P128F 2014 GMC Sierra Code - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
Quick Answer
The fuel rail pressure sensor transmits fuel pressure and temperature information by serial data. Common causes include Faulty Fuel Rail Pressure Sensor, Fuel Rail Pressure Sensor harness is open or shorted, Fuel Rail Pressure Sensor 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
- 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 Sensor, Fuel Rail Pressure Sensor harness is open or shorted, Fuel Rail Pressure Sensor 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 P128F 2014 GMC Sierra Description
What are the Possible Causes of the DTC P128F 2014 GMC Sierra?
- Faulty Fuel Rail Pressure Sensor
- Fuel Rail Pressure Sensor harness is open or shorted
- Fuel Rail Pressure Sensor circuit poor electrical connection
How to Fix the DTC P128F 2014 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 P128F 2014 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 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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