P143A 2015 GMC Sierra 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 GMC Sierra 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.
Code P143A 2015 GMC Sierra Description
What are the Possible Causes of the DTC P143A 2015 GMC Sierra?
- Faulty Reductant Control System
How to Fix the DTC P143A 2015 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 P143A 2015 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 P143A 2015 GMC Sierra code?
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Frequently Asked Questions about P143A 2015 GMC Sierra Code
1. What does the OBDII code P143A mean on a 2015 GMC Sierra?
The P143A code indicates an issue with the Reductant Control System, specifically that the diagnostic signal message counter is incorrect, often related to the DEF (Diesel Exhaust Fluid) system.
2. What are the symptoms of the P143A code in a 2015 GMC Sierra?
Symptoms may include the check engine light turning on, warnings about the DEF system, reduced engine power, or a failure to properly regulate emissions.
3. What causes the P143A code to appear on a 2015 GMC Sierra?
Common causes include a malfunctioning reductant control module, wiring or electrical connection issues, or software glitches in the DEF system.
4. Can I drive my 2015 GMC Sierra with the P143A code?
While the truck may still be drivable, ignoring this code can lead to reduced engine performance or non-compliance with emissions standards, so it should be addressed promptly.
5. How do I diagnose the P143A code on my 2015 GMC Sierra?
Diagnosis involves scanning for codes, inspecting the reductant control module and its wiring, and checking the DEF system components for proper operation.
6. How do you fix the P143A code on a 2015 GMC Sierra?
Repairs may involve replacing the reductant control module, repairing damaged wiring, updating the vehicle’s software, or addressing issues with the DEF system.
7. Does the P143A code require a software update to fix?
In some cases, a software update for the reductant control module or ECM may resolve the issue, but this should be confirmed through diagnosis.
8. Is the P143A code covered under warranty for a 2015 GMC Sierra?
Depending on your vehicle’s mileage and warranty terms, emissions-related repairs like this may be covered under the emissions warranty.
9. Can a bad DEF system cause the P143A code?
Yes, issues with the DEF system, such as a failing DEF pump or sensor, can trigger the P143A code by disrupting the reductant control system.
10. What tools are needed to troubleshoot the P143A code on a 2015 GMC Sierra?
You’ll need an advanced OBDII scanner capable of reading manufacturer-specific codes and potentially tools to test wiring and module connections.
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