Code Definition

P1456 — Evaporative Emission canister small leak

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Nissan

About P1456

P1456 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1456 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC P1456 on Nissan vehicles indicates the Engine Control Module (ECM) detected a small leak on the canister or fuel tank side of the evaporative emission (EVAP) system during its leak diagnostic. The EVAP system seals the fuel tank and canister and must hold the small pressure or vacuum used for the test, so any minor leak in this area will set the code. Likely sources include the canister, the fuel tank seals, vent lines, and related hoses and connections. The driver typically notices only the check engine light, although a faint fuel odour may sometimes be present.

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