P143A 2017 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 2017 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC P143A 2017 GMC Sierra?
- Faulty Reductant Control System
How to Fix the DTC P143A 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 P143A 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 P143A 2017 GMC Sierra code?
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Frequently Asked Questions about P143A 2017 GMC Sierra Code
1. What does the OBDII code P143A mean on a 2017 GMC Sierra?
P143A indicates an issue with the Reductant Control System, specifically that the diagnostic signal message counter is incorrect. This often relates to communication errors within the diesel exhaust fluid (DEF) system.
2. What are the symptoms of code P143A in a 2017 GMC Sierra?
Common symptoms include a check engine light, DEF system warnings, reduced engine performance, or issues with the truck entering "limp mode."
3. What causes the P143A code to appear in a 2017 GMC Sierra?
The code is typically caused by a fault in the reductant control module, wiring issues, software glitches, or a problem with communication between the engine control module (ECM) and the reductant module.
4. Can I drive my 2017 GMC Sierra with a P143A code?
Driving with this code may be possible initially, but ignoring it can lead to reduced engine performance, DEF system malfunctions, or the truck entering "limp mode," which limits speed and power.
5. How is the P143A code diagnosed in a 2017 GMC Sierra?
A technician will use a scan tool to confirm the code, inspect wiring and connections for damage, and check for communication errors between the ECM and reductant control module.
6. What repairs can fix the P143A code in a 2017 GMC Sierra?
Repairs may include updating module software, repairing or replacing damaged wiring, or replacing the reductant control module if it's found to be faulty.
7. Are there any recalls for the P143A code on the 2017 GMC Sierra?
As of now, there are no specific recalls for this code, but it's worth checking with a GMC dealer for any relevant software updates or service bulletins.
8. How much does it cost to fix the P143A code on a 2017 GMC Sierra?
Repair costs will vary but may range from $100 to $1,000 depending on whether the issue is a simple wiring fix or a replacement of the reductant control module.
9. Can clearing the P143A code temporarily solve the problem?
Clearing the code may reset the warning temporarily, but if the underlying issue isn’t addressed, the code will likely return.
10. How can I prevent the P143A code from occurring again in my 2017 GMC Sierra?
Regular DEF system maintenance, keeping software up to date, and ensuring wiring connections are secure can help prevent this code from reoccurring.
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