Code Definition

P043E — Evaporative emission system leak detection reference orifice low flow

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

About P043E

P043E 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 P043E 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.

Because P043E 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 low flow through the evapourative emission system's leak detection reference orifice. The ECM monitors the flow through the reference orifice to ensure the evapourative emission control system is functioning correctly. Low flow through the reference orifice may indicate a blockage or a malfunction in the evapourative emission system, affecting its ability to manage fuel vapour effectively.

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