P0628 Buick Code - Fuel Pump Speed Output Circuit Low Voltage
Quick Answer
The Engine Control Module (ECM) supplies voltage to the fuel pump driver control module for 30 s when the ignition is on and continuously when the engine is running. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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
- P0628 Buick indicates Fuel Pump Speed Output Circuit Low Voltage.
- Common causes
- Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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.
Code P0628 Buick Description
What are the Possible Causes of the DTC P0628 Buick?
- Faulty Fuel Pump Driver Control Module
- Fuel Pump Driver Control Module harness is open or shorted
- Fuel Pump Driver Control Module circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0628 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 P0628 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.
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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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