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Engine-Codes – RAM – U140B RAM

U140B RAM Code - Implausible Left Rear Wheel Speed Signal Received

Quick Answer

The U140B code indicates that the vehicle's onboard computer has detected an implausible left rear wheel speed signal. Common causes include Faulty left rear wheel speed sensor, Corrosion or damage to the sensor wiring or connectors, Issues with the wheel bearing or hub assembly. 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, Corrosion or damage to the sensor wiring or connectors, Issues with the wheel bearing or hub assembly.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code U140B RAM Description

The U140B code indicates that the vehicle's onboard computer has detected an implausible left rear wheel speed signal. This means that the signal being received from the left rear wheel speed sensor does not align with the expected values, leading to a discrepancy in the data being processed by the vehicle's traction control and anti-lock braking systems. This issue can significantly affect the vehicle's performance, especially in terms of stability and braking capabilities.

OBDII Code U140B RAM - Implausible Left Rear Wheel Speed Signal Received
U140B RAM Code - Implausible Left Rear Wheel Speed Signal Received

Common Causes of U140B RAM

  1. Faulty left rear wheel speed sensor
  2. Corrosion or damage to the sensor wiring or connectors
  3. Issues with the wheel bearing or hub assembly
  4. Electronic control module (ECM) malfunction
  5. Interference from other electrical components or signals

Symptoms of U140B RAM

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction
  3. Uneven braking or pulling to one side during braking
  4. Loss of stability or control on slippery roads
  5. Decreased fuel efficiency due to improper wheel speed data

How to Fix U140B RAM

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD port to retrieve the specific fault codes and confirm the U140B code related to the left rear wheel speed signal.
  2. Inspect the left rear wheel speed sensor, wiring, and connectors for any signs of damage, corrosion, or loose connections. Replace or repair as necessary.
  3. Check the wheel bearing and hub assembly for any play or damage that could affect the sensor's readings. Replace if needed.
  4. Clear the fault codes from the vehicle's computer using the diagnostic scanner and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the exact cause, such as ECM testing or signal interference checks.

Cost to Fix U140B RAM

The typical repair costs for addressing the U140B code related to the left rear wheel speed signal can range from $150 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new wheel speed sensor, wiring repairs or replacements, and any additional components that may need to be replaced. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.

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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.

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