AutoCodes – GMC – P143B 2017 GMC Sierra

P143B 2017 GMC Sierra 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 2017 GMC Sierra 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 183

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 2017 GMC Sierra 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 2017 GMC Sierra - Reductant Control System Information Signal Message Counter Incorrect - AutoCodes.com — P143B 2017 GMC Sierra Code - Reductant Control System Information Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P143B 2017 GMC Sierra?

Faulty Reductant Control System

How to Fix the DTC P143B 2017 GMC Sierra?

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 2017 GMC Sierra 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 P143B 2017 GMC Sierra code?

Need more information on how to fix the P143B 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P143B 2017 GMC Sierra 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 2017 GMC Sierra Code

What does OBDII code P143B mean for a 2017 GMC Sierra?

OBDII code P143B indicates that there is an issue with the reductant control system, specifically that the information signal message counter is incorrect, which may affect the vehicle's emissions control system.

What symptoms might indicate a P143B code?

Symptoms may include the check engine light being illuminated, reduced engine power, or issues with the vehicle's ability to pass emissions testing.

What are common causes of the P143B code?

Common causes include faulty reductant control modules, wiring issues, software glitches, or problems with the vehicle's emissions system components that communicate with the reductant system.

Can I drive my GMC Sierra with a P143B code?

While it may be possible to drive the vehicle, it is not recommended, as it could lead to reduced engine performance and may cause further damage to the emissions system.

How can I diagnose the P143B code?

To diagnose the P143B code, you should use an OBDII scanner to read the code, inspect the reductant control module and associated wiring for damage, and check for any software updates or technical service bulletins related to the issue.

What are some potential repairs for a P143B code?

Repairs may include replacing the reductant control module, repairing or replacing damaged wiring, updating the vehicle's software, or addressing any other underlying issues with the emissions control system.

Will clearing the code fix the problem?

Clearing the code may turn off the check engine light temporarily, but if the underlying issue is not resolved, the code is likely to return.

Is there a risk of damaging my vehicle if I ignore the P143B code?

Yes, ignoring the P143B code can lead to further complications, such as more serious emissions issues or damage to the engine, which could result in costly repairs.

Should I seek professional help for a P143B code?

If you are not experienced with automotive repair or diagnostics, it is advisable to seek professional help to properly diagnose and fix the issue related to the P143B code.