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P143B 2015 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect

Quick Answer

The P143B diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the Reductant Control System Information Signal Message Counter being incorrect. Common causes include Faulty reductant control module, Malfunctioning reductant level sensor, 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 2015 GMC Sierra indicates Reductant Control System Information Signal Message Counter Incorrect.
Common causes
Common causes include Faulty reductant control module, Malfunctioning reductant level sensor, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2024
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Code P143B 2015 GMC Sierra Description

The P143B diagnostic trouble code (DTC) for a 2015 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 uses a reductant, typically diesel exhaust fluid (DEF), to reduce harmful emissions such as nitrogen oxides (NOx) into nitrogen and water vapor. The Reductant Control System Information Signal Message Counter is responsible for monitoring and managing the reductant levels and injection into the exhaust stream to ensure optimal emissions control.

OBDII Code P143B 2015 GMC Sierra - Reductant Control System Information Signal Message Counter Incorrect
P143B 2015 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect

Common Causes of P143B 2015 GMC Sierra

  1. Faulty reductant control module
  2. Malfunctioning reductant level sensor
  3. Wiring or connection issues in the reductant control system
  4. Software or calibration issues in the engine control module
  5. Contaminated or incorrect reductant fluid

Symptoms of P143B 2015 GMC Sierra

  1. Check engine light illuminated
  2. Reduced fuel efficiency
  3. Increased emissions output
  4. Reduced engine performance
  5. Vehicle may go into limp mode

How to Fix P143B 2015 GMC Sierra

  1. Diagnose the specific cause of the P143B code using a diagnostic scanner and relevant service manuals.
  2. Inspect the reductant control module, reductant level sensor, wiring, and connections for any faults or damage.
  3. Test the reductant system components to ensure they are functioning correctly.
  4. Replace any faulty components such as the reductant control module or sensor.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix P143B 2015 GMC Sierra

The cost of repairing a P143B code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. Typically, the cost of parts for this repair can range from $200 to $500, while labor costs can range from $100 to $300. Overall, the total repair cost for addressing the P143B code may fall between $300 and $800. It's important to note that labor rates and part prices can vary based on location, vehicle make and model, and the repair shop chosen. It's advisable to obtain quotes from multiple repair shops to ensure a competitive price for the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P143B 2015 GMC Sierra Code

1. What does the OBDII code P143B mean on a 2015 GMC Sierra?

The P143B code indicates an issue with the Reductant Control System, specifically that the Information Signal Message Counter is incorrect or out of sequence.

2. What are the symptoms of the P143B code in a 2015 GMC Sierra?

Common symptoms include the check engine light turning on, possible DEF (Diesel Exhaust Fluid) system warnings, reduced engine performance, or limited vehicle speed.

3. What causes the P143B code to appear on a 2015 GMC Sierra?

The code can be caused by faulty wiring or connectors in the reductant control system, a malfunctioning reductant control module, or corrupted communication data between modules.

4. How is the P143B code diagnosed in a 2015 GMC Sierra?

Technicians use an OBDII scanner to retrieve the code, inspect the wiring and connectors in the reductant system, and check for proper communication between the ECM and the reductant control module.

5. Can I drive my 2015 GMC Sierra with the P143B code?

Driving with this code may be possible, but it could lead to reduced performance or even DEF system failure, which may trigger a speed restriction if not addressed.

6. How do I fix the P143B code on a 2015 GMC Sierra?

Repairs may include inspecting and repairing damaged wiring or connectors, reprogramming or replacing the reductant control module, and ensuring all related modules are functioning properly.

7. Does the P143B code mean I need to replace the reductant control module?

Not necessarily. The issue could be due to wiring or communication problems rather than a faulty module. Proper diagnostics are required before replacing any components.

8. What tools are needed to diagnose the P143B code on a 2015 GMC Sierra?

An OBDII scanner with advanced diagnostics, a multimeter for checking electrical circuits, and possibly GM-specific diagnostic software to test module communication are needed.

9. How much does it cost to fix the P143B code on a 2015 GMC Sierra?

Repair costs vary depending on the issue, but wiring repairs may cost around $100-$300, while module replacement or reprogramming can exceed $500.

10. Can a software update resolve the P143B code on a 2015 GMC Sierra?

In some cases, a software update for the ECM or reductant control module can resolve communication issues and clear the code. Consult a dealership or authorized technician.

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