OBD-II code · Powertrain (generic, extended)
P24D7 EVAP System Pressure Sensor or Switch B Circuit Low
Same as P24D5 with the signal voltage below 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 P24D7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
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
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.4 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Pressure Sensor B
Related codes
- P24D4EGR Cooler Coolant Pump Feedback Circuit
- P24D5EVAP System Pressure Sensor or Switch B Circuit
- P24D6EVAP System Pressure Sensor or Switch B Circuit Range or Performance
- P24D8EVAP System Pressure Sensor or Switch B Circuit High
- P24D9EVAP System Pressure Sensor or Switch B Circuit Intermittent
- P24DAParticulate Matter Sensor Exhaust Sample Error Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.