Reductant Level Too Low
The DEF tank level has dropped below the warning threshold — driver action required to refill before the inducement strategy escalates to limp mode or no-restart.
Affected components
- Reductant tank
- Reductant level sensor
Common causes
- High likelihood: DEF tank simply empty — refill needed
- Low likelihood: Level sensor under-reading
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
- A drive cycle may be required after repair
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.