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Ron Z.
Ron Z., - Jeep Tech -
Category: Jeep
Satisfied Customers: 17782
Experience:  18+yrs experience. State Inspector & Jeep Diagnostics/Repair
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Gascap appeared today where the mileage is usually

Customer Question

Gascap appeared today where the mileage is usually displayed.
JA: Sometimes things that you think will be really complicated end up being easy to fix with Jeep. The Jeep Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: First the check engine light came on last week. I had that checked out was the gas cap. It was loose. Removed the check engine icon two days ago and this morning the word gascap appeared where mirage is usually displayed. Thought maybe I better get a new gas cap.
JA: Diagnosing the correct check engine code is the key to getting a quick fix. How many miles are on the car?
Customer: 72000
JA: Are you hoping to fix this yourself?
Customer: I was hoping to just get a new cap
JA: Is there anything else the Jeep Mechanic should be aware of about your Jeep?
Customer: No, runs great.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.
Submitted: 4 months ago.
Category: Jeep
Expert:  Ron Z. replied 4 months ago.

From what you are describing here, it does sound like the gas cap will need to be replaced. When the Check Engine Light comes on and points to a "leak in the EVAP System" then followed by a "Gas cap" message, very commonly this is a faulty gas cap. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those "universal" or "locking" fuel caps sold at after market parts stores do not meet OE specs, and will not seal the system correctly. If the Gas Cap message returns, and with a Check Engine Light soon there after, then the problem will be somewhere else in the EVAP (emissions control/recovery) System. The system will need to be "smoked". This is where a machine forces smoke through the system and any leaks can then easily be found. If the smoke test shows no leaks, then EVAP System components will need to be tested based on the "p-code" that is present. When/If the Check Engine Light returns , you can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc). If you found this answer helpful, please help me and leave a rating using the "stars" at the top of the page or click 'accept'.
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