P143A 2017 GMC Sierra Code - Reductant Control System Diagnostic Signal Message Counter Incorrect
Quick Answer
The P143A diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Reductant Control System Diagnostic Signal Message Counter being incorrect. Common causes include Faulty Reductant Control Module: A malfunctioning or damaged Reductant Control Module can cause issues with the system's signal message counter, Wiring Issues: Corroded, damaged, or loose wiring connections related to the Reductant Control System can disrupt the signal communication, Software or Calibration Errors: Incorrect software programming or calibration settings can lead to discrepancies in the signal 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
- P143A 2017 GMC Sierra indicates Reductant Control System Diagnostic 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 system's signal message counter, Wiring Issues: Corroded, damaged, or loose wiring connections related to the Reductant Control System can disrupt the signal communication, Software or Calibration Errors: Incorrect software programming or calibration settings can lead to discrepancies in the signal 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P143A 2017 GMC Sierra Description
The P143A diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Reductant Control System Diagnostic Signal Message Counter being incorrect. This system is 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 (NOx) to convert them into harmless nitrogen and water vapor.
Common Causes of P143A 2017 GMC Sierra
- Faulty Reductant Control Module: A malfunctioning or damaged Reductant Control Module can cause issues with the system's signal message counter.
- Wiring Issues: Corroded, damaged, or loose wiring connections related to the Reductant Control System can disrupt the signal communication.
- Software or Calibration Errors: Incorrect software programming or calibration settings can lead to discrepancies in the signal message counter readings.
- Sensor Malfunction: A faulty NOx sensor or other related sensors can cause inaccurate data to be sent to the Reductant Control System.
- Exhaust System Leaks: Leaks in the exhaust system can affect the proper operation of the SCR system, leading to incorrect signal message counter readings.
Symptoms of P143A 2017 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 malfunctioning Reductant Control System can lead to increased fuel consumption due to improper dosing of the reductant agent.
- Failed Emissions Test: If the system is not functioning correctly, it may cause the vehicle to fail emissions tests due to increased NOx emissions.
- Reduced Engine Performance: In some cases, the vehicle may experience reduced engine performance or responsiveness due to the incorrect operation of the SCR system.
How to Fix P143A 2017 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the specific trouble code and further investigate the Reductant Control System for any visible damage or issues.
- Check Wiring and Connections: Inspect the wiring harness and connections related to the Reductant Control System for any signs of damage, corrosion, or looseness.
- Test Sensors: Test the NOx sensor and other relevant sensors to ensure they are functioning correctly and providing accurate data to the system.
- Replace Reductant Control Module: If the module is found to be faulty, replace it with a new one and reprogram it as necessary.
- Clear Codes and Test Drive: After completing the repairs, clear the diagnostic trouble codes, reset the system, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P143A 2017 GMC Sierra
The typical repair costs for addressing a P143A code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for replacing a Reductant Control Module can range from $200 to $500, while the labor costs for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue may fall between $300 and $800. It's important to note that these estimates are rough averages and actual costs may vary based on factors such as location, labor rates, and the need for additional repairs or parts replacement. It's recommended to consult with a qualified mechanic or repair shop for a more accurate cost estimate.
Need more information about the P143A 2017 GMC Sierra code?
Need more information on how to fix the P143A 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P143A 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P143A 2017 GMC Sierra Code
1. What does the OBDII code P143A mean on a 2017 GMC Sierra?
P143A indicates an issue with the Reductant Control System, specifically that the diagnostic signal message counter is incorrect. This often relates to communication errors within the diesel exhaust fluid (DEF) system.
2. What are the symptoms of code P143A in a 2017 GMC Sierra?
Common symptoms include a check engine light, DEF system warnings, reduced engine performance, or issues with the truck entering "limp mode."
3. What causes the P143A code to appear in a 2017 GMC Sierra?
The code is typically caused by a fault in the reductant control module, wiring issues, software glitches, or a problem with communication between the engine control module (ECM) and the reductant module.
4. Can I drive my 2017 GMC Sierra with a P143A code?
Driving with this code may be possible initially, but ignoring it can lead to reduced engine performance, DEF system malfunctions, or the truck entering "limp mode," which limits speed and power.
5. How is the P143A code diagnosed in a 2017 GMC Sierra?
A technician will use a scan tool to confirm the code, inspect wiring and connections for damage, and check for communication errors between the ECM and reductant control module.
6. What repairs can fix the P143A code in a 2017 GMC Sierra?
Repairs may include updating module software, repairing or replacing damaged wiring, or replacing the reductant control module if it's found to be faulty.
7. Are there any recalls for the P143A code on the 2017 GMC Sierra?
As of now, there are no specific recalls for this code, but it's worth checking with a GMC dealer for any relevant software updates or service bulletins.
8. How much does it cost to fix the P143A code on a 2017 GMC Sierra?
Repair costs will vary but may range from $100 to $1,000 depending on whether the issue is a simple wiring fix or a replacement of the reductant control module.
9. Can clearing the P143A code temporarily solve the problem?
Clearing the code may reset the warning temporarily, but if the underlying issue isn’t addressed, the code will likely return.
10. How can I prevent the P143A code from occurring again in my 2017 GMC Sierra?
Regular DEF system maintenance, keeping software up to date, and ensuring wiring connections are secure can help prevent this code from reoccurring.
Discuss the causes and fixes for P143A 2017 GMC Sierra OBDII Code
Code P143A 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.