P143B 2014 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 2014 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.
Code P143B 2014 GMC Sierra Description
What are the Possible Causes of the DTC P143B 2014 GMC Sierra?
- Faulty Reductant Control System
How to Fix the DTC P143B 2014 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 2014 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.
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Frequently Asked Questions about P143B 2014 GMC Sierra Code
1. What does the OBDII code P143B mean on a 2014 GMC Sierra?
The P143B code indicates an issue with the Reductant Control System, specifically that the Information Signal Message Counter is incorrect.
2. What are the common symptoms of the P143B code?
Symptoms may include a check engine light, reduced engine power, warning messages about the DEF (Diesel Exhaust Fluid) system, or the vehicle entering limp mode.
3. What causes the P143B code to appear?
The code is often caused by communication errors between the Engine Control Module (ECM) and the Reductant Control Module, a faulty module, wiring issues, or software glitches.
4. Can a failing DEF system cause the P143B code?
Yes, a malfunction in the DEF system, such as a faulty DEF pump or sensor, can lead to communication issues triggering the P143B code.
5. How do you diagnose the P143B code?
Diagnosis involves scanning for additional codes, inspecting the wiring and connectors between the ECM and Reductant Control Module, and testing the module for proper operation.
6. Is it safe to drive with the P143B code?
Driving with this code is not recommended, as it can lead to reduced engine performance or the vehicle entering limp mode, potentially stranding you.
7. How can I fix the P143B code on a 2014 GMC Sierra?
Fixes may include repairing or replacing damaged wiring, reprogramming or replacing the Reductant Control Module, or performing a software update in the ECM.
8. Can a software update resolve the P143B code?
Yes, in some cases, a software update for the ECM or Reductant Control Module can resolve communication errors and clear the code.
9. What tools are needed to troubleshoot the P143B code?
You’ll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for checking wiring, and possibly a scan tool for module reprogramming.
10. How much does it cost to repair the P143B code?
Repair costs vary depending on the issue, ranging from $100 for a simple wiring fix to $1,000 or more for module replacement and programming.
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