AutoCodes – Jeep – U1408 Jeep

U1408 Jeep 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 Jeep 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 14,764

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 Jeep 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 Jeep - Implausible Brake Signal Received - AutoCodes.com — U1408 Jeep Code - Implausible Brake Signal Received

What does this mean?

What are the Possible Causes of the DTC U1408 Jeep?

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 Jeep?

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 Jeep 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.

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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 U1408 Jeep Code

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

The common symptoms include the brake lights staying on continuously, the brake lights not functioning at all, ABS warning lights illuminated on the dashboard, and potential issues with the vehicle's traction control system.

2. What are the possible causes of OBDII code U1408 in a Jeep?

Possible causes of code U1408 include faulty brake light switch, damaged wiring or connectors in the brake light circuit, issues with the ABS module, or a malfunctioning Body Control Module (BCM).

3. How can I diagnose the OBDII code U1408 in my Jeep?

Diagnosing code U1408 typically involves checking the brake light switch operation, inspecting the wiring and connectors in the brake light circuit, scanning the ABS module for any related fault codes, and testing the BCM for proper functionality.

4. Can I still drive my Jeep with the U1408 code?

It is not recommended to drive your Jeep with an active U1408 code, as it can affect the proper functioning of the brake lights and ABS system, potentially compromising your safety on the road.

5. How can I repair OBDII code U1408 in my Jeep?

Repairing code U1408 usually involves replacing a faulty brake light switch, repairing damaged wiring or connectors, addressing any issues with the ABS module, or reprogramming the BCM if necessary.

6. Is it possible to reset the U1408 code in my Jeep without fixing the underlying issue?

While you can clear the code temporarily, it will likely return if the root cause of the problem is not addressed. It is essential to diagnose and repair the issue to prevent the code from reappearing.

7. Are there any DIY tips for fixing OBDII code U1408 in a Jeep?

DIY tips for fixing code U1408 include checking and adjusting the brake light switch, inspecting the brake light wiring for damage, and ensuring all connectors are properly connected.

8. How much does it cost to fix OBDII code U1408 in a Jeep?

The cost of fixing code U1408 can vary depending on the specific cause of the issue. Repairs may range from a simple brake light switch replacement to more complex ABS module or BCM repairs, potentially costing anywhere from $50 to $500 or more.

9. Can a mechanic easily diagnose and repair OBDII code U1408 in a Jeep?

A qualified mechanic with experience in diagnosing automotive electrical issues should be able to efficiently diagnose and repair code U1408 in a Jeep, ensuring that the underlying cause is properly addressed.

10. Will fixing OBDII code U1408 improve the overall performance of my Jeep?

Fixing code U1408 is essential not only for safety reasons but also for the proper functioning of critical systems like the brakes and ABS. Resolving this issue will help maintain the overall performance and reliability of your Jeep.