P128C 2015 GMC Sierra Code - Fuel Rail Temperature Sensor 1 Signal 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 Temperature Sensor 1, Fuel Rail Temperature Sensor 1 harness is open or shorted, Fuel Rail Temperature Sensor 1 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
- P128C 2015 GMC Sierra indicates Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Rail Temperature Sensor 1, Fuel Rail Temperature Sensor 1 harness is open or shorted, Fuel Rail Temperature Sensor 1 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 P128C 2015 GMC Sierra Description
What are the Possible Causes of the DTC P128C 2015 GMC Sierra?
- Faulty Fuel Rail Temperature Sensor 1
- Fuel Rail Temperature Sensor 1 harness is open or shorted
- Fuel Rail Temperature Sensor 1 circuit poor electrical connection
How to Fix the DTC P128C 2015 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 P128C 2015 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 P128C 2015 GMC Sierra Code
1. What does the OBDII code P128C mean on a 2015 GMC Sierra?
P128C indicates that the fuel rail temperature sensor 1 signal message counter is incorrect, often due to communication or sensor issues.
2. What are the symptoms of code P128C on a GMC Sierra?
Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, or an illuminated check engine light.
3. What causes the P128C code to appear?
This code can be caused by a faulty fuel rail temperature sensor, wiring issues, a malfunctioning Engine Control Module (ECM), or communication errors in the sensor circuit.
4. Can I still drive my GMC Sierra with a P128C code?
While the vehicle may still run, driving with this code can lead to performance issues and potential long-term damage. It’s best to address it promptly.
5. How do I diagnose the P128C code on my GMC Sierra?
Start by inspecting the fuel rail temperature sensor and its wiring for damage or loose connections. Use a scan tool to monitor sensor data and check for related communication errors.
6. How do I fix the P128C code on a 2015 GMC Sierra?
Repairs may include replacing the fuel rail temperature sensor, repairing damaged wiring, updating the ECM software, or replacing the ECM if necessary.
7. How much does it cost to repair a P128C code?
The cost depends on the issue, but replacing a fuel rail temperature sensor typically costs $100–$300, including parts and labor.
8. Can a software update fix the P128C code?
In some cases, a software update for the ECM can resolve communication issues related to this code. Check with your dealer or mechanic.
9. What tools do I need to troubleshoot the P128C code?
You’ll need an OBDII scanner, a multimeter to check wiring, and possibly a service manual or wiring diagram specific to your vehicle.
10. Is the P128C code a common issue on the 2015 GMC Sierra?
While not extremely common, issues with the fuel rail temperature sensor or its circuit can occasionally trigger this code on certain GMC Sierra models.
Discuss the causes and fixes for P128C 2015 GMC Sierra OBDII Code
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