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Engine-Codes – Generic – U140B

U140B Code - Implausible Left Rear Wheel Speed Signal Received

Quick Answer

The U140B code indicates that an implausible signal has been received from the left rear wheel speed sensor. Common causes include Faulty left rear wheel speed sensor, Damaged wiring or connectors related to the sensor, Corrosion or debris affecting the sensor's signal. 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 indicates Implausible Left Rear Wheel Speed Signal Received.
Common causes
Common causes include Faulty left rear wheel speed sensor, Damaged wiring or connectors related to the sensor, Corrosion or debris affecting the sensor's signal.
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 06, 2024
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Code U140B Description

The U140B code indicates that an implausible signal has been received from the left rear wheel speed sensor. This can affect the vehicle's stability control system, anti-lock braking system (ABS), and traction control system. The vehicle's computer uses data from the wheel speed sensors to determine the speed of each wheel and make adjustments as needed to ensure optimal traction and stability. An implausible signal can lead to incorrect readings and potentially affect the performance of these systems, leading to reduced safety and control while driving. If not addressed, this issue can result in decreased handling capabilities, compromised braking performance, and potential safety hazards on the road. The underlying cause of this code could be related to a faulty wheel speed sensor, damaged wiring, or a problem with the ABS module.

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

Common Causes of U140B

  1. Faulty left rear wheel speed sensor
  2. Damaged wiring or connectors related to the sensor
  3. Corrosion or debris affecting the sensor's signal
  4. Issues with the ABS module or control unit

Symptoms of U140B

  1. ABS warning light illuminated on the dashboard
  2. Traction control system not functioning properly
  3. Vehicle stability control system interventions
  4. Loss of traction or stability while driving

How to Fix U140B

  1. Begin by diagnosing the specific cause of the code, which may involve using a scan tool to retrieve additional data from the vehicle's computer.
  2. Inspect the left rear wheel speed sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Test the sensor's signal using a multimeter to ensure it is functioning correctly.
  4. Check the ABS module for any faults or malfunctions and address any issues found.
  5. Clear the code from the vehicle's computer and test drive the vehicle to ensure the problem has been resolved.

Cost to Fix U140B

The typical repair costs for resolving an implausible left rear wheel speed signal code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates can vary, so it's recommended to obtain a personalized estimate from a trusted auto repair shop.

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Code U140B Information for Specific Makes

  • U140B Chrysler — Implausible Left Rear Wheel Speed Signal Received
  • U140B Dodge — Implausible Left Rear Wheel Speed Signal Received
  • U140B Jeep — Implausible Left Rear Wheel Speed Signal Received
  • U140B RAM — Implausible Left Rear 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 U140B Code

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

The common symptoms of code U140B include ABS or traction control warning lights, erratic or incorrect speedometer readings, and potential issues with the vehicle's stability control system.

2. What could cause the OBDII code U140B to trigger?

The U140B code is triggered when the vehicle's onboard computer receives an implausible signal from the left rear wheel speed sensor. This can be caused by a faulty wheel speed sensor, damaged wiring, or a problem with the ABS module.

3. How can I diagnose the cause of code U140B?

Diagnosing code U140B typically involves using a scan tool to check for the specific wheel speed sensor that is sending an implausible signal. It may also involve inspecting the wiring and connections related to the left rear wheel speed sensor.

4. Can I continue to drive my vehicle with code U140B present?

It is not recommended to drive the vehicle with code U140B present, as it can affect the proper functioning of the ABS, traction control, and stability control systems. Continued driving may pose a safety risk.

5. How can I repair OBDII code U140B?

Repairing code U140B often involves replacing the faulty left rear wheel speed sensor, repairing any damaged wiring or connections, and clearing the code with a scan tool. In some cases, recalibrating the ABS module may also be necessary.

6. Are there any DIY tips for fixing code U140B?

While diagnosing and repairing code U140B may require advanced tools and expertise, checking the wheel speed sensor connections for corrosion or damage and ensuring they are properly secured can sometimes resolve the issue.

7. Can weather conditions affect the triggering of code U140B?

Extreme weather conditions, such as heavy rain or snow, can potentially affect the performance of wheel speed sensors and trigger code U140B. Ensuring the sensors are clean and free from debris can help prevent issues.

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

The time required to repair code U140B can vary depending on the exact cause of the issue and the availability of replacement parts. In general, a straightforward repair may take a few hours to complete.

9. Is it necessary to reset the ABS system after repairing code U140B?

After repairing code U140B, it is advisable to reset the ABS system using a scan tool to clear any stored fault codes and ensure proper functioning of the system. This can help prevent further issues.

10. Can code U140B affect the overall drivability of the vehicle?

Code U140B primarily affects the operation of the ABS, traction control, and stability control systems. While it may not directly impact the engine or transmission, unresolved issues with the ABS system can impact overall drivability and safety.

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