Reductant Injection Valve Performance
The SCR reductant injection valve does not deliver the commanded amount of reagent. Causes include clogging by urea crystals, electrical faults or incorrect spray pattern.
Affected components
- Def dosing valve
- Def pump
Common causes
- High likelihood: Urea crystals in dosing valve
- Medium likelihood: Electrical fault in dosing valve
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
- Reduced-power or limp mode may occur
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.