Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a system that makes sure gas fumes don't escape into the air. This code means there's a problem with the part that checks for leaks in that system.
The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank and preventing them from escaping into the atmosphere. The leak detection pump is a component that tests the system for leaks. This code indicates that the control circuit for the pump is reading a low voltage, which means there might be an electrical issue.
The P2401 code is triggered when the Engine Control Module (ECM) detects a low voltage condition in the EVAP system leak detection pump control circuit. This can be caused by a faulty pump, wiring issues, or a problem with the ECM itself.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty leak detection pump
• Wiring issues such as shorts or open circuits
• Faulty ECM
EVAP: Evaporative Emission Control System
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the leak detection pump for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the leak detection pump if faulty.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $500
Moderate
• Toyota Camry
• Ford Focus
• Honda Accord
• Regularly inspect EVAP system components.
• Ensure gas cap is properly sealed.
• Keep the vehicle's electrical system in good condition.
Sensor Issue
• Have the vehicle inspected by a qualified mechanic.
• Avoid overfilling the fuel tank.
Check with your vehicle's manufacturer for emissions-related warranty coverage.
This code has been more commonly reported in vehicles with higher mileage or those frequently driven in harsh conditions.
Moderate – While not immediately dangerous, it should be addressed to prevent emissions issues.
Driving with an active Check Engine Light may cause the vehicle to fail emissions testing.
• Vehicle must be in a safe, flat area.
• Ensure the engine is cool before inspection.
The leak detection pump is usually located near the fuel tank or in the rear of the vehicle.
Q: Can I drive with a P2401 code?
A: Yes, but it's best to fix it soon to avoid emissions issues.
Q: Will a P2401 code affect my fuel economy?
A: It may slightly affect fuel economy due to potential fuel vapor loss.
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Network faults often require full-system access instead of a generic code reader alone.
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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.
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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.
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Fitment Required · Vehicle-fitment part
Relevant when EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.