P128C 2017 GMC Sierra Code - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
Quick Answer
The P128C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Fuel Rail Temperature Sensor 1 Signal Message Counter being incorrect. Common causes include Faulty fuel rail temperature sensor, Wiring or connector issues in the sensor circuit, ECM software or programming issues. 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
- P128C 2017 GMC Sierra indicates Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty fuel rail temperature sensor, Wiring or connector issues in the sensor circuit, ECM software or programming issues.
- 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 P128C 2017 GMC Sierra Description
The P128C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Fuel Rail Temperature Sensor 1 Signal Message Counter being incorrect. The fuel rail temperature sensor is a crucial component in the vehicle's fuel system, as it measures the temperature of the fuel in the fuel rail. This information is essential for the engine control module (ECM) to adjust the fuel mixture and timing to optimize engine performance and fuel efficiency.
Common Causes of P128C 2017 GMC Sierra
- Faulty fuel rail temperature sensor
- Wiring or connector issues in the sensor circuit
- ECM software or programming issues
- Fuel system contamination affecting sensor readings
- Extreme temperature fluctuations affecting sensor accuracy
Symptoms of P128C 2017 GMC Sierra
- Check engine light illuminated on the dashboard
- Poor fuel economy
- Rough idling or engine misfires
- Hesitation or lack of power during acceleration
- Engine stalling or difficulty starting
How to Fix P128C 2017 GMC Sierra
- Begin by conducting a thorough inspection of the fuel rail temperature sensor, wiring, and connectors for any visible damage or corrosion.
- Test the sensor using a multimeter to check for proper resistance and voltage readings.
- If the sensor is faulty, replace it with a new, OEM-quality sensor.
- Clear the DTC from the ECM memory using a diagnostic scan tool.
- Test drive the vehicle to ensure the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P128C 2017 GMC Sierra
The typical repair costs for addressing a P128C DTC on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of a new fuel rail temperature sensor ranges from $50 to $150, depending on the brand and quality. Labor costs for sensor replacement and diagnostic testing can range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total repair cost for this issue is estimated to be between $150 and $450. It is advisable to consult with a trusted auto repair shop for a more accurate cost estimate based on your location and vehicle specifics.
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Frequently Asked Questions about P128C 2017 GMC Sierra Code
1. What does the OBDII code P128C mean on a 2017 GMC Sierra?
P128C indicates that the Fuel Rail Temperature Sensor 1 is sending an incorrect signal message counter to the engine control module (ECM).
2. What are the common symptoms of code P128C?
Symptoms may include reduced engine performance, poor fuel economy, difficulty starting, or the check engine light being illuminated.
3. What causes the P128C code to appear?
Common causes include a faulty fuel rail temperature sensor, damaged wiring or connectors, or a malfunctioning ECM.
4. Can I drive my 2017 GMC Sierra with the P128C code?
While it may be possible to drive, it’s not recommended as it could lead to further engine performance issues or potential damage.
5. How do you diagnose the P128C code on a 2017 GMC Sierra?
Diagnosis involves using a scan tool to confirm the code, inspecting the wiring and connectors for damage, and testing the fuel rail temperature sensor for proper functionality.
6. How do you fix the P128C code?
Repairs include replacing the faulty fuel rail temperature sensor, repairing or replacing damaged wiring or connectors, or reprogramming the ECM if necessary.
7. How much does it cost to fix the P128C code on a GMC Sierra?
Costs can vary, but replacing the fuel rail temperature sensor typically ranges from $150 to $300, including parts and labor.
8. Can a bad fuel rail temperature sensor cause other problems?
Yes, a faulty sensor can lead to incorrect fuel delivery, reduced engine efficiency, and potential long-term engine damage.
9. What tools are needed to fix the P128C code?
Common tools include a scan tool, multimeter for testing wiring, and basic hand tools for sensor replacement.
10. Is the P128C code covered under warranty for a 2017 GMC Sierra?
It depends on your vehicle's warranty status and coverage, but emissions-related components may be covered under the federal emissions warranty. Check with your dealer for details.
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