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 system that checks for leaks in the gas tank and the lines that carry gas vapors. It's like having a nose that can't smell a leak.
The P2406 code indicates that the voltage signal from the leak detection pump circuit is higher than expected, suggesting a malfunction in the EVAP system's ability to detect leaks.
The EVAP (Evaporative Emission Control) system prevents fuel vapors from escaping into the atmosphere. The leak detection pump is part of this system, and it helps ensure that the system is sealed properly. The 'sense circuit high' means the voltage is higher than normal, which can indicate a wiring issue, a faulty pump, or a malfunctioning sensor.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty leak detection pump
• Wiring issues or poor electrical connections
• Defective EVAP system pressure sensor
EVAP: Evaporative Emission Control System
OBD-II: On-Board Diagnostics, second generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the leak detection pump for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the leak detection pump if faulty.
• Replace the EVAP pressure sensor if defective.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect EVAP system components.
• Ensure gas cap is properly sealed.
• Perform routine vehicle maintenance.
Sensor Issue
• Don't ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid overfilling the gas tank.
Check if EVAP system components are covered under emissions warranty.
This code has been associated with faulty leak detection pumps in certain vehicle models.
Moderate – Addressing this code is important to prevent emissions issues and potential fuel vapor leaks.
Ignoring this code may lead to increased emissions and potential environmental harm.
• Vehicle at operating temperature
• Gas cap securely tightened
The leak detection pump is typically located near the fuel tank or in the rear of the vehicle.
Q: Can I drive with a P2406 code?
A: Yes, but it's best to address the issue soon to avoid increased emissions.
Q: Will a P2406 code affect my gas mileage?
A: It might not directly affect mileage, but unresolved issues can lead to other problems.
High-End · Full-system diagnostics
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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.