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Engine-Codes – Chevrolet – P143B 2015 Chevrolet Silverado

P143B 2015 Chevrolet Silverado Code - Reductant Control System Information Signal Message Counter Incorrect

Quick Answer

The P143B code indicates a malfunction in the reductant control system of a 2015 Chevrolet Silverado, specifically relating to the information signal message counter. Common causes include Faulty Wiring or Connectors: Damaged or corroded wiring or connectors between the ECM and RCM can disrupt communication, Software Issues: Glitches or outdated software in the ECM or RCM may lead to incorrect message processing, Defective Reductant Control Module: A malfunctioning RCM can fail to send accurate information to the ECM. 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 Chevrolet Silverado indicates Reductant Control System Information Signal Message Counter Incorrect.
Common causes
Common causes include Faulty Wiring or Connectors: Damaged or corroded wiring or connectors between the ECM and RCM can disrupt communication, Software Issues: Glitches or outdated software in the ECM or RCM may lead to incorrect message processing, Defective Reductant Control Module: A malfunctioning RCM can fail to send accurate information to the ECM.
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 Oct 21, 2024
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Code P143B 2015 Chevrolet Silverado Description

The P143B code indicates a malfunction in the reductant control system of a 2015 Chevrolet Silverado, specifically relating to the information signal message counter. This code is part of the vehicle's onboard diagnostics (OBD-II) system, which monitors various components and systems to ensure they are functioning correctly. The reductant control system is responsible for managing the injection of diesel exhaust fluid (DEF) into the exhaust stream to reduce nitrogen oxide (NOx) emissions. When the system detects an inconsistency in the message counter, it suggests that the communication between the engine control module (ECM) and the reductant control module (RCM) is compromised.

OBDII Code P143B 2015 Chevrolet Silverado - Reductant Control System Information Signal Message Counter Incorrect
P143B 2015 Chevrolet Silverado Code - Reductant Control System Information Signal Message Counter Incorrect

Common Causes of P143B 2015 Chevrolet Silverado

  1. Faulty Wiring or Connectors: Damaged or corroded wiring or connectors between the ECM and RCM can disrupt communication.
  2. Software Issues: Glitches or outdated software in the ECM or RCM may lead to incorrect message processing.
  3. Defective Reductant Control Module: A malfunctioning RCM can fail to send accurate information to the ECM.
  4. Poor Quality Diesel Exhaust Fluid: Contaminated or low-quality DEF can affect the system's performance and signal accuracy.
  5. Sensor Failures: Malfunctioning sensors, such as the DEF quality sensor, can lead to incorrect readings and trigger the code.

Symptoms of P143B 2015 Chevrolet Silverado

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Reduced Engine Power: The vehicle may enter limp mode, restricting acceleration and overall power.
  3. Increased Emissions: The vehicle may produce higher levels of NOx emissions, potentially leading to failed emissions tests.
  4. Poor Fuel Economy: Drivers may notice a decrease in fuel efficiency due to improper engine management.
  5. Erratic Engine Performance: The vehicle may experience stalling, rough idling, or hesitation during acceleration.

How to Fix P143B 2015 Chevrolet Silverado

  1. Diagnostic Scan: Begin with a thorough diagnostic scan to confirm the P143B code and check for any related codes.
  2. Visual Inspection: Inspect the wiring and connectors associated with the reductant control system for signs of damage or corrosion.
  3. Software Update: If software issues are suspected, update the ECM and RCM software to the latest version available from the manufacturer.
  4. Replace Faulty Components: If the RCM or any sensors are found to be defective, replace them with OEM or high-quality aftermarket parts.
  5. Test and Clear Codes: After repairs, clear the diagnostic trouble codes and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P143B 2015 Chevrolet Silverado

The cost to repair the P143B code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $200 and $800 for parts and labor. This estimate includes potential costs for wiring repairs, sensor replacements, or module updates. Labor rates typically range from $80 to $150 per hour, depending on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer more competitive pricing. It is advisable to check local rates for a more precise estimate tailored to your specific situation.

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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 Chevrolet Silverado Code

1. What does OBDII code P143B mean on a 2015 Chevrolet Silverado?

P143B indicates an issue with the reductant control system, specifically that the information signal message counter is incorrect or invalid.

2. What are the common symptoms of code P143B in a 2015 Chevrolet Silverado?

Symptoms may include the check engine light turning on, poor DEF (Diesel Exhaust Fluid) system performance, or potential issues with emissions compliance.

3. What causes the P143B code to appear in a 2015 Chevrolet Silverado?

Common causes include faulty reductant control module software, wiring or connector issues in the reductant system, or a malfunctioning reductant control module.

4. Can a faulty Diesel Exhaust Fluid (DEF) quality sensor trigger the P143B code?

Yes, a failing DEF quality sensor can sometimes cause communication errors that lead to the P143B code.

5. How do I diagnose the P143B code on my 2015 Chevrolet Silverado?

Diagnosis involves using an OBDII scanner to verify the code, inspecting the wiring and connectors in the reductant control system, and testing the reductant control module for proper communication and operation.

6. Is it safe to drive with a P143B code on my 2015 Chevrolet Silverado?

While the vehicle may still be drivable, ignoring this code could lead to increased emissions or potential DEF system failures, so it’s best to address it promptly.

7. How can I fix the P143B code on my 2015 Chevrolet Silverado?

Repairs may include updating the reductant control module software, repairing damaged wiring or connectors, or replacing the reductant control module if faulty.

8. Will clearing the P143B code solve the problem permanently?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return.

9. Can a low DEF level cause the P143B code?

While low DEF levels typically trigger other specific codes, maintaining proper DEF levels is essential to avoid related system issues.

10. Should I take my Silverado to a professional for the P143B code?

If you’re unable to diagnose or repair the issue yourself, consulting a professional mechanic with experience in diesel systems is recommended.

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