Code dictionary Generic OBD-II
P0456EVAP System Leak Detected (very small leak)
This is a definition, not a repair instruction. It does not identify a failed part or establish that a vehicle is safe to drive.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Separately researched
Vehicle-specific diagnosis
These guides address the exact vehicles and conditions in their sources. Select the guide that matches your vehicle.
Ford
Ford Escape/Fusion P1450 after refueling: match the purge-valve case
Separate a documented post-refueling start problem from a capless-inlet warning.
Jeep
2019 Jeep Renegade P0456: test for a leak before the software update
Understand the leak-test result, software status and capless filler on the 2019 Renegade 1.3L.
Dodge
2022 Dodge Challenger P0456 or P0455: choose the correct EVAP bulletin
Compare the EZH, EZC and ESG engine bulletins, understand the manual-transmission completion step, and separate a software case from a demonstrated leak.
Ram
2019 Ram 1500 eTorque P0128: check the revision and all three modules
Check the later bulletin, companion faults and PCM/HCP/TCM completion before approving an eTorque repair.
Jeep
2023 Jeep Grand Cherokee P0456: prove a filler-tube leak before replacement
Use the initial SLVT, weld-area finding and repeated leak test to evaluate a filler-tube estimate.
Nissan
2018 Nissan Rogue P0456: a loose cap or a real EVAP leak?
Separate the dashboard cap message, stored leak codes and a measured leak before replacing parts.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT