AutoCodes – Chevrolet – P143A 2015 Chevrolet Silverado

P143A 2015 Chevrolet Silverado Code - Reductant Control System Diagnostic 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: P143A 2015 Chevrolet Silverado indicates Reductant Control System Diagnostic 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.

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Code Popularity 501

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P143A 2015 Chevrolet Silverado Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Reductant Control System Diagnostic Signal Message Counter is Incorrect.

OBDII Code P143A 2015 Chevrolet Silverado - Reductant Control System Diagnostic Signal Message Counter Incorrect - AutoCodes.com — P143A 2015 Chevrolet Silverado Code - Reductant Control System Diagnostic Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P143A 2015 Chevrolet Silverado?

Faulty Reductant Control System

How to Fix the DTC P143A 2015 Chevrolet Silverado?

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 P143A 2015 Chevrolet Silverado 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 P143A 2015 Chevrolet Silverado code?

Need more information on how to fix the P143A 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P143A 2015 Chevrolet Silverado Code

1. What does the OBDII code P143A mean on a 2015 Chevrolet Silverado?

P143A indicates an issue with the Reductant Control System, specifically a diagnostic signal message counter that is incorrect or inconsistent.

2. What are the symptoms of code P143A in a 2015 Chevrolet Silverado?

Common symptoms include a check engine light, possible DEF (Diesel Exhaust Fluid) system warnings, and reduced engine performance in severe cases.

3. What causes the P143A code to appear?

The code is often caused by a malfunction in the reductant control module, communication errors between the module and the ECM, or a software issue.

4. Can a bad reductant tank sensor cause the P143A code?

Yes, a faulty reductant tank sensor or wiring can disrupt communication and trigger this code.

5. How do I fix the P143A code on my 2015 Chevy Silverado?

Repairs may include reprogramming the reductant control module, inspecting and repairing wiring, or replacing the defective module or sensors.

6. Is the P143A code related to the DEF system?

Yes, the P143A code is directly related to the DEF system, which manages diesel emissions using reductant fluid.

7. Can I drive my Silverado with the P143A code?

You may be able to drive short distances, but ignoring the issue could lead to reduced engine power or further damage to the emission system.

8. How is the P143A code diagnosed?

A mechanic will use a scan tool to check for related codes, inspect the reductant control module, and test the wiring and sensors in the DEF system.

9. Does the P143A code require module reprogramming?

In some cases, updating or reprogramming the reductant control module software can resolve the issue.

10. What is the cost to fix the P143A code on a 2015 Silverado?

The repair cost can vary but typically ranges from $150 to $1,000, depending on whether reprogramming, wiring repair, or component replacement is needed.