Question about GMC Yukon

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Engine light on-tighten gas cap info comesw up. I have replaced gas cap twice. tighten gas cap indicator still comes up. What would be the most likely cause.

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  • Anonymous Mar 26, 2014

    Doesn't tighten

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Reset your ecm by shuting car off with key on and disconnect positive battery terminal for about a min then replace. Turn key off then try starting.

Posted on Mar 20, 2011

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The vent solenoid is the first thing I would look at.

Please post a year, make, model, and engine size so I can assist you further,

Posted on Mar 20, 2011

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1 Answer

Why would my OBD or malfunction indicator light come on and stay on?


Check engine light comes on with faulty oxygen sensor, loose gas cap or faulty gas cap. sometimes with low octane fuel as well. fill up with high octane fuel, tighten down the cap and see if it helps.

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Check Gas Cap alarm comes on and engine light is on


You gas cap is not on tight enough to seal causing the Check Engine Light to come on. When you tighten your gas cap you need to tighten it until it clicks at least 5 times, if it is tight than the seal on the gas cap may be bad. Replace with a OEM GM gas cap or a quality replacement that meets OEM specs.

Jun 16, 2010 | 2004 Pontiac Grand Prix

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The check engine light comes on i have had it to the dealer twice and both times they said it was the gas cap i have to take it back again today 2004 hyundai xg350


It is quite common to find out that a trouble code for a gross evap leak was actually set by a loose gas cap. You should always be sure to tighten up the gas cap (usually until it clicks).

If you are sure that you are properly tightening the gas cap, and no one else has removed the cap to fuel the vehicle, then you might have a vacuum leak in evap system, but it will be no small vacuum leak, and it should be very noticable.

Apr 19, 2010 | 2004 Hyundai XG350

2 Answers

Check engine light came on. Code P1456.


Did you change the gas cap with a Honda gas cap? Tighten it at least three clicks?
Also, Honda recommends that you never top off the tank when getting gas (only go to the click-off of the pump; otherwise you can get back flow into the system that will cause the code).
Tightening or replacing the cap will not immediately cause the light to go off; it can take up to three days of driving for the light to reset.
To check if your readiness codes (emission system) are set, turn the ignition to ON (II), without starting the engine. The Malfunction Indicator Lamp will come on for 20 seconds. If it then goes off, the readiness codes are set. If it blinks 5 times, the readiness codes are not set.
You can, of course, try resetting your engine light to see if it will come back on (which it probably will). I believe the procedure is:
Turn off the engine.
Press and hold the Select/Reset knob (odometer) in the instrument panel, then turn the ignition switch to ON (II).
Hold the knob for approximately ten seconds until the indicator resets.

Hope this helps you.

Nov 17, 2009 | 2004 Honda Pilot

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P0455 Tighten gas cap, engine light


i had same problem purchase new gas cap only ten bucks at wal mart. If still have problem e vac leak

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Low Fuel Panel Indicator On


I know if your gas cap is leaking the low fuel light will come on but I never heard of the gas guage showing empty unless you have a float problem. The float is in the tank.

Jan 01, 2009 | 2002 Ford E350

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