If you have a Honda Odyssey and a “Check Fuel Cap” message comes on, there are several causes and fixes.
The most common fix is to tighten the gas cap, but other things can also cause the issue.
A “Check Fuel Cap” message is common with Honda vehicles and is usually a DIY job.
Of course, if in doubt, be sure to take your Honda to a professional.
What is the Honda Odyssey “Check Fuel Cap” Error Message?
An EVAP system keeps the gas vapors in the gas tank and stops them from venting into the atmosphere.
If there is a leak in the EVAP system, the onboard computer will detect this and send out the message “Check Fuel Cap.”
While a loose gas cap is a common fix, any leak in the EVAP system can cause the error message to display.
Causes and Fixes Honda Odyssey “Check Fuel Cap” Message
- Gas Cap
- Purge Valve
- Vapor Canister
- Hose Leak
The cap may be on tight, but some debris is blocking it, or the seal may no longer be working properly.
Examine the gas inlet for anything that may block the gas cap from sealing.
If the gas cap looks damaged a new one can be bought at an auto part store or online.
Example OEM Honda Gas Cap on Amazon
Genuine Honda 17670-SM4-A04 Fuel Filler Cap
A bad purge valve can also cause an error message.
The purge valve opens when the engine is running to let the vapors burn off in the engine. It then closes when the engine is off.
If it gets stuck open or shut, it can cause an error and need to be replaced.
The wiring should also be checked as an open or short can cause the same issue as a bad purge valve.
Replacing a purge valve is not difficult for a DIY-type of person.
Example Honda Purge Valve on Amazon
Purge Control Solenoid Valve 36162-PNC-005 Replacement for Honda
The canister has hoses that often leak and seals that can fail also causing a leak.
Replacing the vapor canister can be difficult since it is under the vehicle and not easy to access.
Any leak in a hose will also cause a problem and will need to be fixed.
A professional mechanic shop will use a smoke machine to feed smoke into the EVAP system and look for the smoke exiting.
There are low-cost smoke machines for difficult to find leaks but examine the hoses and check for cracks that may be causing them to leak.
What Does “Check Fuel Cap” Mean on Honda Odyssey?
The “Check Fuel Cap” message in a Honda Odyssey usually means the gas cap is loose and needs to be tightened.
If the gas cap is on tight the EVAP system has a leak and will need to be troubleshot to find out the leak location.
While a gas cap issue is the most common problem, it can also be a failure in the EVAP system.
How Long Does it Take for Honda Odyssey “Check Fuel Cap” Message to Reset?
The message will usually clear once the car is driven for 5-10 miles.
The message should clear once the EVAP leak has been fixed and the car is driven.
Is it Safe to Drive with a “Check Fuel Cap” Message on a Honda Odyssey?
Yes, it is safe to drive with a “Check Fuel Cap” message.
The car will not pass an emissions test, but it will usually drive fine with no issues.
While the Honda Odyssey may not have any problems, it is recommended to get it fixed as soon as possible.
A Honda Odyssey with a “Check Fuel Cap” warning message is a common issue which means there is an EVAP leak.
The usual fix is the gas cap not tight but can also be a failed component in the EVAP system.
A mechanic shop would use a smoke machine to find any leaks and repair them.
Have you had an issue with a Honda Odyssey “Check Fuel Cap” message? Let us know your thoughts below.