AutoCodes – Chevrolet – P128F Chevrolet

P128F Chevrolet Code - Fuel Rail Pressure Sensors 1 and 2 Signals 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 Pressure Sensor, Fuel Rail Pressure Sensor harness is open or shorted, Fuel Rail Pressure Sensor 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: P128F Chevrolet indicates Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect.
Common causes: Common causes include Faulty Fuel Rail Pressure Sensor, Fuel Rail Pressure Sensor harness is open or shorted, Fuel Rail Pressure Sensor 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.

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Code Popularity 8,893

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P128F Chevrolet Description

The fuel rail pressure sensor transmits fuel pressure and temperature information by serial data. The fuel rail pressure sensor internal microprocessor allows 4 separate sensor outputs from one 3 wire sensor. The Engine Control Module (ECM) supplies the fuel rail pressure sensor with a 5 V reference circuit, a low reference circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the fuel rail pressure sensor to the ECM. The ECM decodes the serial data signal into separate voltages which are displayed on a scan tool as the voltage inputs from the Fuel Temperature Sensor, Fuel Rail Pressure Sensor and Fuel Rail Pressure Sensor 2.

OBDII Code P128F Chevrolet - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect - AutoCodes.com — P128F Chevrolet Code - Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P128F Chevrolet?

Faulty Fuel Rail Pressure Sensor
Fuel Rail Pressure Sensor harness is open or shorted
Fuel Rail Pressure Sensor circuit poor electrical connection

How to Fix the DTC P128F 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P128F 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.

Need more information about the P128F Chevrolet code?

Need more information on how to fix the P128F Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P128F Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P128F 2014 Chevrolet Silverado — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
P128F 2015 Chevrolet Silverado — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
P128F 2016 Chevrolet Silverado — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
P128F 2017 Chevrolet Silverado — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect
P128F 2018 Chevrolet Silverado — Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect

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 P128F Chevrolet Code

1. What does OBDII code P128F Chevrolet mean?

The P128F code indicates that the Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect on a Chevrolet vehicle.

2. What are the common symptoms of code P128F?

Common symptoms include rough idling, poor engine performance, a decrease in fuel efficiency, and the illumination of the Check Engine Light.

3. What are the possible causes of code P128F?

Possible causes of the P128F code include faulty fuel rail pressure sensors, wiring issues in the fuel rail pressure sensor circuit, or a problem with the Engine Control Module (ECM).

4. How can I diagnose the P128F code?

Diagnosing the P128F code involves using an OBDII scanner to retrieve the specific fault code and then performing a visual inspection of the fuel rail pressure sensor wiring and connections.

5. Can I still drive my vehicle with the P128F code?

It is not recommended to drive your vehicle with the P128F code present, as it can lead to further engine damage and decreased performance.

6. How can I repair the P128F code?

Repairing the P128F code may involve replacing the faulty fuel rail pressure sensors, repairing any damaged wiring, or resetting the ECM to clear the code.

7. Do I need special tools to fix the P128F code?

While basic tools may be sufficient for some repairs related to the P128F code, it is recommended to have an OBDII scanner and possibly a multimeter for more advanced diagnostics.

8. Will resetting the ECM clear the P128F code?

Resetting the ECM may temporarily clear the P128F code, but if the underlying issue is not addressed, the code is likely to reappear.

9. Can a DIY enthusiast fix the P128F code?

Depending on the level of expertise, a DIY enthusiast may be able to diagnose and repair the P128F code, but complex issues may require professional assistance.

10. How long does it typically take to repair the P128F code?

The time required to repair the P128F code can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to complete the repair.