AutoCodes – RAM – U1409 RAM

U1409 RAM 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 RAM 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 1,645

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 U1409 RAM Description

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

What does this mean?

What are the Possible Causes of the DTC U1409 RAM?

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 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 U1409 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.

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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 U1409 RAM Code

1. What are the common symptoms of OBDII code U1409 RAM - Implausible Left Front Wheel Speed Signal Received?

The common symptoms include ABS warning light illuminated on the dashboard, traction control system malfunctions, and potential loss of stability control.

2. What are the possible causes of OBDII code U1409 RAM?

Possible causes of this code include a faulty wheel speed sensor, damaged wiring or connectors in the wheel speed sensor circuit, or a malfunctioning ABS module.

3. How can I diagnose the issue related to code U1409 RAM?

Diagnosing the issue involves using a diagnostic scan tool to retrieve the code, checking the wiring and connectors for any damage, testing the left front wheel speed sensor for proper functionality, and inspecting the ABS module.

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

It is not recommended to drive the vehicle with this code present, as it can affect the operation of important safety systems like ABS and traction control. It is best to address the issue promptly.

5. How can I repair OBDII code U1409 RAM - Implausible Left Front Wheel Speed Signal Received?

To repair this code, you may need to replace the left front wheel speed sensor if it is found to be faulty, repair any damaged wiring or connectors in the circuit, or replace the ABS module if necessary.

6. Will resetting the trouble codes make the U1409 code disappear?

While resetting the trouble codes may temporarily clear the code, it is likely to reappear if the underlying issue causing the code is not addressed.

7. Are there any DIY fixes for OBDII code U1409 RAM?

Some DIY fixes include checking and cleaning the connectors and wiring related to the left front wheel speed sensor, as well as ensuring the sensor is securely mounted and functioning properly.

8. Is it necessary to take my vehicle to a mechanic for U1409 code diagnosis and repair?

While some DIY checks can be performed, it is recommended to take your vehicle to a qualified mechanic for a thorough diagnosis and proper repair of the U1409 code to ensure the issue is resolved correctly.

9. How urgent is it to address OBDII code U1409 RAM?

It is important to address this code promptly to ensure the proper functioning of safety systems like ABS and traction control. Ignoring the issue could lead to potential safety risks while driving.

10. Can extreme weather conditions affect the occurrence of code U1409 RAM?

Extreme weather conditions, such as heavy rain or snow, can potentially affect the operation of wheel speed sensors and lead to the occurrence of code U1409 RAM. Regular maintenance and inspection can help prevent such issues.