Jeep Grand Cherokee P0456 Causes. There are many potential causes of code P0456. Loose or damaged gas cap. Leaking or disconnected EVAP hose. Faulty purge volume control valve. Faulty canister vent control valve. Charcoal canister leak. Leaking fuel tank. P0456 is one of the top 5 trouble codes for the Jeep Grand Cherokee. The Jeep Grand Cherokee has a Selec-Trac system that allows the driver to choose between two or four-wheel drive. This system is designed to give the driver more control over the vehicle, and it can be useful in different types of terrain. Jeep Grand Cherokee Capless Gas Tank Problems; Jeep 4.0 Oil Pressure Problems [Reasons & Solutions The 2014 Jeep Grand Cherokee has 3 problems reported for weak plastic filler neck snaps off when filling with fuel. Average repair cost is $600 at 69,850 miles. Capless gas cap cracked and it comes right off housing. I screw it back in and drive on, probably safety issue. Can cap be replaced? Dealer trip in am. They can only order entire capless filler assembly. $450 part w/install. That said, using quality fuel all the time should prevent most fuel system problems. Aaron My Jeep: 2001 Grand Cherokee Limited, 245/65R17 Falken Rocky Mountain ATS, K&N drop in air filter, Bilstein HD's. Hold the pump nozzle up a bit instead of resting it completely in the filler tube and fill slower as you near a full tank. Also you don't want to keep clicking the nozzle in an attempt to fill completely to the top of the filler neck. I'm told overfilling can cause problems with the vapor recovery system in the vehicle. Experts say that this is because smaller vehicles usually have shorter fuel pipes leading to their gas tanks. If the fuel splashes back up from the tank, there is a better chance that it will reach the nozzle if the fuel pipe is short. This problem may require owners of small cars to take measures to prevent the fuel nozzle from shutting off. j3PK2rK.

jeep grand cherokee capless gas tank problems