Q: Left cap off-check engine light won't go off

asked by on

I have a 2008 Hyuandai Elantra. My niece drove my car. She filled it up with gas. I was driving the car and the check engine light came on. I checked the gas cap first thing, and she had forgot to screw it back on. It's been 24 hours since I screwed it on and I have driven it forty miles and it still has not went off. I took the car to the local auto zone and the code they gave me indicated the same issue. Will it go off automatically, or will I have to take it to the dealership? Thanks in advance!!

My car has 104000 miles.
My car has an automatic transmission.

A: Hey there. After a few ignition cycles - st...

Hey there. After a few ignition cycles - started, driven, and shut down - the code should erase itself if the ECU no longer sees the loose gas cap as a continuing fault. There shouldn't be any drivability problems if this was the only code. If the light still persists after a few drives, I would have the codes diagnosed more thoroughly and the data read with a scanner to see what needs to be done to clear the code.

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・Save up to 30%

Get a quote

What others are asking

Q: Car shuts down when gas is pushed

Situations like the one you are experiencing are tough to diagnose with limited information because of all the variables involved. Things like low fuel pressure, or a large vacuum leak could cause a concern similar to what you are describing....

Q: gears not shifting

Hello! Being that it would not shift gears at all it could be an issue within the shift linkages. If the transmission was just serviced and you are experiencing transmission issues so soon after, I would take it back to...

Q: What tools are needed to remove the exterior door handle?

Hello. If you have successfully removed the interior door panel, then you are off to a good start. The only tools that should be required to replace the exterior door handle are a set of screwdrivers and a regular socket...

Related articles

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...