P143B 2016 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect
Quick Answer
The diagnostic trouble code P143B on a 2016 GMC Sierra indicates that the reductant control system's information signal message counter is incorrect. Common causes include Faulty DEF Sensor: A malfunctioning DEF sensor can send incorrect signals to the ECM, leading to the message counter error, Wiring Issues: Damaged or corroded wiring connections between the ECM and RCM can disrupt communication and cause the code to trigger, Software Glitch: Software errors within the ECM or RCM can result in incorrect message counter readings. 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 2016 GMC Sierra indicates Reductant Control System Information Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty DEF Sensor: A malfunctioning DEF sensor can send incorrect signals to the ECM, leading to the message counter error, Wiring Issues: Damaged or corroded wiring connections between the ECM and RCM can disrupt communication and cause the code to trigger, Software Glitch: Software errors within the ECM or RCM can result in incorrect message counter readings.
- 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 2016 GMC Sierra Description
The diagnostic trouble code P143B on a 2016 GMC Sierra indicates that the reductant control system's information signal message counter is incorrect. The reductant control system is responsible for managing the injection of diesel exhaust fluid (DEF) into the exhaust stream to reduce harmful emissions. The incorrect message counter suggests a communication error or discrepancy between the various components of the system, potentially leading to improper DEF injection and emission control.
Common Causes of P143B 2016 GMC Sierra
- Faulty DEF Sensor: A malfunctioning DEF sensor can send incorrect signals to the ECM, leading to the message counter error.
- Wiring Issues: Damaged or corroded wiring connections between the ECM and RCM can disrupt communication and cause the code to trigger.
- Software Glitch: Software errors within the ECM or RCM can result in incorrect message counter readings.
- Communication Errors: Issues with the communication network between the various components of the reductant control system can lead to the code being set.
Symptoms of P143B 2016 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 Performance: The vehicle may experience reduced performance, including decreased power output or acceleration.
- Poor Fuel Efficiency: Incorrect DEF injection can lead to poor fuel efficiency as the engine may not operate at optimal levels.
- Failed Emissions Test: If the issue is not resolved, the vehicle may fail emissions tests due to increased emissions output.
How to Fix P143B 2016 GMC Sierra
- Diagnostic Scan: Begin by performing a diagnostic scan using a professional OBD-II scanner to retrieve the specific trouble code and identify the issue.
- Check Wiring and Connections: Inspect the wiring harness and connections between the ECM, RCM, and DEF sensor for any damage or corrosion. Repair or replace as needed.
- Test DEF Sensor: Test the DEF sensor to ensure it is functioning correctly and sending accurate signals to the ECM.
- Update Software: If a software glitch is suspected, update the software in the ECM and RCM to the latest version to resolve any potential issues.
- Clear Codes and Test Drive: Clear the trouble code from the vehicle's memory using the OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P143B 2016 GMC Sierra
The cost of repairing the P143B code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the repair may range from $100 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher at dealerships or in metropolitan areas. It's advisable to contact local auto repair shops for a more accurate estimate based on your specific circumstances.
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Frequently Asked Questions about P143B 2016 GMC Sierra Code
1. What does the OBDII code P143B mean on a 2016 GMC Sierra?
The P143B code indicates an issue with the reductant control system, specifically that the information signal message counter is incorrect.
2. What are the common symptoms of the P143B code in a 2016 GMC Sierra?
Symptoms may include the check engine light turning on, reduced engine power, or warnings related to the diesel exhaust fluid (DEF) system.
3. What causes the P143B code to appear in a GMC Sierra?
Common causes include a malfunctioning reductant control module, wiring or connector issues, or corrupted communication signals between the modules.
4. Can a faulty reductant control module trigger the P143B code?
Yes, a faulty or failing reductant control module can cause this code by sending incorrect or inconsistent message signals.
5. How can I diagnose the P143B trouble code on my 2016 GMC Sierra?
Use an advanced OBDII scanner to check for related codes, inspect the wiring and connections to the reductant control module, and test the module’s communication signals.
6. Can a bad diesel exhaust fluid (DEF) quality sensor cause the P143B code?
While a DEF quality sensor issue is less likely to cause this specific code, it can lead to related DEF-related warnings, so it’s worth inspecting.
7. What should I check first when troubleshooting the P143B code?
Start by inspecting the wiring and connectors to the reductant control module for damage, corrosion, or loose connections.
8. How serious is the P143B code on a GMC Sierra?
It’s moderately serious because it can affect the DEF system, potentially leading to reduced engine power or failure to meet emissions standards if not resolved.
9. Can I drive my 2016 GMC Sierra with the P143B code?
You can usually drive the truck temporarily, but ignoring this code might lead to reduced engine performance and emissions system issues.
10. How is the P143B code fixed on a 2016 GMC Sierra?
Repairs may include replacing the reductant control module, repairing damaged wiring, updating the vehicle’s software, or clearing the code after addressing the issue.
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