Code Definition

P1447 — EVAP Purge Flow Monitor

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

About P1447

P1447 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.

When P1447 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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.

P1447 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

The EVAP purge flow monitor on Nissan vehicles is a self check in which the Engine Control Module (ECM) opens the purge volume control valve and watches for evidence that fuel vapour is actually flowing from the charcoal canister into the intake. Purge flow is normally confirmed through changes in fuel trim or intake pressure when purge is commanded. DTC P1447 sets when the ECM commands purge but does not detect the expected flow, indicating a restriction or fault in the purge path. Symptoms are usually limited to the check engine light, though a saturated canister could cause a fuel odour or ...

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