I have a 2014 Summit with 62,000 miles, and the check engine light came on yesterday. The code is P0456 - EVAP system (very small leak). The guy at O’Reilly’s gave me a printout with possible causes. The most common (and cheapest) cause is the gas cap, but my tank is capless. Has anyone else had this issue?
The door to the filler neck has always been slightly open, and I’m wondering if that could be the problem. It seems like getting a smoke test at a mechanic is the best way to know for sure, but with the holidays, it might be a while before I can do that.
I don’t want to jinx you, but our 2014 had the same code since it was a month old. They replaced 2 sensors, the fuel filler neck, and the fuel tank but still couldn’t find a leak, even with a smoke test. After about a year of dealing with it, I finally got them to replace our Jeep, and the new one should be here in a couple of weeks. Our light would come on every week and a half or so. Small leaks in the EVAP system can be tough to find. It would be nice if they could use a dye like they do in A/C testing, but I’m not sure if something like that exists. Hopefully, they can fix it for you!
My 2014 Summit has the same problem with the same code. No one can find the issue. I’ve had the light turned off 3 times, but it keeps coming back on. The biggest problem is that when the check engine light is on, you can’t use the remote start to cool or heat the car before getting in. It’s a huge pain, and that light is so annoying! Help!
I have the same issue with the P0456 code (EVAP system, very small leak) on my '14 JGC Overland 5.7L. The problem seems to come from the capless gas tank. Here’s what’s going on:
I live in Oregon, where we’re not allowed to pump our own gas except in certain rural areas and after 6 p.m. A gas station attendant broke off the silver plastic/metal piece on the neck of the gas tank filler. They didn’t tell me and just threw it away. I usually go to only two gas stations, and I’m pretty sure which one did it.
This isn’t a huge problem in itself because you can just insert the gas nozzle upside down to fill the tank. It’s easier than spending $600 to replace the whole filler neck assembly.
However, many attendants ignore my advice and keep jamming the nozzle in, which has now caused the plastic neck piece to separate from the rubber part of the internal fuel door assembly. I think this is what’s causing the check engine light and the code because the piece was lost around 6 months ago, and the CEL came on 2 days ago.
I need a fix for this that doesn’t cost $600 in the next two weeks. I have to renew my car registration, but the state DEQ won’t pass a car with a check engine light on. I’ve tried the WD-40 trick, but it didn’t work. I’m even considering duct tape as a temporary fix just to pass the test. Any thoughts?
My new 2018 Jeep Grand Cherokee Overland had the check engine light come on. I took it to the dealer where I bought it. They acted like they had never seen this issue before. They kept my car for a week and wouldn’t tell me anything about this problem or what they were doing to fix it. So, I took my car back. They had cleared the warning light, and it hasn’t come back on for the past 3 or 4 days.
My main worry is this: if filling up with gas can crack the plastic seal at the filler neck, what would happen if there was a side-impact crash on the left rear corner? From what I’ve found online (on forums and the NTSB website), it seems Jeep has had problems with the fuel system since 1998. This feels like a serious fire hazard just waiting to happen.
My local mechanic did a smoke test and replaced the fuel filler neck, and just like that, it was fixed! It cost $200 (the dealership would have charged a lot more). It’s been over a year now with no issues. By the way, if your check engine light is on, the Jeep won’t remote start, which is a hassle.
2015 5.7L Overland with code P0456 (small EVAP leak), over 50,000 miles. First visit was in mid-November 2022: The dealer tightened the fuel filler assembly (though it’s unclear what exactly they did). The check engine light never went off. Second visit was in early December 2022: They did a smoke test and ordered a purge valve and hose assembly. The parts are expected in 5 weeks. I’ve driven a few thousand miles with the check engine light on. Very frustrating. The parts should arrive next week.
I’ve been getting this code, and it started right after the warranty ended. I could go in to see if MaxCare will cover it, but I’m waiting for something else to go wrong so I can get more value out of the deductible.
I consider this a minor issue that doesn’t seem to affect anything important. I have a $5 generic ELM327 Bluetooth OBDII module from eBay and use the Torque Lite app on my Android phone. I just clear the error when it shows up, and it doesn’t come back for 2 or 3 months.
By the way, if your check engine light is on, the Jeep won’t remote start, which is a hassle.