AutoCodes – Buick – P128C Buick

P128C Buick 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 Buick 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 1,287

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 Buick 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 Buick - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect - AutoCodes.com — P128C Buick Code - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P128C Buick?

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 Buick?

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 Buick 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 Buick code?

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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 P128C Buick Code

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

- Common symptoms may include poor engine performance, reduced fuel efficiency, and in some cases, the illumination of the check engine light.

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

- The code P128C in a Buick is typically triggered by a faulty fuel rail temperature sensor, issues with the sensor wiring or connections, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P128C in my Buick?

- Diagnosing the issue may involve using an OBDII scanner to read the code, checking the fuel rail temperature sensor for proper function, inspecting the sensor wiring and connections, and testing the engine control module.

4. Can I continue driving my Buick with OBDII code P128C present?

- It is not recommended to continue driving your Buick with the code P128C present, as it can lead to further engine issues and potential damage. It is best to address the problem promptly.

5. What are some possible repair tips for fixing OBDII code P128C in a Buick?

- Repair tips may include replacing the faulty fuel rail temperature sensor, repairing any damaged wiring or connections, resetting the engine control module, and clearing the trouble code.

6. Is it possible to reset OBDII code P128C in a Buick without fixing the underlying issue?

- While you can clear the trouble code using an OBDII scanner, it is essential to address the root cause of the problem to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code P128C in a Buick?

- The cost of repairing OBDII code P128C in a Buick can vary depending on the exact cause of the issue, but it may involve expenses for parts and labor.

8. Can a DIY enthusiast fix OBDII code P128C in a Buick?

- Depending on the skill level and experience of the individual, some DIY enthusiasts may be able to tackle the repair for OBDII code P128C by following repair guides and using the necessary tools.

9. Are there any preventive maintenance steps to avoid OBDII code P128C in a Buick?

- Regular vehicle maintenance, including checking and replacing sensors as needed, inspecting wiring for damage, and keeping the engine control module in good condition, can help prevent OBDII code P128C from occurring.

10. Is OBDII code P128C specific to Buick vehicles, or can it occur in other car brands?

- While OBDII code P128C is associated with Buick vehicles, similar issues related to the fuel rail temperature sensor signal message counter may arise in other car brands as well.