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Why does tighten fuel cap light come on after I changed the cap and cleared the engine light code

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  • Chevrolet Master
  • 6,826 Answers

Could have a leaky gas tank clamp for the filler neck.

Posted on Jul 05, 2010

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6ya6ya
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Posted on Jan 02, 2017

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Hightower971
  • 183 Answers

SOURCE: The "tighten fuel cap" message

It's the gas cap sensor. Or you are getting a vaccuum leak somewhere.

Posted on Apr 24, 2009

inhisname
  • 76 Answers

SOURCE: engine light on tighten fuel cap

you can try testing the vacuum purge solenoid, remove both lines and plug them, rescan ecm at 2000 rpm. if you have an interactive scanner, try to purge the solenoid manualy and watch for pressure drop! do you have acess to a smoke machine? good luck, marty

Posted on Jun 07, 2009

  • 518 Answers

SOURCE: I have 2004 Silverado error code P0455 emission

Large evap leak, most likely evap vent valve or broken,rotted or squished lines from fuelpump to canister or valve. Look for obvious bad lines if not very common for valve to go bad.

Posted on Jun 09, 2010

czaa
  • 4536 Answers

SOURCE: engine light was coming on

try disconnectin batt cables and touch them both together--if no relief then theres something complex--put a tech ll that runs a data stream for the solution--some caps are sensitive so replacin with and original may work

Posted on May 13, 2011

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2 Answers

I would like to know what the code PO455 on a 2007 Mitsubishi Endeavor means.


Possible causes
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
help.jpg What does this mean? Tech notes
The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.
help.jpg What does this mean? When is the code detected?
Evaporative Emission System (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0455 Mitsubishi Description
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

Read more: http://engine-codes.com/p0455_mitsubishi.html#ixzz3NlVyARyX

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Dec 30, 2014 | Cars & Trucks

1 Answer

Codes p0141,0134,0135,0300


Thw first 3 codes indicate 02 sensor problems, so on that change those sensors and that should clear that up, the 0300 is and engine misfire, I suggest changing at least the cap and rotor and maybe even the wires as damage may have occured, its simple, relatively cheap and shoudl get you on your way.

Dec 27, 2014 | Cars & Trucks

1 Answer

Computer code 455


Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

When is the code detected? EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors P0455 Buick Description This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
if tightening the cap or replacing the cap does not help take your car to a shop to have it diagnosed as it requires special tools/equipment to test this and get an accurate results to find what needs replacing.

Oct 10, 2014 | 2004 Buick LeSabre

1 Answer

Code P0455


Ford error code P0455
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.
http://engine-codes.com/p0455_ford.html
http://www.stangnet.com/images/stories/docs/sn95_TSBs/03-20-03.pdf

Sep 08, 2014 | 1998 Ford Ranger

1 Answer

My check engine and check fuel cap light keep coming on after i changed the gas cap twice and reset the light it came back on what could this be. I drive a 06 lincoln navigator


You need to diagnose any codes you get
& smoke test the evap system, to find a
problem

Seldom does throwing on parts with a name similar
to a code work

Codes have nothing to do with installing parts

Clearing codes, clears all data needed to diagnose
the failed system & the evap system only runs every few
days,so you done as far as codes helping

Mar 22, 2014 | 2006 Lincoln Navigator

1 Answer

The engine light came on and it said "service engine soon". I called On-star and they said to drive it seven more times. They said the diagnostic code was P0442. I looked it up and it said possible


I don't know the age of your car, but it is likely the O ring on the gas cap is leaking, not allowing the fuel system to work properly. If you forgot to put on the gas cap or did not tighten it, after seven runs, the check engine light should clear. If it does not, then the easiest solution is to buy a new gas cap from the dealer. It will be about $25 - $30, and you can install it yourself. After installing the new cap, and seven trips later, IF the gas cap was the problem, the light should clear.

I have tried to replace the O ring on a cap before, but found it nearly impossible. Another trick would is to lightly coat the O ring with vasoline - then seven trips to see if that clears the light. This is only a temporary solution, but it may tell you if the problem is the gas cap. Godd luck!

Nov 27, 2012 | 2005 Cadillac Deville

1 Answer

Check engine with error codes P1111 and P0455


The Code 455 is showing the large leak in the Evaporative system (gascap) and the Code 1111 shows there are no defects.

You can get these codes wiped off with a scanner free at Autozone, Oreilys, or Advance. They may clear by themselves after 35 startups.

It would just appear to be a latent record of the old condition before and after you tightened the gascap.

Aug 29, 2012 | 2003 Jaguar Xkr

1 Answer

Check Engine light issues


change the evap sensor the location of the sensor should be on a sticker schematic under your hood

Aug 27, 2012 | Cars & Trucks

2 Answers

Engine light on tighten fuel cap


If the cap is tight then it will have to be diagnosed further. If the cap was loose then tighten it and clear the codes.It will go off on it's own but it will take a while

Jun 07, 2009 | 2004 Chevrolet Tahoe

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