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

Quick Answer

The P143B diagnostic trouble code for GMC vehicles indicates that there is an issue with the Reductant Control System Information Signal Message Counter being incorrect. Common causes include Faulty Reductant Control Module: A malfunctioning or damaged Reductant Control Module can cause issues with the signal message counter, Wiring Issues: Corrosion, damage, or loose connections in the wiring harnesses related to the Reductant Control System can disrupt the signal communication, Software Glitch: Occasionally, a software glitch or programming error within the vehicle's engine control module (ECM) can trigger this code. 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 GMC indicates Reductant Control System Information Signal Message Counter Incorrect.
Common causes
Common causes include Faulty Reductant Control Module: A malfunctioning or damaged Reductant Control Module can cause issues with the signal message counter, Wiring Issues: Corrosion, damage, or loose connections in the wiring harnesses related to the Reductant Control System can disrupt the signal communication, Software Glitch: Occasionally, a software glitch or programming error within the vehicle's engine control module (ECM) can trigger this code.
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 GMC Description

The P143B diagnostic trouble code for GMC vehicles indicates that there is an issue with the Reductant Control System Information Signal Message Counter being incorrect. This system is a part of the vehicle's emissions control system, specifically related to the selective catalytic reduction (SCR) system. The SCR system helps reduce harmful emissions by injecting a liquid reductant agent into the exhaust stream, which reacts with nitrogen oxides to convert them into harmless nitrogen and water vapor.

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

Common Causes of P143B GMC

  1. Faulty Reductant Control Module: A malfunctioning or damaged Reductant Control Module can cause issues with the signal message counter.
  2. Wiring Issues: Corrosion, damage, or loose connections in the wiring harnesses related to the Reductant Control System can disrupt the signal communication.
  3. Software Glitch: Occasionally, a software glitch or programming error within the vehicle's engine control module (ECM) can trigger this code.
  4. Exhaust System Leak: A leak in the exhaust system, particularly around the SCR system components, can impact the proper function of the Reductant Control System.
  5. Contaminated Reductant Agent: If the reductant agent is contaminated or of poor quality, it can also cause issues with the system's operation.

Symptoms of P143B GMC

  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: Issues with the Reductant Control System can lead to decreased fuel efficiency due to improper dosing of the reductant agent.
  3. Failed Emissions Test: If the system is not functioning correctly, the vehicle may fail emissions tests due to increased emissions output.
  4. Poor Performance: In some cases, drivers may notice a reduction in overall performance, such as decreased acceleration or responsiveness.

How to Fix P143B GMC

  1. Diagnostic Scan: The first step in addressing this code is to perform a diagnostic scan using a professional scan tool to pinpoint the exact cause of the issue.
  2. Inspect Wiring: Check the wiring harnesses for any signs of damage, corrosion, or loose connections, and repair or replace as needed.
  3. Test Reductant Control Module: Test the Reductant Control Module to ensure it is functioning properly, and replace if necessary.
  4. Check for Exhaust Leaks: Inspect the exhaust system for any leaks around the SCR components and repair or replace as needed.
  5. Reflash ECM: In some cases, reprogramming or reflashing the engine control module (ECM) with updated software may resolve the issue.

Cost to Fix P143B GMC

The cost of repairing a P143B code related to the Reductant Control System can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this kind of issue can range from $200 to $600, including parts and labor. However, it's essential to note that prices may differ based on the vehicle's make and model, the location of the repair shop, and the complexity of the repair process. It's recommended to consult with a professional mechanic or dealership for a more accurate cost estimate.

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Information for Specific GMC 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 GMC Code

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

- Common symptoms include the Check Engine Light illuminating, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What does the OBDII code P143B GMC indicate?

- The code P143B indicates that the Reductant Control System Information Signal Message Counter is incorrect, signaling a problem with the vehicle's emissions control system.

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

- Possible causes include a faulty Reductant Control Module, issues with the wiring or connectors in the system, or a software glitch in the vehicle's control module.

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

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, inspecting the Reductant Control System components, and checking for any visible damage or loose connections.

5. Can I continue driving my GMC vehicle with OBDII code P143B present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to increased emissions, reduced fuel efficiency, and potential damage to the vehicle's catalytic converter.

6. How can I repair OBDII code P143B in my GMC vehicle?

- Repairing this code may involve replacing the Reductant Control Module, repairing any damaged wiring or connectors, or updating the vehicle's control module software to correct the signal message counter.

7. Are there any DIY tips for addressing OBDII code P143B in a GMC vehicle?

- While some basic diagnostics can be done at home, it is recommended to seek professional help when dealing with this code to ensure proper diagnosis and repair.

8. Will resetting the Check Engine Light resolve OBDII code P143B in my GMC vehicle?

- Simply resetting the Check Engine Light may temporarily clear the code, but it will not address the underlying issue causing the incorrect Reductant Control System Information Signal Message Counter.

9. How much does it typically cost to repair OBDII code P143B in a GMC vehicle?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can OBDII code P143B cause my GMC vehicle to fail an emissions test?

- Yes, if left unresolved, OBDII code P143B can cause the vehicle to fail an emissions test due to increased emissions and improper operation of the Reductant Control System.

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