First mechanic check of the codes showed gas cap which had come up as a message one time and upon checking the cap was not loose and as evap. The pressure inside your gas tank is thrown off kilter when the gas cap is off or not secured properly.

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Replace the cap and wait to see if the light comes back on.

Jeep patriot check engine light gas cap. Check your gas cap. If there is still a problem i would start with the simple and cheap solution get an oem gas cap. We also go trough troubleshooting and inst.

What year is your jeep. If it s the gas cap you will get a bell sound about 10 seconds after starting the car and then gas cap will scroll across the odometer in funky letters. If so simply tighten it.

Tighten the gas cap 7 clicks and it will stop. Visually expecting the gas cap may not reveal a failure in the seal. If you notice your check engine light turned on immediately after filling your tank pull over and check first to see if the cap is loose.

Inspect your gas cap for any visible problems. Mil mystery indicator light. You can either tighten the cap and wait for the system to reset itself when it determines the problem is fixed or you can use an obd ii code scanner to manually reset the system.

Repairsday immigranttools we finally solved the mystical jeep gas cap message and how to fix it once for all. One of the obscure causes for this light coming on could be that your gas cap has ceased to perform its duties. Clear the codes and try again.

The system will show gas cap when a small leak is detected and it may not have anything to do with the cap itself. If your gas cap is not properly attached you may see a check engine light or a loose cap warning light on the dash. If that doesn t do the trick then buy a replacement gas cap at an auto parts store.

Taking these two measures will save you the expense of running a diagnostic on your jeep. The best thing to do would be to pull the dtc data from the pcm and record it. If it still returns then i would check the evap canister and vacuum lines running to it under the bumper on the side of the fuel filler.

The mil or check engine light came on at exactly 39 000 miles on my 08 2wd patriot. Step 1 turn off your vehicle s engine. Jeep patriot general discussion.