P143B 2016 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect
Quick Answer
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Reductant Control 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 2016 GMC Sierra indicates Reductant Control System Information Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Reductant Control 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.
Code P143B 2016 GMC Sierra Description
What are the Possible Causes of the DTC P143B 2016 GMC Sierra?
- Faulty Reductant Control System
How to Fix the DTC P143B 2016 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P143B 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P143B 2016 GMC Sierra code?
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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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