When the engine code P2401 is displayed, it means there’s a leak in your Evaporative Emission (EVAP) system. While your car will still run normally, a faulty EVAP system may release harmful vapors into the atmosphere, and it can certainly prevent you from passing an emissions test.

Since EVAP issues and several overlapping engine codes can fly under the radar, it’s helpful to understand what diagnostic trouble codes (DTCs) mean, especially if you own an OBD-II reader.

Understanding your car's OBD codes

can prepare you to address and resolve them as quickly and safely as possible.

The

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connoisseurs at

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have gathered up all the details on DTCs to arm you with the knowledge you need to keep your car running smoothly. They’ve got the inside scoop on engine code P2401, including what it’s all about and how to get it under control.

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What does the engine code P2401 mean?

Definition: There’s a fault detected in the EVAP leak detection pump

Engine code P2401 is triggered when the Engine Control Module (ECM) detects a leak in the detection pump within the

EVAP control circuit

. The EVAP system is the anchor that regulates system pressure and gas flow in the engine.

When the EVAP system is functioning properly, it ventilates the fuel tank and wards off any harmful gas emissions from being released into the atmosphere.

How much will it cost to fix?

To get the EVAP system back on track, it’ll cost between $75 and $150 depending on the type of vehicle you own, where you’re located, and the rate your specific mechanic will charge.

MORE:

Basic car maintenance schedule

What can cause the P2401 engine code?

With the P2401 engine code triggered, all roads lead back to the EVAP system, but here are some other potential causes:

Failed leak detection pump

Leaking vapor lines

Malfunctioning ECM

Shorted or open wiring harness

Faulty electrical connection

Gas cap

issue

Failed charcoal canister

Common symptoms of the P2401 engine code

Since the P2401 engine code can be a stealthy one, you may only notice an issue when your

Check Engine Light is on

. A less prominent indicator can be a subtle fuel smell.

How serious is the P2401 engine code?

Even with the P2401 engine code in full force, you may not sense an issue in terms of how well your car is driving and running. However, an EVAP system failure can stop you from passing an emissions test, all while emitting harmful vapors into the environment.

Since the symptoms can be subtle, it’s even more of a reason to pay close attention to the engine code and get a jumpstart on resolving the issue.

MORE:

How can I reduce the costs of car maintenance?

Can I fix the P2401 engine code myself?

Technically, you can assess your engine by popping up the hood and inspecting the harness and connectors for any visible damage. Warning signs can present as broken or bent connector pins.

This is a complex code to diagnose, though, so it’s recommended to have the trained eye of a technician to evaluate your EVAP system.

This is what an experienced professional will do:

Scan the ECM with a tool for existing codes

Take note of codes displayed in the freeze frame data

Reset all codes

Test drive the vehicle set with the codes shown in the freeze frame data

Visually inspect the EVAP system for damage

Perform testing on the gas cap

Deploy a smoke machine to illuminate EVAP system leaks

Test the ECM when all other issues are ruled out

Repairing parts to fix the P2401 engine code

Once all components are assessed and the source of the issue is identified, the technician will perform any one or more of these actions to restore the EVAP system:

Replace the gas cap

Replace damaged vapor lines

Replace or repair the wiring harness

Replace the leak detection pump

Restore the purge control solenoid

Replace the ECM

MORE:

What does the check engine light mean?

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