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 to catch gas fumes before they escape into the air. This code means a part of that system isn't closing like it should, so the fumes might be getting out.
The EVAP system prevents fuel vapors from escaping into the atmosphere. The shutoff valve is supposed to close to keep these vapors contained. If it's stuck open, the system can't do its job.
The P149D code indicates that the Engine Control Module (ECM) has detected that the EVAP system shutoff valve is not closing properly. This can lead to an increase in hydrocarbon emissions as fuel vapors are not being contained within the system.
• Check Engine Light is on
• Increased fuel odor
• Possible decrease in fuel efficiency
• Faulty EVAP shutoff valve
• Electrical issue in the valve circuit
• Blockage or debris preventing valve closure
EVAP: Evaporative Emission Control System
ECM: Engine Control Module
• Scan for codes and verify the P149D is present.
• Inspect the EVAP shutoff valve for damage or blockage.
• Test the electrical circuit for proper voltage and ground.
• Replace the EVAP shutoff valve if faulty.
• Repair or replace damaged wiring or connectors.
• Clear any blockages in the valve.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Regular maintenance checks
• Keep fuel system components clean
• Address Check Engine Light issues promptly
Emission Control System Issue
• Do not ignore the Check Engine Light.
• Have your vehicle inspected by a professional if you notice fuel odors.
• Regularly service your vehicle to prevent such issues.
Check with your vehicle manufacturer for emissions-related warranty coverage.
The P149D code has become more common as emission standards have tightened, requiring more complex EVAP systems.
Moderate – While it may not affect immediate drivability, it can lead to increased emissions and potential inspection failures.
Driving with this code may result in failing emissions tests and contribute to environmental pollution.
• Engine at operating temperature
• Vehicle on level ground
The EVAP shutoff valve is typically located near the fuel tank or in the engine bay, depending on the vehicle model.
Q: Can I drive my car with a P149D code?
A: Yes, but it is not recommended to drive for extended periods as it may lead to increased emissions and potential damage to the EVAP system.
Q: Will a P149D code affect my car's performance?
A: It may not directly affect performance, but you might notice increased fuel odors or a slight decrease in fuel efficiency.
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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.