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Engine-Codes – Buick – P0628 Buick

P0628 Buick Code - Fuel Pump Speed Output Circuit Low Voltage

Quick Answer

The P0628 Buick code indicates a problem with the fuel pump speed output circuit, specifically a low voltage issue. Common causes include Faulty fuel pump speed sensor, Fuel pump control module malfunction, Damaged wiring or connectors in the circuit. 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
P0628 Buick indicates Fuel Pump Speed Output Circuit Low Voltage.
Common causes
Common causes include Faulty fuel pump speed sensor, Fuel pump control module malfunction, Damaged wiring or connectors in the circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0628 Buick Description

The P0628 Buick code indicates a problem with the fuel pump speed output circuit, specifically a low voltage issue. The fuel pump speed output circuit is responsible for controlling the speed of the fuel pump, which is crucial for maintaining the proper fuel pressure in the fuel system. When the voltage in this circuit drops below the specified range, it can lead to various performance issues in the vehicle.

OBDII Code P0628 Buick - Fuel Pump Speed Output Circuit Low Voltage
P0628 Buick Code - Fuel Pump Speed Output Circuit Low Voltage

Common Causes of P0628 Buick

  1. Faulty fuel pump speed sensor
  2. Fuel pump control module malfunction
  3. Damaged wiring or connectors in the circuit
  4. Issues with the powertrain control module (PCM)

Symptoms of P0628 Buick

  1. Poor fuel efficiency
  2. Engine hesitation or stumbling
  3. Engine misfires
  4. Rough idling
  5. Difficulty starting the vehicle

How to Fix P0628 Buick

  1. Use a scan tool to retrieve the fault code and diagnose the specific cause of the issue.
  2. Inspect the wiring and connectors in the fuel pump speed output circuit for any damage or corrosion.
  3. Test the fuel pump speed sensor to determine if it is functioning correctly.
  4. Check the fuel pump control module for any signs of malfunction.
  5. Replace any faulty components identified during the diagnostic process and clear the fault code from the PCM.

Cost to Fix P0628 Buick

The typical repair costs for addressing a P0628 Buick code can range from $200 to $500, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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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 P0628 Buick Code

1. What are the common symptoms of OBDII code P0628 in a Buick related to the fuel pump speed output circuit low voltage?

The common symptoms include issues with starting the vehicle, engine stalling, poor fuel economy, and a decrease in overall engine performance.

2. What are the possible causes of the OBDII code P0628 in a Buick indicating low voltage in the fuel pump speed output circuit?

Possible causes include a faulty fuel pump control module, damaged wiring or connectors in the circuit, a weak or dead fuel pump, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the OBDII code P0628 in my Buick related to the fuel pump speed output circuit low voltage?

Diagnosis involves using a scan tool to retrieve the trouble code, checking the fuel pump control module for proper function, inspecting wiring and connectors for damage, testing the fuel pump speed sensor, and verifying the PCM operation.

4. Can I still drive my Buick with the OBDII code P0628 triggered?

It is not recommended to drive your Buick with the P0628 code active as it can lead to potential fuel delivery issues, engine stalling, and further damage to the fuel pump system.

5. How can I repair the OBDII code P0628 in my Buick indicating low voltage in the fuel pump speed output circuit?

Repair involves addressing the root cause of the issue, which may include replacing the fuel pump control module, repairing damaged wiring or connectors, replacing a faulty fuel pump, or reprogramming the PCM.

6. Is it possible to reset the OBDII code P0628 in a Buick without fixing the underlying issue?

While clearing the trouble code may temporarily turn off the check engine light, the code will likely reappear if the underlying problem causing the low voltage in the fuel pump speed output circuit is not resolved.

7. How urgent is it to address the OBDII code P0628 in my Buick related to the fuel pump speed output circuit low voltage?

It is important to address the P0628 code promptly to prevent potential fuel delivery issues, engine performance problems, and further damage to the fuel pump system.

8. Can a DIY enthusiast fix the OBDII code P0628 in a Buick themselves?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair the P0628 code by following proper troubleshooting steps and using the right replacement parts.

9. Are there any preventive measures to avoid encountering the OBDII code P0628 in a Buick?

Regular maintenance, such as inspecting the fuel pump system, checking for wiring issues, and ensuring proper fuel pump control module function, can help prevent the occurrence of the P0628 trouble code.

10. Are there any recalls or technical service bulletins related to the OBDII code P0628 in Buick vehicles?

It is advisable to check with your local Buick dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to the P0628 code in your specific Buick model.

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