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 found a problem with the part that checks if gas vapors are leaking from the fuel system. It's like the car's nose can't smell leaks anymore.
The EVAP system is designed to capture fuel vapors from the fuel tank and prevent them from escaping into the atmosphere. The leak detection pump is part of this system and helps check for leaks. This code indicates an issue with the electrical circuit that senses the pump's operation.
The P2403 code is triggered when the Engine Control Module (ECM) detects an open or malfunction in the circuit that senses the operation of the EVAP system's leak detection pump. This can be due to a wiring issue, a faulty pump, or a problem with the ECM itself.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty leak detection pump
• Damaged or corroded wiring or connectors
• 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.
• Replace or repair damaged wiring or connectors.
• Replace the leak detection pump if faulty.
• Reset the ECM and test drive the vehicle.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain the EVAP system.
• Ensure fuel cap is properly tightened.
• Avoid overfilling the fuel tank.
Sensor Issue
• Get the issue diagnosed and repaired promptly to avoid emissions problems.
• Check for loose or damaged fuel caps.
• Consider a professional inspection if unsure.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with issues in vehicles with complex EVAP systems, particularly those with advanced emissions controls.
Moderate – While it may not affect immediate drivability, it can lead to emissions test failures and should be addressed soon.
Driving with an emissions-related fault can lead to failing emissions tests and may be illegal in some areas.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The leak detection pump is usually located near the fuel tank or in the rear of the vehicle.
Q: Can I drive with a P2403 code?
A: Yes, but it's best to get it fixed soon to avoid emissions issues.
Q: Will a P2403 code affect my fuel economy?
A: It might not directly affect fuel economy, but it can lead to other issues if not addressed.
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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.