P0456 on the 2017 Mazda Mazda3
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 01-005-19-3548 | 2019-02-19. Service bulletin. Some vehicles may exhibit the check engine light on with DTC P0456 stored in the PCM memory. P0456: EVAP system leak detected (very small leak). The concern is most likely the result of the customer not getting the fuel cap completely closed after fueling the vehicle. This causes a small fuel vapor leak and turns DTC P0456 on. |
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| SA-030-18 | 2018-08-20. Service bulletin. Some customer may complain about the CHECK ENGINE light ON while driving. When diagnosed, it is found that the PCM has stored DTC P0456 for evaporative gas leakage (extremely low). This may be caused by leakage detected from the catch tank unit (1) at the purge valve (2). |
| 01-013-18-3478 | 2018-07-02. Service bulletin. Some vehicles may exhibit the check engine light on with DTC P0456 stored in the PCM memory. P0456: EVAP system leak detected (very small leak)The concern is most likely the result of the customer not getting the fuel cap completely closed after fuelingthe vehicle. This causes a small fuel vapor leak and turns DTC P0456 on. |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.