P128F GMC Code - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
Quick Answer
The P128F diagnostic trouble code for GMC vehicles indicates that the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect. Common causes include Faulty fuel rail pressure sensors, Wiring issues or corrosion in sensor connections, Malfunctioning ECM. 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 GMC 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 corrosion in sensor connections, Malfunctioning ECM.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P128F GMC Description
The P128F diagnostic trouble code for GMC vehicles indicates that the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect. This means that the signals being sent by the fuel rail pressure sensors are not being received properly by the vehicle's engine control module (ECM). The fuel rail pressure sensors are crucial components in the fuel system, as they monitor the pressure of the fuel in the rail and provide this information to the ECM for optimal fuel delivery and combustion.
Common Causes of P128F GMC
- Faulty fuel rail pressure sensors
- Wiring issues or corrosion in sensor connections
- Malfunctioning ECM
- Clogged fuel filter affecting fuel pressure
Symptoms of P128F GMC
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation or loss of power
- Engine misfires
- Illuminated check engine light
How to Fix P128F GMC
- Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific code and further information about the issue.
- Inspect the fuel rail pressure sensors, wiring, and connections for any visible damage or corrosion. Replace sensors if necessary.
- Test the fuel pressure using a gauge to ensure it is within the manufacturer's specifications.
- Reset the ECM and clear the diagnostic trouble code to see if the issue persists.
- If the problem persists, further diagnosis may be needed to pinpoint the exact cause, such as testing the ECM or fuel filter.
Cost to Fix P128F GMC
The typical repair costs for addressing a P128F code can vary depending on the specific cause of the issue. This could range from $200 to $500 for parts and labor. It's important to note that prices may fluctuate based on the location, make and model of the vehicle, and labor rates at different auto repair shops. Diagnostic time and labor rates can play a significant role in the final cost, so it's recommended to check with local shops for a more accurate estimate.
Need more information about the P128F GMC code?
Need more information on how to fix the P128F GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P128F GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P128F 2014 GMC Sierra — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
- P128F 2015 GMC Sierra — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
- P128F 2016 GMC Sierra — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
- P128F 2017 GMC Sierra — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
- P128F 2018 GMC Sierra — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
Frequently Asked Questions about P128F GMC Code
1. What does OBDII code P128F GMC indicate?
- This code indicates that there is an issue with the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect on a GMC vehicle.
2. What are the common symptoms of OBDII code P128F GMC?
- Common symptoms include rough idling, reduced engine performance, poor fuel economy, and possible stalling.
3. What are the possible causes of OBDII code P128F GMC?
- The code may be triggered by issues such as faulty fuel rail pressure sensors, wiring problems, sensor calibration errors, or issues with the engine control module.
4. How can I diagnose OBDII code P128F GMC?
- Diagnosis typically involves using a diagnostic scanner to read the code, checking the fuel rail pressure sensor readings, inspecting the wiring for damage, and verifying the sensor calibration.
5. Can I still drive my vehicle with OBDII code P128F GMC?
- It is not recommended to drive the vehicle with this code present, as it can lead to further engine damage or safety issues. It's best to address the problem promptly.
6. How can I repair OBDII code P128F GMC?
- Repair options may include replacing the faulty fuel rail pressure sensors, repairing any damaged wiring, recalibrating the sensors, or resetting the engine control module.
7. Are there any DIY tips for addressing OBDII code P128F GMC?
- DIY enthusiasts may attempt to inspect the wiring for visible damage, clean the sensors, or reset the engine control module. However, for complex issues, it's best to consult a professional.
8. How much does it cost to fix OBDII code P128F GMC?
- The cost of repairs can vary depending on the underlying issue, the labor rates in your area, and whether you choose OEM or aftermarket parts. It's advisable to get quotes from different mechanics.
9. Can a fuel system cleaner help with OBDII code P128F GMC?
- While a fuel system cleaner may help with general maintenance, it is unlikely to resolve the specific issue related to the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect. It's best to address the root cause directly.
10. How can I prevent OBDII code P128F GMC from recurring?
- To prevent the code from recurring, ensure regular maintenance of your fuel system, address any issues promptly, and follow the manufacturer's recommended service schedule.
Discuss the causes and fixes for P128F GMC OBDII Code
Code P128F GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.