Small evap leak on 2004 jeep grand cherokee

For the P0155 code, check the fuse for the O2 heater circuit.
The P1494 has to do with the EVAP leak detection pump pressure switch. Or the switch is faulty, or there is a large leak. Do you hear any hissing sounds under the jeep?

codse p0456 refers to evaporative emission system-- very small leak detected.. probable causes -----mechanical fault---hose connections loose---EVAP pressure sensor.. I would look at the EVAP sensor as being faulty

Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:

• A small leak in any of the EVAP hoses or fuel tank hoses
• A small leak in the purge valve or vent valve
• The EVAP Canister may be leaking

open hood and ck for broken vacuum hoses going to the purge valve(2 vacuum ports and a wiring connector)
on the drivers side between airbox and firewall
if good remove driver side rear tire and inspect hoses next to the gas tank and 3rd, the canister is in that wheel well also insp for cracked hoses there also, been working for jeep 12 years i charged people about 1 hour to correct this probem.

That code definition is (evaporative system small leak detected). One of the most common reasons for this code is a faulty gas cap. The evap system is strictly designed to trap fuel vapors in the tank and not allow them to scape into the atmosphere. The vehicle keeps a constant vacume on the tank and when it is unable to hold that pressure it will set the code you have. Try buying a new gas cap-thats a cheap start-clear the code and see what happens. If the light comes back on you will have to bring it to a repair shop where they will tap into the Evap system and force smoke into it. They will then observe the Evap hoses and wherever it leaks smoke will be your problem.

EVAP Emission Control System Leak Very Small - check your fuel cap, if left loose or taken off while still running that code will appear

What is the exact code?
The evap canister captures and burns fumes coming from the gastank.
If it is saturated with fuel 9from topping off) it can lead to vapor lock.
Please reply with the code number ( ex P01142 )

Thanks

how about the filler neck. just had to replace mine and now its fine

use carb cleaner and waft all vacuum lines and areas near evap can and when engine rpm changes you are close ...:) good luck

The evap leak is short for EVARORATIVE EMISSIONS SYSTEM, NOT AC EVAPORATOR, AC leaks do not cause the truck to fail emission, most likely the problem is a defective gas cap. Also the code you give (P0244) is a watse gate code, please provide the correct code.


P0244
Turbo/Super Charger Wastegate Solenoid A Range/Performance