AutoCodes – Generic – U1409

U1409 Code - Implausible Left Front Wheel Speed Signal Received

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) detects an implausible Left Front Wheel Speed signal over the Controller Area Network (CAN) bus from the Anti-Lock Brake (ABS) Module. Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed Sensor 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: U1409 indicates Implausible Left Front Wheel Speed Signal Received.
Common causes: Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed Sensor 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 24,236

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U1409 Description

OBDII Code U1409 - Implausible Left Front Wheel Speed Signal Received - AutoCodes.com — U1409 Code - Implausible Left Front Wheel Speed Signal Received

What does this mean?

What are the Possible Causes of the DTC U1409?

Faulty Left Front Wheel Speed Sensor
Left Front Wheel Speed Sensor harness is open or shorted
Left Front Wheel Speed Sensor circuit poor electrical connection
Faulty Anti-Lock Brake System (ABS) Module

How to Fix the DTC U1409?

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 U1409 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 U1409 code?

Need more information on how to fix the U1409 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1409 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1409 Chrysler — Implausible Left Front Wheel Speed Signal Received
U1409 Dodge — Implausible Left Front Wheel Speed Signal Received
U1409 Jeep — Implausible Left Front Wheel Speed Signal Received
U1409 RAM — Implausible Left Front Wheel Speed Signal Received

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 U1409 Code

1. What are the common symptoms of OBDII code U1409?

The common symptoms of U1409 include ABS or traction control warning lights illuminated on the dashboard, erratic speedometer readings, and potential loss of stability control.

2. What can cause the OBDII code U1409 to trigger?

The U1409 code is triggered when the vehicle's control module detects an implausible signal from the left front wheel speed sensor, often due to a faulty sensor, damaged wiring, or a poor connection.

3. How can I diagnose the cause of the U1409 code?

Diagnosing the U1409 code typically involves inspecting the left front wheel speed sensor and its wiring for any signs of damage, checking the sensor's resistance, and using a scan tool to monitor sensor readings while driving.

4. Can I drive my vehicle with the U1409 code present?

It is not recommended to drive your vehicle with the U1409 code present, as it can affect the proper functioning of the ABS, traction control, and stability control systems, potentially compromising your safety.

5. How can I repair the U1409 code?

Repairing the U1409 code usually involves replacing the left front wheel speed sensor if it is faulty, repairing any damaged wiring, and ensuring all connections are secure and free of corrosion.

6. Will the U1409 code reset on its own after repairs are made?

After the necessary repairs are made to address the U1409 code, you may need to use an OBDII scan tool to clear the code and reset the vehicle's system for the warning lights to turn off.

7. Is the U1409 code a common issue in certain vehicle makes or models?

The U1409 code can be more common in certain vehicle makes or models that are equipped with ABS, traction control, and stability control systems utilizing wheel speed sensors.

8. Can extreme weather conditions cause the U1409 code to trigger?

Extreme weather conditions, such as heavy rain or snow, can potentially lead to water or debris affecting the wheel speed sensor, wiring, or connections, triggering the U1409 code.

9. Are there any preventive measures to avoid the U1409 code in the future?

Regularly inspecting and maintaining the wheel speed sensors, wiring, and connections, as well as ensuring they are free of debris or damage, can help prevent the occurrence of the U1409 code.

10. How long does it typically take to repair the U1409 code?

The time needed to repair the U1409 code can vary depending on the extent of the issue and the availability of parts, but it generally takes a few hours to a full day for diagnosis and repair.