Skip the auto shop - Our mechanics make house calls

Q: Fuel cap indicator not working

asked by on

My vehicle is indicating that my fuel cap is not on, even though it is.

A: Hi. I assume your Check Engine Light is on ...

Hi. I assume your Check Engine Light is on and you have an evaporative emissions (EVAP) code stored. Your cap may not be sealing well, even if it is on and tight. I would start by replacing the cap first and clearing the diagnostic trouble code. If the light comes back on after, there is a leak somewhere else in the EVAP system. A trained technician can find this leak using a dedicated leak detector. This device puts smoke in the system to pinpoint the leak.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gas cap warning light stays on

I would take it back to the dealer that put the tank in and have them check their installation of the fuel tank. The lights should be off and no leaks detected with the new fuel tank. You may have...

Q: Electrics issue in a relatively new car

Most of the electrical systems in your car are controlled by a module that controls power to the components when you want power. When you leave your vehicle and lock your doors it will stay active for a short time,...

Q: Car starts but want drive?

Hi There, It sounds like you are describing the symptoms of a failing throttle position sensor. The throttle position sensor monitors the throttle position of the throttle plate inside the throttle body in relation to your foot position on the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.