P129C 2017 GMC Sierra Code - Fuel Pump Driver Control Module System Voltage High
Quick Answer
The P129C diagnostic trouble code for the 2017 GMC Sierra indicates a problem with the Fuel Pump Driver Control Module System Voltage being too high. Common causes include Faulty Fuel Pump Driver Control Module: A malfunctioning fuel pump driver control module can lead to high voltage issues, Wiring Problems: Corrosion, damage, or loose connections in the wiring harness can cause voltage irregularities in the fuel pump driver control module, Electrical Issues: Problems with the vehicle's electrical system, such as a faulty alternator or battery, can result in high voltage in the fuel pump driver control module. 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
- P129C 2017 GMC Sierra indicates Fuel Pump Driver Control Module System Voltage High.
- Common causes
- Common causes include Faulty Fuel Pump Driver Control Module: A malfunctioning fuel pump driver control module can lead to high voltage issues, Wiring Problems: Corrosion, damage, or loose connections in the wiring harness can cause voltage irregularities in the fuel pump driver control module, Electrical Issues: Problems with the vehicle's electrical system, such as a faulty alternator or battery, can result in high voltage in the fuel pump driver control module.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P129C 2017 GMC Sierra Description
The P129C diagnostic trouble code for the 2017 GMC Sierra indicates a problem with the Fuel Pump Driver Control Module System Voltage being too high. The Fuel Pump Driver Control Module is responsible for controlling the fuel pump operation and ensuring the correct fuel pressure is maintained in the fuel system. When the system voltage is too high, it can lead to various issues that can affect the vehicle's performance and potentially cause long-term damage if not addressed promptly.
Common Causes of P129C 2017 GMC Sierra
- Faulty Fuel Pump Driver Control Module: A malfunctioning fuel pump driver control module can lead to high voltage issues.
- Wiring Problems: Corrosion, damage, or loose connections in the wiring harness can cause voltage irregularities in the fuel pump driver control module.
- Electrical Issues: Problems with the vehicle's electrical system, such as a faulty alternator or battery, can result in high voltage in the fuel pump driver control module.
- Software Glitch: An issue with the vehicle's engine control module (ECM) software or programming can cause the system voltage to be too high.
Symptoms of P129C 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with the P129C code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Fuel Efficiency: High voltage in the fuel pump driver control module can lead to increased fuel consumption and reduced fuel efficiency.
- Engine Surging: The engine may surge or hesitate during acceleration or idle due to the irregular fuel pump operation.
- Hard Starting: The vehicle may experience difficulty starting or may require multiple attempts to start the engine.
- Reduced Engine Performance: The vehicle may exhibit a decrease in overall engine performance, including power output and responsiveness.
How to Fix P129C 2017 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform tests to pinpoint the exact cause of the high voltage in the fuel pump driver control module.
- Inspect Wiring and Connections: Check the wiring harness for any damage, corrosion, or loose connections. Repair or replace any faulty wiring as necessary.
- Test Fuel Pump Driver Control Module: Test the fuel pump driver control module to determine if it is functioning correctly. Replace the module if it is found to be faulty.
- Check Electrical System: Inspect the vehicle's alternator, battery, and other electrical components to ensure they are operating within specifications. Replace any faulty components.
- Clear Codes and Test Drive: Clear the trouble codes from the vehicle's ECM, and test drive the vehicle to ensure the issue has been resolved. Monitor the system voltage to verify that it is within the appropriate range.
Cost to Fix P129C 2017 GMC Sierra
The cost of repairing the P129C code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $300. This brings the total repair cost to approximately $300 to $800. However, it's essential to note that these are rough estimates, and the actual cost may vary based on the severity of the issue and the rates charged by the auto repair shop. Be sure to consult with a professional mechanic to get an accurate quote for your specific situation.
Need more information about the P129C 2017 GMC Sierra code?
Need more information on how to fix the P129C 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P129C 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P129C 2017 GMC Sierra Code
1. What are the common symptoms of OBDII code P129C in a 2017 GMC Sierra?
The common symptoms of code P129C include issues with starting the vehicle, reduced engine power, and possible stalling.
2. What does the OBDII code P129C on a 2017 GMC Sierra indicate?
Code P129C indicates a problem with the Fuel Pump Driver Control Module System Voltage being too high in the vehicle.
3. What are the possible causes of OBDII code P129C in a 2017 GMC Sierra?
Possible causes of code P129C include a faulty fuel pump driver control module, issues with the fuel pump, wiring problems, or a problem with the vehicle's power supply.
4. How can I diagnose the OBDII code P129C in my 2017 GMC Sierra?
Diagnosing code P129C involves using a scan tool to check for the code, inspecting the fuel pump driver control module and related components, and testing the voltage levels in the system.
5. Can I still drive my 2017 GMC Sierra with OBDII code P129C?
It is not recommended to drive your vehicle with code P129C as it can lead to performance issues and potential stalling, which can be dangerous.
6. How can I repair OBDII code P129C in my 2017 GMC Sierra?
Repairing code P129C involves addressing the root cause, which may include replacing the fuel pump driver control module, repairing wiring issues, or fixing problems with the fuel pump.
7. Is it possible to reset OBDII code P129C in a 2017 GMC Sierra?
While you can clear the code with a scan tool, it is important to address the underlying issue causing code P129C to prevent it from reoccurring.
8. Are there any DIY fixes for OBDII code P129C in a 2017 GMC Sierra?
DIY fixes for code P129C may include checking and cleaning the electrical connections, inspecting the wiring for damage, and ensuring the fuel pump driver control module is securely connected.
9. How much does it cost to fix OBDII code P129C in a 2017 GMC Sierra?
The cost of fixing code P129C can vary depending on the root cause of the issue, with potential costs including parts and labor for component replacement or repairs.
10. Can OBDII code P129C in a 2017 GMC Sierra cause further damage if left untreated?
Leaving code P129C untreated can potentially cause further damage to the fuel system components and may lead to more severe performance issues with the vehicle over time.
Discuss the causes and fixes for P129C 2017 GMC Sierra OBDII Code
Code P129C 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.