AutoCodes – Buick – P143B Buick

P143B Buick 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 Buick 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.

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Code Popularity 397

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 P143B Buick 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 Information Signal Message Counter is Incorrect.

OBDII Code P143B Buick - Reductant Control System Information Signal Message Counter Incorrect - AutoCodes.com — P143B Buick Code - Reductant Control System Information Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P143B Buick?

Faulty Reductant Control System

How to Fix the DTC P143B Buick?

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 Buick 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.

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Need Help with the Code?

Get the P143B Buick code diagnosed by a professional: Find a repair shop in your area

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 Buick Code

1. What does the OBDII code P143B mean on a Buick?

The code P143B indicates an issue with the Reductant Control System, specifically that the information signal message counter is incorrect, which typically relates to communication errors between the ECM and the reductant control module.

2. What are the common symptoms of code P143B on a Buick?

Symptoms may include the check engine light turning on, possible loss of power, reduced fuel efficiency, or issues with the vehicleâ€™s emission control system.

3. What causes the P143B code to appear on a Buick?

Common causes include faulty wiring or connections in the reductant control system, a malfunctioning reductant control module, or corrupted software in the ECM.

4. Can I drive my Buick with the P143B code active?

While the vehicle may still be drivable, it is not recommended as the issue can affect emissions performance and may lead to further damage if not addressed promptly.

5. How is the P143B code diagnosed on a Buick?

A mechanic will typically use a scan tool to retrieve the code, inspect the wiring and connections in the reductant system, and test the functionality of the reductant control module.

6. What repairs can fix the P143B code on a Buick?

Repairs may include fixing or replacing damaged wiring, updating the ECM software, or replacing the reductant control module if it is found to be defective.

7. Does the P143B code affect emissions testing for my Buick?

Yes, a P143B code can cause your vehicle to fail an emissions test because it indicates a problem with the reductant system, which is part of the emissions control system.

8. How much does it cost to fix the P143B code on a Buick?

The repair cost can vary depending on the specific issue but may range from $150 for wiring repairs to $1,000 or more if the reductant control module needs to be replaced.

9. Can a software update resolve the P143B code on a Buick?

In some cases, a software update to the ECM or reductant control module may resolve the code if the issue is due to programming errors.

10. How can I prevent the P143B code from reoccurring on my Buick?

Regular maintenance, keeping the reductant system components clean, and addressing wiring or connection issues promptly can help prevent the code from returning.