Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble sending power to the fuel pump, which helps the car get gas to the engine.
The P0628 code indicates that the power supply to the fuel pump is lower than expected, which can prevent the pump from functioning properly.
The P0628 code is triggered when the Engine Control Module (ECM) detects a low voltage condition in the fuel pump control circuit. This can be due to issues in the wiring, connectors, or the fuel pump relay itself. The fuel pump is responsible for delivering fuel from the tank to the engine, and a low voltage can lead to insufficient fuel delivery and engine performance issues.
• Engine may not start
• Engine stalls
• Poor engine performance
• Check Engine Light illuminated
• Faulty fuel pump relay
• Wiring issues in the fuel pump circuit
• Bad fuel pump
• Corroded or loose electrical connections
• Faulty ECM
ECM: Engine Control Module, the computer that controls engine functions.
Relay: An electrical switch that opens and closes under control of another electrical circuit.
• Check for any other related trouble codes
• Inspect the fuel pump relay and fuse
• Examine the wiring and connectors in the fuel pump circuit
• Test the fuel pump for proper operation
• Check the ECM for faults
• Replace the faulty fuel pump relay
• Repair or replace damaged wiring or connectors
• Replace the fuel pump if necessary
• Ensure all electrical connections are clean and secure
• Replace or reprogram the ECM if needed
• Multimeter
• OBD-II scanner
• Basic hand tools (screwdrivers, wrenches)
• Fuel pressure gauge
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain electrical connections
• Replace fuel filters as recommended
• Keep the fuel tank at least a quarter full to avoid overheating the pump
Engine Performance
• Do not ignore the Check Engine Light
• Have the vehicle inspected by a professional if unsure
• Regular maintenance can prevent such issues
Check with the vehicle manufacturer for warranty coverage on fuel system components.
This code has been commonly reported in vehicles with high mileage or poor maintenance records.
High – This issue can lead to engine stalling or failure to start, which can be dangerous.
Driving with a malfunctioning fuel pump can lead to stalling and increased risk of accidents. Address the issue promptly.
• Vehicle in idle
• Engine running
The fuel pump is typically located inside the fuel tank, and the relay is usually found in the engine bay fuse box.
Q: Can I drive with a P0628 code?
A: It's not recommended to drive with this code as it can lead to engine stalling or failure to start.
Q: How do I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the code after repairs. If the issue is resolved, the light should stay off.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.