P128F 2014 GMC Sierra Code - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
Quick Answer
The P128F diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is an issue with the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter being incorrect. Common causes include Faulty fuel rail pressure sensors, Wiring issues or electrical connections, Malfunctioning fuel pump. 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
- P128F 2014 GMC Sierra indicates Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect.
- Common causes
- Common causes include Faulty fuel rail pressure sensors, Wiring issues or electrical connections, Malfunctioning fuel pump.
- 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.
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Code P128F 2014 GMC Sierra Description
The P128F diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is an issue with the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter being incorrect. This code typically points to a problem with the signals being sent by the fuel rail pressure sensors, which are responsible for monitoring the pressure of the fuel in the fuel rail. The fuel rail pressure sensors play a crucial role in ensuring that the engine receives the correct amount of fuel for optimal performance and efficiency.
Common Causes of P128F 2014 GMC Sierra
- Faulty fuel rail pressure sensors
- Wiring issues or electrical connections
- Malfunctioning fuel pump
- Problem with the fuel pressure regulator
- Issues with the fuel system or fuel injectors
Symptoms of P128F 2014 GMC Sierra
- Engine hesitation or lack of power
- Rough idling or stalling
- Difficulty starting the engine
- Decreased fuel efficiency
- Check Engine Light illuminated on the dashboard
How to Fix P128F 2014 GMC Sierra
- Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific fault codes and confirm the issue.
- Inspect the fuel rail pressure sensors, wiring, and connections for any signs of damage or corrosion. Replace any faulty components.
- Test the fuel pump and fuel pressure regulator to ensure they are functioning correctly. Replace if necessary.
- Clear the fault codes from the vehicle's computer and perform a test drive to verify that the issue has been resolved.
- If the problem persists, further diagnostics may be required to pinpoint the exact cause of the issue.
Cost to Fix P128F 2014 GMC Sierra
The typical repair costs for addressing a P128F code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing faulty fuel rail pressure sensors can cost between $150 and $300 per sensor, while addressing wiring or electrical issues may range from $100 to $200. If the fuel pump or fuel pressure regulator needs to be replaced, the cost can range from $300 to $600 or more. Labor costs can add an additional $80 to $150 per hour, and the total repair bill can vary based on the extent of the repairs needed. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.
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Frequently Asked Questions about P128F 2014 GMC Sierra Code
1. What does the OBDII code P128F mean on a 2014 GMC Sierra?
P128F indicates an issue with the Fuel Rail Pressure Sensors 1 and 2, where the message counters between the two sensors are not matching, suggesting a communication error or malfunction.
2. What are the common symptoms of the P128F code?
Common symptoms include poor engine performance, rough idling, hesitation during acceleration, reduced fuel efficiency, and potentially the Check Engine Light being illuminated.
3. What causes the P128F code to appear on a 2014 GMC Sierra?
The most common causes are a faulty fuel rail pressure sensor, wiring issues (such as damaged or corroded connectors), or software glitches in the powertrain control module (PCM).
4. Can I drive my 2014 GMC Sierra with a P128F code?
While it may be possible to drive with this code, it’s not recommended as it can lead to engine performance issues and potentially cause further damage if the fuel pressure system is not functioning properly.
5. How do I diagnose the P128F code on my GMC Sierra?
Start by checking the wiring and connectors for damage or corrosion. Use a scan tool to monitor the fuel rail pressure sensor data and compare the readings from sensors 1 and 2 to identify inconsistencies.
6. What is the most common fix for the P128F code?
The most common fix is replacing the faulty fuel rail pressure sensor. In some cases, repairing damaged wiring or updating the PCM software may resolve the issue.
7. How much does it cost to fix the P128F code?
The repair cost can vary, but replacing a fuel rail pressure sensor typically costs between $200 and $400, including parts and labor. Wiring repairs or PCM updates may have different costs.
8. Can a fuel pump issue trigger the P128F code?
While rare, a failing fuel pump or inconsistent fuel delivery could cause pressure sensor discrepancies, potentially triggering this code.
9. Do I need to reset the PCM after fixing the P128F code?
Yes, after completing the repair, clear the code using an OBDII scan tool and perform a drive cycle to ensure the issue is resolved and the code does not return.
10. Could a dirty fuel filter cause the P128F code?
A clogged fuel filter is unlikely to directly cause the P128F code, but it can contribute to inconsistent fuel pressure, which may exacerbate the issue.
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