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C1406 Toyota Code - Open or Short in Front Speed Sensor Left Circuit

Quick Answer

The C1406 diagnostic trouble code (DTC) for Toyota vehicles indicates an open or short circuit in the front speed sensor left circuit. Common causes include Damaged or corroded wiring harness leading to the front left speed sensor, Faulty front left wheel speed sensor, Loose or disconnected connector at the speed sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1406 Toyota indicates Open or Short in Front Speed Sensor Left Circuit.
Common causes
Common causes include Damaged or corroded wiring harness leading to the front left speed sensor, Faulty front left wheel speed sensor, Loose or disconnected connector at the speed sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code C1406 Toyota Description

The C1406 diagnostic trouble code (DTC) for Toyota vehicles indicates an open or short circuit in the front speed sensor left circuit. This code specifically pertains to the front left wheel speed sensor, which is a crucial component of the vehicle's anti-lock braking system (ABS) and traction control system. The speed sensor is responsible for monitoring the rotational speed of the wheel and sending this information to the ABS control module. If there is an open or short circuit in the sensor's wiring or connector, it can lead to inaccurate or no signal being sent to the ABS module, causing various issues with the vehicle's braking and stability control systems.

OBDII Code C1406 Toyota - Open or Short in Front Speed Sensor Left Circuit
C1406 Toyota Code - Open or Short in Front Speed Sensor Left Circuit

Common Causes of C1406 Toyota

  1. Damaged or corroded wiring harness leading to the front left speed sensor
  2. Faulty front left wheel speed sensor
  3. Loose or disconnected connector at the speed sensor
  4. Water or debris intrusion into the sensor or wiring
  5. Issues with the ABS control module

Symptoms of C1406 Toyota

  1. ABS warning light illuminated on the dashboard
  2. Loss of ABS functionality
  3. Traction control system disabled
  4. Increased stopping distance during braking
  5. Unstable handling or steering during braking or cornering

How to Fix C1406 Toyota

  1. Begin by visually inspecting the wiring harness and connector leading to the front left wheel speed sensor for any damage, corrosion, or loose connections. Repair or replace any damaged components.
  2. Use a multimeter to test the continuity of the wiring harness and sensor connections to identify any open or short circuits. Repair or replace any faulty wiring.
  3. Test the front left wheel speed sensor with a multimeter to check for proper resistance values. Replace the sensor if it is out of specifications.
  4. Clear the DTC codes using a scan tool and test drive the vehicle to ensure the ABS and traction control systems are functioning properly.
  5. If the issue persists, further diagnostics may be required to identify any underlying problems with the ABS control module or other related components.

Cost to Fix C1406 Toyota

The cost of repairing an open or short in the front speed sensor left circuit can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the cost of parts such as a new wheel speed sensor and wiring harness can range from $100 to $300, while labor costs can range from $100 to $300 or more. Overall, the total repair cost for this issue may be in the range of $200 to $600, including parts and labor. It is advisable to consult with a trusted mechanic or dealership for a more accurate cost estimate based on the specific vehicle make and model. Keep in mind that diagnostic time and labor rates can vary based on location and other factors.

What does this mean?

Tech Notes for C1406 Toyota

Start by checking passenger side wheel speed sensor for physical damage.





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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1406 Toyota Code

1. What does the OBDII code C1406 mean on a Toyota?

C1406 indicates an open or short circuit in the front left speed sensor wiring or circuit, which is part of the ABS system.

2. What are the common symptoms of C1406 on a Toyota?

Symptoms may include the ABS warning light being illuminated, loss of ABS function, or reduced braking performance.

3. What causes the C1406 code to appear?

Common causes include a faulty front left wheel speed sensor, damaged wiring, corroded connectors, or issues with the ABS control module.

4. Can I still drive my Toyota with a C1406 code?

You can drive, but the ABS system may not function properly, increasing the risk of skidding or loss of control during hard braking.

5. How do I diagnose the C1406 code?

Diagnosis involves inspecting the front left speed sensor, checking for damaged wiring, testing the sensor's resistance, and ensuring proper connectivity.

6. How do I fix the C1406 code on my Toyota?

Repairs may include replacing the front left speed sensor, repairing or replacing damaged wiring, or cleaning corroded connectors.

7. How much does it cost to fix the C1406 code?

Repair costs vary but typically range from $100 to $300, depending on whether you need to replace the sensor or repair wiring.

8. Can a dirty wheel hub cause the C1406 code?

Yes, debris or buildup around the wheel hub can interfere with the speed sensor's readings, potentially triggering the code.

9. Will clearing the C1406 code fix the problem?

Clearing the code may temporarily turn off the warning light, but the underlying issue must be resolved to prevent the code from returning.

10. Is the C1406 code related to other ABS codes?

Yes, it may be accompanied by other ABS-related codes if there are additional issues within the braking system.

Discuss the causes and fixes for C1406 Toyota OBDII Code

Submit a New Comment

  • Yes I replaced the left front speed sensor and I'm still getting open/ circuit fault c1406

    Reply to Comment

  • Let me check the service manual for more information. What model and year is your vehicle?

    Reply to Comment