AutoCodes – Generic – P143B

P143B 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 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 1,838

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

What does this mean?

What are the Possible Causes of the DTC P143B?

Faulty Reductant Control System

How to Fix the DTC P143B?

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 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 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P143B Buick — Reductant Control System Information Signal Message Counter Incorrect
P143B Cadillac — Reductant Control System Information Signal Message Counter Incorrect
P143B Chevrolet — Reductant Control System Information Signal Message Counter Incorrect
P143B GMC — Reductant Control System Information Signal Message Counter Incorrect

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 Code

1. What are the common symptoms of OBDII code P143B?

The common symptoms of OBDII code P143B include the check engine light illuminating on the dashboard and potential issues with the vehicle's emission control system.

2. What is the primary cause of OBDII code P143B?

The primary cause of OBDII code P143B is typically a malfunction or incorrect signal message counter in the reductant control system, which is responsible for controlling emissions.

3. How serious is OBDII code P143B?

OBDII code P143B is considered a moderate issue that should be addressed promptly to prevent potential damage to the vehicle's emission control system and ensure optimal engine performance.

4. Can I continue driving with OBDII code P143B present?

It is generally not recommended to continue driving with OBDII code P143B present, as it may lead to increased emissions and potential failure to pass an emissions test in regions where testing is mandatory.

5. How can I diagnose OBDII code P143B?

Diagnosing OBDII code P143B typically involves using an OBDII scanner to retrieve the specific fault code, followed by inspecting the reductant control system components for any signs of damage or malfunction.

6. What are some repair tips for fixing OBDII code P143B?

Repair tips for fixing OBDII code P143B may include checking the wiring and connectors in the reductant control system, resetting the fault code after conducting repairs, and ensuring proper reductant fluid levels.

7. Can a DIY enthusiast fix OBDII code P143B at home?

While some aspects of diagnosing and repairing OBDII code P143B can be done by a knowledgeable DIY enthusiast, it is recommended to seek professional help for accurate diagnosis and proper repairs to avoid further issues.

8. How much does it cost to repair OBDII code P143B?

The cost to repair OBDII code P143B can vary depending on the extent of the issue, the specific components that need replacement, and the labor rates of the repair shop. It is advisable to obtain multiple quotes for comparison.

9. Are there any preventative measures to avoid OBDII code P143B?

Regular maintenance of the vehicle's emission control system, such as checking reductant fluid levels and inspecting related components, can help prevent OBDII code P143B from occurring.

10. Can OBDII code P143B cause damage to the engine?

While OBDII code P143B itself may not directly cause damage to the engine, ignoring the issue and allowing increased emissions to persist can lead to long-term damage to the engine and other emission control components.