Code Definition

P043F — Evaporative emission system leak detection reference orifice high flow

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P043F

P043F is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P043F is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a signal or supply voltage higher 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.

Because P043F is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This fault code is set when the engine control module (ECM) detects a high flow through the evapourative emission system's leak detection reference orifice. This condition can indicate an issue with the evapourative emission (EVAP) control system, specifically relating to how it manages fuel vapours. High flow through the reference orifice suggests there might be a leak or malfunction in the EVAP system, causing more air or vapour to pass through the orifice than is normal.

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