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 checks for leaks in the fuel tank and pipes. This code means there's a problem with the part that controls the pump checking for leaks.
The P24BF code indicates that the control circuit for the EVAP system's leak detection pump switching valve is experiencing a high voltage condition.
The EVAP (Evaporative Emission Control) system prevents fuel vapors from escaping into the atmosphere. The leak detection pump is a part of this system and helps to ensure that there are no leaks. The switching valve controls this pump, and the 'control circuit high' condition means there is an abnormal high voltage detected in the circuit, which could be due to wiring issues, a faulty valve, or other electrical problems.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty leak detection pump switching valve
• Wiring issues such as short circuits
• Faulty control module
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 or corrosion.
• Test the leak detection pump switching valve for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the leak detection pump switching valve if faulty.
• Clear the code and test drive to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Volkswagen Jetta
• Audi A4
• BMW 3 Series
• Regularly inspect and maintain the EVAP system.
• Ensure all fuel caps are tightly secured.
• Perform routine diagnostic checks.
Sensor Issue
• Address the issue promptly to avoid further complications.
• Consult a professional mechanic if unsure about repairs.
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 in models with advanced emission controls.
Moderate – It should be addressed soon to avoid potential emissions problems.
Driving with a malfunctioning EVAP system may lead to increased emissions, which can be illegal in some areas.
• Engine at operating temperature
• Vehicle in a safe, ventilated area
The leak detection pump and switching valve are typically located near the fuel tank or within the EVAP canister assembly.
Q: Can I drive with a P24BF code?
A: You can drive for short distances, but it's best to fix the issue soon to avoid emissions problems.
Q: Will a P24BF code cause my car to fail an emissions test?
A: Yes, a malfunctioning EVAP system can cause your vehicle to fail an emissions test.
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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.