P128F 2017 GMC Sierra Code - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
Quick Answer
The P128F diagnostic trouble code (DTC) for a 2017 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 or connector issues in the fuel rail pressure sensor circuit, ECM software or hardware malfunction. 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 2017 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 or connector issues in the fuel rail pressure sensor circuit, ECM software or hardware malfunction.
- 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 2017 GMC Sierra Description
The P128F diagnostic trouble code (DTC) for a 2017 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 not matching the expected values. The fuel rail pressure sensors are crucial components in the fuel system of the vehicle, as they monitor the pressure of the fuel in the fuel rail and send this information to the engine control module (ECM) to ensure proper fuel delivery and combustion.
Common Causes of P128F 2017 GMC Sierra
- Faulty fuel rail pressure sensors
- Wiring or connector issues in the fuel rail pressure sensor circuit
- ECM software or hardware malfunction
- Fuel system contamination or blockage
- Fuel pump failure or malfunction
Symptoms of P128F 2017 GMC Sierra
- Decreased fuel efficiency
- Rough idling or engine misfires
- Hesitation or lack of power during acceleration
- Engine stalling
- Check Engine Light illuminated on the dashboard
How to Fix P128F 2017 GMC Sierra
- Begin by using a diagnostic scanner to read and clear the DTC, then monitor the fuel rail pressure sensor signals to verify the issue.
- Inspect the wiring and connectors in the fuel rail pressure sensor circuit for any damage or corrosion, repairing or replacing as necessary.
- Test the fuel rail pressure sensors themselves for proper operation and replace them if they are found to be faulty.
- Check the fuel system for any contamination or blockages that could be affecting pressure readings, cleaning or replacing components as needed.
- If the issue persists, further diagnostic testing may be required to identify any underlying ECM issues or fuel pump problems.
Cost to Fix P128F 2017 GMC Sierra
The cost of repairing a P128F 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 replacing fuel rail pressure sensors can range from $150 to $300 per sensor, while diagnosing and repairing wiring or ECM issues may incur additional costs. Overall, you can expect to pay anywhere from $300 to $800 for parts and labor to address this issue. It is recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific needs. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.
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Frequently Asked Questions about P128F 2017 GMC Sierra Code
1. What does the OBDII code P128F mean on a 2017 GMC Sierra?
P128F indicates an issue with the Fuel Rail Pressure Sensors 1 and 2, where the signals or message counters from the sensors are inconsistent or incorrect.
2. What are the common symptoms of code P128F in a 2017 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel efficiency, difficulty starting, or the Check Engine Light being illuminated.
3. What causes the P128F code to appear on a GMC Sierra?
Possible causes include faulty fuel rail pressure sensors, wiring or connection issues, a malfunctioning fuel pump, or a problem with the engine control module (ECM).
4. Can a faulty fuel pump cause the P128F code?
Yes, a malfunctioning fuel pump can lead to fluctuating fuel pressure, which may trigger the P128F code.
5. How do you diagnose a P128F code on a 2017 GMC Sierra?
Diagnosis involves checking the fuel rail pressure sensors, inspecting the wiring and connectors, and using a scan tool to monitor sensor signals and fuel pressure readings.
6. Can driving with a P128F code damage my 2017 GMC Sierra?
Driving with this code may cause poor performance and could lead to engine damage if the fuel pressure is not properly regulated over time.
7. How do you fix the P128F code on a GMC Sierra?
Repairs may include replacing the faulty fuel rail pressure sensors, repairing damaged wiring or connectors, or addressing issues with the fuel pump or ECM.
8. How much does it cost to fix the P128F code?
Repair costs can vary but typically range from $200 to $500 depending on whether the issue is with the sensors, wiring, or fuel system components.
9. Can a software update fix the P128F code on a 2017 GMC Sierra?
In some cases, an ECM software update from the dealership may resolve the issue if it's caused by a programming error.
10. How can I prevent the P128F code from returning?
Regular maintenance, including inspecting fuel system components and ensuring proper electrical connections, can help prevent this code from reoccurring.
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