OBD-II code · Powertrain (generic, extended)
P24DD Reductant Purge Control Valve B Circuit Low
Same as P24DB with the control line shorted to ground. 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 P24DD?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
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
- Reductant Purge Valve B
Related codes
- P20A2Reductant Purge Control Valve A Circuit Low
- P24DAParticulate Matter Sensor Exhaust Sample Error Bank 1
- P24DBReductant Purge Control Valve B Circuit Open
- P24DCReductant Purge Control Valve B Performance
- P24DEReductant Purge Control Valve B Circuit High
- P24DFReductant Purge Control Valve B Stuck Open
- P24E0Reductant Purge Control Valve B Stuck Closed
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.