AutoCodes – Chevrolet – P128D 2017 Chevrolet Silverado

P128D 2017 Chevrolet Silverado Code - Fuel Rail Temperature Sensor 2 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 2, Fuel Rail Temperature Sensor 2 harness is open or shorted, Fuel Rail Temperature Sensor 2 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: P128D 2017 Chevrolet Silverado indicates Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Fuel Rail Temperature Sensor 2, Fuel Rail Temperature Sensor 2 harness is open or shorted, Fuel Rail Temperature Sensor 2 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 527

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 P128D 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 P128D 2017 Chevrolet Silverado - Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect - AutoCodes.com — P128D 2017 Chevrolet Silverado Code - Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P128D 2017 Chevrolet Silverado?

Faulty Fuel Rail Temperature Sensor 2
Fuel Rail Temperature Sensor 2 harness is open or shorted
Fuel Rail Temperature Sensor 2 circuit poor electrical connection

How to Fix the DTC P128D 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 P128D 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 P128D 2017 Chevrolet Silverado code?

Need more information on how to fix the P128D 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P128D 2017 Chevrolet Silverado Code

1. What does the OBDII code P128D mean on a 2017 Chevrolet Silverado?

P128D indicates an issue with the Fuel Rail Temperature Sensor 2, where its signal message counter is incorrect or not matching expected values as interpreted by the engine control module (ECM).

2. What are the common symptoms of code P128D in a 2017 Chevrolet Silverado?

Symptoms may include a check engine light, reduced engine performance, poor fuel efficiency, or difficulty starting the vehicle.

3. What causes the P128D code to appear?

Common causes include a faulty fuel rail temperature sensor 2, damaged wiring or connectors, ECM software issues, or electrical interference affecting the sensor's signal.

4. Can I drive my 2017 Chevrolet Silverado with a P128D code?

While the vehicle may still be drivable, it is not recommended as this issue can lead to reduced performance, potential damage to fuel-related components, and inaccurate fuel system monitoring.

5. How do I diagnose the P128D code?

Diagnosis typically involves using a scan tool to read live data, inspecting the fuel rail temperature sensor 2 and its wiring for damage or corrosion, and testing the sensorâ€™s resistance and signal output.

6. How do I fix the P128D code on a 2017 Chevrolet Silverado?

Repairs may include replacing the fuel rail temperature sensor 2, repairing or replacing damaged wiring or connectors, or updating the ECM software if required.

7. How much does it cost to fix a P128D code?

Repair costs vary depending on the issue but typically range from $150 to $300 for sensor replacement, including parts and labor. Wiring repairs or ECM updates may cost more.

8. Can a bad fuel rail temperature sensor cause other problems?

Yes, a faulty sensor can affect fuel delivery, engine performance, and emissions, potentially leading to additional codes or engine issues.

9. What tools are needed to troubleshoot a P128D code?

Youâ€™ll need an OBDII scanner, a multimeter for testing electrical connections, and possibly a service manual for the specific wiring diagram of your Silverado.

10. Can a software update fix the P128D code on a 2017 Chevrolet Silverado?

In some cases, a software update for the ECM may resolve the issue if the problem is related to incorrect signal interpretation. Consult your dealership or mechanic for confirmation.