P0628 2018 GMC Sierra Code - Fuel Pump Speed Output Circuit Low Voltage
Quick Answer
The P0628 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the fuel pump speed output circuit registering low voltage. Common causes include Faulty fuel pump speed sensor, Damaged wiring or connectors in the fuel pump speed output circuit, Malfunctioning fuel pump control module. 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 2018 GMC Sierra indicates Fuel Pump Speed Output Circuit Low Voltage.
- Common causes
- Common causes include Faulty fuel pump speed sensor, Damaged wiring or connectors in the fuel pump speed output circuit, Malfunctioning fuel pump control module.
- 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 P0628 2018 GMC Sierra Description
The P0628 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the fuel pump speed output circuit registering low voltage. The fuel pump speed output circuit is responsible for monitoring and controlling the speed of the fuel pump, which is crucial for delivering the correct amount of fuel to the engine. When the voltage in this circuit drops below the specified range, it can lead to various issues with the vehicle's performance.
Common Causes of P0628 2018 GMC Sierra
- Faulty fuel pump speed sensor
- Damaged wiring or connectors in the fuel pump speed output circuit
- Malfunctioning fuel pump control module
- Issues with the power supply to the fuel pump
- Corrosion or debris affecting the fuel pump components
Symptoms of P0628 2018 GMC Sierra
- Check engine light illuminated on the dashboard
- Engine misfires or hesitation during acceleration
- Reduced fuel efficiency
- Engine stalling or difficulty starting
- Rough idling or uneven engine performance
How to Fix P0628 2018 GMC Sierra
- Begin by conducting a thorough inspection of the fuel pump speed output circuit, including the sensor, wiring, connectors, and control module.
- Test the fuel pump speed sensor and replace it if found to be faulty.
- Check for any damaged wiring or connectors in the circuit and repair or replace them as needed.
- Inspect the fuel pump control module for any malfunctions and replace it if necessary.
- Clear the DTC and reset the check engine light to ensure the issue has been resolved.
Cost to Fix P0628 2018 GMC Sierra
The typical repair costs for addressing a P0628 code on a 2018 GMC Sierra can range from $200 to $500, including parts and labor. However, it's important to note that 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. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It's recommended to check local rates for a more accurate estimate.
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Frequently Asked Questions about P0628 2018 GMC Sierra Code
1. What does the OBDII code P0628 mean on a 2018 GMC Sierra?
P0628 indicates a problem with the fuel pump speed output circuit, specifically low voltage, which can affect the fuel pump's operation.
2. What are the common symptoms of P0628 on a 2018 GMC Sierra?
Symptoms include difficulty starting the engine, poor acceleration, engine misfires, reduced fuel efficiency, or the engine stalling.
3. What causes the P0628 code to appear on a 2018 GMC Sierra?
Common causes include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or a malfunctioning fuel control module.
4. Can I drive my 2018 GMC Sierra with the P0628 code?
Driving with this code is not recommended, as it can lead to stalling or further damage to the fuel system.
5. How do you diagnose the P0628 code on a 2018 GMC Sierra?
Diagnosis involves inspecting the fuel pump circuit wiring and connectors, checking the fuel pump relay and control module, and testing the fuel pump for proper operation.
6. How can I fix the P0628 code on my 2018 GMC Sierra?
Repairs may include replacing damaged wiring, connectors, or the fuel pump relay, or replacing the fuel pump or fuel control module if necessary.
7. What tools are needed to diagnose and repair the P0628 code on a 2018 GMC Sierra?
Tools include a diagnostic scanner, a multimeter for testing voltage, and basic hand tools for inspecting and replacing components.
8. How much does it cost to repair the P0628 code on a 2018 GMC Sierra?
Repair costs vary depending on the issue but typically range from $100 to $500, depending on whether you need to replace the fuel pump or other components.
9. Can a bad battery cause the P0628 code on a 2018 GMC Sierra?
Yes, a weak or failing battery can cause voltage issues that may trigger this code.
10. Does the P0628 code on a 2018 GMC Sierra require professional repair?
While some issues like checking wiring and connectors can be done by DIYers, complex repairs like replacing the fuel control module may require professional assistance.
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