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Engine-Codes – Generic – U1408

U1408 Code - Implausible Brake Signal Received

Quick Answer

The U1408 code indicates that an implausible brake signal has been received by the vehicle's electronic control module (ECM). Common causes include Faulty brake pedal position sensor, Malfunctioning wheel speed sensors, Corrosion or damage to wiring or connectors in the brake system. 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
U1408 indicates Implausible Brake Signal Received.
Common causes
Common causes include Faulty brake pedal position sensor, Malfunctioning wheel speed sensors, Corrosion or damage to wiring or connectors in the brake system.
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 U1408 Description

The U1408 code indicates that an implausible brake signal has been received by the vehicle's electronic control module (ECM). This could mean that there is a discrepancy between the signals being sent by different components of the braking system, such as the brake pedal position sensor, wheel speed sensors, or brake fluid level sensor. When the ECM receives conflicting information regarding the status of the brakes, it may trigger this code to alert the driver to a potential issue.

OBDII Code U1408 - Implausible Brake Signal Received
U1408 Code - Implausible Brake Signal Received

Common Causes of U1408

  1. Faulty brake pedal position sensor
  2. Malfunctioning wheel speed sensors
  3. Corrosion or damage to wiring or connectors in the brake system
  4. Low brake fluid level or contaminated brake fluid
  5. ECM software or hardware issues

Symptoms of U1408

  1. Illumination of the brake warning light on the dashboard
  2. Delayed or unresponsive braking when the brake pedal is pressed
  3. ABS (anti-lock braking system) or stability control system malfunctions
  4. Inconsistent brake pedal feel or response

How to Fix U1408

  1. Begin by using a diagnostic scanner to retrieve and record the U1408 code, along with any other related codes that may be present.
  2. Inspect the brake pedal position sensor and wheel speed sensors for proper operation and connection. Replace any faulty sensors as needed.
  3. Check the wiring and connectors in the brake system for corrosion, damage, or loose connections. Repair or replace any damaged components.
  4. Verify the brake fluid level and quality, topping off or flushing the brake fluid as necessary.
  5. Clear the U1408 code from the ECM's memory using the diagnostic scanner, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix U1408

The cost of repairing an implausible brake signal code (U1408) can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the repair costs for this issue can range from $100 to $500, including parts and labor. Keep in mind that diagnostic time and labor rates can vary based on location, vehicle make and model, and engine type. It is recommended to contact local auto repair shops for a more accurate estimate.

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Code U1408 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 U1408 Code

1. What are the common symptoms of OBDII code U1408 (Implausible Brake Signal Received)?

- Common symptoms include malfunctioning brake lights, ABS warning light illuminated on the dashboard, and potential loss of communication with the brake system.

2. What are some possible causes of OBDII code U1408?

- Possible causes can include a faulty brake light switch, damaged wiring or connectors in the brake system circuit, or a problem with the ABS module.

3. How can I diagnose the issue related to OBDII code U1408?

- Diagnosis typically involves checking the brake light switch for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to communicate with the ABS module.

4. Can driving with OBDII code U1408 pose any risks?

- Driving with this code may lead to issues with brake light functionality and potentially affect the ABS system's performance, so it's advisable to address the problem promptly.

5. How can I repair OBDII code U1408?

- Repairing the code may involve replacing the brake light switch, repairing any damaged wiring or connectors, or recalibrating the ABS module to resolve the implausible brake signal issue.

6. Are there any DIY tips for troubleshooting OBDII code U1408?

- DIY troubleshooting tips include checking the brake light switch for proper adjustment, inspecting the brake system wiring for visible damage, and ensuring all connections are secure.

7. Can a mechanic help with diagnosing and repairing OBDII code U1408?

- Yes, a qualified mechanic can use advanced diagnostic tools to pinpoint the issue causing the implausible brake signal and perform the necessary repairs to resolve the code.

8. How long does it typically take to fix OBDII code U1408?

- The repair time can vary depending on the exact cause of the code and the complexity of the fix, but it usually takes a few hours to diagnose and repair the issue.

9. Will resetting the OBDII system clear code U1408?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the implausible brake signal remains unresolved, the code is likely to reappear.

10. Is it safe to continue driving with OBDII code U1408 until it's fixed?

- It's not recommended to drive with this code present, as it may indicate a problem with the brake system that could compromise safety. It's best to address the issue promptly.

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