P143B 2018 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect
Quick Answer
The diagnostic trouble code P143B in a 2018 GMC Sierra 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 module responsible for controlling the reductant injection process, Sensor Malfunction: Issues with sensors such as the NOx sensor or temperature sensor can lead to inaccurate data being sent to the ECM, Wiring Problems: Damaged or corroded wiring connections can disrupt communication within the system. 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 2018 GMC Sierra indicates Reductant Control System Information Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Reductant Control Module: A malfunction in the module responsible for controlling the reductant injection process, Sensor Malfunction: Issues with sensors such as the NOx sensor or temperature sensor can lead to inaccurate data being sent to the ECM, Wiring Problems: Damaged or corroded wiring connections can disrupt communication within the system.
- 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.
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Code P143B 2018 GMC Sierra Description
The diagnostic trouble code P143B in a 2018 GMC Sierra indicates a problem with the Reductant Control System Information Signal Message Counter being incorrect. This system is a crucial 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, typically diesel exhaust fluid (DEF), into the exhaust stream. The reductant reacts with the harmful nitrogen oxides (NOx) in the exhaust gases, converting them into nitrogen and water vapor, which are less harmful to the environment.
Common Causes of P143B 2018 GMC Sierra
- Faulty Reductant Control Module: A malfunction in the module responsible for controlling the reductant injection process.
- Sensor Malfunction: Issues with sensors such as the NOx sensor or temperature sensor can lead to inaccurate data being sent to the ECM.
- Wiring Problems: Damaged or corroded wiring connections can disrupt communication within the system.
- Software Glitches: Software issues within the ECM or other control modules can cause incorrect messages to be sent.
Symptoms of P143B 2018 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Fuel Efficiency: A decrease in fuel efficiency may be noticed due to the improper functioning of the Reductant Control System.
- Poor Engine Performance: The vehicle may experience rough idling, hesitation, or lack of power during acceleration.
- Increased Emissions: The vehicle may fail emissions tests or emit higher levels of pollutants due to the improper functioning of the emissions control system.
How to Fix P143B 2018 GMC Sierra
- Diagnostic Scan: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the exact cause of the issue.
- Inspect Sensors and Wiring: Check the NOx sensor, temperature sensor, and wiring connections for any damage or corrosion.
- Test Reductant Control Module: Test the functionality of the reductant control module to ensure it is operating correctly.
- Clear Codes and Reset System: Once the issue is identified and resolved, clear the trouble codes and reset the system to ensure proper operation.
Cost to Fix P143B 2018 GMC Sierra
The typical repair costs for addressing the P143B code in a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost can range from $200 to $500 for parts and labor. However, it is important to note that the diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops to get a more accurate estimate for the repair. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often offer more competitive prices.
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Frequently Asked Questions about P143B 2018 GMC Sierra Code
1. What does the OBDII code P143B mean on a 2018 GMC Sierra?
P143B indicates an issue with the Reductant Control System, specifically that the Information Signal Message Counter is incorrect, pointing to a communication error between modules.
2. What are the common symptoms of a P143B code?
Symptoms may include the check engine light or a service DEF (Diesel Exhaust Fluid) system warning, reduced engine performance, or trouble passing emissions tests.
3. What causes a P143B code to appear?
The code can be caused by issues such as faulty wiring or connectors, software glitches in the engine control module (ECM) or reductant control module, or a malfunctioning reductant system sensor.
4. Can a bad DEF sensor trigger the P143B code?
Yes, a malfunctioning DEF sensor within the reductant system can cause communication failures, leading to the P143B code.
5. How is the P143B code diagnosed?
A mechanic will use a scan tool to check for related codes, inspect wiring and connections in the reductant system, and verify communication between the ECM and reductant control module.
6. How can I fix the P143B code on my 2018 GMC Sierra?
Repairs may include updating the ECM software, repairing or replacing damaged wiring or connectors, or replacing a faulty sensor or reductant control module.
7. Is it safe to drive with a P143B code?
While the vehicle may still be drivable, ignoring the code can lead to reduced engine performance and potential DEF system failure, so it’s best to address the issue promptly.
8. Will clearing the P143B code with a scan tool fix the problem?
Clearing the code may temporarily remove the warning, but the underlying issue needs to be resolved to prevent the code from returning.
9. Can a low DEF fluid level cause the P143B code?
No, a low DEF level typically triggers different codes or warnings. The P143B code is related to communication errors in the reductant control system.
10. Does the P143B code require a software update to fix?
In some cases, updating the ECM or reductant control module software can resolve communication issues and fix the P143B code.
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