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 has detected a problem with the electrical circuit that controls the fuel pump. It's like when a light switch is stuck in the 'on' position and the light won't turn off.
The P0629 code indicates that the voltage in the control circuit for Fuel Pump A is higher than expected.
The P0629 code is triggered when the Powertrain Control Module (PCM) detects a voltage level in the fuel pump control circuit that is higher than the specified range. This could be due to a short circuit, a faulty relay, or a problem with the fuel pump itself.
• Check Engine Light is on
• Engine may not start
• Poor fuel efficiency
• Engine stalling
• Faulty fuel pump relay
• Short circuit in the fuel pump wiring
• Defective fuel pump
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
Relay: An electrical switch that opens and closes under the control of another electrical circuit.
• Use an OBD-II scanner to confirm the code.
• Inspect the fuel pump relay and wiring for damage.
• Check the voltage at the fuel pump connector.
• Test the fuel pump for proper operation.
• Replace the faulty fuel pump relay.
• Repair or replace damaged wiring.
• Replace the defective fuel pump.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain fuel system components.
• Ensure proper electrical connections.
• Use quality fuel to avoid contamination.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid driving the vehicle if it stalls frequently.
Check with the vehicle manufacturer for warranty coverage on fuel system components.
The P0629 code has been associated with vehicles that have had fuel pump relay issues or wiring problems.
Moderate – While the vehicle may still operate, it could lead to more severe issues if not addressed promptly.
Driving with a faulty fuel pump circuit can lead to stalling and may pose a safety risk. Address the issue as soon as possible.
• Engine running
• Fuel pump circuit under load
The fuel pump is typically located in the fuel tank, while the relay is usually found in the engine compartment fuse box.
Q: Can I drive with a P0629 code?
A: It's not recommended to drive with this code as it can lead to engine stalling and other issues.
Q: How do I clear a P0629 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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.