Reductant Tank Cap Switch Circuit
A general circuit fault on the AdBlue tank cap switch - reports whether the cap is properly closed.
Affected components
- Reductant tank cap switch
Common causes
- High likelihood: Open in switch or wiring
Possible 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)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.