Powertrain
generic / SAE
P24CB
Reductant Tank Cap Switch Circuit
A general circuit fault on the AdBlue tank cap switch - reports whether the cap is properly closed.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / CB
Possible causes
- Open in switch or wiring high
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)
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 40–200 €
- Estimated time: 0.3–1 h
- Component: reductant tank cap switch
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012