P0628 2016 GMC Sierra Code - Fuel Pump Speed Output Circuit Low Voltage
Quick Answer
The P0628 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the fuel pump speed output circuit registering a low voltage. Common causes include Faulty fuel pump speed sensor, Wiring issues or loose connections in the fuel pump speed output circuit, Corrosion or damage to the fuel pump speed output 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 2016 GMC Sierra indicates Fuel Pump Speed Output Circuit Low Voltage.
- Common causes
- Common causes include Faulty fuel pump speed sensor, Wiring issues or loose connections in the fuel pump speed output circuit, Corrosion or damage to the fuel pump speed output 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.
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Code P0628 2016 GMC Sierra Description
The P0628 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the fuel pump speed output circuit registering a low voltage. The fuel pump speed output circuit is responsible for controlling the speed of the fuel pump, which is crucial for delivering the right amount of fuel to the engine. When the voltage in this circuit drops below the specified threshold, it can lead to various issues affecting the vehicle's performance.
Common Causes of P0628 2016 GMC Sierra
- Faulty fuel pump speed sensor
- Wiring issues or loose connections in the fuel pump speed output circuit
- Corrosion or damage to the fuel pump speed output circuit
- Issues with the fuel pump relay
- Faulty engine control module (ECM) or powertrain control module (PCM)
Symptoms of P0628 2016 GMC Sierra
- Engine misfires or hesitation during acceleration
- Rough idling or stalling
- Difficulty starting the vehicle
- Decreased fuel efficiency
- Check Engine Light illuminated on the dashboard
How to Fix P0628 2016 GMC Sierra
- Begin by conducting a thorough inspection of the fuel pump speed output circuit, checking for any loose connections, damaged wiring, or corrosion. Repair or replace any damaged components as needed.
- Test the fuel pump speed sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if it is faulty.
- Check the fuel pump relay for proper operation and replace it if necessary.
- If the issue persists, diagnose the ECM or PCM for any faults related to the fuel pump speed output circuit. Replace the module if it is determined to be the cause of the problem.
- Clear the DTC using a scan tool and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0628 2016 GMC Sierra
The typical repair costs for addressing a P0628 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a fuel pump speed sensor, fuel pump relay, or ECM/PCM can range from $50 to $300 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour. The total repair cost can therefore vary from $150 to $800 or more, depending on the extent of the repairs needed. It is advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on the specific circumstances of the vehicle.
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Frequently Asked Questions about P0628 2016 GMC Sierra Code
What does the OBD-II code P0628 mean on a 2016 GMC Sierra?
P0628 indicates that the Fuel Pump Speed Output Circuit is experiencing low voltage, meaning the control module has detected an issue with the fuel pump's electrical circuit or its operation.
What are common symptoms of the P0628 code on a 2016 GMC Sierra?
Symptoms may include difficulty starting the engine, reduced engine performance, stalling, poor fuel efficiency, or the Check Engine Light being illuminated.
What causes the P0628 code on a 2016 GMC Sierra?
Common causes include a faulty fuel pump relay, damaged or corroded wiring in the fuel pump circuit, a failing fuel pump, or a malfunctioning powertrain control module (PCM).
How is the P0628 code diagnosed on a 2016 GMC Sierra?
A mechanic will use a scan tool to verify the code, inspect the wiring and connections in the fuel pump circuit, test the fuel pump relay, and check the voltage and ground at the fuel pump.
Can I drive my 2016 GMC Sierra with the P0628 code?
While you may still be able to drive, it is not recommended. The P0628 code can lead to poor engine performance or stalling, which could leave you stranded or cause unsafe driving conditions.
How do you fix the P0628 code on a 2016 GMC Sierra?
Repairs may include replacing a faulty fuel pump relay, repairing or replacing damaged wiring or connectors, replacing the fuel pump, or reprogramming or replacing the PCM if necessary.
Can a weak battery cause the P0628 code on a 2016 GMC Sierra?
Yes, a weak or failing battery can sometimes cause voltage-related issues, including triggering the P0628 code. Always check the battery and charging system as part of the diagnostic process.
What tools are needed to troubleshoot the P0628 code on a 2016 GMC Sierra?
Common tools include a diagnostic scan tool, a multimeter to check voltage and continuity, and wiring diagrams to trace the fuel pump circuit.
Does the P0628 code always mean the fuel pump is bad on a 2016 GMC Sierra?
No, the issue can also stem from problems with the wiring, connectors, or the fuel pump relay. Proper diagnosis is essential to identify the exact cause.
How much does it cost to fix the P0628 code on a 2016 GMC Sierra?
Repair costs can vary depending on the issue. Replacing a fuel pump relay or repairing wiring may cost $100–$300, while replacing the fuel pump could range from $500 to $1,000 or more, including labor.
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