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U140B Jeep Code - Implausible Left Rear Wheel Speed Signal Received

Quick Answer

The U140B code for Jeep vehicles indicates that an implausible left rear wheel speed signal has been received by the vehicle's electronic control module (ECM). Common causes include Faulty left rear wheel speed sensor, Damaged or corroded wiring/connectors related to the left rear wheel speed sensor, Issues with the ECM or ABS module. 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 Jeep indicates Implausible Left Rear Wheel Speed Signal Received.
Common causes
Common causes include Faulty left rear wheel speed sensor, Damaged or corroded wiring/connectors related to the left rear wheel speed sensor, Issues with the ECM or ABS module.
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 15, 2024
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Code U140B Jeep Description

The U140B code for Jeep vehicles indicates that an implausible left rear wheel speed signal has been received by the vehicle's electronic control module (ECM). This means that the ECM is detecting a discrepancy between the speed of the left rear wheel as measured by the wheel speed sensor and the expected speed based on the vehicle's operating conditions. This discrepancy can lead to various issues with the vehicle's stability control system, traction control system, and anti-lock braking system.

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

Common Causes of U140B Jeep

  1. Faulty left rear wheel speed sensor
  2. Damaged or corroded wiring/connectors related to the left rear wheel speed sensor
  3. Issues with the ECM or ABS module
  4. Wheel bearing or hub assembly issues affecting the left rear wheel speed sensor
  5. Incorrect tire size or pressure on the left rear wheel

Symptoms of U140B Jeep

  1. Illumination of the ABS warning light on the dashboard
  2. Traction control system engaging unexpectedly or inconsistently
  3. Uneven braking or pulling to one side during braking
  4. Decreased stability and handling of the vehicle

How to Fix U140B Jeep

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific fault codes and confirm the issue is related to the left rear wheel speed sensor.
  2. Inspect the left rear wheel speed sensor and its wiring for any visible damage, corrosion, or loose connections. Replace or repair as necessary.
  3. Test the left rear wheel speed sensor using a multimeter to ensure it is functioning properly. Replace if faulty.
  4. Check the wheel bearing and hub assembly on the left rear wheel for any issues that may be affecting the wheel speed sensor's readings. Replace if necessary.
  5. Clear the fault codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U140B Jeep

The typical repair costs for addressing the U140B code on a Jeep vehicle can vary depending on the specific cause of the issue. In general, replacing a faulty wheel speed sensor can cost between $100 and $200, while addressing wiring or connector issues may range from $50 to $150. If the problem is related to the ECM or ABS module, the repair costs can be higher, potentially exceeding $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, so the total repair bill can add up quickly. It is advisable to consult with a qualified mechanic or dealership to get an accurate estimate based on the specific circumstances of the vehicle.

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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 Jeep Code

1. What are the common symptoms of the U140B OBDII code in a Jeep?

- Common symptoms include ABS or traction control warning lights on the dashboard, uneven braking, and potential stability control issues.

2. What does the U140B code "Implausible Left Rear Wheel Speed Signal Received" mean in a Jeep?

- This code indicates that the vehicle's onboard computer has detected an implausible signal coming from the left rear wheel speed sensor.

3. What are the possible causes of the U140B code in a Jeep?

- Possible causes include a faulty left rear wheel speed sensor, damaged wiring or connectors, sensor alignment issues, or problems with the ABS module.

4. How can I diagnose the U140B code in my Jeep?

- Diagnosing the U140B code typically involves inspecting the left rear wheel speed sensor, checking for damaged wiring or connectors, and using a diagnostic scanner to read the code and clear it.

5. Can I still drive my Jeep with the U140B code present?

- It is not recommended to drive the vehicle with the U140B code active, as it can affect the proper functioning of the ABS, traction control, and stability control systems.

6. How can I repair the U140B code in my Jeep?

- Repairing the U140B code may involve replacing the left rear wheel speed sensor, repairing damaged wiring or connectors, realigning the sensor, or addressing any issues with the ABS module.

7. Is the U140B code a serious issue in a Jeep?

- The U140B code should be addressed promptly to ensure the proper functioning of the vehicle's safety systems, such as ABS and traction control.

8. Can weather conditions affect the U140B code in a Jeep?

- Extreme weather conditions, such as heavy rain or snow, can potentially cause issues with the wheel speed sensors and trigger the U140B code in a Jeep.

9. How much does it cost to repair the U140B code in a Jeep?

- The cost of repairing the U140B code can vary depending on the specific cause of the issue, but it may involve sensor replacement, wiring repairs, or module reprogramming.

10. Can I reset the U140B code in my Jeep without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the underlying issue causing the U140B code is not addressed. It is recommended to diagnose and repair the problem to prevent further issues.

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