OBD-II code · Powertrain (generic, extended)
P2406 EVAP System Leak Detection Pump Sense Circuit High
Same as P2403 with the sense voltage above the plausible range. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
Is it safe to drive with P2406?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySense line shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- P2403EVAP System Leak Detection Pump Sense Circuit Open
- P2404EVAP Leak Detection Pump Sense Circuit Range/Performance
- P2405EVAP System Leak Detection Pump Sense Circuit Low
- P2407EVAP Leak Detection Pump Sense Circuit Range/Performance
- P2408Fuel Cap Sensor/Switch Circuit Range/Performance
- P2409Fuel Cap Sensor or Switch Circuit Range or Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.