P128F 2015 GMC Sierra Code - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
Quick Answer
The P128F diagnostic trouble code (DTC) on a 2015 GMC Sierra indicates that there is an issue with the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect. Common causes include Faulty fuel rail pressure sensors, Wiring or connector issues, ECM software glitch. 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 2015 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, ECM software glitch.
- 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 2015 GMC Sierra Description
The P128F diagnostic trouble code (DTC) on a 2015 GMC Sierra indicates that there is an issue with the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect. In simpler terms, this means that the ECM (Engine Control Module) has detected a discrepancy in the signals being sent by the fuel rail pressure sensors. These sensors are crucial components in the fuel delivery system, as they monitor and provide feedback on the pressure of the fuel in the fuel rail.
Common Causes of P128F 2015 GMC Sierra
- Faulty fuel rail pressure sensors
- Wiring or connector issues
- ECM software glitch
- Fuel system contamination
- Fuel pump malfunction
Symptoms of P128F 2015 GMC Sierra
- Decreased fuel efficiency
- Engine misfires or rough idling
- Difficulty starting the engine
- Loss of power during acceleration
- Illuminated check engine light
How to Fix P128F 2015 GMC Sierra
- Diagnose the issue using a scan tool to retrieve the specific DTC and check the fuel rail pressure sensor signals.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
- Test the fuel rail pressure sensors for proper functionality and replace them if they are found to be faulty.
- Clear the DTC from the ECM's memory and perform a test drive to ensure the issue has been resolved.
- If the problem persists, further diagnostics may be required to identify any underlying issues with the fuel system.
Cost to Fix P128F 2015 GMC Sierra
The typical repair costs for addressing a P128F code on a 2015 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the replacement of the fuel rail pressure sensors, potential wiring repairs, and diagnostic fees. It's important to note that the final cost may vary based on the shop's labor rates, parts prices, and any additional services required. Be sure to consult with a qualified technician for an accurate cost estimate tailored to your vehicle's needs.
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Frequently Asked Questions about P128F 2015 GMC Sierra Code
1. What does the OBDII code P128F mean on a 2015 GMC Sierra?
P128F indicates that the Fuel Rail Pressure Sensors 1 and 2 are sending signals with an incorrect message counter, suggesting a communication or correlation issue between the sensors.
2. What are the common symptoms of P128F on a 2015 GMC Sierra?
Symptoms may include a check engine light, reduced engine performance, rough idling, difficulty starting, or poor fuel efficiency.
3. What causes the P128F code to appear on a GMC Sierra?
The most common causes include faulty fuel rail pressure sensors, wiring issues such as damaged or corroded connections, or a malfunctioning ECM (engine control module).
4. Can I drive my 2015 GMC Sierra with the P128F code?
Driving with this code is not recommended, as it can lead to poor engine performance or potential damage if the fuel pressure is not regulated correctly.
5. How do I diagnose the P128F code on my GMC Sierra?
Start by using an OBDII scanner to confirm the code, then inspect the fuel rail pressure sensors, wiring, and connectors for damage. If no visible issues are found, test the sensors' output and communication with the ECM.
6. How do I fix the P128F code on a 2015 GMC Sierra?
Repairs may include replacing faulty fuel rail pressure sensors, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to fix the P128F code on a GMC Sierra?
Repair costs can vary, but replacing a fuel rail pressure sensor typically ranges from $150 to $350, including parts and labor. ECM repairs or replacements could be significantly higher.
8. Can a dirty fuel system cause the P128F code?
While a dirty fuel system is not a direct cause of this code, it can lead to fuel pressure irregularities that might exacerbate sensor issues.
9. Do I need to replace both fuel rail pressure sensors for the P128F code?
Not necessarily. Only replace the sensor that is faulty after diagnosing the issue. However, if both sensors are old or showing signs of wear, replacing them together may be a good preventive measure.
10. Will resetting the check engine light fix the P128F code?
Resetting the light will not fix the underlying issue. The code will likely return unless the root cause, such as a faulty sensor or wiring problem, is properly addressed.
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