P2401 on Toyota
Evaporative Emission System Leak Detection Pump Control Circuit Low
P2401 on Toyota vehicles indicates evaporative emission system leak detection pump control circuit low. Au7o has documented this code across 2 Toyota models — most commonly on RAV4, Sienna. Generic OBD-II code indicating the PCM sensed voltage in the EVAP leak detection pump control circuit that is lower than expected (typically a short to ground or excessive resistance). The pump cannot pressurize the EVAP system to run its leak self-test. Typical repair costs on Toyota range from $150 to $500, depending on the specific model and root cause.
Common Causes of P2401
- •Short to ground in the leak detection pump control wiring
- •Failed leak detection pump
- •Corroded/damaged connector or chafed harness
- •PCM driver circuit fault
P2401 on Toyota by Model
Toyota RAV4(1 issue)
- 2006-2010 RAV4 Liquid Fuel in EVAP System - T-SB-0046-102006-2010
Toyota T-SB-0046-10 applies to specified 2006-2010 RAV4 production and addresses liquid fuel entering the EVAP system. The documented gates are an illuminated MIL with DTC P043E, P043F, P2401, P2402 and/or P2419, or an intermittent warm rough idle reproduced while commanding the purge VSV, followed by physical confirmation of fuel in the applicable EVAP vent hoses. It is not a general 2001-2012 charcoal-canister failure card and does not support the old P0440/P0441/P0442/P0446/P0455 mapping.
Toyota Sienna(1 issue)
- EVAP System Leak-Detection / Vapor Canister Fault (Check Engine Light, Hard Refueling)2011-2020
Third-generation Siennas commonly throw EVAP (evaporative emissions) faults as the system ages. Failure points include the canister vent solenoid/VSV sticking, the leak-detection pump and reference orifice, the purge valve, and a worn or loose gas cap. Beyond the check engine light and an emissions/smog failure, a stuck-closed vent can make the tank hard to refuel (pump clicks off repeatedly), while a stuck-open vent or cracked line can produce a fuel-vapor smell.
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View P2401 across all makes →Frequently Asked Questions
What does P2401 mean on Toyota?▼
P2401 stands for "Evaporative Emission System Leak Detection Pump Control Circuit Low." Generic OBD-II code indicating the PCM sensed voltage in the EVAP leak detection pump control circuit that is lower than expected (typically a short to ground or excessive resistance). The pump cannot pressurize the EVAP system to run its leak self-test. On Toyota specifically, this code is documented across 2 models.
What causes P2401 on Toyota vehicles?▼
Common causes on Toyota: Short to ground in the leak detection pump control wiring, Failed leak detection pump, Corroded/damaged connector or chafed harness, PCM driver circuit fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2401 on a Toyota?▼
Repair costs on Toyota range from $150 to $500, depending on the specific model and root cause.
Which Toyota models have P2401 documented?▼
Au7o has documented P2401 on 2 Toyota models: RAV4, Sienna.