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Engine-Codes – Generic – U140A

U140A Code - Implausible Right Front Wheel Speed Signal Received

Quick Answer

The U140A diagnostic trouble code (DTC) indicates that an implausible right front wheel speed signal has been received by the vehicle's control module. Common causes include Faulty right front wheel speed sensor, Damaged or corroded wiring/connectors leading to the sensor, Wheel speed sensor out of alignment. 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
U140A indicates Implausible Right Front Wheel Speed Signal Received.
Common causes
Common causes include Faulty right front wheel speed sensor, Damaged or corroded wiring/connectors leading to the sensor, Wheel speed sensor out of alignment.
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 Aug 30, 2024
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Code U140A Description

The U140A diagnostic trouble code (DTC) indicates that an implausible right front wheel speed signal has been received by the vehicle's control module. This means that the signal being sent by the right front wheel speed sensor does not match the expected values, which can lead to incorrect readings and affect the vehicle's stability control system, anti-lock braking system (ABS), traction control, and other safety features. This issue can compromise the vehicle's ability to accurately monitor wheel speed and adjust braking and traction control accordingly, potentially resulting in unsafe driving conditions.

OBDII Code U140A - Implausible Right Front Wheel Speed Signal Received
U140A Code - Implausible Right Front Wheel Speed Signal Received

Common Causes of U140A

  1. Faulty right front wheel speed sensor
  2. Damaged or corroded wiring/connectors leading to the sensor
  3. Wheel speed sensor out of alignment
  4. Issues with the vehicle's ABS module or control unit
  5. Electronic control module (ECM) software malfunction

Symptoms of U140A

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction
  3. Inaccurate speedometer readings
  4. Loss of stability control during cornering
  5. Increased stopping distance when braking

How to Fix U140A

  1. Begin by diagnosing the specific cause of the issue by using a diagnostic scan tool to retrieve the trouble codes and inspecting the right front wheel speed sensor and related components.
  2. Check the wiring harness and connectors for damage or corrosion, repairing or replacing them as needed.
  3. Adjust the alignment of the wheel speed sensor to ensure it is properly positioned and functioning correctly.
  4. If the sensor is faulty, replace it with a new one and ensure it is calibrated and programmed correctly to communicate with the vehicle's control module.
  5. Clear the trouble codes and perform a test drive to verify that the issue has been resolved and that the ABS, traction control, and stability control systems are functioning properly.

Cost to Fix U140A

The cost of repairing an implausible right front wheel speed signal code (U140A) can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of parts such as a new wheel speed sensor can range from $50 to $150, while labor costs can range from $100 to $300. Overall, you can expect the total repair cost to be between $150 and $450. It's recommended to consult with a professional mechanic or auto repair shop to get a more accurate estimate based on your vehicle's make and model, as well as local labor rates.

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Code U140A Information for Specific Makes

  • U140A Chrysler — Implausible Right Front Wheel Speed Signal Received
  • U140A Dodge — Implausible Right Front Wheel Speed Signal Received
  • U140A Jeep — Implausible Right Front Wheel Speed Signal Received
  • U140A RAM — Implausible Right Front 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 U140A Code

1. What are the common symptoms of OBDII code U140A?

- Common symptoms of code U140A include ABS or traction control warning lights illuminated on the dashboard, erratic speedometer readings, and potential loss of traction control functionality.

2. What can cause the OBDII code U140A to trigger?

- The code U140A is typically triggered by a malfunction in the right front wheel speed sensor or its circuitry, leading to an implausible signal being received by the vehicle's control module.

3. How can I diagnose the issue related to code U140A?

- To diagnose the issue, you can use a professional OBDII scanner to read the fault codes and perform a visual inspection of the right front wheel speed sensor and its wiring for any visible damage or corrosion.

4. Can a faulty ABS sensor cause code U140A?

- Yes, a faulty ABS sensor, particularly the right front wheel speed sensor, can trigger code U140A due to providing incorrect or implausible speed signals to the vehicle's control module.

5. What are some repair tips for resolving OBDII code U140A?

- Repair tips for resolving code U140A include checking and cleaning the wheel speed sensor connections, inspecting the sensor for damage, replacing the sensor if necessary, and clearing the fault codes to see if the issue recurs.

6. Is it safe to continue driving with OBDII code U140A triggered?

- It is not recommended to continue driving with code U140A triggered, as it can affect the proper functioning of the ABS and traction control systems, potentially compromising vehicle safety and stability.

7. Can a DIY enthusiast fix OBDII code U140A at home?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to fix code U140A at home by following repair guides, but it is advisable to have the necessary knowledge and caution when working on ABS and sensor systems.

8. How much does it cost to repair OBDII code U140A at a mechanic?

- The cost of repairing code U140A at a mechanic can vary depending on the labor rates and parts required, but it may typically range from $100 to $300, excluding any additional diagnosis or parts replacement.

9. Will resetting the fault codes resolve OBDII code U140A permanently?

- Resetting the fault codes may temporarily remove the warning lights associated with code U140A, but if the underlying issue with the right front wheel speed sensor persists, the code is likely to reappear until the problem is properly addressed.

10. Is it necessary to recalibrate the ABS system after fixing code U140A?

- In most cases, recalibrating the ABS system is not necessary after fixing code U140A unless specifically advised by the manufacturer or if other related components have been replaced, in which case following the manufacturer's procedures is recommended.

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