What are the common causes of P043E?

A clogged EVAP reference orifice. A blocked EVAP vent or purge path. A failed canister vent valve. A pinched EVAP hose. A weak EVAP leak detection pump.

Inspect and clean the reference orifice. Check the vent and purge valves for sticking. Check the EVAP hoses for kinks or pinching. Test the leak detection pump output. Remove the orifice restriction or replace the failed valve. Clear the code and retest.

P043E

EVAP System Leak Detection Reference Orifice Low Flow

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P043E means EVAP System Leak Detection Reference Orifice Low Flow.

Check these first

A clogged EVAP reference orifice
A blocked EVAP vent or purge path
A failed canister vent valve
A pinched EVAP hose
A weak EVAP leak detection pump

What to do next

Inspect and clean the reference orifice
Check the vent and purge valves for sticking
Check the EVAP hoses for kinks or pinching
Test the leak detection pump output
Remove the orifice restriction or replace the failed valve
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.