AutoCodes – Generic – C1408

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

Quick Answer

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU (Brake Actuator Assembly). Common causes include Faulty Rear Speed Sensor Left, Rear Speed Sensor Left harness is open or shorted, Rear Speed Sensor Left circuit poor electrical connection. 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 indicates Open Or Short In Rear Speed Sensor Left Circuit.
Common causes
Common causes include Faulty Rear Speed Sensor Left, Rear Speed Sensor Left harness is open or shorted, Rear Speed Sensor Left circuit poor electrical connection.
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.
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Code Popularity 11,656
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jan 24, 2023
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Code C1408 Description

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU (Brake Actuator Assembly). These signals are used for Anti-Lock Brake System (ABS) control. Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn. Each speed sensor detects that magnetic change and sends a pulse signal to the Skid Control ECU (Brake Actuator Assembly).
OBDII Code C1408 - Open Or Short In Rear Speed Sensor Left Circuit - AutoCodes.com
C1408 Code - Open Or Short In Rear Speed Sensor Left Circuit

What are the Possible Causes of the DTC C1408?

  • Faulty Rear Speed Sensor Left
  • Rear Speed Sensor Left harness is open or shorted
  • Rear Speed Sensor Left circuit poor electrical connection
  • Faulty Skid Control ECU (Brake Actuator Assembly)

How to Fix the DTC C1408?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1408 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C1408 code?

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Need Help with the Code?

Get the C1408 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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 Code

1. What are the common symptoms of OBDII code C1408?

The common symptoms of OBDII code C1408 include issues with the ABS system, such as erratic speedometer readings, ABS warning light illumination, and potential loss of traction control.

2. What can cause the OBDII code C1408 to trigger?

The OBDII code C1408 is triggered when there is an open or short circuit in the rear speed sensor left circuit. This can be caused by damaged wiring, a faulty speed sensor, or a poor connection.

3. How can I diagnose the OBDII code C1408?

Diagnosing the OBDII code C1408 involves using a diagnostic scanner to read the fault codes stored in the ABS system. Additionally, inspecting the wiring and connections to the rear speed sensor left circuit is necessary to identify any issues.

4. What are some repair tips for fixing OBDII code C1408?

Repairing OBDII code C1408 may involve repairing or replacing damaged wiring, testing and replacing the rear speed sensor, and ensuring all connections are secure. It is also recommended to clear the fault codes after completing the repairs.

5. Can I drive my vehicle with OBDII code C1408?

It is not recommended to drive your vehicle with OBDII code C1408 present, as it indicates a potential issue with the ABS system, which is crucial for maintaining safe braking performance and traction control.

6. How serious is OBDII code C1408?

OBDII code C1408 should be taken seriously as it affects the functionality of the ABS system. Ignoring this code can lead to compromised safety features and potential braking issues.

7. Will OBDII code C1408 cause engine performance problems?

OBDII code C1408 is related to the ABS system and is unlikely to directly cause engine performance problems. However, resolving the issue promptly is important to maintain overall vehicle safety.

8. Can I reset OBDII code C1408 without fixing the underlying issue?

While you can clear the fault code temporarily, it will likely reappear if the underlying issue causing OBDII code C1408 is not resolved. It is recommended to address the root cause of the problem.

9. How much does it typically cost to repair OBDII code C1408?

The cost of repairing OBDII code C1408 can vary depending on the extent of the issue, the labor rates in your area, and the cost of any necessary parts. It is advisable to consult with a mechanic for an accurate estimate.

10. Is it possible to prevent OBDII code C1408 from occurring?

Regular maintenance, such as checking and maintaining the ABS system components, inspecting wiring for damage, and addressing any warning signs promptly, can help prevent OBDII code C1408 from occurring.

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