AutoCodes – RAM – U1408 RAM

U1408 RAM Code - Implausible Brake Signal Received

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Body Control Module (BCM) receives an invalid signal from the Anti-lock Brake System (ABS) Module. Common causes include Faulty Anti-lock Brake System (ABS) Module, Anti-lock Brake System (ABS) Module harness is open or shorted, Anti-lock Brake System (ABS) Module 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: U1408 RAM indicates Implausible Brake Signal Received.
Common causes: Common causes include Faulty Anti-lock Brake System (ABS) Module, Anti-lock Brake System (ABS) Module harness is open or shorted, Anti-lock Brake System (ABS) Module 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 2,834

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1408 RAM Description

The Diagnostic Trouble Code (DTC) sets when the Body Control Module (BCM) receives an invalid signal from the Anti-lock Brake System (ABS) Module.

OBDII Code U1408 RAM - Implausible Brake Signal Received - AutoCodes.com — U1408 RAM Code - Implausible Brake Signal Received

What does this mean?

What are the Possible Causes of the DTC U1408 RAM?

Faulty Anti-lock Brake System (ABS) Module
Anti-lock Brake System (ABS) Module harness is open or shorted
Anti-lock Brake System (ABS) Module circuit poor electrical connection

How to Fix the DTC U1408 RAM?

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 U1408 RAM 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 U1408 RAM code?

Need more information on how to fix the U1408 RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1408 RAM code diagnosed by a professional: Find a repair shop in your area

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 RAM Code

1. What does the OBDII code U1408 RAM mean?

The U1408 code indicates that an implausible brake signal has been received by the vehicle's control module.

2. What are the common symptoms of U1408 RAM code?

Common symptoms of the U1408 code may include issues with the brake lights, ABS warning light illuminated on the dashboard, and potential brake system malfunctions.

3. What are the possible causes of the U1408 RAM code?

Possible causes of the U1408 code include faulty brake light switch, wiring issues in the brake light circuit, damaged ABS module, or a malfunctioning control module.

4. How do I diagnose the U1408 RAM code?

Diagnosing the U1408 code typically involves inspecting the brake light switch, checking the wiring for any damage or corrosion, and using a diagnostic scanner to retrieve specific error codes from the vehicle's control module.

5. Can I still drive my vehicle with the U1408 RAM code present?

It is not recommended to drive your vehicle with the U1408 code present, as it can indicate potential brake system issues that may compromise your safety on the road.

6. How do I repair the U1408 RAM code?

Repairing the U1408 code may involve replacing the faulty brake light switch, repairing damaged wiring in the brake light circuit, or addressing any issues with the ABS or control module.

7. Can the U1408 RAM code be reset without repairs?

While you can clear the U1408 code with a diagnostic scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Is the U1408 RAM code a common issue in certain vehicle models?

The U1408 code can be more common in specific vehicle models, especially those equipped with advanced brake systems and electronic control modules.

9. How much does it typically cost to repair the U1408 RAM code?

The cost of repairing the U1408 code can vary depending on the underlying issue, but it may range from a simple brake light switch replacement to more complex wiring repairs or module replacements.

10. Can I prevent the U1408 RAM code from appearing in the future?

Regular maintenance of your vehicle's brake system, including checking the brake light switch and wiring, can help prevent issues that may trigger the U1408 code.