What it means
The control module detected that reductant purge control valve B is stuck closed. The code does not establish the effects on a particular vehicle’s purge process.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Reductant purge control valve B helps clear AdBlue/DEF from the injector and lines during shutdown. P24E0 sets when the control module detects that valve B remains closed when the commanded operation calls for it to open; it does not by itself determine how the vehicle's purge process is affected.
Common causes
Most likely first.
- Valve stuck closed
- Carbon or debris buildup preventing free movement
- Component wear with age - mechanical play
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)
How to diagnose it
- Record freeze-frame data and check for related reductant or NOx codes to see when valve B was expected to operate.
- Inspect the valve B connector and wiring for loose contacts, corrosion, or damage that could prevent an opening command.
- Check the valve and accessible passages for debris or deposits that could bind it shut, following the manufacturer's procedure.
- Use a supported scan-tool actuator test, if available, to confirm whether valve B responds to an opening command.
- If power, wiring, and passages are sound, test valve B's actuator and movement against the manufacturer's specification.
Common fixes
- Secure the valve B connector and repair any damaged wiring.
- Remove contamination from the valve or passage if allowed by the manufacturer's procedure.
- Free a sticking valve B actuator if the unit is serviceable.
- Replace reductant purge control valve B if it remains closed during the specified test.
Can I keep driving?
The vehicle may remain driveable, but the valve may not carry out the required purge and emissions warnings or a no-start countdown can follow. Follow any countdown warning and arrange diagnosis without delay.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.