P143A 2014 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 2014 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 2014 GMC Sierra Description
What are the Possible Causes of the DTC P143A 2014 GMC Sierra?
- Faulty Reductant Control System
How to Fix the DTC P143A 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 P143A 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 P143A 2014 GMC Sierra Code
1. What does the OBDII code P143A mean on a 2014 GMC Sierra?
The P143A code indicates an issue with the reductant control system, specifically that the diagnostic signal message counter is incorrect.
2. What are the common symptoms of the P143A code in a 2014 GMC Sierra?
Symptoms may include the check engine light turning on, reduced engine power, and possible DEF (Diesel Exhaust Fluid) system warnings on the dashboard.
3. What causes the P143A code in a 2014 GMC Sierra?
Common causes include faulty reductant control module software, communication errors between the control module and other systems, or damaged wiring/connectors in the reductant system.
4. Can a bad reductant control module cause the P143A code?
Yes, a malfunctioning reductant control module can cause the P143A code due to incorrect message counter signals being sent or received.
5. How do you diagnose the P143A code on a 2014 GMC Sierra?
Diagnosis involves using a scan tool to check for additional codes, inspecting the reductant control module, verifying wiring integrity, and testing communication signals.
6. Can I still drive my 2014 GMC Sierra with the P143A code?
While the vehicle may still be drivable, ignoring the code can lead to more severe issues with the DEF system and potential engine performance problems.
7. How do you fix the P143A code on a 2014 GMC Sierra?
Repairs may include updating the reductant control module software, replacing faulty wiring or connectors, or replacing the reductant control module if it’s defective.
8. Is the P143A code related to the DEF system?
Yes, the P143A code is directly related to the DEF system, as the reductant control module manages Diesel Exhaust Fluid delivery to reduce emissions.
9. How much does it cost to fix the P143A code on a 2014 GMC Sierra?
Repair costs vary but can range from $100 to $800, depending on whether simple wiring repairs or control module replacement is needed.
10. Can a software update resolve the P143A code in my 2014 GMC Sierra?
Yes, in some cases, updating the reductant control module software can resolve the P143A code if the issue is software-related.
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