P128F 2016 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 2016 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC P128F 2016 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 2016 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 2016 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 2016 GMC Sierra Code
1. What does the OBDII code P128F mean on a 2016 GMC Sierra?
P128F indicates that the Fuel Rail Pressure Sensors 1 and 2 have signals with an incorrect message counter or mismatch, which can disrupt fuel system performance.
2. What are the common symptoms of code P128F in a 2016 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel efficiency, rough idling, difficulty starting, and the illumination of the check engine light.
3. What causes the P128F code to appear on a 2016 GMC Sierra?
Common causes include faulty fuel rail pressure sensors, wiring or connection issues, a malfunctioning ECM (Engine Control Module), or a software glitch.
4. Can a dirty fuel system trigger the P128F code?
While not a direct cause, a dirty fuel system can lead to pressure irregularities that may exacerbate sensor signal issues.
5. How do you diagnose the P128F code in a 2016 GMC Sierra?
Diagnosis typically involves scanning the system with an OBDII scanner, inspecting the fuel rail pressure sensors and their wiring, and testing the ECM for proper communication.
6. Can I drive my 2016 GMC Sierra with the P128F code active?
Driving is possible but not recommended, as it may lead to further performance issues or potential damage to the fuel system.
7. How do you fix the P128F code in a 2016 GMC Sierra?
Repairs may involve replacing faulty fuel rail pressure sensors, repairing damaged wiring, updating ECM software, or replacing the ECM if necessary.
8. Are software updates a common fix for the P128F code?
Yes, in some cases, manufacturers release ECM software updates to address communication problems related to fuel rail pressure sensors.
9. How much does it cost to repair the P128F code on a 2016 GMC Sierra?
Repair costs can range from $150 to $500, depending on whether the issue lies with the sensors, wiring, or ECM.
10. Can a failing ECM cause the P128F code?
Yes, a failing ECM can misinterpret sensor signals or fail to process them correctly, leading to this code.
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