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P143B Chevrolet Code - Reductant Control System Information Signal Message Counter Incorrect

Quick Answer

The P143B diagnostic trouble code (DTC) for Chevrolet vehicles indicates a problem with the Reductant Control System Information Signal Message Counter being incorrect. Common causes include Faulty Reductant Control Module: A malfunction in the reductant control module can lead to incorrect signal message counter readings, Sensor Malfunction: A faulty sensor within the reductant control system can cause inaccuracies in the counter readings, Electrical Issues: Wiring harness problems or electrical faults can disrupt the communication between sensors and the control 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
P143B Chevrolet indicates Reductant Control System Information Signal Message Counter Incorrect.
Common causes
Common causes include Faulty Reductant Control Module: A malfunction in the reductant control module can lead to incorrect signal message counter readings, Sensor Malfunction: A faulty sensor within the reductant control system can cause inaccuracies in the counter readings, Electrical Issues: Wiring harness problems or electrical faults can disrupt the communication between sensors and the control 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 10, 2024
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Code P143B Chevrolet Description

The P143B diagnostic trouble code (DTC) for Chevrolet vehicles indicates a problem with the Reductant Control System Information Signal Message Counter being incorrect. This system is a crucial component of the vehicle's emissions control system, specifically designed to reduce harmful nitrogen oxide (NOx) emissions. When this code is triggered, it means that the signal message counter within the reductant control system is not functioning as intended, potentially leading to increased emissions and reduced overall engine performance.

OBDII Code P143B Chevrolet - Reductant Control System Information Signal Message Counter Incorrect
P143B Chevrolet Code - Reductant Control System Information Signal Message Counter Incorrect

Common Causes of P143B Chevrolet

  1. Faulty Reductant Control Module: A malfunction in the reductant control module can lead to incorrect signal message counter readings.
  2. Sensor Malfunction: A faulty sensor within the reductant control system can cause inaccuracies in the counter readings.
  3. Electrical Issues: Wiring harness problems or electrical faults can disrupt the communication between sensors and the control module.
  4. Software Glitches: Software issues within the reductant control system can also trigger this code.

Symptoms of P143B Chevrolet

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunction in the reductant control system can lead to decreased fuel efficiency due to inefficient emissions control.
  3. Failed Emissions Test: If the Reductant Control System Information Signal Message Counter is incorrect, the vehicle may fail emissions tests due to increased NOx emissions.
  4. Rough Idle: In some cases, the vehicle may experience rough idling or hesitation during acceleration as a result of this issue.

How to Fix P143B Chevrolet

  1. Diagnose the Issue: Use a diagnostic scan tool to retrieve the specific trouble code and identify the root cause of the problem.
  2. Inspect Sensors and Wiring: Check the sensors and wiring harness for any visible damage or loose connections that may be causing the incorrect counter readings.
  3. Test Reductant Control Module: Test the functionality of the reductant control module to determine if it is functioning properly or needs to be replaced.
  4. Reset Error Codes: Clear the error codes from the vehicle's computer system after the issue has been resolved to reset the check engine light.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been successfully resolved and that the Reductant Control System Information Signal Message Counter is now functioning correctly.

Cost to Fix P143B Chevrolet

The cost of repairing a P143B Chevrolet code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $200. This estimate does not include diagnostic fees, which can range from $80 to $150 per hour at most auto repair shops. It's important to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model, as well as local labor rates.

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Information for Specific Chevrolet Models

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 P143B Chevrolet Code

1. What are the common symptoms of OBDII code P143B in a Chevrolet vehicle?

- Common symptoms include the Check Engine Light (CEL) illuminating, reduced engine performance, and potential failures to pass emissions tests.

2. What does the OBDII code P143B Chevrolet mean?

- The code signifies that the Reductant Control System Information Signal Message Counter is reporting an incorrect value.

3. What are the possible causes of OBDII code P143B in a Chevrolet?

- Potential causes include a faulty reductant control module, wiring issues, sensor malfunctions, or software glitches.

4. How can I diagnose OBDII code P143B in my Chevrolet?

- Diagnosis typically involves using an OBDII scanner to read the code, checking the reductant control system components, and inspecting wiring connections for any issues.

5. How serious is OBDII code P143B in a Chevrolet?

- While the code may not cause immediate harm to the vehicle, it can lead to increased emissions and reduced fuel efficiency if left unresolved.

6. Can I drive my Chevrolet with OBDII code P143B?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential long-term problems.

7. How do I reset OBDII code P143B in a Chevrolet?

- The code can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. What are some common repair tips for fixing OBDII code P143B in a Chevrolet?

- Repair tips may include checking and cleaning the reductant control system components, replacing faulty sensors, and ensuring proper wiring connections.

9. Can a DIY enthusiast fix OBDII code P143B in a Chevrolet?

- Depending on the root cause, some DIY enthusiasts with the necessary tools and skills may be able to address the issue themselves. Otherwise, professional help may be required.

10. How much does it cost to repair OBDII code P143B in a Chevrolet?

- The cost of repair can vary significantly depending on the specific cause of the code, parts needed, labor rates, and whether the repair is done at a dealership or an independent mechanic.

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