AutoCodes – Chevrolet – P127C Chevrolet

P127C Chevrolet 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 Chevrolet 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.

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Code Popularity 7,918

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 30, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P127C Chevrolet Description

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. The fuel rail pressure sensor transmits fuel pressure and temperature information via serial data to the ECM. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low. The ECM controls the fuel pressure regulator, which regulates high-pressure fuel that goes to the fuel injector rails and the injectors. The Diagnostic Trouble Code (DTC) will be set if the Fuel Rail Pressure Sensor 2 signal is less than a predefined threshold for greater than 1s.

OBDII Code P127C Chevrolet - Fuel Rail Pressure Sensor 2 Circuit Low Voltage - AutoCodes.com — P127C Chevrolet Code - Fuel Rail Pressure Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P127C Chevrolet?

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 Chevrolet?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P127C Chevrolet 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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Information for Specific Chevrolet Models

P127C 2014 Chevrolet Silverado — Fuel Rail Pressure Sensor 2 Circuit Low Voltage
P127C 2015 Chevrolet Silverado — Fuel Rail Pressure Sensor 2 Circuit Low Voltage
P127C 2016 Chevrolet Silverado — Fuel Rail Pressure Sensor 2 Circuit Low Voltage
P127C 2017 Chevrolet Silverado — Fuel Rail Pressure Sensor 2 Circuit Low Voltage
P127C 2018 Chevrolet Silverado — Fuel Rail Pressure Sensor 2 Circuit Low Voltage

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P127C Chevrolet Code

1. What are the common symptoms of OBDII code P127C in a Chevrolet related to the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

The common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and in some cases, the Check Engine Light may illuminate.

2. What are the potential causes of OBDII code P127C in a Chevrolet indicating an issue with the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

Possible causes include a malfunctioning fuel rail pressure sensor, damaged wiring or connectors in the sensor circuit, low fuel pressure, or a problem with the engine control module (ECM).

3. How can I diagnose the issue related to OBDII code P127C in my Chevrolet concerning the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

Diagnosis involves using a scan tool to read the code, checking the sensor's wiring and connectors for damage, testing the fuel pressure, and inspecting the sensor for proper operation.

4. Are there any specific repair tips for resolving OBDII code P127C in a Chevrolet due to Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

Ensure the fuel rail pressure sensor is functioning correctly, repair any damaged wiring or connectors, address any fuel pressure issues, and consider reprogramming or replacing the engine control module if necessary.

5. Can I drive my Chevrolet with OBDII code P127C related to the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

It is not recommended to drive the vehicle with this issue as it can lead to further engine damage and potential safety hazards. It is best to address the problem promptly.

6. How much does it typically cost to repair OBDII code P127C in a Chevrolet caused by the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500, including parts and labor.

7. Is it possible to reset OBDII code P127C in a Chevrolet related to the Fuel Rail Pressure Sensor 2 Circuit Low Voltage without repairing the underlying issue?

Resetting the code without fixing the problem will only temporarily remove the Check Engine Light. The issue will persist, and the code will likely return until the root cause is addressed.

8. Can a DIY enthusiast repair OBDII code P127C in a Chevrolet due to the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

While some basic diagnostic steps can be performed by DIY enthusiasts, repairing this code often requires specialized tools and expertise. It is recommended to seek professional help for a thorough diagnosis and repair.

9. What are the long-term consequences of ignoring OBDII code P127C in a Chevrolet related to the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

Ignoring this code can lead to decreased fuel efficiency, engine misfires, potential damage to engine components, and even complete engine failure in severe cases. Addressing the issue promptly is crucial.

10. How common is OBDII code P127C in Chevrolet vehicles indicating an issue with the Fuel Rail Pressure Sensor 2 Circuit Low Voltage?

While not as common as some other OBDII codes, P127C can still occur in Chevrolet vehicles, especially in older models or those with high mileage. Regular maintenance and prompt attention to warning signs can help prevent this issue.