P2404 code meaning
EVAP System Leak Detection Pump Sense Circuit Range/Performance
Powertrain system Generic code P24xx codes Check engine light
What P2404 means
P2404 is a plausibility code: the pump feedback is electrically present but does not behave as the leak test expects. VW's 2014 Golf data book sets it when the sense signal stays high for more than 30.4 s (12 s on another engine) over 30 checks, or when high signal time during pumping adds up to more than 10 s. Subaru has issued a series of bulletins since 2023 (09-102-23 to 09-131-25, many models) because condensation in the ELCM can trigger P2404 falsely; the fix is a leak test, a 35-minute ELCM pump active test and new ECM software. For the 2011-2014 Touareg 3.6, VW linked P2404 to coolant in the pump's vacuum line, and Land Rover lists P2404 with failure types 29 and 2F. P2403 covers a dead feedback, P2407 an unstable one.
P2404 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2404
- Check engine light, often returning after clearing
- EVAP readiness not set
Common causes of P2404
- Most likelyCondensation inside the leak check module (Subaru ELCM, software update available)
- PossibleWorn or sticking pump that no longer reaches its expected state in time
- Less likelyCoolant or debris in the pump's vacuum or vent line
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP leak detection pumpEVAP pump wiring
What each part of P2404 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 04 | The exact fault in that area. |
What to do next
- Note P2404 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2404
What does P2404 mean?
P2404 means "EVAP System Leak Detection Pump Sense Circuit Range/Performance". P2404 is a plausibility code: the pump feedback is electrically present but does not behave as the leak test expects. It is a generic code, so it means the same on every make.
Is it safe to drive with P2404?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2404 fail an emissions test?
Yes, it can. P2404 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2404 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2404 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.