AutoCodes – RAM – U140B RAM

U140B RAM Code - Implausible Left Rear Wheel Speed Signal Received

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) detects an implausible Left Rear Wheel Speed signal over the Controller Area Network (CAN) bus from the Anti-Lock Brake (ABS) Module. Common causes include Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted, Left Rear 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: U140B RAM indicates Implausible Left Rear Wheel Speed Signal Received.
Common causes: Common causes include Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted, Left Rear 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 2,854

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 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U140B RAM Description

OBDII Code U140B RAM - Implausible Left Rear Wheel Speed Signal Received - AutoCodes.com — U140B RAM Code - Implausible Left Rear Wheel Speed Signal Received

What does this mean?

What are the Possible Causes of the DTC U140B RAM?

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

How to Fix the DTC U140B 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 U140B 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 U140B RAM Code

1. What are the common symptoms of OBDII code U140B RAM?

The common symptoms of U140B RAM include ABS warning light illuminated on the dashboard, traction control system malfunction, and potential loss of stability control.

2. What is the cause of OBDII code U140B RAM?

This code is triggered when the vehicle's onboard computer detects an implausible signal coming from the left rear wheel speed sensor, which may be caused by a faulty sensor, damaged wiring, or a problem with the ABS module.

3. How can I diagnose the issue related to code U140B RAM?

Diagnosing the issue involves checking the left rear wheel speed sensor for proper operation, inspecting the wiring for any damage or corrosion, and using a professional OBDII scanner to read the error codes stored in the ABS module.

4. Can I continue driving my vehicle with code U140B RAM?

It is not recommended to continue driving your vehicle with U140B RAM as it can affect the proper functioning of the ABS and traction control systems, potentially compromising your safety on the road.

5. How can I repair OBDII code U140B RAM?

Repairing U140B RAM typically involves replacing the left rear wheel speed sensor if it is found to be faulty, repairing any damaged wiring, or resetting the ABS module after fixing the underlying issue.

6. Can a DIY enthusiast fix OBDII code U140B RAM?

While some DIY enthusiasts may be able to diagnose and fix simple issues related to U140B RAM, it is recommended to consult a professional mechanic with experience in ABS and traction control systems for proper diagnosis and repair.

7. Is it expensive to repair OBDII code U140B RAM?

The cost of repairing U140B RAM can vary depending on the underlying cause of the issue, the parts needed for repair, and the labor charges. It is advisable to obtain quotes from different repair shops for an accurate estimate.

8. How long does it take to repair OBDII code U140B RAM?

The repair time for U140B RAM can vary depending on the complexity of the issue and the availability of parts. Simple fixes like sensor replacement may take a few hours, while more intricate problems could require more time.

9. Can weather conditions affect the occurrence of OBDII code U140B RAM?

Extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially affect the operation of wheel speed sensors and trigger code U140B RAM. Ensuring proper maintenance and protection of these sensors can help prevent such issues.

10. How often does OBDII code U140B RAM occur in vehicles?

U140B RAM is a relatively uncommon OBDII code that may occur sporadically in some vehicles due to sensor or wiring issues. Regular maintenance and inspection of ABS components can help prevent its occurrence.