P129E 2016 GMC Sierra Code - Fuel Pump Driver Control Module Signal Message Counter Incorrect
Quick Answer
The Fuel Pump Power Control Module is constantly sending serial data messages to the Engine Control Module (ECM) regarding the operating state of the fuel pump power control system. Common causes include Faulty Fuel Pump Power Control Module, Fuel Pump Power Control Module harness is open or shorted, Fuel Pump Power Control Module circuit poor electrical connection. 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
- P129E 2016 GMC Sierra indicates Fuel Pump Driver Control Module Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Pump Power Control Module, Fuel Pump Power Control Module harness is open or shorted, Fuel Pump Power Control Module circuit poor electrical connection.
- 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 P129E 2016 GMC Sierra Description
What are the Possible Causes of the DTC P129E 2016 GMC Sierra?
- Faulty Fuel Pump Power Control Module
- Fuel Pump Power Control Module harness is open or shorted
- Fuel Pump Power Control Module circuit poor electrical connection
How to Fix the DTC P129E 2016 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 P129E 2016 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 P129E 2016 GMC Sierra Code
1. What does the OBDII code P129E mean on a 2016 GMC Sierra?
P129E indicates that the Fuel Pump Driver Control Module (FPCM) has detected an incorrect signal message counter, which suggests a communication issue or a malfunction in the module.
2. What are the common symptoms of code P129E on a 2016 GMC Sierra?
Symptoms may include difficulty starting the engine, reduced engine performance, stalling, or an illuminated check engine light.
3. What causes the P129E code on a 2016 GMC Sierra?
Common causes include a faulty Fuel Pump Driver Control Module (FPCM), damaged wiring or connectors, a software issue, or a problem with the fuel pump itself.
4. How can I diagnose the P129E code on my 2016 GMC Sierra?
Start by checking the wiring and connectors to the Fuel Pump Driver Control Module for damage or corrosion. Use a scan tool to verify communication with the FPCM and check for related codes.
5. Can a bad fuel pump cause the P129E code?
While the fuel pump itself is not the typical cause, issues with the fuel pump can indirectly contribute to the code if they affect the FPCM's operation.
6. Is it safe to drive my 2016 GMC Sierra with the P129E code?
Driving with the P129E code may lead to reduced performance or stalling, which could be unsafe. It's best to address the issue as soon as possible.
7. How do I fix the P129E code on a 2016 GMC Sierra?
Repairs may involve replacing the Fuel Pump Driver Control Module, repairing or replacing damaged wiring or connectors, or updating the module’s software if a programming issue exists.
8. How much does it cost to repair the P129E code on a 2016 GMC Sierra?
Repair costs vary but typically range from $200 to $600, depending on whether the FPCM needs replacement or if wiring repairs are required.
9. Can updating the software fix the P129E code?
In some cases, a software update for the Fuel Pump Driver Control Module may resolve the issue if it's caused by a programming error.
10. Do I need professional help to resolve the P129E code on my 2016 GMC Sierra?
While basic checks like inspecting wiring can be done at home, diagnosing and repairing the FPCM or performing software updates typically require professional tools and expertise.
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