OBD-II code · Powertrain (generic, extended)
P2403 EVAP System Leak Detection Pump Sense Circuit Open
The leak detection pump (LDP) - which actively pressurises the EVAP system to find leaks - has an open sense circuit. The ECU cannot read the pump status during the diagnostic cycle.
Is it safe to drive with P2403?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in pump or sense wiring
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Leak Detection Pump
Related codes
- P2400EVAP Leak Detection Pump Control Circuit Open
- P2401EVAP Leak Detection Pump Control Circuit Low
- P2402EVAP Leak Detection Pump Control Circuit High
- P2404EVAP Leak Detection Pump Sense Circuit Range/Performance
- P2405EVAP System Leak Detection Pump Sense Circuit Low
- P2406EVAP System Leak Detection Pump Sense Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.