U140B 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 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.
Code U140B Description
What are the Possible Causes of the DTC U140B?
- 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?
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 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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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
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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