AutoCodes – Chevrolet – P128C 2017 Chevrolet Silverado

P128C 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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.

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Code Popularity 325

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 26, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P128C 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect - AutoCodes.com — P128C 2017 Chevrolet Silverado Code - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P128C 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P128C 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P128C 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2017 Chevrolet Silverado Code

1. What does the OBDII code P128C mean on a 2017 Chevrolet Silverado?

P128C indicates that the Fuel Rail Temperature Sensor 1 is sending an incorrect signal message counter to the engine control module (ECM).

2. What are the common symptoms of code P128C in a 2017 Chevrolet Silverado?

Symptoms may include reduced engine performance, poor fuel economy, difficulty starting the vehicle, or an illuminated check engine light.

3. What causes the P128C code to appear on a 2017 Chevrolet Silverado?

Common causes include a faulty fuel rail temperature sensor, wiring issues such as damaged or corroded connections, or a malfunctioning ECM.

4. Can I drive my 2017 Chevrolet Silverado with the P128C code active?

While the truck may still run, driving with this code active can lead to poor performance or potential engine damage. Itâ€™s best to address the issue promptly.

5. How do I fix the P128C code on my 2017 Chevrolet Silverado?

Repairs typically involve inspecting and replacing the fuel rail temperature sensor, repairing damaged wiring or connectors, or reprogramming the ECM if necessary.

6. How do I test the fuel rail temperature sensor for the P128C code?

You can test the sensor using a multimeter to check for proper voltage or resistance values as specified in the service manual.

7. Could a software issue cause the P128C code on a 2017 Chevrolet Silverado?

Yes, outdated or corrupted ECM software can cause communication errors, which may trigger the P128C code.

8. How much does it cost to repair the P128C code on a 2017 Chevrolet Silverado?

Repair costs vary, but replacing the fuel rail temperature sensor typically costs between $100 and $300, including parts and labor.

9. Will clearing the P128C code with a scan tool fix the issue?

Clearing the code may temporarily turn off the check engine light, but the issue will return if the root cause isnâ€™t resolved.

10. Can a dirty fuel system trigger the P128C code on a 2017 Chevrolet Silverado?

While unlikely, a contaminated fuel system could indirectly affect sensor readings. However, the primary cause is typically a sensor or communication issue.