# Faulty gas cap?

**URL:** <https://community.cartalk.com/t/faulty-gas-cap/14305>\
**Category:** Maintenance/Repairs\
**Created:** [May 22, 2008, 12:46am UTC](https://community.cartalk.com/t/faulty-gas-cap/14305 "2008-05-22T00:46:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dodge\_racer16](https://avatars.discourse-cdn.com/v4/letter/d/cab0a1/32.png) [@dodge\_racer16](https://community.cartalk.com/u/dodge_racer16)\
**Post date:** [May 22, 2008, 12:46am UTC](https://community.cartalk.com/t/faulty-gas-cap/14305/1 "2008-05-22T00:46:13Z")

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I just bought a 1998 Jeep Cherokee sport with the I6 4.0L engine. 5-speed manual transmission. The day I bought the vehicle, there was no check engine light on or anything but 2 days after I got it the check engine light came on when I started the vehicle in the morning. Got out my scan tool and got it to read P0443. Had to do with evaporative, cant remember the whole thing. Anyway, i thought maybe it was the gas cap since I had just put gas in the night before so I took the cap off and tightened it back up, letting it click a good 5-8 times. Cleared the codes, let the vehicle run for a few minutes to be sure it wasnt going to come back on, shut it off for a minute, turned it back on and the light came back on and has been on ever since. I really cant seem to find any vacuum leaks anywhere or hear any that may be leaking. Do you think it would be a smart choice to buy a new gas cap to see if it takes care of the problem or is there something else I should consider doing? And before someone says to try tightening it again to see what happens, I have done it several times just to be sure. Thanks in advance!

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**Author:** ![crankwalk5](https://avatars.discourse-cdn.com/v4/letter/c/3e96dc/32.png) [@crankwalk5](https://community.cartalk.com/u/crankwalk5)\
**Post date:** [May 22, 2008, 12:52am UTC](https://community.cartalk.com/t/faulty-gas-cap/14305/2 "2008-05-22T00:52:23Z")

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thats a purge code. fuel cap has zero to do with that

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [May 22, 2008, 3:57am UTC](https://community.cartalk.com/t/faulty-gas-cap/14305/3 "2008-05-22T03:57:48Z")

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The code P0443 is, “Evaporative emissions system purge control valve circuit”. Click on this link for info on the evaporative canister purge solenoid: [http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a9ba2](http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a9ba2) Scroll down about three “pages”.  
Your public library probably has a subscription to [www.alldata.com](http://www.alldata.com). You can go to that Website and get the troubleshooting charts for that DTC code. You’ll need to use a multimeter, too, and the wiring diagrams.