P043e Code: Evaporative Emission System Leak Detection Reference Orifice Low Flow

Many modern vehicles are equipped with an evaporative emission system (EVAP). The function of this system is to trap and purge smog-forming fuel vapors to prevent them from polluting the atmosphere.

The powertrain control module (PCM) is usually altered once there’s a fault or leak within this system. P043e is one of the trouble codes related to the EVAP system.

What Does the P043e Code Mean?

Diagnostic trouble code (DTC) P043e stands for “Evaporative Emission System Leak Detection Reference Orifice Low Flow.”

The EVAP system uses a vapor canister to trap excessive fuel vapors until the engine is in a suitable condition to burn them. The vapor canister is the EVAP system’s focal point.

The canister keeps the fuel vapors from the gas tank when the engine is turned off. The canister contains activated charcoal, which traps the vapors until the engine starts and the conditions for a vapor purge are met.

Some EVAP systems use an electronic leak detection pump to generate pressure within the system so that leaks/flow can be tested.

The leak detection pump usually has a reference orifice tube. This tube inhibits airflow to create a pressure difference in the EVAP system. The PCM will set code P043e if the orifice tube becomes clogged with debris.

Note: The definition of code P043e might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P043e Code?

• Damaged or clogged leak detection orifice inside the detection pump
• Circuit issues, such as damaged wires or poor connections
• An issue with the ECM, such as software in need of an update

What are the Common Symptoms of the P043e Code?

• Illuminated check engine light
• Slightly diminished fuel efficiency

How to Diagnose the P043e Code

DTC P043e can be logged in various vehicles. However, this doesn’t mean that there’s a universal solution that’ll work for all makes and models.

 If you’re not that well-versed with auto repair, it might be best to call your mechanic to help you out.  However, if you’re confident with your knowledge in auto repair, then you can go ahead and do it yourself.

How to Fix the P043e Code

Fixing any trouble code can be hard if you’re not a certified mechanic. So it’s usually best to take your vehicle to the nearest auto repair shop if you don’t have the repair skills to get it done.

But if you’re equipped with the right tools and auto repair know-how, you can go ahead and address the problem on your own. However, keep in mind that vehicles can be structured differently per manufacturer. For example, repair steps for a P043e in a Toyota might not work for other vehicles.

So make sure to read up on repair steps that are specific to your make and model. Checking out guides from Chilton or getting an ALLDATA subscription helps.

Get an Orifice Tube Service Kit Without Leaving Your Home

If there’s a clog in the reference orifice tube, the PCM may set P043e code. A clog is likely also what’s causing your engine to use up more fuel than usual. Servicing the damaged orifice tube with an orifice tube service kit should help resolve the fuel issue and save you some money in the process. You can purchase a kit at CarParts.com.

Our goal at CarParts.com is to make ordering online quick and easy. You can browse our catalog from the comforts of home and order what you need conveniently. It only takes a few quick clicks to add things to your cart. After that, you can enjoy the convenience of our secure checkout. We’ll ship any new parts you order straight to your door in as fast as two business days.

Resolve the P043e code in your vehicle and bring your vehicle’s fuel efficiency back to what it once was. Order an orifice tube service kit now at CarParts.com.