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C1408 Lexus Code - Open Or Short In Rear Speed Sensor Left Circuit

Quick Answer

The C1408 diagnostic trouble code for Lexus vehicles indicates an open or short in the rear speed sensor left circuit. Common causes include Damaged wiring or connectors in the rear left speed sensor circuit, Faulty rear left speed sensor, Malfunctioning electronic control module (ECM). 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
C1408 Lexus indicates Open Or Short In Rear Speed Sensor Left Circuit.
Common causes
Common causes include Damaged wiring or connectors in the rear left speed sensor circuit, Faulty rear left speed sensor, Malfunctioning electronic control module (ECM).
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 17, 2024
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Code C1408 Lexus Description

The C1408 diagnostic trouble code for Lexus vehicles indicates an open or short in the rear speed sensor left circuit. This means that there is an issue with the electrical circuit that connects the rear left speed sensor to the vehicle's electronic control module (ECM). The speed sensor is responsible for measuring the speed of the wheel and sending this information to the ECM, which uses it for various vehicle control functions such as anti-lock braking system (ABS) operation and traction control.

OBDII Code C1408 Lexus - Open Or Short In Rear Speed Sensor Left Circuit
C1408 Lexus Code - Open Or Short In Rear Speed Sensor Left Circuit

Common Causes of C1408 Lexus

  1. Damaged wiring or connectors in the rear left speed sensor circuit
  2. Faulty rear left speed sensor
  3. Malfunctioning electronic control module (ECM)
  4. Corrosion or contamination in the sensor connections
  5. Physical damage to the sensor or its mounting location

Symptoms of C1408 Lexus

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction
  3. Erratic or inaccurate speedometer readings
  4. Increased stopping distances
  5. Vehicle stability issues during braking or cornering

How to Fix C1408 Lexus

  1. Begin by visually inspecting the wiring and connectors in the rear left speed sensor circuit for any signs of damage or corrosion.
  2. Test the rear left speed sensor using a multimeter to check for proper resistance and continuity.
  3. If the sensor is faulty, replace it with a new one and ensure proper installation.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be necessary to identify any underlying issues with the ECM or other components.

Cost to Fix C1408 Lexus

The typical repair costs for addressing an open or short in the rear speed sensor left circuit can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a faulty speed sensor can range from $100 to $300, while addressing wiring or connector issues may cost between $50 and $150. Labor costs can add an additional $100 to $200 to the total repair bill. It's important to note that these are rough estimates, and actual costs may vary based on the vehicle's make and model, as well as the rates charged by individual auto repair shops. It's recommended to obtain quotes from local shops to get a more accurate cost estimate for this repair.

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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 C1408 Lexus Code

1. What are the common symptoms of OBDII code C1408 in a Lexus related to an open or short in the rear speed sensor left circuit?

The common symptoms include ABS warning light illuminating on the dashboard, traction control system malfunction, and potential loss of stability control.

2. What are the possible causes of OBDII code C1408 in a Lexus?

Possible causes include damaged wiring or connectors in the rear speed sensor left circuit, a faulty rear speed sensor, or issues with the ABS control module.

3. How can I diagnose the source of the open or short in the rear speed sensor left circuit in my Lexus?

You can use a multimeter to test the continuity of the wiring and connectors, inspect the sensor for physical damage, and perform a scan tool diagnostic to pinpoint the issue.

4. Can driving with OBDII code C1408 present cause further damage to my Lexus?

Continuing to drive with this code may lead to compromised ABS and stability control functionality, potentially affecting the vehicle's overall safety and performance.

5. What is the typical repair process for resolving OBDII code C1408 in a Lexus?

The repair process usually involves repairing or replacing damaged wiring or connectors, replacing the faulty rear speed sensor if necessary, and clearing the trouble codes from the ABS control module.

6. Are there any DIY tips for troubleshooting OBDII code C1408 in a Lexus?

While basic inspections and continuity tests can be done by DIY enthusiasts, it's recommended to consult a professional mechanic for a comprehensive diagnosis and repair to ensure proper functionality.

7. How much does it cost to fix OBDII code C1408 in a Lexus at a repair shop?

The cost of fixing this issue can vary depending on the extent of the damage, parts needed for replacement, and labor fees, but it typically ranges from $200 to $500.

8. Will resetting the trouble codes make OBDII code C1408 disappear permanently?

Resetting the trouble codes may temporarily clear the warning lights, but if the underlying issue causing OBDII code C1408 is not addressed, the code is likely to reappear once the system detects the problem again.

9. Can extreme weather conditions affect the rear speed sensor left circuit in a Lexus and trigger OBDII code C1408?

Extreme weather conditions, such as excessive heat or moisture, can potentially damage the wiring or components in the sensor circuit, leading to the triggering of OBDII code C1408.

10. Is it safe to drive my Lexus with OBDII code C1408 if the ABS and traction control functions are affected?

Driving with compromised ABS and traction control functions can pose safety risks, especially in emergency braking or slippery road conditions, so it's advisable to have the issue addressed by a qualified technician promptly.

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