P2404EVAP System Leak Detection Pump Sense Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light, often returning after clearing
- EVAP readiness not set
- Likely causes
- LikelyCondensation inside the leak check module (Subaru ELCM, software update available)
- PossibleWorn or sticking pump that no longer reaches its expected state in time
- RareCoolant or debris in the pump's vacuum or vent line
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.