P143B 2014 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect
Quick Answer
The P143B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the reductant control system's information signal message counter is incorrect. Common causes include Faulty reductant control module, Malfunctioning reductant injector, Wiring or connection issues in the 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 2014 GMC Sierra indicates Reductant Control System Information Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty reductant control module, Malfunctioning reductant injector, Wiring or connection issues in the 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.
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Code P143B 2014 GMC Sierra Description
The P143B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the reductant control system's information signal message counter is incorrect. This system is a crucial component of the vehicle's emissions control system, specifically designed to reduce harmful pollutants in the exhaust gases. The reductant control system utilizes a reductant, such as diesel exhaust fluid (DEF), to convert nitrogen oxides (NOx) into harmless nitrogen and water vapor through a process called selective catalytic reduction (SCR).
Common Causes of P143B 2014 GMC Sierra
- Faulty reductant control module
- Malfunctioning reductant injector
- Wiring or connection issues in the reductant control system
- Software or programming errors in the engine control module (ECM)
- Contaminated or incorrect reductant fluid
Symptoms of P143B 2014 GMC Sierra
- Check engine light illuminated
- Reduced fuel efficiency
- Increased emissions output
- Engine hesitation or rough idling
- Reduced engine power
How to Fix P143B 2014 GMC Sierra
- Diagnose the specific cause of the P143B code using a diagnostic scan tool to pinpoint the issue within the reductant control system.
- Inspect the reductant control module, injector, wiring, and connections for any signs of damage, corrosion, or loose connections.
- Test the reductant fluid quality and ensure it meets the manufacturer's specifications.
- Clear the trouble code from the ECM's memory and reset the system to see if the code returns after repairs.
- If necessary, replace faulty components, repair wiring or connections, and reprogram the ECM to address the incorrect message counter.
Cost to Fix P143B 2014 GMC Sierra
The typical repair costs for addressing a P143B code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. Parts such as a reductant control module or injector can range from $200 to $500, while labor costs can add another $100 to $300 to the total repair bill. Overall, the total cost for resolving this issue may range from $300 to $800, including parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check local rates for a more accurate estimate.
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Frequently Asked Questions about P143B 2014 GMC Sierra Code
1. What does the OBDII code P143B mean on a 2014 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?
Symptoms may include a check engine light, reduced engine power, warning messages about the DEF (Diesel Exhaust Fluid) system, or the vehicle entering limp mode.
3. What causes the P143B code to appear?
The code is often caused by communication errors between the Engine Control Module (ECM) and the Reductant Control Module, a faulty module, wiring issues, or software glitches.
4. Can a failing DEF system cause the P143B code?
Yes, a malfunction in the DEF system, such as a faulty DEF pump or sensor, can lead to communication issues triggering the P143B code.
5. How do you diagnose the P143B code?
Diagnosis involves scanning for additional codes, inspecting the wiring and connectors between the ECM and Reductant Control Module, and testing the module for proper operation.
6. Is it safe to drive with the P143B code?
Driving with this code is not recommended, as it can lead to reduced engine performance or the vehicle entering limp mode, potentially stranding you.
7. How can I fix the P143B code on a 2014 GMC Sierra?
Fixes may include repairing or replacing damaged wiring, reprogramming or replacing the Reductant Control Module, or performing a software update in the ECM.
8. Can a software update resolve the P143B code?
Yes, in some cases, a software update for the ECM or Reductant Control Module can resolve communication errors and clear the code.
9. What tools are needed to troubleshoot the P143B code?
You’ll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for checking wiring, and possibly a scan tool for module reprogramming.
10. How much does it cost to repair the P143B code?
Repair costs vary depending on the issue, ranging from $100 for a simple wiring fix to $1,000 or more for module replacement and programming.
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