P24E0Reductant Purge Control Valve B Stuck Closed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Stuck closed means purge valve B does not move into its emptying position when commanded after shut-down, so the line it serves stays filled with fluid under residual pressure. In normal dosing this goes unnoticed; the risk appears in frost, when the trapped DEF freezes in hose, pump or injector and can crack them. No manufacturer documents P24E0 publicly. How a blocked valve A is detected on GM's Duramax diesel: the pressure drop during the purge phase is measured, and less than 50 kPa sets P20A1, Type A. Pico's Denoxtronic 2.2 description shows that the purge relies on the reversing valve and the closed injector to create vacuum. CARB demands monitoring of SCR components. P24DF is the reverse failure.
- What you may notice
- Malfunction indicator lamp on
- Frozen or burst DEF line or injector after frost
- Likely causes
- LikelyValve B seized by crystallised DEF or corrosion
- PossibleWeak coil that no longer pulls the valve over
- RareIntermittent open in the control circuit during shut-down
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €300 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.