P127C 2017 GMC Sierra Code - Fuel Rail Pressure Sensor 2 Circuit Low Voltage
Quick Answer
The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to constantly adjust the high-pressure fuel pump's feed rate so that the ideal pressure is permanently maintained in the high-pressure section (between the high-pressure fuel pump and the injectors) by means of closed-loop control. Common causes include Low or no fuel, Faulty Fuel Rail Pressure Sensor 2, Fuel Rail Pressure Sensor 2 harness is open or shorted. 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
- P127C 2017 GMC Sierra indicates Fuel Rail Pressure Sensor 2 Circuit Low Voltage.
- Common causes
- Common causes include Low or no fuel, Faulty Fuel Rail Pressure Sensor 2, Fuel Rail Pressure Sensor 2 harness is open or shorted.
- 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 P127C 2017 GMC Sierra Description
What are the Possible Causes of the DTC P127C 2017 GMC Sierra?
- Low or no fuel
- Faulty Fuel Rail Pressure Sensor 2
- Fuel Rail Pressure Sensor 2 harness is open or shorted
- Fuel Rail Pressure Sensor 2 circuit poor electrical connection
- Faulty Fuel Pump
How to Fix the DTC P127C 2017 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 P127C 2017 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.
Need more information about the P127C 2017 GMC Sierra code?
Need more information on how to fix the P127C 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
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Frequently Asked Questions about P127C 2017 GMC Sierra Code
1. What are common symptoms of OBDII code P127C on a 2017 GMC Sierra related to the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?
The common symptoms may include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling issues.
2. What are the possible causes of the OBDII code P127C on a 2017 GMC Sierra?
Possible causes may include a faulty fuel rail pressure sensor, wiring issues in the sensor circuit, low fuel pressure, or a problem with the engine control module.
3. How can I diagnose the cause of OBDII code P127C on my 2017 GMC Sierra?
Diagnosis typically involves using a scan tool to retrieve the code, checking the sensor's wiring and connections for any damage, testing the fuel pressure, and inspecting the sensor itself for any signs of damage or malfunction.
4. Can a dirty fuel filter trigger OBDII code P127C on a 2017 GMC Sierra?
Yes, a clogged or dirty fuel filter can lead to low fuel pressure, which in turn may trigger the P127C code due to inadequate fuel reaching the fuel rail pressure sensor.
5. Is it safe to continue driving my 2017 GMC Sierra with OBDII code P127C active?
It is not recommended to drive the vehicle with the P127C code active, as it can lead to further engine damage or performance issues. It is advisable to address the issue promptly.
6. What are some repair tips for fixing OBDII code P127C on a 2017 GMC Sierra?
Repair tips may include replacing the fuel rail pressure sensor, checking and repairing any damaged wiring, ensuring proper fuel pressure, and clearing the code with a diagnostic tool after the repair.
7. Can a loose gas cap trigger the OBDII code P127C on a 2017 GMC Sierra?
While a loose gas cap is unlikely to directly cause the P127C code, it is always a good practice to ensure the gas cap is properly tightened to prevent other issues related to the fuel system.
8. How much does it typically cost to repair OBDII code P127C on a 2017 GMC Sierra?
The cost of repairing the P127C code can vary depending on the exact cause of the issue, but it may involve parts and labor costs ranging from $100 to $500 or more, depending on the extent of the repairs needed.
9. Can weather conditions affect the occurrence of OBDII code P127C on a 2017 GMC Sierra?
Extreme weather conditions, such as very cold temperatures affecting fuel pressure, could potentially contribute to triggering the P127C code, but it is more commonly caused by sensor or wiring issues.
10. How often should the fuel rail pressure sensor be inspected or replaced on a 2017 GMC Sierra to prevent OBDII code P127C?
It is recommended to follow the manufacturer's maintenance schedule for inspections and replacements of components like the fuel rail pressure sensor to prevent issues like the P127C code.
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