If you have a Honda Accord and get a Check Fuel Cap message, there are several causes, with some more common than others.
This problem is usually a gas cap that is not tightened all the way on but can be other issues.
Once the problem is fixed, the car will need to be driven for a while before the message disappears.
What Causes a Check Fuel Cap Message on a Honda Accord?
All modern vesicles have an Evaporative Emission Control System (EVAP), which prevents gas vapors from venting into the atmosphere.
This helps to reduce smog-related emissions.
The system works by setting a vacuum in the gas tank, which the onboard computer (ECM) monitors through a sensor.
When a vacuum is lost, the sensor will detect this as an evap leak, and the ECM will give the message Check Fuel Cap.
After the evap leak is sealed, the car will need to be driven to build the vacuum back up and the error to clear.
An OBDII scan tool can read codes which often include P0440, P0443, P0442, and P0449.
3 Common Fixes for Check Fuel Cap Message Honda Accord
- Be Sure the Gas Cap is Screwed all the Way In
- Replace the Gas Cap
- Purge Valve
You likely have already tried to screw the gas cap in better, but it is one of the most common problems.
A cap that is not all the way in will lose the seal, causing issues.
When turning it in, it should click a few times, which lets you know it is in all the way.
Also, check for any debris that may be causing the cap to not make a good seal.
The gas cap may be bad, especially if it is old and may need a replacement.
There is a rubber seal inside that rings the cap and makes a seal when screwed into place.
Examine the rubber seal to see if it is broken or old.
Often the cap can be replaced to rule it out a possible problem.
When a new cap is ordered, be sure to get the right one for your make and model.
Gas caps can be bought at auto parts stores or ode online on Amazon or eBay.
Be wary of non-genuine Honda gas caps, which sometimes do not work.
The non-genuine gas caps sometimes work and cost less but can cause issues since they may not seat properly.
Genuine Honda caps are best to buy to rule out the cap as a possible problem.
Example Honda Gas Cap on Amazon
Honda Genuine 17670-TR0-A11 Fuel Filler Cap Assembly
A purge valve is a solenoid that is part of the evap system.
When a car is off, the purge valve closes, stopping any vapors from escaping.
When a vehicle is running, the purge valve opens and allows vapors to go to the charcoal canister and burn in the engine.
Common problems with the valve include sticking and not closing.
The purge valve is usually located on the engine.
Replacing a purge valve is done by many backyard mechanics but if in doubt, be sure to take it to a mechanic.
Can I Drive with a Check Fuel Cap Message Honda Accord?
Usually, yes, you will be able to drive the car as most Evap leaks only affect the vehicle’s emissions.
In some rare cases, it may cause the vehicle to run poorly, which will make it undrivable.
If the car runs badly, there are likely more problems than a normal Evap Leak and will need to be looked at by a mechanic.