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 keeps gas fumes from escaping into the air. This code means there's a problem with the part that lets air into this system, like a switch isn't working right.
The P0498 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the evaporative emission (EVAP) system vent valve control circuit.
The EVAP system is responsible for capturing fuel vapors from the fuel tank and preventing them from escaping into the atmosphere. The vent valve allows fresh air to enter the system to help purge the vapors. A 'circuit low' condition means that the PCM is detecting a lower than expected voltage in the control circuit for the vent valve, which could be due to a short circuit, faulty wiring, or a malfunctioning vent valve.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty EVAP vent valve
• Short circuit in the wiring
• Faulty PCM
EVAP: Evaporative Emission Control System
PCM: Powertrain Control Module
• Scan the vehicle for codes and freeze frame data.
• Inspect the EVAP vent valve and wiring for damage.
• Test the voltage and ground at the vent valve connector.
• Replace the EVAP vent valve if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Silverado
• Ford F-150
• Toyota Camry
• Regularly inspect EVAP system components.
• Keep wiring and connectors clean and secure.
• Perform routine maintenance checks.
Sensor Issue
• Have your vehicle inspected by a professional.
• Avoid overfilling the fuel tank.
• Regularly check for fuel odors.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
The P0498 code has been a common issue in vehicles with aging EVAP systems, especially in models over 10 years old.
Moderate – While not immediately critical, it should be addressed to prevent emissions issues and potential fuel vapor leaks.
Ignoring emissions-related issues can lead to increased pollution and may result in failing emissions tests required by law.
• Vehicle at operating temperature
• EVAP system purge and seal tests active
The EVAP vent valve is typically located near the fuel tank or along the EVAP canister line.
Q: Can I drive with a P0498 code?
A: Yes, but it's recommended to fix it soon to avoid emissions problems.
Q: Will a P0498 code affect my fuel economy?
A: Not directly, but unresolved issues might lead to other problems that could.
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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.