaged teeth.
5. Check ABS Fuses: Locate the ABS fuses in the under-hood fuse box and possibly inside the cabin. Use a test light or multimeter to check for continuity. Replace any blown fuses.
6. Check Brake Fluid Level: Ensure the brake fluid reservoir is filled to the appropriate level. Top off if necessary, and inspect for leaks if the level was significantly low.
7. Diagnose ABS Module (if all else fails): If sensors, wiring, and tone rings check out, and you have codes pointing to the module, further diagnosis or replacement of the ABS module might be necessary. This often requires specialized equipment for programming.
8. Clear Codes and Test Drive: After any repair, clear the DTCs with your scan tool and take the Sequoia for a test drive to confirm the lights remain off and the systems are functioning correctly.

Repair options and cost factors

Repairing the Car ABS and Traction Control Lights On on your 2017 Toyota Sequoia can range from simple to complex, impacting cost.

• Wheel Speed Sensor Replacement: This is often the most straightforward and common repair.
  • DIY Cost: ~$50-$200 per sensor for parts.
  • Professional Cost: ~$150-$400 per sensor, including parts and labor.
• Wiring Repair: If only a section of wiring is damaged, it might be spliced and repaired.
  • DIY Cost: Minimal, just connectors and wire.
  • Professional Cost: ~$100-$300 depending on complexity and location.
• ABS Tone Ring Replacement: Can be more involved, often requiring hub or axle removal.
  • DIY Cost: ~$30-$150 for the part.
  • Professional Cost: ~$200-$600, as it's labor-intensive.
• ABS Module Repair/Replacement: This is the most expensive option. Some modules can be repaired by specialized services, while others require full replacement.
  • DIY Cost: ~$300-$1000 for a remanufactured or used module, plus potential programming tools.
  • Professional Cost: ~$800-$2,500+, including parts, labor, and programming. This cost can vary significantly depending on whether a new or remanufactured module is used. For more details on related issues, you might consult resources like Related OBD-II code reference.
• Other Minor Repairs: Fuses are very inexpensive (a few dollars). Brake fluid top-off is also minimal.

When to see a professional

While many DIY enthusiasts can tackle wheel speed sensor replacement, there are situations where professional help is advisable:

• Persistent Lights After Basic Checks: If you've replaced a sensor and the lights remain on, or if you're getting multiple, confusing codes.
• ABS Module Diagnosis/Replacement: This is a complex job that often requires specialized diagnostic tools and programming equipment that most home mechanics don't possess. Incorrect installation or programming can lead to further issues.
• Lack of Specialized Tools: If you don't have an ABS-capable scan tool, a multimeter, or the necessary jacks and stands to safely work on your vehicle.
• Uncertainty About Diagnosis: If you're unsure about the exact cause or uncomfortable performing the required tests.
• Safety Concerns: Any work involving the braking system is safety-critical. If you're not confident in your abilities, it's always best to consult a qualified technician. For broader automotive insights, check out Browse vehicles.

Frequently asked questions

Can I drive my 2017 Toyota Sequoia with the ABS and Traction Control lights on?

While your Sequoia will still brake, the anti-lock braking system and traction control will be disabled. This means your wheels could lock up under hard braking, and you might experience wheel spin on slippery surfaces, increasing the risk of an accident. It's generally not recommended to drive for extended periods without these safety features.

Will a faulty wheel speed sensor affect my speedometer?

Yes, in some cases, a faulty wheel speed sensor can affect your speedometer. The speedometer often relies on a signal from one of the wheel speed sensors (typically the front left or a combination of them) to calculate vehicle speed. If this sensor is failing or providing erratic data, it can lead to an inaccurate or non-functional speedometer.

How do I reset the ABS and Traction Control lights on my 2017 Toyota Sequoia?

The lights will typically reset automatically once the underlying fault is repaired and the system detects normal operation. You can also use an OBD-II scan tool to clear the diagnostic trouble codes, which will turn off the lights temporarily. However, if the fault is still present, the lights will illuminate again shortly after driving.

Sources and further reading

• All repair guides
• Browse vehicles
• Related OBD-II code reference
• Related topic hub

Disclaimer: This information is for educational purposes only and is not a substitute for OEM service procedures. Always use a qualified technician for safety-critical work.

Explore related guides on ClearTheCode

• Browse OBD-II codes
• All repair guides