AutoCodes – Chevrolet – P128C Chevrolet

P128C Chevrolet 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 Chevrolet 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 5,540
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Sep 26, 2022
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Code P128C 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 P128C Chevrolet - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect - AutoCodes.com
P128C Chevrolet Code - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect

What are the Possible Causes of the DTC P128C Chevrolet?

  • 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 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 P128C 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 P128C Chevrolet code?

Need more information on how to fix the P128C Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P128C Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

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 P128C Chevrolet Code

1. What are the common symptoms of OBDII code P128C in a Chevrolet related to the Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect?

The common symptoms may include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What could cause the OBDII code P128C in a Chevrolet to trigger?

The code P128C typically triggers when the Fuel Rail Temperature Sensor 1 Signal Message Counter is reporting values that are outside the expected range, indicating a malfunction or issue with the sensor.

3. How serious is the OBDII code P128C in a Chevrolet?

While the code P128C may not cause immediate harm to the vehicle, it is still important to address the issue promptly to prevent potential long-term damage to the engine or fuel system.

4. What are some possible repair tips for fixing the OBDII code P128C in a Chevrolet?

Common repair tips may include checking the wiring and connections related to the Fuel Rail Temperature Sensor, replacing the sensor if faulty, and clearing the code to see if it reoccurs.

5. Can I continue to drive my Chevrolet with the OBDII code P128C present?

It is generally not recommended to drive the vehicle with an active OBDII code, as it can lead to further complications and potentially worsen the underlying issue causing the code.

6. How can I diagnose the OBDII code P128C related to the Fuel Rail Temperature Sensor in my Chevrolet?

Diagnosing the code may involve using an OBDII scanner to read the code, inspecting the sensor and its connections, and conducting tests to determine if the sensor is functioning correctly.

7. Are there any DIY fixes for the OBDII code P128C in a Chevrolet?

While some basic checks like inspecting the sensor connections can be done by DIY enthusiasts, diagnosing and repairing the exact cause of the code may require professional expertise and specialized tools.

8. What other components or systems should I inspect when troubleshooting the OBDII code P128C in a Chevrolet?

It is advisable to also check the fuel system components, wiring harnesses, and the engine control module (ECM) for any related issues that could be contributing to the code P128C.

9. How much does it typically cost to repair the OBDII code P128C in a Chevrolet at a professional auto repair shop?

The cost of repairing the code P128C can vary depending on the exact cause of the issue, but it may involve expenses for parts, labor, and diagnostic services.

10. Can the OBDII code P128C in a Chevrolet occur intermittently?

Yes, the code P128C may sometimes appear intermittently, especially if the issue with the Fuel Rail Temperature Sensor is sporadic or affected by specific driving conditions.

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