P2401 — EVAP System Leak Detection Pump Control Circuit Low

What Does P2401 Mean?

P2401 is a diagnostic trouble code indicating: EVAP System Leak Detection Pump Control Circuit Low. The ECM detected the control circuit voltage for the EVAP leak detection pump is below the expected range. This code has been reported in NHTSA complaints across 2 different vehicle models, most commonly on Toyota Corolla.

Symptoms of P2401

⚠️ Check Engine Light (MIL) illuminated
⚠️ Possible fuel smell from engine bay
⚠️ EVAP system related codes stored alongside (P043E, P043F, P2402, P2419)
⚠️ Possible failed emissions test

Common Causes

🔍 Failed or stuck EVAP leak detection pump
🔍 Open circuit or broken wiring to EVAP leak detection pump
🔍 Corroded connector at EVAP pump
🔍 Failed ECM/PCM (rare)

P2401 Reports by Year

2021

2

2023

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"STARTED CAR THIS MORNING AND THE CHECK ENGINE LIGHT CAME ON. TOOK TO PARTS STORE AND HOOKED IT UP TO THE COMPUTER AND FOUND CODES (P2401, P043E, P043F, P2402, P2419) EVERYTHING I HAVE RESEARCHED COMES BACK TO EVAP CANISTER FAILURE, AND POSSIBLE WIRING FAILURE."
— Toyota Corolla owner, 01/08/2021

"Known well issues, faulty tank getting water to canister."
— Toyota Corolla owner, 07/10/2023

"Recurring Problems with AWD Malfunction, Engine Light On. AWD System Malfunction/2WD Mode Engaged and the Engine Light came on."
— Toyota Rav4 owner, 05/31/2021

Source: NHTSA Complaints Database

Most Reported Vehicles for P2401

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	TOYOTA COROLLA
2	TOYOTA RAV4

P2401 Reports by Vehicle

Detailed NHTSA complaint analysis for each vehicle model.

TOYOTA COROLLA

2 NHTSA reports · Peak: 2007, 2009

Frequently Asked Questions

What does P2401 mean?

P2401 means the ECM detected a low voltage condition on the EVAP leak detection pump control circuit. It usually points to a faulty pump, broken wiring, or corroded connector.

Is P2401 serious?

It will not leave you stranded but it will cause an emissions failure and keep the Check Engine Light on. Fix it before your next inspection.

Can I drive with P2401?

Yes, short term. The vehicle runs normally but emissions are uncontrolled. Address it within a few weeks.

What vehicles commonly get P2401?

Toyota Corolla and RAV4 are the most commonly reported models per NHTSA complaints. VW and other makes can also trigger this code.

What To Do Next

Possible Fixes

🔧 Inspect EVAP leak detection pump wiring harness for breaks, chafing, or corrosion
🔧 Test EVAP leak detection pump with a multimeter — replace if resistance is out of spec
🔧 Clean and reseat EVAP pump connector; apply dielectric grease
🔧 If wiring and pump check out, inspect ECM for fault; update or replace if needed

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2401: EVAP System Leak Detection Pump Control Circuit Low