P2403EVAP System Leak Detection Pump Sense Circuit/Open
- 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
- The sense circuit carries the feedback by which the engine computer knows what the leak detection pump is actually doing. P2403 is logged when that feedback is missing as if the line were open. The January 2014 Golf book from VW sets it once the sense signal stays at a low voltage for more than 0.5 s. Jaguar's bulletin JTB00436 for the XJ (X351, 2010 onwards) lists P2403 among the DMTL codes caused by road spray freezing or collecting in the pump filter, and Ford's code list for the 2014 Boss 302S carries the same title. Compared with P2400 the pump may run normally; only its feedback is lost. P2405/P2406 are the low/high siblings, P2404 the plausibility check. The tank leak test cannot be evaluated; drivability is not affected.
- What you may notice
- Check engine light
- EVAP monitor not completed
- More often after winter driving or car washes
- Likely causes
- LikelyBroken feedback wire or backed-out terminal at the pump connector
- PossibleWater or ice trapped in the pump or its filter (Jaguar XJ)
- PossibleFailed feedback element inside the pump
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.