P2403 code meaning
EVAP System Leak Detection Pump Sense Circuit/Open
Powertrain system Generic code P24xx codes Check engine light
What P2403 means
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.
P2403 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P2403
- Check engine light
- EVAP monitor not completed
- More often after winter driving or car washes
Common causes of P2403
- Most 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
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 P2403 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). |
| 03 | The exact fault in that area. |
What to do next
- Note P2403 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 P2403
What does P2403 mean?
P2403 means "EVAP System Leak Detection Pump Sense Circuit/Open". The sense circuit carries the feedback by which the engine computer knows what the leak detection pump is actually doing. It is a generic code, so it means the same on every make.
Is it safe to drive with P2403?
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 P2403 fail an emissions test?
Yes, it can. P2403 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 P2403 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2403 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.